Experimental studies on selection for vegetative structure by Penaeid shrimp

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dc.acquisition-srcReview of GBNEP-6 reference listen_US
dc.call-noSH 380.62 .U56 M4 1990 GBAYen_US
dc.contract-noen_US
dc.contributor.authorMinello, T.J.en_US
dc.contributor.authorZimmerman, R.J.en_US
dc.contributor.authorBarrick, P.A.en_US
dc.contributor.otheren_US
dc.date.accessioned2010-02-15T17:00:26Z
dc.date.available2010-02-15T17:00:26Z
dc.date.issued1990en_US
dc.degreeen_US
dc.description30 pgs.en_US
dc.description-otheren_US
dc.description.abstractVariability in selection for vegetated habitats by juvenile brown shrimp, Penaeus aztecus, and white shrimp, P. setiferus, as evidenced by distributions in estuaries, suggests that the value of these habitats is not constant. Previous laboratory work indicates that selection for structure itself is one component of habitat selection, but environmental conditions and other habitat characteristics undoubtedly affect the utilization of vegetated estuarine habitats. This study was designed to examine the effect of environmental variables on selection for structure in the laboratory in an effort to increase our understanding of the way habitats are utilized by penaeid shrimp. Brown shrimp are generally found in association with estuarine vegetation, and they selected for vegetative structure in the laboratory. An average of 81% of brown shirmp were distributed in the vegetated half of control tanks. Reductions in salinity to oligohaline levels, used to simulate flood events in estuaries, significantly reduced selection for structure. The reduction of light, either through the manipulation of lighting or through turbidity, had a similar effect on brown shrimp distributions. Neither reduced salinity or light, however, reduced the mean percentage of shrimp in the grass below 50%. The overall presence or absence of food or of an appropriate substrate for burrowing, did not alter selection for structure, but the distribution of these habitat characteristics had a dramatic effect on shrimp distributions. Attraction to food or to a substrate for burrowing can override the inherent selection for structure normally exhibited by brown shrimp. Other variables examined including day length and shrimp size did not significantly affect selection. White shrimp distributions in relation to estuarine vegetation are more variable. In our experiments, white shrimp also showed an inherent selection for the vegetated half of the control tanks (75% of shrimp in the vegetation), but none of our experimental variables appeared to influence this selection to any great extent. There was a strong correlation between white shrmp activity and selection for structure, and this relationship may have contributed to the relatively large variability in selection by this species.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeGalveston Bayen_US
dc.history3/2/05 easen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/20912
dc.latitudeen_US
dc.locationGBIC Circulating Collectionen_US
dc.longitudeen_US
dc.notesen_US
dc.placeGalveston, TXen_US
dc.publisherU.S. National Marine Fisheries Service, Southeast Fisheries Serviceen_US
dc.relation.ispartofseries3102.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesNOAA Tech. Mem. NMFS-SEFC-237en_US
dc.subjectbrown shrimpen_US
dc.subjectwhite shrimpen_US
dc.subjecthabitat selectionen_US
dc.subjecttanksen_US
dc.subjectsalinity effectsen_US
dc.subjectlight variationsen_US
dc.subjectturbidityen_US
dc.subjectPenaeus aztecusen_US
dc.subjectPenaeus setiferusen_US
dc.subjectfood availabilityen_US
dc.subjectestuariesen_US
dc.titleExperimental studies on selection for vegetative structure by Penaeid shrimpen_US
dc.typeBooken_US
dc.universityen_US
dc.vol-issueen_US

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