Main Title |
Influence of Environmental Temperature on Sex-Ratios in the Tidewater Silverside, 'Menidia peninsulae' (Pisces: Atherinidae). |
Author |
Middaugh, D. P. ;
Hemmer, M. J. ;
|
CORP Author |
Environmental Research Lab., Gulf Breeze, FL. |
Year Published |
1987 |
Report Number |
EPA/600/J-87/332; |
Stock Number |
PB88-199435 |
Additional Subjects |
Reproduction(Biology) ;
Marine fishes ;
Estuaries ;
Sampling ;
Ocean temperature ;
Seasonal variations ;
Sex ;
Ratios ;
Females ;
Males ;
Comparison ;
Florida ;
Santa Rosa Island ;
Reprints ;
Menidia peninsulae ;
Tidewater silverside
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB88-199435 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
9p |
Abstract |
The sex-ratios of Menidia peninsulae from Santa Rosa Island, Florida were studied during a 13 month survey. Weekly samples revealed significant deviations from the expected sex-ratio of 1:1. During May-October, young-of-the-year (YOY) females comprised 70 to 94% of the individuals collected in the 32.5 to 62.4 mm SL size class. In contrast, collections of YOY Menidia during November-April yielded 34 to 60% females. These individuals are the presumptive progeny of reproductive activity and sexual differentiation in May-August at warm fluctuating water temperatures of 25.0 to 29.0C. The pattern in sex-ratios of older Menidia 62.5 - 102.4 mm SL paralleled that of YOY individuals. The annual (13 month) sex-ratio for collections of YOY and older Menidia was identical at 68% females. |