Reptiles and Amphibians of Griffith Park
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Transcript of Reptiles and Amphibians of Griffith Park
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Griffith Park Reptilesand Amphibians
Daniel S. CooperCooper Ecological Monitoring, Inc.Los Angeles, [email protected]
February 2010
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Why do we care?
Reptiles/Amphibians are integral parts of nature
Many are indicators of ecological integrity
Knowledge of natural systems brings understanding of earth, our relationship to earth
Understanding enriches our lives, like art, music, food, etc.; otherwise,why have more than one kind of anything?
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Herptile diversity of Santa Monica Mountains
Entire range (n = 31)Newts/Salamanders (5)Frogs/Toads (4)Turtles (1)Lizards (7)Snakes (14)
Source: “Reptile and Amphibian Checklist for the Santa Monica Mtns. NRA” (undated)
In eastern Santa Monica Mtns. (n = 21)
Salamanders (4)Frogs/Toads (2)Lizards (6)Snakes (9) Source: Delisle et al. 1986
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History of investigation into Griffith Park reptiles and amphibians
Earliest known collection (1911):
CAS 33184,5 Aneides lugubris “Arboreal Salamander” (2) CAS 33151-83 Batrachoseps nigriventris “Black-bellied Slender- salamander” (33)CAS 33186 Ensatina eschscholtzii “Monterey Salamander” (aka Ensatina)
Collector: E.C. Van Dyke Location: “On hills in Griffith Park”
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Griffith Park reptile and amphibian specimens known from museum collections (16 spp.)
(as of 2009; most recent specimen: 1976)
Aneides lugubris Arboreal Salamander (4)Anniella pulchra Calif. Legless Lizard (2)Batrachoseps nigriventris/attenuatus Black-bellied Slender-salamander (66)Batrachoseps major/pacificus Garden Slender-salamander (2)Ensatina eschscholtzii Monterey Salamander/Ensatina (2)Hyla regilla Pacific Treefrog (1)Bufo boreas Western Toad (2)
Elgaria multicarinata Southern Alligator Lizard (2)Sceloporus occidentalis Western Fence-lizard (1)Uta stansburiana Side-blotched Lizard (1) Diadophus punctatus Ringneck Snake (2)Lampropeltis zonata Southern Calif. Mountain Kingsnake (1)Masticophus lateralis Striped Racer (2)Pituophis catenifer Gopher Snake (2)Salvadora hexalepis Coast Patchnose Snake (2)Thamnophis hammondii Two-striped Garter Snake (1)
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History of investigation into Griffith Parkreptiles and amphibians
Only comprehensive publication: DeLisle et al. 1986“The Distribution and Present Status of the Herpetofauna of the Santa Monica Mountains of Los Angeles and Ventura Counties, California. Special publication No. 2 of the Southwestern Herpetoloist Soc., Dec. 1986”
DeLisle listedjust five species listed as specifically occurring in Park (ignored specimen data):
Western Fence-lizardSide-blotched lizardSouthern alligator lizardSilvery legless lizardCalifornia striped racer
This lack of information has contributed to historically low appreciation of park as natural area.
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History of investigation into Griffith Parkreptiles and amphibians
“The Postfire Era”
Postfire Recovery Team convened after 2007 fire, which burned 800 acres.
Wildlife Team led by Daniel S. Cooper, Cooper Ecological Monitoring, Inc.
In partnership with USGS, initiated herptile surveys of Griffith Park in spring 2008, continuing through summer 2009.
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Goals and Methods
How much of original species diversity is left?
What habitats are/were important for which species?
• Year-long trapping study (w/ USGS)• Opportunistic searches (after rain, on hot days)• Conversation/communication with rangers/hikers
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2008 - 2009 Trapping
Drift fencing
Bucket
Snake trap
Opened/checked for 5 days every 4-6 weeks
“Herptile Array”
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2008 - 2009 TrappingFive “arrays” placed in the park at Brush
Canyon (3), Royce Canyon (1) and Oak Canyon (1).
