core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations...

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ILLINOI S UNIVERSITY OF ILLINOIS AT URBANA-CHAMPAIGN PRODUCTION NOTE University of Illinois at Urbana-Champaign Library Large-scale Digitization Project, 2007.

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Page 1: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

ILLINOI SUNIVERSITY OF ILLINOIS AT URBANA-CHAMPAIGN

PRODUCTION NOTE

University of Illinois atUrbana-Champaign Library

Large-scale Digitization Project, 2007.

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ILLINOISNATURAL HISTORY

SURVEY

Illinois Waterfowl Surveys and Investigations

W-43-R(Sl)-40

Annual Performance Report

byStephen P. Havera

Illinois Natural History Survey, Havana

1 July 1991 through 30 June 1992

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SEGMENT PERFORMANCE REPORT - FY 1992Illinois Waterfowl Surveys and Investigations

Federal Aid in Wildlife RestorationW-43-R(S1) - 40

Study 101 LEAD POISONING INVESTIGATIONS

Job 101.1 Hunter Compliance with Nontoxic Shot Regulations.

Hunter-killed ducks and geese were examined with a modified metal

detector at public and private hunting areas in nontoxic shot zones throughout

central Illinois during the 1991 hunting season. In addition, ducks were

live-trapped during the winter and spring 1992 to determine the type of

embedded shot present in birds following the hunting season.

Lead shot was found in 1.1 percent of 1,426 hunter-killed ducks examined

and 0 of 112 live-trapped ducks. The incidences of lead shot in immature

ducks was 1.1 percent in hunter-killed ducks. Lead shot was found in 1.8

percent of 226 hunter-killed Canada geese. In 1991, hunter compliance with

nontoxic shot regulations was 98.9 percent for ducks and 96.5 percent for

geese. The percentage of hunter-killed and live-trapped waterfowl containing

lead pellets in 1991-1992 was lower than waterfowl containing lead pellets in

1989-1990. There was a noticeable trend for increased acceptance of nontoxic

shot regulations by duck and goose hunters in Illinois during the three years

of study from 1989-1990 through 1991-1992.

A summary of the third and last year of this study is included in the

attached report.

Study 103 AERIAL CENSUSES OF WATERFOWL

Job 103.1 Spring Waterfowl Censuses Along the Illinois River,

Mississippi River, and Central-Southern Reservoirs.

Aerial inventories of waterfowl were conducted weekly during spring

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migration from 25 February through 14 April 1992 in the Illinois River valley

(Spring Valley to Grafton) and upper Mississippi River valley (Grafton to Rock

Island), and biweekly from 30 January to 13 April 1992 along the lower

Mississippi River (Cairo to St. Louis) and on major reservoirs and power plant

lakes in central and southern Illinois. The results are presented in the

attached report.

Job 103.2 Fall Waterfowl Censuses Along the Illinois River,

Mississippi River, and Central-Southern Reservoirs.

Aerial inventories of waterfowl were conducted during fall migration on

4 and 12 September 1991 and weekly from 7 October 1991 to 9 January 1992 in

the Illinois River valley (Spring Valley to Grafton) and upper Mississippi

River valley (Grafton to Rock Island). Biweekly censuses were conducted from

9 October 1991 to 10 January 1992 along the lower Mississippi River (Cairo to

St. Louis) and on major reservoirs and power plant lakes in central and

southern Illinois. The results are presented in the attached report.

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STUDY 101 LEAD POISONING INVESTIGATIONS

JOB 101.1 HUNTER COMPLIANCE WITH NONTOXIC SHOT REGULATIONS

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Nationwide use of nontoxic (steel) shot for waterfowl hunting has the

potential for saving 1.6-2.4 million ducks and geese annually from lead

poisoning. Nontoxic shot was required for all sport hunting of waterfowl in

the United States during the 1991-1992 hunting season. This is the first

major change in regulations affecting waterfowl hunters since the prohibition

of live decoys and baiting and the implementation of the 3-shell limit for

shotguns in the 1930s. Because the mandatory use of steel shot has been

opposed by many hunters, there was concern about compliance with nontoxic shot

regulations. Determination of the degree of hunter compliance with the phase-

in of nontoxic shot regulations was necessary.

METHODS

During the third year of this study in the 1991 waterfowl season, state

(public) hunting areas with mandatory check stations were selected for

monitoring hunter compliance. Before the hunting season, correspondence was

sent to all public areas mentioning that an unannounced visit to their area

might be made. As in 1989 and 1990, ten public hunting areas in the Illinois

River valley were monitored once during the 1991 duck hunting season in the

central zone (duck season: 1 November to 30 November; goose season: 1

November to 20 January). The public hunting areas where hunter-harvested

birds were examined in 1989, 1990 and 1991 were Marshall County, Woodford

County, Powerton Cooling Lake, Rice Lake, Spring Lake, Anderson Lake,

Sanganois-Chandlerville, Sanganois-Browning, Batchtown, and Stump Lake. In

addition, harvested Canada geese were monitored in 1990 and 1991 at the Union

County Public Hunting Area in southern Illinois. The 1991 goose hunting

season in the southern Illinois quota zone was 9 November to 31 January.

