Dr. Mark Jennings

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  Altadena Foothills Conservancy - [Cached Version]
  Published on: 11/14/2000    Last Visited: 7/10/2001  

  Coast Horned Lizard ( Phrynosoma coronatum ) , possibly subspecies San Diego Horned Lizard ( Phrynosoma coronatum blainvillei ) per discussion with Dr. Mark R. Jennings ( Research Associate with the Department of Herpetology at California Academy of Sciences and Research Fish and Wildlife Biologist with the U.S.G.S ) at the UCLA Institute of the Environment conference , California's Biodiversity Crisis : The Loss of Nature in an Urbanizing World 24 October 1998.
  
  Pacific Slender Salamander ( Batrachoseps pacificus ) and California Slender Salamander ( Batrachoseps attenuatus ) are both found at numerous sites in the Altadena Foothills.

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  California Academy of Sciences - Herpetology Department - [Cached Version]
  Published on: 12/26/2003    Last Visited: 12/26/2003  

  Mark R. Jennings USFWS

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  FINAL RULE: ARROYO SOUTHWESTERN TOAD, U.S. Fish &... - [Cached Version]
  Published on: 11/22/1994    Last Visited: 7/11/2006  

  Most of the new information and analyses came from Dr. Samuel Sweet, University of California, Santa Barbara; Dr. Mark Jennings, California Academy of Sciences; and staff of the Los Padres National Forest.
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  On December 30, 1992, (not January 12, 1993, as indicated in proposed rule (58 FR 41232)) the Service received a petition from Dr. Sweet and Dr. Mark Jennings to list the arroyo toad as endangered (Sweet and Jennings 1992).
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  On December 30, 1992, (not January 12, 1993, as indicated in proposed rule (58 FR 41232)) the Service received a petition from Dr. Sweet and Dr. Mark Jennings to list the arroyo toad as endangered (Sweet and Jennings 1992).
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  A recent report prepared under contract to the California Department of Fish and Game stated that the combination of threats "probably make this taxon the most vulnerable in California" (Jennings and Hayes 1992).In regard to recommendations that more studies are needed before listing the arroyo toad, section 4 of the Act states that a determination to list must be based on the best scientific and commercial data available after conducting a review of the status of the species.
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  Over the past 20 years, at least 60 species of fishes have been introduced to the western U.S. States, 59 percent of which are predatory (Hayes and Jennings 1986; Jennings 1988).The introduction of exotic predators to southern California waters has been facilitated, in part, by the interbasin transport of water (e.g., California Aqueduct).Introduced predators had substantial impacts on the sizes of extant populations of arroyo toads and may have contributed to regional extinctions (Hayes and Jennings 1986).
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  Off-highway vehicle use is believed to be the primary factor responsible for the decimation of the Mojave River population of the arroyo toad (Jennings 1991).

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  INon-native Reptiles and Amphibians Introduced into... - [Cached Version]
  Published on: 5/5/2007    Last Visited: 10/20/2009  

  Most urban lakes contain a number of exotic species of turtles. (Jeff Lemm, in his Field Guide to the Amphibians and Reptiles of the San Diego Region, quotes biologist Mark Jennings, who has extensively surveyed Caifornia for reptiles and amphbians, as stating that ther are "roughly 30 species of exotic turtles found in southern California's waterways, although not all of these are established.

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  Las Vegas Mercury: The celebrated leopard frogs of... - [Cached Version]
  Published on: 8/25/2001    Last Visited: 6/9/2002  

  The initial decline of the relict leopard frog is blamed on the damming of the Colorado River to form Lake Mead in 1935 and Lake Mojave in 1951, which flooded out habitat, disconnected the species' populations from each other and changed hydrologic regimes, says biologist Mark Jennings, a research associate with the department of herpetology at the California Academy of Sciences in San Francisco.The frog is called "relict," however, in reference to being a surviving species from a time when springs were more plentiful, thousands of years ago.Jennings says the frog once occupied 64 sites, according to surveys since the species was first collected in 1872.
  
