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The following schedule is subject to change (as of October 11, 2016). Please check back for updates. For more information about this meeting, go to: www.seafwa.org/conferences/2016
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Monday, October 17 • 3:40pm - 4:00pm
Fisheries. Analyzing Capture and Genetic Data Together to Estimate Population Size of Endangered Smalltooth Sawfish (Pristis pectinata)

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AUTHORS: Kelcee L. Smith, Louisiana State University; Dr. John K. Carlson, NOAA Fisheries Service-Southeast Fisheries Science Center; Dana M. Bethea, NOAA Fisheries Service-Southeast Fisheries Science Center; Dr. Michael Kaller, Louisiana State University; Dr. William Kelso, Louisiana State University; Dr. Sabrina Taylor, Louisiana State University

ABSTRACT: A fundamental parameter in mathematical models that underpin ecological, conservation, and evolutionary theory is population size. It can be estimated as census size (NC), i.e. the number of individuals in a population, or effective population size (NE), which only counts individuals contributing genes to future generations. Estimating both NC and NE allows for a better understanding of potential demographic, environmental, and genetic risks that populations face. However, both methods are rarely used together to examine both components of population size. Here, we compare NC and NE estimates for a juvenile population of endangered Smalltooth Sawfish, Pristis pectinata, in Southwestern Florida, U.S. Capture-mark-recapture data (2000-2015) were analyzed in program MARK to estimate NC with recapture probabilities and apparent survival from individual capture histories, assuming a closed population. Models with time dependent capture probability and constant recapture probability estimated an NC of 385 juveniles per year. To estimate NE, small tissue samples (n = 375) taken from captured individuals were genotyped at 18 microsatellite loci. Estimates of NE included temporal, linkage disequilibrium, and sibship methods. Overall, NC can be evaluated with genetic tools, like NE, to determine effects of harvest, environmental change, or species fitness. Monitoring imperiled species in this way can reveal specific issues not evident in estimates of NC that can be addressed to facilitate recovery.

Monday October 17, 2016 3:40pm - 4:00pm
Riverview A

Attendees (8)