Data were also obtained by periodically examining hunter-killed ducks and

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geese at commercial waterfowl picking operations located along the Illinois

River and in southern Illinois. During each of the three study years, ducks

and geese examined at the commercial waterfowl picking operations were

harvested in nontoxic shot counties.

Live-trapped ducks were monitored after the 1990 and 1991 hunting seasons

to determine background levels of embedded shot. A total of 112 ducks were

live-trapped and examined from 28 February to 16 April 1992 at two sites on

Quiver Creek in Mason County in central Illinois. Live-trapping of Canada

geese at Union County Refuge was successful only in 1990 because of early

northward migrations in 1991 and 1992. Live-trapped, flightless adult giant

Canada geese were examined in northeastern Illinois in summer 1991 and in

west-central Illinois (Tri-County Zone) during the summers of 1991 and 1992.

At each trapping and harvest site, the species, age, sex, and the

presence and type of body shot (lead or steel) were recorded for each bird.

Infrequently, a hunter-killed bird was examined and no shot was found; in

these few cases, the bird was recorded as containing steel shot because some

small ducks, such as green-winged teal, were shot with large steel pellets

(ie. No. 2) that passed completely through the birds.

A Coinmaster 4900/D metal detector manufactured by White's Electronics,

Saddle Brook, New Jersey, was factory-modified for determination of the

differentiation between lead and steel shotgun pellets. An Illinois

Department of Conservation officer successfully field tested this instrument

for law enforcement purposes during the 1987 Illinois waterfowl season. The

accuracy of the four operators of the metal detector in this study was

periodically tested by utilizing sample waterfowl carcasses embedded with

known lead and/or steel pellets but unknown to the operators of the metal

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detector, and by examination of wounds and removal of shot from carcasses in

hunter-killed birds for verification of the shot composition. Additionally,

the operators frequently checked known samples of lead and steel pellets with

the detector to verify their interpretation. It is possible that a small

number of live-trapped and harvested birds found to have shot contained

ingested shot rather than embedded shot.

Hunter compliance is defined in this report as the percentage of hunter-

killed birds having only steel shot present; noncompliance represents the

percentage of birds with only lead shot present. Hunter compliance and

noncompliance rates may not sum to 100 percent for a particular sample because

some birds contained both lead and steel shot. Compliance and noncompliance

rates from live-trapped birds were based on the shot composition of only those

birds found to have embedded shot and not on the entire number captured. The

percentage of captured birds with shot is the embedded shot rate.

RESULTS

Harvested Ducks

A total of 1,426 hunter-killed ducks were examined in 1991 and 98.9

percent contained only steel shot and 1.1 percent contained only lead pellets

as compared with 1.6 percent having only lead pellets in 1,081 ducks harvested

in 1990 (Table 1). These values equate to 98.9 percent compliance and 1.1

percent noncompliance for 1991 as compared with 1.6 percent noncompliance in

1990.

The percentages of lead and steel shot in hunter-killed ducks were

examined by age class (Table 1). In 1991, immature hunter-killed ducks

contained nearly the same percentage of lead shot as adults (1.1 and 1.0%,

respectively; Table 1). These values were 1.1 percent for immatures and 1.8

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percent for adult ducks in the 1990 hunting season. Based upon the rate found

for only lead shot in adult ducks, the minimum rate of noncompliance for duck

hunters was 1.0 percent in the 1991 hunting season, whereas the maximum rate

of noncompliance, which is that found for immature ducks, was 1.1 percent.

Lead shot in adult ducks could have been acquired over a period of years, but

lead shot in immature ducks less than one year old was received in 1991.

Dabbling ducks comprised the majority of the sample (n = 1,304, Table 2)

with mallards representing 64.0 percent. For all dabbling ducks, 1.0 percent

tested positive for lead shot. Values for dabbling ducks containing lead shot

ranged from 0.0 percent for American black ducks, northern pintails, American

wigeons, and northern shovelers to 33.3 percent for blue-winged teal. Lesser

scaup and ring-necked ducks were the most common diving ducks examined (Table

3). A total of 1.7 percent of the 121 hunter-killed diving ducks tested in

1991 contained lead shot.

The largest sample of hunter-killed ducks in 1991 was obtained on

opening day at the Marshall County Public Hunting Area (Table 4). The

percentages of ducks harvested on public hunting areas in 1991 containing lead

shot ranged from 0.0 percent to 5.3 percent. Ducks examined at commercial

picking operations contained almost the same amount of lead shot as birds

harvested and examined on public hunting areas in 1991 (1.0% on public hunting

areas and 1.1% at commercial picking operations) (Table 5).

