Prince William Sound Shoreline Rare Plant Surveys
description
Transcript of Prince William Sound Shoreline Rare Plant Surveys
Prince William Sound Shoreline Rare Plant Surveys
2009-2010USDA Forest Service
Prince William Sound Framework
Evaluate and improve current management framework in the Sound in response to increased human use and EVOS
Objectives: Delineate human use “hot spots”
Map sensitive cultural and biological resources
Further justification
Bioenvironmental analysis for rare plant habitat concluded PWS has highest potential on Chugach N. Forest.
Unique geologies and beaches
No systematic plant surveys to date (2009).
Prince William SoundShorelines
Sitka Spruce/Western/Mountain Hemlock Dominated Forests with a few pockets of Alaska Yellow Cedar
Luxurious Fens
Intriguing UpperBeach Meadows
Target rare/sensitive plant species:
Botrychium spathulatumB. TunuxB. yaaxudakeit
Cochlearia sessifoliaRomanzoffia unalaschcensis
Cypripedium guttatumC. Parviflorum var. pubescens Piperia unalascensis
Tanacetum bipinnatum ssp. huronese
Papaver alboroseum
Methods
120 systematic plots selected using ArcGIS Create Random Points tool and the shoreline_line coverage as the constraining feature class.
Methods cont.
30 subjective plots were selected by using known locations of rare plants, unique geologies, or unique beach habitats
Sites were surveyed following the USFS Threatened, Endangered, and Sensitive Plant Survey Protocol>
• 1 hour per site• random or intuitive meander within 1 km of shoreline• document every species encountered.
Collections were also made for many species and are housed at the UAF Herbarium
Methods, cont.
Surveys conducted by:
Marilyn Barker, UAA
Rob Lipkin, Natural Heritage Program
Helen Cortes-Burns, Natural Heritage Program
Jonnie Lazarus, Girdwood Parks and Rec.
Al Batton, UAF
Mary Stensvold, USFS
Betty Charnon, USFS
Erin Cooper, USFS
Kate Mohatt, USFS
Pete Johnson, USFS
Rob DeVelice, USFS
Results
90 systematically selected and 10 subjectively selected sites surveyed in 2009
10 subjectively selected sites surveyed in 2010
Results cont. • 384 total plant taxa recorded (181 taxa known previously)
• Two Region 10 designated sensitive plant species at 5 locations
• Range extensions for 2 species
• 5 AKNHP Tracked Species
• 181 specimens contributed to UAF Herbarium (more coming from AKNHP)
Malaxis paludosa G4, S3
Occurrence: 2
Platanthera chorisanaG3, S3
Occurrence: 16 Carex lenticularis var. doliaOccurrence: 2
AKNHP Tracked/ Ranked Species:
Ranunculus pacificusG3, S3Occurrences: 3
Tiarella trifoliata var. unifloliata
Range Extensions
Romanzoffia unalaschcensis
One new population (?) on Hitchinbrook Island
USFS Alaska Region Sensitive Species:
4 new populations:
Hawkins IslandPort Fidalgo
Subjectively selected plots revealed no additional taxa or indicated higher than previous average number of taxa per site suggesting randomly selected points may be adequate sample of PWS shorelines
Sampling Adequacy
1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61 65 69 73 77 81 85 89 93 971010
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Sobs (Mao Tau)ICE MeanChao 1 MeanJack 1 Mean
No. sites
No.
spec
ies
Three estimates of species richness indicate at least 83% of PWS shoreline plants were documented
Management ImplicationsPlots in western PWS on average had higher number of taxa per site but had no Alaska Region sensitive species occurrences
Sites where Alaska Region sensitive plant populations were located receive little human use relative to others.
Future Surveys