Biogeographic Patterns, Predator Identity, and Chemical Signals Influence the Occurrence and Magnitude of Non-lethal Predator Effects

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dc.contributorSmee, Delbert L.
dc.creatorLarge, Scott Isaac
dc.date.accessioned2011-10-21T22:04:04Z
dc.date.accessioned2011-10-22T07:12:45Z
dc.date.accessioned2017-04-07T19:58:51Z
dc.date.available2011-10-21T22:04:04Z
dc.date.available2011-10-22T07:12:45Z
dc.date.available2017-04-07T19:58:51Z
dc.date.created2011-08
dc.date.issued2011-10-21
dc.description.abstractPredators can have large effects on prey populations and on the structure and function of communities. In addition to direct consumption of prey, predators often cause prey to alter their foraging behavior, habitat selection, and morphology. These non-lethal effects of predators can propagate to multiple trophic levels and often exert equal or larger effects upon communities than those of direct consumption. For non-lethal predatory effects to occur, prey must detect and respond to predation risk. While the importance of information transfer in this process has been realized, few studies explore how prey responses are influenced by predator characteristics and environmental conditions that influence the transmission of cues indicative of predation risk. In this dissertation I investigate factors that influence how a single prey species evaluates and responds to predation risk. Here, I examined: 1) the type and nature of cues prey use to evaluate predator risk; 2) how predator identity, predator diet, and the relative risk of predators influence prey response to predation risk; 3) how hydrodynamic conditions influence the delivery of predator cues; 4) how biogeographic trends in predator distribution influence prey response to predation risk; and 5) how genetic structure might vary according to prey geographic location and habitat. To address these questions, I used a common intertidal model system consisting of the rocky intertidal whelk Nucella lapillus (Linnaeus, 1758) and a suite of its predators, the native rock crab Cancer irroratus (Say, 1817), Jonah crab Cancer borealis (Stimpson, 1859), and the invasive green crab Carcinus maenas (Linnaeus, 1758). Nucella use chemical cues emanating from their most common predator (Carcinus maenas) and crushed conspecifics to evaluate predation risk. Nucella from different habitats experience different levels of predation risk, and Nucella from habitats with high levels of predation had larger antipredatory responses to predator risk cues than Nucella that experienced less predation. These chemical cues indicative of predation risk are influenced by hydrodynamic conditions, and Nucella have the strongest anti-predatory response in flow velocities of u= ~4- 8 cm s^-1. Furthermore, Nucella from geographic regions where green crabs are historically absent did not elicit anti-predatory responses, while Nucella from regions where green crabs are common frequently responded. Findings from my dissertation research demonstrate that prey detection and response to predation risk is highly dependent upon predator identity, predator diet, environmental forces, and biogeographic patterns in predator and prey distributions.
dc.identifier.urihttp://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10231
dc.language.isoen_US
dc.subjectCarcinus maenas
dc.subjectNucella lapillus
dc.subjectChemical cue
dc.subjectChemical ecology
dc.subjectNonlethal predator effect
dc.subjectPredator?prey interaction
dc.subjectPredator diet
dc.subjectPrey behavior
dc.subjectDogwhelk
dc.subjectGreen crab
dc.subjectHydrodynamics
dc.subjectIntermediate consumer
dc.subjectNon-consumptive predator effect
dc.subjectPredator avoidance behavior
dc.subjectMicrosatellite
dc.subjectBiogeography
dc.subjectCancer irroratus
dc.subjectCancer borealis
dc.subjectJonah crab
dc.subjectRock crab
dc.titleBiogeographic Patterns, Predator Identity, and Chemical Signals Influence the Occurrence and Magnitude of Non-lethal Predator Effects
dc.typeThesis

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