Live-trapped Ducks

In spring 1992, the incidence of embedded shot was 6.3 percent for all

live-trapped ducks. No lead shot was detected in any of the ducks live-

trapped in 1992; therefore, hunter compliance was 100 percent based upon this

sample. In spring 1991, 3 (2.7%) of 113 live-trapped ducks contained lead

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shot and 7 birds (6.2%) contained steel shot, representing 30 percent

noncompliance and 70 percent compliance for the 10 ducks with embedded shot in

spring 1991.

Harvested Geese

All 226 hunter-killed geese examined in 1991 were Canadas. Lead shot,

or noncompliance, was found in 1.6 percent of the adults and 2.4 percent of

the immatures compared with 2.6 percent and 0.0 percent, respectively, in 1990

(Table 6). The overall noncompliance for goose hunters improved to 1.8

percent in 1991 from 2.1 percent for the 1990 hunting season. Few immature

Canada geese were harvested during the 1990 and 1991 hunting seasons because

of poor production on the breeding grounds. The percentages of Canada geese

containing lead shot were 0.0 percent on public hunting areas and 1.9 percent

at commercial picking operations in 1991 (Table 7).

Live-trapped Geese

Based upon all Canada geese live-trapped, compliance rates were 73.4,

85.3, and 86.2 percent for 1990, 1991, and 1992, respectively; noncompliance

rates were 25.7, 14.7, and 11.5 percent, respectively, for the same years

(Table 6). The trend was for better acceptance of the nontoxic shot

regulations, especially considering that all of the live-trapped geese were

adults except for those examined in 1990. The 367 immature Canada geese live-

trapped in 1990 demonstrated 74.1 percent compliance and 24.1 percent

noncompliance rates.

The incidence of all embedded shot (lead, steel, and both) contained in

adult Canada geese captured in west-central Illinois increased from 21.9

percent in 1991 to 33.9 percent in 1992. A possible explanation for the

higher embedded shot rate found in these geese was an increase in hunting

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pressure associated with an expansion of the season length in the Tri-County

Zone from 50 days in 1990 to 70 days in 1991. In addition, the occurrence of

only lead shot in these geese increased from 2.8 percent in 1991 to 3.9

percent in 1992.

CONCLUSIONS

Overall, compliance with nontoxic shot regulations in 1991 was better for

duck hunters (98.9% compliance or birds with only steel shot; 1.1%

noncompliance or birds with only lead shot) than for goose hunters (96.5%

compliance; 1.8% noncompliance for Canada geese). Hunter compliance with

nontoxic shot regulations in 1991 was only slightly higher for ducks harvested

on public hunting areas (99.0%) than for ducks taken to commercial picking

operations (98.9%) and likely harvested on private areas. Hunter compliance

(90.0%) was lower for a very small sample of 10 Canada geese harvested on

public hunting areas than for geese taken to commercial picking operations

(96.8%) in 1991.

Hunter compliance for the harvested ducks examined increased from 90.8

percent in 1989 and 98.2 percent in 1990 to 98.9 percent in 1991. Goose

hunter compliance increased from 50 percent (28.6% noncompliance) for a very

small sample of harvested geese examined in 1989 to 97.2 percent in 1990 and

remained about the same in 1991 at 96.5 percent. Based upon live-trapped

samples, hunter compliance for ducks was 70 percent in spring 1991 and 100

percent in spring 1992. Live-trapped geese demonstrated hunter compliance

rates of 73.4, 85.3, and 86.2 percent for the springs of 1990, 1991, and 1992,

respectively. There was a noticeable trend for increased acceptance of

nontoxic shot regulations by duck and goose hunters in Illinois during the

three years of study from 1989-1990 through 1991-1992.

6

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Table 1. Percentage of lead and steel shot detected in hunter-killed and live-trapped ducks by age-class for all areas.Hunter-killed birds were examined during the 1989, 1990 and 1991 hunting seasons, and live-trapped birds were examinedin spring 1991 and 1992.

Percentage of Shot

Age No. Examined Lead Steel Both1989 1990-91 1991-92 1989 1990-91 1991-92 1989 1990-91 1991-92 1989 1990-91 1991-92

Hunter-killeda Adult 200 711 817 8.0 1.8 1.0 90.5 97.9 99.0 1.5 0.3 0.0Immature 219 355 549 7.3 1.1 1.1 91.3 98.9 98.9 1.4 0.0 0.0Unknown 69 15 60 8.7 0.0 1.7 89.9 100.0 98.3 1.4 0.0 0.0

Total 488 1,081 1,426 7.8 1.6 1.1 90.8 98.2 98.9 1.4 0.2 0.0

Live-trapped 113 112 2.7 0.0 6.2 6.3 0.0 0.0

a Includes 1 coot in 1989, 5 coots in 1990 and 1 coot in 1991.

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Table 2. Percentage of dabbling ducks containing embedded shot, lead shot,steel shot, or both lead and steel shot for all areas. Hunter-killed birdswere examined during the 1989, 1990 and 1991 hunting seasons, and live-trappedbirds were examined in spring 1991 and 1992.

