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Estimation Of Fishing Tournament Mortality And Its Sampling Variance, Gene R. Wilde, Kevin L. Pope, Richard E. Strauss
Estimation Of Fishing Tournament Mortality And Its Sampling Variance, Gene R. Wilde, Kevin L. Pope, Richard E. Strauss
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
The mortality of fish captured in fishing tournaments has commonly been estimated incorrectly and, thus far, only one account has presented an estimate of the standard error or confidence interval for tournament-associated mortality. In this article we describe methods for estimating the initial, delayed, and total mortality of tournament-caught fish and provide formulae for estimating the sampling variances of these estimates. The absence of such estimates from previous studies may explain an observed lack of change in tournament-associated mortality between the 1980s and the 1990s. Our methods provide insight into the design of studies of tournament-associated mortality and suggest, for …
Yellow Jackets May Be An Underestimated Component Of An Ant-Seed Mutualism, Megan T. Bale, Jennifer A. Zettler, Bradford A. Robinson, Timothy P. Spira, Craig R. Allen
Yellow Jackets May Be An Underestimated Component Of An Ant-Seed Mutualism, Megan T. Bale, Jennifer A. Zettler, Bradford A. Robinson, Timothy P. Spira, Craig R. Allen
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Yellow jackets (Hymenoptera: Vespidae) are attracted to the typically ant-dispersed seeds of trilliums and will take seeds from ants in the genus Aphaeogaster. To determine if yellow jacket, Vespulla maculifrons (Buysson), presence interferes with seed foraging by ants, we presented seeds of Trillium discolor Wray to three species (A. texana carolinesis Wheeler, Formica schaufussi Mayr, and Solenopsis invicta Buren) of seed-carrying ants in areas where vespids were present or excluded. We found that interspecific aggression between yellow jackets and ants is species specific. Vespid presence decreased average foraging time and increased foraging efficiency of two of the three …
Importance Of Food Ration And Water Temperature On Growth Of Juvenile Green Sunfish (Lepomis Cyanellus), Christopher J. Chizinski, Kevin L. Pope
Importance Of Food Ration And Water Temperature On Growth Of Juvenile Green Sunfish (Lepomis Cyanellus), Christopher J. Chizinski, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
A randomized design was used to test the difference in growth rates of juvenile green sunfish (Lepomis cyanellus) subjected to three treatments (food ration, temperature and salinity). Food ration and water temperature were similarly important in affecting growth of juvenile green sunfish. Juvenile green sunfish were found to accomplish similar growth with scarce food and optimum temperature as with abundant food and sub-optimum temperature. This equal and independent relation to biotic and abiotic factors should be expected in a ubiquitous generalist species, such as green sunfish.