Life Sciences Commons^™

The Hold-Release Mechanism In The Family Crotalidae, Ronald K. Easter

Masters Theses

Strike/release vs. strike/hold feeding behavior was observed for 5 Crotalus atrox and 5 Agkistrodon piscivorous. Two sizes of warm blooded prey were offered to the rattlesnakes on alternate weeks. Cottonmouths were offered, alternately, fish or mice of equal size. Although data varied among individual subjects, cottonmouths offered fish demonstrated the strike/hold behavior significantly more often than the strike/release behavior; cottonmouths offered mice struck and released significantly more often than they struck and held. It is concluded that the strike/hold strategy in sreponse to fish is adventageous because the danger of holding such prey is minimal and the release of …

Mating Behavior Of The Giant Waterbug Belostoma Flumineum Say, Janet E. Ruppert

Masters Theses

Sexual selection theory predicts that in the few species where males make a larger parental investment than females and limit female reproduction, females should court and compete for males (i.e. we should observe "sex-role reversal"--Trivers, 1972). These predictions were tested in the laboratory with the giant waterbug Belostoma flumineum Say (Hemiptera: Belostomatidae) . Males of this species characteristically carry and brood eggs on their dorsa, thus making a substantial parental investment.

The courtship sequence in "one male:one female" pairings began with the male "pumping" (rapidly raising and lowering his abdomen at the water's surface). This presumably attracted the female, …