Percentage of ShotNo.

Species Examined Embedded Lead Steel Both

MallardHunter-killed

198919901991

Live-trapped19911992

Black duckHunter-killed

198919901991

Live-trapped1991

Blue-winged tealHunter-killed

19901991

Live-trapped19911992

Green-winged tealHunter-killed

198919901991

Live-trapped1991

GadwallHunter-killed

198919901991

PintailHunter-killed

198919901991

213666835

326

41111

2

433

352

728674

25

2236

102

1476

00

0.019.2

100

100.0

2.90.0

4.0

(6.6)(1.1)(0.7)

(0.0)(0.0)

(25.0)(0.0)(0.0)

0 (0.0)

1 (2.3)1 (33.3)

00

603

196 (92.0)657 (98.6)829 (99.3)

05

320

(1.4)(0.3)(0.0)

(0.0) 0 (0.0)(19.2) 0 (0.0)

3 (75.0)L1 (100.0)L1 (100.0)

2 (100.0)

422

10

658671

(0.0)(0.0)

(8.3)(0.0)(4.1)

0 (0.0)

021

210

136635

(0.0)(5.6)(1.0)

(15.4)(1.5)(0.0)

(97.7)(66.7)

000

(0.0)(0.0)(0.0)

0 (0.0)

0 (0.0)0 (0.0)

(2.9) 0 (0.0)(0.0) 0 (0.0)

(90.3)(100.0)(95.9)

100

(1.4)(0.0)(0.0)

1 (4.0) 0 (0.0)

22 (100.0)34 (94.4)

101 (99.0)

116535

(84.6)(98.5)

(100.0)

000

000

(0.0)(0.0)(0.0)

(0.0)(0.0)(0.0)

]]

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Table 2.(continued)

Percentage of ShotNo.

Species Examined Embedded Lead Steel Both

WigeonHunter-killed

198919901991

ShovelerHunter-killed

198919901991

Wood duckHunter-killed

198919901991

Live-trapped19911992

TotalHunter-killed

198919901991

Live-trapped19911992

111751

131616

8382

177

4784

10.62.4

4311,0231,304

112112

000

(0.0)(0.0)(0.0)

(30.8)(0.0)

(0.0)

(10.8)(3.7)(1.1)

3 (6.4)0 (0.0)

361413

8.06.3

30

(8.4)(1.4)(1.0)

(2.7)(0.0)

111751

71616

(100.0)(100.0)(100.0)

(53.8)(100.0)(100.0)

74 (89.2)79 (96.3)

175 (98.9)

000

200

000

(0.0)(0.0)(0.0)

(15.4)(0.0)(0.0)

(0.0)(0.0)(0.0)

(4.3) 0 (0.0)(2.4) 0 (0.0)

3891,0071,291

(90.3)(98.4)(99.0)

620

(1.4)(0.2)(0.0)

(5.4) 0 (0.0)(6.3) 0 (0.0)

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Table 3. Percentage of diving ducks containing embedded shot, lead shot,steel shot, or both lead and steel shot for all areas. Hunter-killed birdswere examined during the 1989, 1990 and 1991 hunting seasons, and live-trappedbirds were examined in spring 1991.

Percentage of Shot

No.Species Examined Embedded Lead Steel Both

ScaupHunter-killed

198919901991

Ring-necked duckHunter-killed

198919901991

Live-trapped1991

RedheadHunter-killed

198919901991

GoldeneyeHunter-killed

19891991

BuffleheadHunter-killed

198919901991

Ruddy duckHunter-killed

198919901991

Common merganserHunter-killed

1989Hooded merganser

Hunter-killed19891991

Red-breasted merganserHunter-killed

1991

252250

71735

1

246

100.0

100

020

(4.0)(0.0)(0.0)

(0.0)(11.8)(0.0)

0 (0.0)

(50.0)(0.0)(0.0)

(0.0)(0.0)

(0.0)(0.0)

(18.2)

6211

27

10

(0.0)(0.0)(0.0)

0 (0.0)

(0.0)(0.0)

24 (96.0)22 (100.0)50 (100.0)

6 (85.7)15 (88.2)35 (100.0)

1 (100.0)

(50.0)(100.0)(100.0)

1 (100.0)5 (100.0)

2710

(100.0)(100.0)(81.8)

(100.0)(100.0)(100.0)

8 (100.0)

4 (100.0)3 (100.0)

1 0 (0.0)

0 (0.0)0 (0.0)0 (0.0)

1 (14.3)0 (0.0)0 (0.0)

0 (0.0)

000

(0.0)(0.0)(0.0)

0 (0.0)0 (0.0)

0 (0.0)0 (0.0)0 (0.0)

0 (0.0)0 (0.0)0 (0.0)

0 (0.0)

0 (0.0)0 (0.0)0 (oo)

1 (100.0) 0 (0.0)

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Table 3.(continued)

Percentage of Shot_.