5-day trapping sessions in Apr., May, June, Aug. and Oct. 2008; Feb., Apr., May and July 2009
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What have we found? - Salamanders
Species Traps Searches Other (recent)
Arboreal Salamander 0 1 (juvenile, Spring Cyn.)
0
Slender-Salamander sp. (TBD)
0 10+ 0
Monterey Ensatina 1 (adult, Brush Cyn.)
0 0
Western Toad 26 0 Sightings, photos
Pacific Treefrog 0 Many SightingsNo known records of California Newt, California Treefrogor Calif. Red-legged Frog (ever)
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What have we found? - Lizards
Species Traps Searches Other (recent)
California Legless Lizard
0 0 0
Western Fence-lizard 32 100s Sightings, photos
Southern Alligator Lizard
32 5+ Sightings, photos
Coast Horned Lizard 0 3 (adj. to GP)
Sightings, photos
Side-blotched Lizard 0 0 0
Western Skink 1 1 Mathewson et al. 2008
Coastal Western Whiptail
3 10s Sightings, photos
No known records of Western Pond-Turtle
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What have we found? - Snakes
Species Traps Searches Other (recent)
Ringneck Snake 3 0 Sightings, photos
California Kingsnake 0 0 Photo (2007)
Striped Racer 6 5+ Sightings, photos
Gopher Snake 1 0 Sightings, photos
Two-striped Garter Snake
0 0 1991 specimen from L.A. River
Western Rattlesnake 4 5+ Sightings, photos
Rosy Boa 0 0 1 captured 1990s
No records of Yellow-bellied Racer, Night Snake, Coachwhip, Black-headed Snake, Lyre Snake, Western Blind Snake
No modern records of So. Calif. Mountain Kingsnake or Coast Patchnose Snake
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Most Common…
Western Fence-lizard Sceloporus occidentalis
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Most Common…
Southern Alligator Lizard Elgaria multicarinata
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Most Common…
Western Toad Bufo boreas
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Most Common…
Striped racer Masticophis lateralis
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Most Common…
Western Rattlesnake Crotalis viridis
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Most Common…
Pacific Treefrog Hyla regilla
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Specialized species…sandy/gravelly soil in open scrub, ridgetops
Western Whiptail Cnemidophorus tigris
Coast Horned Lizard Phrynosoma coronatum
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Specialized species…oak-sycamore woodland (part I)
Ringneck Snake Diadophus punctatusSlender-salamander sp. Batrachoseps sp.
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Specialized species…oak-sycamore woodland (part II)
Monterey Ensatina Ensatina eschscholtziii
Arboreal Salamander Aneides lugubris
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Probably common (but few records)
California Kingsnake Lampropeltis getula
Western Skink Eumeces skiltonianus
Gopher Snake Pituophis catenifer(upper right)
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Biggest mysteries (clockwise from upper left, next slide):
Southern Calif. Mountain Kingsnake Lampropeltis zonata
Old specimens; unconfirmed recent sightings; now rare in entire Santa Monica Mtns., but to be looked for in rocky areas, at outcrops or along stream.
California Legless Lizard Anniella pulchraOld specimens; unconfirmed sightings from adj.
properties; persists even in urbanized areas of L.A.
Two-striped Garter Snake Thamnophis hammondii1991 specimen from cement-sided Los Angeles
River vic. Glendale; possibly persists along LAR.
Rosy Boa Lichanura trivirgataSpecimen captured by L.A. Zoo staff along
northwestern edge of park, at rocky outcrop; only known record for SM Mtns.(?)
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?
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Considered Extirpated in Griffith Park(unless we learn otherwise!)
Side-blotched Lizard Uta stansburiana
Coast Patchnose SnakeSalvadora hexalepis
Both still persist in Verdugo, San Gabriel Mtns.
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Thanks!
City of Los Angeles, Dept. of Recreation and Parks (including Albert Torres, Chief Ranger)
Franklin Hills Residents AssociationGreater Griffith Park Neighborhood CouncilSierra Club - Verdugo Hills Chapter