Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"antipredator"”.
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Morphological antipredator adaptations in water fleas
… the ability to develop extreme morphological antipredator defences, such as long antennules, high carapaces and helmets. The relative sizes of these plastic traits may differ substantially between populations, and also between individuals within a population, between sexes and during ontogeny. …
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EARLY-LIFE DEVELOPMENT OF ANTIPREDATOR BEHAVIOUR OF JUVENILE NORTHERN CRAYFISH (FAXONIUS VIRILIS)
… alarm cues, to assess predation risk and guide antipredator responses. Early exposure to risk-related cues can influence the development of antipredator strategies, including generalized responses to novelty (neophobia) and the ability to learn predator recognition through associative …
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Costs and benefits of Daphnia antipredator behavior and consequences on community stability
… energy flow caused by costs and benefits of antipredator defenses and to study their implications for community stability, I used the planktivorous fish - Chaoborus - Daphnia system. In the laboratory, I found that clonal variance of Daphnia antipredator defenses was high, and that …
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Multi-component chemical defense in seahares (Gastropoda:Opisthobranchia): antipredator compounds act as both honest and deceptive signals to multiple predator species
… negative bacteria. Escapin is the first reported antipredator protein of any organism.Ink and opaline protected seahares against crustaceans in a different and unusual way---by stimulating them to feed. Opaline was as stimulatory as homogenates of squid and shrimp in behavioral studies and …
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HIDE AND SEEK: AN EXPLORATION OF ANTIPREDATOR AND PREDATOR AVOIDANCE MECHANISMS IN ORTHOPODOMYIA SIGNIFERA IN RESPONSE TO PREDATION FROM TOXORHYNCHITES RUTILUS
<p>There have been many observations of larval <em>Orthopodomyia signifera</em> coexisting with the predator <em>Toxorhynchites rutilus.</em> There are three hypotheses that could explain how <em>Or. signifera</em> resists predation from <em>Tx. rutilus</em>. The first hypothesis states that larvae …
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Inducible Chemical Defenses in Temperate Reef Sponges of the South Atlantic Bight, U.S.A.
… and Aplysina fulva. First, concentrations of antipredator compounds should covary with the abundance of sponge predators. Second, higher compound concentrations should be more effective at deterring predators. Secondary metabolite concentrations in two (I. campana and I. felix) of the sponge …
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Variation in Behavior of Different Populations and Sex Classes of Paedomorphic Oklahoma Salamanders
… in Missouri and Oklahoma to determine whether antipredator behavior, swimming speed, activity, and proximity to cover were influenced by sex, reproductive condition, or population of origin. The two populations differed in several respects, with individuals from the Missouri population being …
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The Effects Of Acidic Conditions And Tannins On The Survival, Development, And Behavior Of Cope’s Gray Treefrog (Hyla Chrysoscelis)
… tannic conditions to investigate survival and antipredator behaviors. I found that female oviposition site choice did not correspond with conditions that maximize offspring survival. Tadpole mortality was highest in tannic treatments, yet tannic treatments received a high proportion of eggs in …
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Social learning and its effect on conservation efforts in the Barrens Topminnow: an evaluation of conditioning and social learning as a viable longterm solution to evolutionary traps
… I 1) attempted to condition BTMs to exhibit antipredator behavior when faced with WMF, and 2) created a situation in which naive BTMs could potentially learn from conditioned individuals. I found no evidence of conditioning or of social learning, and there were no significant differences in …
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Behavioral and Hormonal Flexibility Across Light Environments in Guppies (Poecilia reticulata)
… behavioral situation (e.g., correlations between antipredator behaviors in different habitats), or across behavioral contexts (e.g., correlations among feeding, antipredator, or mating behavior) (Sih et al. 2004a). Guppies (Poecilia reticulata) provide a great model system to study behavior. …
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Behavioral and Metabolic Responses of Juvenile Spotted Salamanders (Ambystoma Maculatum) to Alarm Cues from Damaged Skin and Predator Diet
… level of predation risk and perform appropriate antipredator behaviors when predation risk is high. I investigated the ability of lab-reared juvenile spotted salamanders, Ambystoma maculatum, to assess predation risk via chemical alarm cues and substrate markings from predators fed different …
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Local Variation in the Chemical Defence of European Pine Sawfly (Neodiprion sertifer): Effects of Host Tree Chemistry and Social Environment
… resinous acids from the host plant for its antipredator defence. It is also a social insect that feeds and defends cooperatively in a group during the larval stage. In this master’s thesis, I studied the variation in chemical defences from three different natural populations of N. sertifer …
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Behavioral Responses By Cottonmouths (Agkistrodon Piscivorus) To Chemical And Visual Predator Cues
… (Agkistrodon piscivorus) exhibit an array of antipredatory behaviors that have been thoroughly characterized in response to human aggressors, but their responses to cues from other predators are poorly known. I conducted three experiments to evaluate cottonmouth responses to visual and …
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Driving giants: spatial and temporal variables influencing giraffe movements in a private protected area
… strategies. The fear of predation prompts antipredator responses in prey which include vigilance behavior, grouping, and shifts in habitat selection. However, these responses may incur costs, impacting energy expenditure of prey and time allocation of prey activities such as foraging, …
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Moths fight back: arms race in the cloud forest
… at our field site, but we believe that similar antipredator mechanisms are widespread among tiger moths, and may also be found in other families of moths that have tympanic organs.
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Variation in Defensive Behaviors of the Western Cottonmouth (Agkistrodon Piscivorus) as a Result of Temperature, Size, and Reproductive Condition
… finally, picked up to evaluate variation in the antipredator behavior of A. piscivorus as a function of temperature, body size, reproductive condition, and stimulus presentation sequence. Variation in antipredatory behavior was usually more apparent in active responses (bites and strikes) than …
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Predator Recognition and Avoidance in the San Marcos Salamander
… excessive responses to predators costly. Thus, antipredator behaviors of prey are often the result of complex interactions of effectiveness and efficiency. The San Marcos salamander (Eurycea nana) is a fully aquatic salamander endemic to the headwaters of the San Marcos River. Eurycea nana is …
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Mothers transfer information via eggs: effect of mothers' experience with predators on offspring
… the fry were measured. Shoaling behavior, an antipredator response, was measured from photographs, and was estimated as the nearest neighbor distance between individuals in each tank. Experimental females shoaled more tightly together prior to a mild disturbance. Both control and experimental …
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Movement and energetics of swimming marine mollusks
… as heightened metabolic rates and weakened antipredator responses, suggesting prolonged and potential population-level impacts on a key fishery. This thesis provides new insight in marine invertebrate movement ecology and eco-physiology, demonstrating the utility of coupling biologging and …
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