No.Species Examined Embedded Lead Steel Both

CanvasbackHunter-killed

1989Total

Coot

Hunter-killed198919901991

Live-trapped1991

Hunter-killed198919901991

ScoterHunter-killed

1990

5652

121

100.0

0 (0.0)

(3.6)(3.8)(1.7)

0 (0.0)

010

(0.0)(20.0)(0.0)

1 (100.0)

53 (94.6)50 (96.2)

119 (98.3)

1 (100.0)

141

(100.0)(80.0)

(100.0)

1 0 (0.0)

0 (0.0)

(1.8)(0.0)(0.0)

0 (0.0)

000

(0.0)(0.0)(0.0)

--

1 (100.0) 0 (0.0)

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Table 4. Percentage of lead and steel shot detected in waterfowl harvested from publichunting areas, 1989, 1990 and 1991 hunting seasons.

Percentage of ShotNo.

Area Examined Lead Steel, Both1989 1990 1991 1989 1990 1991 1989 1990 1991 1989 1990 1991

Marshall CountyDucksGeese

Woodford CountyDucksGeese

172

10 2 0 8a

32 38 691

5.90.0

0.0 0.0 94.150.0

6.3 2.6 0.00.0

100.0 100.0

90.6 97.4 100.0100.0

0.050.0

0.0 0.0

3.1 0.0 0.00.0

Powerton Cooling LakeDucksGeese

225

23 10 4.540.0

0.0 0.0 90.940.0

100.0 100.0

Rice LakeDucks

Spring LakeDucksGeese

Anderson LakeDucksGeese

3 8 41 0.0 0.0 0.0 100.0 100.0 100.0

591

24 24 b

3b

33 31

5.10.0

49 12.1 0.00.0

4.2 0.0 89.80.0 100.0

95.8 100.066.7

0.0 84.8 100.0 100.0100.0

0.0 0.0 0.0

5.10.0

0.0 0.033.3

3.0 0.00.0

0.0

Sanganois-ChandlervilleDucks 243 51 207 9.9 0.0 1.4 90.1 100.0 98.6

Sanganois-BrowningDucks 4 29 24 0.0 0.0 0.0 100.0 100.0 100.0

0.0 0.0 0.0

0.0 0.0 0.0

BatchtownDucksGeese

Stump LakeDucksGeese

485

271

4342

131

95 6.3 1.140.0 0.0

60 0.00.0

5.3 93.8 98.940.0 100.0

1.5 0.0 96.3100.0

94.7

98.5 100.0

Union CountyGeese 56 6 3.6 0.0 92.8 100.0

Total DucksTotal Geese

488 751 787 7.8 1.2 1.0 90.8 98.8 99.014 59 10 28.6 3.4 0.0 50.0 93.2 90.0

1.4 0.0 0.021.4 3.4 10.0

a Includes 1 coot.A sample from the Spring Lake public hunting area was not available in

poor weather conditions. However, samples of waterfowl shot at Spring

examined at a commercial picking operation.

1991 because ofLake were

4.520.0

0.0 0.0

0.0 0.020.0 0.0

0.0

3.70.0

0.0 0.0

3.6 0.0

I -

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Table 5. Percentage of lead and steel shot detected in hunter-killed ducks at public hunting areas and

commercial picking operations during the 1989, 1990 and 1991 seasons.

Percentage of Shot

No. Examineda Lead SteeL Both

1989 1990 1991 1989 1990 1991 1989 1990 1991 1989 1990 1991

Public Hunting Areas 488 751 786 7.8 1.2 1.0 90.8 98.8 99.0 1.4 0.0 0.0

Commercial Picking Operations 330 640 2.4 1.1 97.0 98.9 0.6 0.0

Total 488 1,081 1,426 7.8 1.6 1.1 90.8 98.2 98.9 1.4 0.2 0.0

a Includes 1 coot in 1989, 5 coots in 1990 and 1 coot in 1991 examined at public hunting areas.

Page 21: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

Table 6. Percentage of lead and steel shot detected in hunter-killed and live-trapped Canada geese by age class for allareas. Hunter-killed birds were examined during the 1989, 1990 and 1991 hunting seasons, and live-trapped birds wereexamined in spring 1990, 1991 and 1992.

Percentage of Shot

Age No. Examineda Lead Steel Both1989-90 1990-91 1991-92 1989-90 1990-91 1991-92 1989-90 1990-91 1991-92 1989-90 1990-91 1991-92

Hunter-killed Adult 231 183 2.6 1.6 96.5 96.2 0.9 2.2Immature 44

b 41 0.0 2.4 100.0 97.6 0.0 0.0Unknown 14 11 2 28.6 0.0 0.0 50.0 100.0 100.0 21.4 0.0 0.0

Total 14 286b 226 28.6 2.1 1.8 50.0 97.2 96.5 21.4 0.7 1.8

Live-trappedc Adult 274 434 257 5.1 2.5 3.9 13.5 14.7 29.2 0.0 0.0 0.8Immature 367 3.8 11.7 0.3

Total 641 434 257 4.4 2.5 3.9 12.5 14.7 29.2 0.2 0.0 0.8

a During the 1990 and 1991 hunting seasons, examination of geese at commercial picking operations took place primarily at

one picker in southern Illinois.Includes 1 blue goose.

c Canada geese were live-trapped in southern Illinois in 1990, west-central and northeastern Illinois in 1991, and west-central Illinois in 1992.

