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Filtering by: Creator Collins, Lee Remove constraint Creator: Collins, Lee Academic Affiliation Zoology Remove constraint Academic Affiliation: Zoology

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  • The effects of an emerging pathogen on amphibian host behaviors and interactions

    Creator:
    Han, Barbara A.
    Abstract:
    Contemporary environmental change encompasses massive biodiversity loss and increasing numbers of emerging diseases worldwide. As part of a global biodiversity crisis, amphibians are disappearing at unprecedented rates. Batrachochytrium dendrobatidis is an emerging infectious pathogen prominently associated with many declines. Chapter 1 reviews the past decade of research on this system...
    Resource Type:
    Dissertation
    Full Text:
    instruction and thoughtful mentorship by Dr. Lee Kats at Pepperdine University. Thank you for giving me

  • Cannibalism in larvae of the long-toed salamander, Ambystoma macrodactylum

    Creator:
    Wildy, Erica Lynn
    Abstract:
    Predator-prey interactions have historically been studied to explain patterns of organization observed in populations and communities. They have also been important in understanding the evolution of antipredator responses in prey and counterstrategies in predators. Despite the breadth of knowledge that exists for heterospecific interactions, relatively few studies have investigated the...
    Resource Type:
    Dissertation
    Full Text:
    cannibalism. Collins and Cheek (1983) found that high conspecific densities promote the production of a

  • Comparative studies of the population ecology and life history patterns of an alkaline salt lake insect : Ephydra (Hydropyrus) hians Say (Diptera:Ephydridae)

    Creator:
    Herbst, David B.
    Abstract:
    Seasonal abundance and life history traits were compared between populations of the brine fly Ephydra (Hydrokyrus) hians Say (Diptera:Ephydridae), from two western Great Basin alkaline salt lakes. Abert Lake, Oregon, has a relatively low salinity (20-30 g/1 total dissolved solids) and more co-inhabitant benthic species than the higher salinity Mono...
    Resource Type:
    Dissertation
    Full Text:
    Bradley, Nick Collins, Gayle Dana, Joe Furnish, John Harris, Eldon Horst, Bob Jellison, Wayne Mathis, Jim

  • The ontogeny and mediation of sexual size dimorphism in the red-spotted garter snake, Thamnophis sirtalis concinnus

    Creator:
    Lerner, Darren T.
    Abstract:
    A wide range of environmental and physiological factors influence the type and extent of sexual dimorphism found in animals. Influential factors include variable climate, competition for resources and mates, mate choice, and parental investment. In addition, some investigators attribute differences in body size to physiological factors influenced by genetic and...
    Resource Type:
    Masters Thesis
    Full Text:
    thank Brian Carter, Kari-Jo Dowdell, Jessie Elisberg, Tony Franklin, Liz Kelly, Ming-Min Lee, Pam

  • The effects of multiple pathogens on amphibians in the Pacific Northwest

    Creator:
    Romansic, John M.
    Abstract:
    The earth is undergoing a “biodiversity crisis” characterized by loss of populations, species, genetic diversity, and ecosystem services. Part of this crisis consists of population declines, extinctions, and increased incidence of deformities in amphibians. It is unknown whether deformities contribute to these declines. Many cases of population declines in amphibians...
    Resource Type:
    Dissertation
    Full Text:
    , Jancovich et al., 2001, Brunner et al., 2004, Collins et al., 2004). In laboratory experiments, ATV has

  • Ecological physiology of the larvel brine fly Ephydra (Hydropyrus) hians, and alkaline-salt lake inhabiting Ephyrid (Diptera)

    Creator:
    Herbst, David B.
    Abstract:
    Dipterans of the family Ephydridae (shore and brine flies) are well known for their ability to tolerate and thrive in a wide variety of physically harsh circumstances. The immature stages of one such species of this family, Ephydra hians, are characteristically limited in distribution as benthic inhabitants of highly alkaline...
    Resource Type:
    Masters Thesis
    Full Text:
    quantitative studies of Collins (1980) provide new insights to the importance of habitat quality and salinity

  • The effects of predation on anuran metamorphosis

    Creator:
    DeVito, Jill
    Abstract:
    Many organisms with complex life cycles undergo transition periods associated with increased vulnerability to predation. Several evolutionary adaptations have been proposed as antipredator defenses for organisms during risky transition periods. These include: shortening of the transition period, parental care, cryptic coloration, and synchrony of risky transitions with large numbers of...
    Resource Type:
    Masters Thesis
    Full Text:
    -authors and I appreciate Lee Kats, Grant Hokit, and John Melville for providing constructive comments on

  • Nasal turbinates and the evolution of mammalian endothermy

    Creator:
    Hillenius, Willem J.
    Abstract:
    Although endothermy is one of the most significant evolutionary developments in the vertebrates, its origins among extinct taxa have traditionally been difficult to determine. Endothermy is primarily an attribute of the "soft anatomy," and its key features, such as complex lungs, elevated blood oxygen carrying capacity and mitochondrial density, do...
    Resource Type:
    Dissertation
    Full Text:
    Schmidt-Nielsen 1964; Collins et al. 1970). Previously, the respiratory turbinates were regarded

  • Pheromonal mediation of reproductive behavior in the brown tree snake

    Creator:
    Greene, Michael John
    Abstract:
    In animals, reproductive behaviors serve to attract individuals together during the breeding season and to coordinate the behavioral and physiological states of individuals so that mating can successfully occur. In snakes, the various reproductive behaviors including courtship, mating, courtship inhibition, male combat and trailing are mediated primarily by pheromones. Pheromones...
    Resource Type:
    Dissertation
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    . Seigel and J. T. Collins 12-15. New York: McGraw-Hill. MacDonald, D. W., D. Muller-Schwarze and S. E

  • All hosts are not created equal : variation in amphibian responses to an emerging fungal pathogen and why it matters

    Creator:
    Gervasi, Stephanie S.
    Abstract:
    Emerging infectious diseases are increasing globally and are a threat to human, wildlife, and ecosystem health. The emerging fungal pathogen, Batrachochytrium dendrobatidis (Bd), or amphibian chytrid fungus, is associated with worldwide amphibian population declines and extinctions. Bd has been found on every continent where amphibians exist and has been documented...
    Resource Type:
    Dissertation
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    (reviewed in Alford & Richards 1999; Blaustein & Kiesecker 2002; Collins & Storfer 2003; Stuart et al