  Since the frogs' reinstatement among the living in the 1990s, the park has been working on a relict leopard frog recovery plan, says Hoff.And Clark County has listed the relict leopard frog as a "covered species" in its habitat conservation plan (even though the frog occurs only on national park land and so should already be protected from development).That all means that the fragility of the relict leopard frog's existence is acknowledged and, when it comes to development impacts and required mitigation, accounted for.An "endangered" listing might add impetus to these efforts, says Hoff.
  
  "I think it gives Clark County a heads up that somebody's watching them," says Hoff, a biologist who also has worked on the Clark County habitat conservation plan.

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  Live Oak Associates, Inc. - [Cached Version]
  Published on: 10/4/2009    Last Visited: 10/4/2009  

  Mark Jennings, Ph.D. | Senior Associate Ecologist/Herpetologist Live Oak Associates, Inc.
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  Mark Jennings, Ph.D. Senior Associate Ecologist and Herpetologist
  
  Dr. Jennings is a versatile, highly trained ecologist with specialties in both fisheries ecology and herpetology. He has worked extensively with a variety of fishes, reptiles, and amphibians throughout California and is a noted authority on a number of species including the tidewater goby, steelhead, California tiger salamander, red-legged frog, western pond turtle and giant garter snake. As a research associate at the California Academy of Sciences, he completed a 4-year study of the status of third category (species of special concern) amphibians and reptiles in California for the California Department of Fish and Game. The product of this research is the most comprehensive description of the distribution and status of all species of special concern ever produced in the state. This report served as the model for subsequent species of special concern reports for other vertebrate groups, which includes recommendations for changes in listing status as warranted, and for future research.
  
  Dr. Jennings has consulted on more than 500 projects over the last 10 years throughout California. As an Associate Ecologist for LOA, he has assisted on numerous projects regarding the California red-legged frog (more than a dozen ongoing projects in the Bay Area), California tiger salamander, western pond turtle, San Francisco garter snake, and Alameda whipsnake.
  
  Dr. Jennings has held a research position as a fish biologist with the U. S. Fish and Wildlife Service, National Fisheries Contaminant Research Center, Dixon, California. His research efforts concentrated on the effects of selenium on fisheries of the San Joaquin Valley, California. He supervised both field and laboratory studies.
  
  Dr. Jennings is certified as a fisheries scientist and has conducted a variety of studies prior to his work with the Fish and Wildlife Service. Included in these surveys were stream surveys in Pima County, Arizona, an assessment of impacts of dredge mining on streams, the effects of fire on fish populations, and an assessment of anadromous fish stocks in the Clearwater River, Idaho. He has taught an upper division fisheries course and assisted in several laboratory courses.
  
  Since 1980, Dr. Jennings has published over 75 scientific papers in the field of ichthyology and herpetology. He is currently working on a major study of the tidewater goby for the California Department of Transportation.

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  Live Oak Associates, Inc. - [Cached Version]
  Published on: 10/4/2009    Last Visited: 10/4/2009  

  Mark Jennings, Ph.D. >>> Senior Associate Ecologist/Herpetologist

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  MINUTES - FEBRUARY 18, 1997 - [Cached Version]
  Published on: 8/14/2009    Last Visited: 8/14/2009  

  The General Manager explained that the Operations and Monitoring Plan for Fox and Alder Creeks was reviewed by the District’s biologist consultant, Jean Baldrige, at no charge and by Mark Jennings, a herpetologist and an expert on red-legged frogs.

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  Natural History Magazine | Feature - [Cached Version]
  Published on: 6/1/2004    Last Visited: 6/24/2009  

  To appreciate what kinds of stresses must be considered, take the case of the California red-legged frog (Rana aurora draytonii), as documented by Mark R. Jennings, a herpetologist at the National Biological Service in San Simeon, California, and Marc P. Hayes, a herpetologist at the Washington Department of Fish and Wildlife in Olympia.

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  The Pinnacle - [Cached Version]
  Published on: 4/23/2006    Last Visited: 4/23/2006  

  Hayes and his associate, scientist Mark Jennings of Davis, are considered among naturalists and frog aficionados as the "gurus of frogs," the world's top experts on the state's red-legged and Northern varieties.

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