Page 22: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

Table 7. Percentage of lead and steel shot detected in hunter-killed Canada geese at public huntingareas and commercial picking operations during the 1989, 1990 and 1991 seasons.

Percentage of Shot

No. Examined Lead Steel Both1989 1990 1991 1989 1990 1991 1989 1990 1991 1989 1990 1991

Public Hunting Areas 14 59b 10 28.6 3.4 0.0 50.0 93.2 90.0 21.4 3.4 10.0

Commercial Picking Operationsa 227 216 1.8 1.9 98.2 96.8 0.0 1.4

Total 14 286b 226 28.6 2.1 1.8 50.0 97.2 96.5 21.4 0.7 1.8

a During the 1990 and 1991 hunting seasons, examination of geese at commercial picking operations took

place primarily at one picker in the southern Illinois quota zone.

Includes 1 blue goose

Page 23: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

STUDY 103 AERIAL CENSUSES OF WATERFOWL

JOB 103.1 SPRING WATERFOWL CENSUSES ALONG THE ILLINOIS RIVER,MISSISSIPPI RIVER, AND CENTRAL-SOUTHERN RESERVOIRS

Page 24: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

For the third consecutive year since 1985, aerial

inventories were conducted periodically during the 1992 spring

migration in the Illinois River valley from Spring Valley south

to Grafton and in the upper Mississippi River valley from

Grafton north to Rock Island. Inventories were made on 25

February; 2, 11, 16, and 24 March; and 1, 7, and 14 April.

Biweekly inventories were also conducted in the lower

Mississippi River valley from Cairo north to St. Louis and on

power plant cooling lakes and major reservoirs in central and

southern Illinois on 30 January; 20 February; 3, 20, and 31

March, and 13 April.

Peak (highest) population values in spring 1992 in the

Illinois Valley were lower than those for 1991 for all species

of waterfowl inventoried with the exception of green-winged

teal, northern shovelers, and ring-necked ducks. During spring

1992 the peak number of total ducks in the Illinois Valley was

107,540 as compared with 191,250 in spring 1991 and a 1981-1985

5-year average of 309,116. The peak number of mallards was

66,020 in 1992 as compared with 143,060 in 1991 and an average

of 147,229 for 1981-1985. The peak number of Canada geese in

the Illinois Valley was 3,220 in 1992, a noticeable decrease

from 37,555 in 1991 and the 1981-1985 average of 68,435.

In the upper Mississippi River valley, peak numbers of all

dabbling duck species inventoried increased between 1991 and

1992 while peak numbers for all diving duck species inventoried

decreased. The peak number recorded for lesser scaups during

spring 1992 was 23,880, the lowest spring peak recorded since

Page 25: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

the first Illinois Natural History Survey (INHS) spring aerial

inventory in 1955. Similarly, the 1992 spring peak number for

canvasbacks was 12,950, the lowest spring peak recorded by INHS

since 1960. Peak numbers in spring for mallards in 1992, 1991,

and the 1981-1985 period were 41,585, 36,380, and a mean of

74,396, respectively. The 1992 peak number of 1,975 Canada

geese was lower as compared with 2,695 for 1991 and a 1981-1985

5-year average of 11,067.

For the third consecutive year since 1985, aerial waterfowl

inventories of selected cooling lakes and reservoirs in central and

southern Illinois and the floodplain of the lower Mississippi

River from Cairo to St. Louis were conducted during the 1992

spring migration. Areas inventoried included Newton, Sangchris,

Clinton, Coffeen, and Baldwin cooling lakes and Shelbyville,

Carlyle and Rend reservoirs. The peak number of all ducks

inventoried in the lower Mississippi River valley during the

spring of 1992 was 2,630, higher than the 1991 peak of 1,470 but

lower than the 1981-1985 5-year average of 28,922. For cooling

lakes, the peak number for all ducks in 1992 was 20,790,

slightly higher than 20,010 for 1991 and the 1981-1985 average

of 16,700. For the three reservoirs the spring peaks for 1992,

1991, and the 1981-1985 period were 45,875, 56,410 and a mean of

40,630, respectively. During 1992, 1991 and the 1981-1985

period, peak numbers of mallards in the lower Mississippi River

valley were 2,475, 1,300, and a mean of 10,520. For cooling

lakes, peak numbers for mallards were 10,350 in 1992, 16,705 in

1991, and an average of 11,200 for 1981-1985. Spring peak

Page 26: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

numbers for mallards at the reservoirs were 21,325 in 1992,

44,400 in 1991 and an average of 18,900 for the 1981-1985

period.

