Diet and Divergence of Introduced Smallmouth Bass, Micropterus Dolomieu, Populations

7760 15 5101 2 12861 document 5101 IR-05-082.pdf application/pdf ed71feb3d8661e0dac6487e53db2b5d3 MD5 262266 2016-01-15 02:18:31 https://pure.iiasa.ac.at/id/eprint/7760/1/IR-05-082.pdf 7760 1 1 text en public

IR-05-082.pdf

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IR-05-082.pdf

http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/5101 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/5101 http://eprints.org/relation/isCoversheetVersionOf https://pure.iiasa.ac.at/id/document/5101 archive 351 disk0/00/00/77/60 2016-01-15 02:18:31 2021-08-27 17:19:12 2016-01-15 02:18:31 monograph show 3 Dunlop E.S. 8093 Orendorff J.A. Shuter B.J. Rodd F.H. Ridgway M.S. Diet and Divergence of Introduced Smallmouth Bass, Micropterus Dolomieu, Populations pub iis_ecl prog_adn We examine the degree and causes of divergence in growth and reproduction in two populations of smallmouth bass (Micropterus dolomieu) introduced a century ago. Despite a common source, the Provoking Lake population now has a higher population density and slower growing individuals than the Opeongo Lake population. Using this system, we test the predictions of life history theory that delayed maturation and reduced reproductive investment are expected in high density populations with slow individual growth rates. Observations on both populations run directly counter to the aforementioned expectations. Instead, Provoking males have smaller sizes/younger ages at nesting and higher gonad masses than Opeongo males; Provoking females have smaller sizes at maturity, larger egg sizes, and higher ovarian dry masses than Opeongo females. Temperature, food availability, diet ontogeny, newborn mortality, and adult mortality were examined as plausible contributors to the divergence. Results suggest that low food availability, likely caused or mediated by intra-specific competition for prey, and lack of large-sized prey in the diet are contributing to the slow growth, increased reproductive investment, and higher mortality following reproduction in Provoking. This study provides insight into the processes that produce rapid divergence of life history in a species exhibiting parental care. 2005-12 published IR-05-082 IR-05-082 1224 public interim_report IIASA, Laxenburg, Austria 52 FALSE info:eu-repo/semantics/book