Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Life Sciences
Life History Tactics Of The Sailfin Molly (Poecilia Latipinna) In Contrasting Environments, Helen L. Large
Life History Tactics Of The Sailfin Molly (Poecilia Latipinna) In Contrasting Environments, Helen L. Large
Retrospective Theses and Dissertations
Life history tactics of three Central Florida populations of Poecilia latipinna were compared to those predicted by life history selection theory. The three populations were sampled monthly for one year. At each sampling period a series of physicochemical measurements were taken to determine the degree of spatial and temporal environmental heterogeneity within each site. Life history traits determined for each population included size at maturity, size specific fecundity, reproductive effort, and length, weight, and condition of offspring. The population inhabiting the most variable environment was characterized by smaller size at maturity, lower size specific fecundity, lower overall reproductive output, and …
The Influence Of Somatic Investment On The Patterns Of Reproduction In Poecilia Latipinna (Pisces: Poeciliidae), Jeffrey D. Wetherington
The Influence Of Somatic Investment On The Patterns Of Reproduction In Poecilia Latipinna (Pisces: Poeciliidae), Jeffrey D. Wetherington
Retrospective Theses and Dissertations
In Poecilia latipinna size-specific reproductive and survivorship patterns were correlated with changes in habitat availability. Of the numerous physical, chemical, and biological parameters associated with a reduction in available habitat, probably the most important was reduced food availability. Large (old) females, theoretically with a low reproductive value, allocated energy to reproduction regardless of habitat and, presumably, food availability. When reproductive activities were initiated in March, habitat availability was modest. In association with a severe reduction in available habitat in April, large females were subject to a substantial loss of body weight during the yolk-loading phase of the reproductive cycle. This …
Population Structure And Reproduction In The Introduced Florida Population Of The Pike Killifish, Belonesox Belizanus (Pisces: Poeciliidae), James S. Turner
Population Structure And Reproduction In The Introduced Florida Population Of The Pike Killifish, Belonesox Belizanus (Pisces: Poeciliidae), James S. Turner
Retrospective Theses and Dissertations
The pike killifish, Belonesox belizanus Kner, is the largest member of the live-bearing family Poeciliidae. The species is native to Central America, and was introduced into Dade County, Florida in 1957. B. belizanus is primarily piscivorous, and has been identified as a potential ecological "problem" species for Florida due to its heavy predation on small native fishes, especially the mosquitofish (Gambusia affinis). The population structure and reproduction of the Florida population were investigated in this study from field samples and aquarium observations. The mean standard length (SL) of mature females was about 103 mm. Most females larger than 75 mm …