Spring peak numbers of Canada geese on reservoirs in 1992

showed a sizeable increase from 1991 but showed little change on

cooling lakes. On reservoirs peak numbers of Canada geese were

55,175 in 1992, 18,470 in 1991 and an average of 64,500 for

1981-1985. On cooling lakes, spring peaks for 1992, 1991, and

the 1981-1985 period were 8,580, 16,825 and an average of 4,956.

No Canada geese were recorded in the lower Mississippi River

valley.

Page 27: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

ILLINOIS AND CENTRAL MISSISSIPPI RIVERS CENSUSES BY DATE

Page 28: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

KEY TO SPECIES ABBREVIATIONS

MALLARDBLKPNTBWTGWTWIGGADSHSCAUPRNCNVBRHRDYGLDBHOLDC.MERRB.MERH.MERTOT.DUCKCGB&SGCOOTPEL

American black duckNorthern pintailBlue-winged tealGreen-winged tealAmerican wigeonGadwallNorthern shovelerLesser and greater scaupRing-necked duckCanvasbackRedheadRuddy duckCommon goldeneyeBuffleheadOldsquawCommon merganserRed-breasted merganserHooded merganserTotal ducksCanada gooseSnow goose

= Pelican

Page 29: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

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Page 30: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

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Page 31: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

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Page 32: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

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Page 33: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

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Page 34: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

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Page 67: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

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Page 68: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

STUDY 103 AERIAL CENSUSES OF WATERFOWL

JOB 103.2 FALL WATERFOWL CENSUSES ALONG THE ILLINOIS RIVER,MSISSISSIPPI RIVER, AND CENTRAL-SOUTHERN RESERVOIRS

Page 69: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

Aerial inventories of waterfowl were conducted weekly

during the 1991 fall migration in the Illinois River valley from

Spring Valley south to Grafton and in the upper Mississippi

River valley from Grafton north to Rock Island. Inventories

were made on 4 and 12 September; 7, 15, and 21 October; 4, 13,

18, and 25 November; 4 and 9 December; and 9 January. Biweekly

inventories were conducted in the lower Mississippi River valley

from Cairo north to St. Louis and on power plant cooling lakes

and major reservoirs in central and southern Illinois on 9

October; 5 and 21 November; 10 December; and 10 January.

Peak (highest) numbers of all ducks inventoried during the

fall of 1991 in both the Illinois and upper Mississippi River

valleys were higher than the values recorded for 1990. In the

Illinois River valley, the peak number of all ducks inventoried was

570,210 for 1991, 48.2% higher than the 1990 peak of 295,200 and

higher than the 5-year mean of 432,402 for 1986-1990. The peak

number for all ducks inventoried in the upper Mississippi River

valley during the fall of 1991 increased 9.2% from the 1990 peak

of 297,170 to the 1991 peak of 324,535 and increased 30.4% from

the 1986-1990 5-year mean of 248,881.

All species of ducks inventoried in the Illinois River valley

during the fall of 1991, with the exception of northern

pintails, green-winged teal, northern shovelers, lesser scaups,

and canvasbacks, showed an increase in peak numbers. During

1991, 1990, and the 1986-1990 period, the peak numbers of

mallards inventoried in the Illinois Valley were 474,075,

272,775, and a mean of 357,292, respectively. The fall 1991

Page 70: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

peak for gadwalls in the Illinois Valley was 33,475, the highest

fall peak recorded since the first Illinois Natural History

Survey aerial inventory in 1948. In the upper Mississippi River

valley, 1991 peak numbers for several species of ducks were

higher than the 1990 peaks. These species included mallards,

American black ducks, American wigeon, gadwalls, ring-necked

ducks, and common goldeneyes. Peak numbers for mallards in the

Upper Mississippi River valley were 230,295 for 1991, 229,370

for 1990, and an average of 201,936 for the 1986-1990 period.

The fall 1991 peak number for canvasbacks in the upper

Mississippi River region was 23,475, a 58.7% decrease from the

1990 fall peak of 56,845 and 63.7% lower than the 1986-1990 5-

year average of 64,597. During 1991, 1990, and the 1986-1990

period, the peak numbers of lesser scaups inventoried in the

upper Mississippi River valley were 23,970, 35,690, and a mean

of 94,782, respectively.

The fall 1991 peak number of Canada geese in the Illinois

River valley decreased 63.9% from the 1990 peak whereas in the

upper Mississippi River valley the 1991 peak number decreased

80.1% from 1990. In the Illinois Valley numbers decreased from

23,880 in 1990 to 8,620 in 1991. In the upper Mississippi

Valley, the fall peak number of Canada geese decreased from the

1990 peak of 31,180 to 6,215 for 1991. Five-year (1986-1990)

averages of peak numbers in the Illinois and Mississippi river

valleys are 31,352 and 24,381, respectively.

