The effects of predation by the blue crab, Callinectes sapidus on a macrobenthic infaunal community in Galveston Bay, Texas.

dc.acquisition-srcen_US
dc.call-noQL444.M33 F67 1983en_US
dc.contract-noen_US
dc.contributor.authorFort, E.A.en_US
dc.contributor.otheren_US
dc.date.accessioned2010-02-15T17:36:28Z
dc.date.available2010-02-15T17:36:28Z
dc.date.issued1983en_US
dc.degreeen_US
dc.description128 p., Thesisen_US
dc.description-otheren_US
dc.description.abstractThe importance of macrobenthic predation in regulating distribution and abundance of an infaunal sand community was examined by conducting a series of manipulative field experiments. The effect of the blue crab Callinectes sapidus, was examined by using predator inclusion and exclusion cages. Response to various predation pressures by the infaunal community was seasonal. From July to January the infauna in the noncrab treatment generally responded with a large initial increase in density, primarily due to the opportunistic polychaete, Streblospio benedicti, and a subsequent decrease in diversity. From February to June larval recruitment was responsible for a high species diversity. The effect of crab predation was intermediate between the non-predation treatment and the ambient levels of predation from spring through late fall. Decreasing water temperature sharply curtailed the poikilothermic crab's predatory behavior from late fall to early winter. It is postulated that the relatively smaller sized larvae comprising the majority of the infaunal community from winter through spring rendered other prey items more attractive to omnivorous adult crabs. The infaunal responses to various predation rates suggests that this community is not resource limited and therefore not regulated by competitive interactions for food or space. Severe predation pressures exhibited in part by C. sapidus, from late spring through late fall, as well as other species, combined with abiotic influences appear to regulate community dynamics.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeGalveston Bayen_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/26104
dc.latitudeen_US
dc.locationTAMUG circulating collectionen_US
dc.longitudeen_US
dc.notesen_US
dc.placeCollege Station, Texasen_US
dc.publisherTexas A&M University.en_US
dc.relation.ispartofseries902.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectblue craben_US
dc.subjectCallinectes sapidusen_US
dc.subjectpredationen_US
dc.subjectpolychaetesen_US
dc.subjectStreblospio benedictien_US
dc.subjectcagesen_US
dc.subjectaquatic communitiesen_US
dc.subjectfeeding behavioren_US
dc.subjectenvironmental effectsen_US
dc.titleThe effects of predation by the blue crab, Callinectes sapidus on a macrobenthic infaunal community in Galveston Bay, Texas.en_US
dc.typeBooken_US
dc.universityen_US
dc.vol-issueen_US

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