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• W822790005 abstract "s of the 73 Annual Meeting of the Florida Academy of Sciences, in conjunction with the Tampa Bay Section of the American Chemical Society Saint Leo University, Saint Leo, Florida 20-21 March 2009 Copyright © 2009 Florida Academy of Sciences. All rights reserved resource use within populations of Florida marine fishes. It also tests the hypothesis that change in the growth of key feeding muscles and bones is induced by feeding on different prey types. Fishes that exploit clams, crabs, and other hard-shelled invertebrates as food have more robust feeding bones and muscles, as well as higher jaw-mechanical advantage. In contrast, fishes that eat polychaetes and other soft-bodied prey, as well as seagrass and fleshy algae have smaller feeding muscles and bones relative to their durophagous conspecifics. A diet-rearing experiment confirmed that the development of robust feeding bones and muscles is enhanced by durophagy. Results of these studies underscore the importance of intraspecific ecomorphological variation in shaping phenotypic diversity in Florida coastal-marine fishes. BIO-11 Stage-specific effects of temperature on the feeding behavior of the invasive Pike Killifish in Florida. J.R. KERFOOT and R.G. TURINGAN. Department of Biology, Florida Institute of Technology, 150 W. Univ. Blvd., Melbourne, FL 32901. The ability of an invasive fish to utilize an available food resource influences its growth and subsequent survival in an invaded ecosystem. It is hypothesized that feeding is affected by ambient temperature. This is the first study to investigate the effect of temperature on the prey-capture kinematics through ontogeny in an invasive species. It addresses two questions: (1) Does temperature influence the feeding behavior and prey-capture kinematics of the invasive pike killifish, Belonesox belizanus? and (2) Does the effect of temperature in this species vary through ontogeny? To address these questions, three individuals in each size class, neonate ( 55 mm) and adults [> 55 mm SL]) were filmed in 45 L experimental tanks feeding on adult Artemia sp. or Gambusia holbrooki at two different temperature regimes, 20°C and 30°C. Each individual was filmed three times at each temperature, yielding 54 films analyzed. Prey-capture velocity, peak gape velocity, and Q10 were compared among life-history stages using ANOVA. At both temperature regimes, juveniles significantly finished their feeding bout (i.e., greatest prey-capture velocity) and reached peak gape fastest relative to the neonates and adults. The Q10 values were 1.167-1.342 for prey-capture velocity and 1.247-1.425 for peak gape velocity, but were not significantly different among life-history stages. Results reveal that the effect of temperature on prey-capture kinematics and feeding behavior is stage-specific. This study suggests that in examining how temperature influences the rate and range of spread of an exotic species in Florida one must address the different stages in the life history of the target species. BIO-12 Gastrointestinal parasites of selected tropical pelagic elasmobranchs and mesopelagic teleosts. M. TAYLOR (1), H. LAUBACH (2), and D.W. KERSTETTER (1). (1) Nova Southeastern University Oceanographic Center 8000 North Ocean Drive Dania Beach, FL 33004, (2) College of Medical Sciences, 3200 South University Drive, Ft. Lauderdale, FL 33328. Natural mortality is a poorly known aspect of fisheries biology, despite its importance in stock assessments and population analysis. Of the many potential sources of mortality and morbidity in fishes, the effects of gastrointestinal parasites is perhaps the least studied. Parasite loads in the elasmobranch spiral valve and teleost fish gastrointestinal tract may both inhibit nutrient uptake and stimulate an inflammatory response in the host. The gastrointestinal parasites of several tropical pelagic elasmobranchs including dusky, silky, and night sharks (Carcharhinus obscurus, C. falciformis, and C. signatus), the pelagic stingray (Pteroplatytrygon violacea) and the mesopelagic fishes snake mackerel (Gempylus serpens), oilfish (Ruvettus pretiosus), and escolar (Lepidocybium flavobrunneum) are described from the South Atlantic Bight in the western North Atlantic. Species found to date include nematodes, trematodes and cestodes, and their potential transmission vectors are being explored. Total gastrointestinal parasite loads are compared against the size (length and weight) of the host, showing no relationship for pelagic elasmobranchs and only a weak relationship for mesopelagic teleosts. To date, 60 elasmobranch specimens have been sampled with a yield of approximately five parasites and approximately 20 mesopelagic teleosts have been sampled, yielding approximately 80 total parasites, the majority being nematodes. BIO-13 Use of pop-up satellite archival tags to determine habitat utilization of sailfish (Istiophorus platypterus) in the southern Gulf of Mexico. D.W. KERSTETTER. Nova Southeastern University Oceanographic Center, 8000 N. Ocean Dr., Dania Beach, FL 33004. To determine habitat utilization of sailfish in the southern Gulf of Mexico and Florida Straits, 18 pop-up satellite archival tags were deployed on animals incidentally captured during regular commercial pelagic longline fishing operations targeting swordfish and tunas. Tags were programmed for a 10-day deployment period, with point measurements of depth, temperature, and light level every 90 seconds. A total of 17 tags transmitted following the full deployment period, transmitting 25-82% of the archived data; three tags were also physically returned, allowing for 100% recovery of the archived data. The data recorded by the tags showed repeated short-duration movements throughout the deployment period to depths greater than 75 m for less than five minutes each, presumably for feeding. Diel differences in depth distributions and individual movement patterns are examined, including differences in habitat utilization in relation to the local mixed layer depth. The maximum depths of the short-duration movements are also well below the measured" @default.
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• W822790005 date "2009-01-01" @default.
• W822790005 modified "2023-09-27" @default.
• W822790005 title "Use of Pop-Up Satellite Archival Tags to Determine Habitat utilization of sailfish (Istiophorus platypterus) in the Southern Gulf of Mexico." @default.
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