The number of use-days expended by waterfowl during the

1991 fall migration in the Illinois River valley were higher

Page 71: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

than use-days for 1990 for all species with the exception of

canvasbacks and northern shovelers. In the Illinois Valley use-

days for 1991 and 1990, respectively, were 16,452,770 and

10,562,146 for total ducks, 12,946,818 and 9,098,020 for

mallards, and 416,798 and 498,917 for Canada geese. In the

upper Mississippi River valley the number of use-days expended

by mallards, American black ducks, American wigeon, gadwalls,

ring-necked ducks, and common goldeneyes during the 1991 fall

migration were higher than 1990 use-days while all other species

showed a decrease from 1990. In the upper Mississippi River

valley use-days for 1991 and 1990, respectively, were 11,543,045

and 11,419,358 for total ducks, 8,120,468 and 7,445,043 for

mallards, 645,223 and 667,125 for lesser scaups, 663,260 and

1,651,435 for canvasbacks, and 369,305 and 1,026,261 for Canada

geese.

For the fifth consecutive year since 1984, aerial waterfowl

inventories of selected power plant cooling lakes and reservoirs in

central and southern Illinois and the floodplain of the lower

Mississippi River valley from Cairo to St. Louis were conducted

during the 1991 fall migration. Areas inventoried included Newton,

Sangchris, Clinton, Coffeen, and Baldwin cooling lakes and

Shelbyville, Carlyle and Rend reservoirs. In the lower

Mississippi River valley the peak number of all ducks

inventoried during the fall of 1991 was 2,710, varying little

from the 1990 value of 2,655 but lower than the 1980-1984 5-year

mean of 13,654. At cooling lakes, the 1991 fall peak number of

20,685 for all ducks was lower than the 1990 peak of 48,575 and

Page 72: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

lower than the 1980-1984 5-year mean of 35,311. The 1991 fall

peak for all ducks at the three reservoirs was 69,570, higher

than the 1990 peak of 39,505 and higher than the 1980-1984 5-

year average of 56,619. During 1991, 1990 and the 1980-1984

period, the peak numbers of mallards inventoried in the lower

Mississippi River valley were 2,360, 1,770, and 9,944,

respectively. For cooling lakes the fall peaks for mallards

were 16,245 for 1991, 47,285 for 1990, and a 5-year 1980-1984

average of 31,460. For the reservoirs the fall peaks for

mallards were 41,520 for 1991, 36,660 for 1990, and 46,660 for

the 5-year 1980-1984 average.

Fall peak numbers of Canada geese in 1991 were lower at

cooling lakes and higher at reservoirs as compared with 1990

values. At cooling lakes, peak numbers for all Canada geese

inventoried during fall migrations of 1991, 1990, and the 1980-

1984 period were 7,450, 11,095, and an average of 3,408,

respectively. For reservoirs peak numbers of Canada geese were

47,420 in 1991 compared with 40,275 in 1990 and the 1980-1984 5-

year average of 21,945. In the lower Mississippi River valley,

the peaks for Canada geese were 100 for 1991, 300 for 1990 and a

5-year 1980-1984 average of 4,944.

Page 73: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

ILLINOIS AND CENTRAL MISSISSIPPI RIVERS CENSUSES BY DATE

Page 74: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

KEY TO SPECIES ABBREVIATIONS

MALLARDBLKPNTBWTGWTWIGGADSHSCAUPRNCNVBRHRDYGLDBHOLDC.MERRB.MERH.MERTOT.DUCKCGB&SGCOOTPEL

=

American black duckNorthern pintailBlue-winged tealGreen-winged tealAmerican wigeonGadwallNorthern shovelerLesser and greater scaupRing-necked duckCanvasbackRedheadRuddy duckCommon goldeneyeBuffleheadOldsquawCommon merganserRed-breasted merganserHooded merganserTotal ducksCanada gooseSnow goose

= Pelican

Page 75: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

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Page 123: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

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Page 124: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

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Page 129: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

PREPARED BY:

Stephen P. HaveraProfessional ScientistIllinois Natural History Survey

DATE: 15 July 1992

Page 130: core.ac.uk · SEGMENT PERFORMANCE REPORT - FY 1992 Illinois Waterfowl Surveys and Investigations Federal Aid in Wildlife Restoration W-43-R(S1) - 40 Study 101 LEAD POISONING INVESTIGATIONS

Illinois Natural History Survey A Division of the Department of Energynd Natural Resources

Forbes Biological Station, Waterfowl Research Laboratory, Box 599, Havana, /I' '309) 543-3950

7.

15 July 1992

Mr. Mike SweetIllinois Dept. of ConservationLincoln Tower Plaza524 S. Second StreetSpringfield, IL 62701-1787

RE: Annual Report for W-43-R(S1)-40. Illinois Waterfowl Surveysand Investigations

Dear Mike:

Five copies of the above referenced report are enclosed.

Sincerely,

Stephen P. HaveraDirectorForbes Biological Station

SPH:kr

Enclosures

cc: Richard E. Warner