VIDAL, A.G.; CAIN, S.D.; Friday Harbor Labs, Univ. of Washington; Friday Harbor Labs, Univ. of Washington: Isolation of magnetic particles from the tissue of the sea slug, Tritonia diomedea Several animals have been shown to orient using the Earth’s magnetic field. The sensory mechanisms underlying this ability, however, have not been determined. One proposed theory […]

TEMPLE, S.E.*; HAIMBERGER, T.J.; HAWRYSHYN, C.W.; Univ. of Victoria: Investigations into the functional significance of the visual pigment shift in coho salmon (Oncorhynchus kisutch) Chromophores are the light absorbing molecules found in the visual pigments of the photoreceptor cells that begin visual transduction when isomerized by incoming light. The primary chromophore in most vertebrates is […]

COLLIN, R; STRI, Panama: Interspecific comparisons of size, sex and sex change in Crepidula The size advantage hypothesis predicts that the optimal size at sex change for each individual is a function of the size and sex of each animal�s potential mates. In species that form small mating groups, variation in group composition may result […]

YAGER, D.D.; Univ. of Maryland, College Park: Information transformation by an auditory interneuron in the high-speed bat evasion of a praying mantis. Many praying mantises have sensitive ultrasonic hearing. Afferent neurons carry information from the single, midline ear to the metathoracic gangion. There they connect to several bilaterally symmetrical pairs of auditory interneurons. One of […]

PARRIE, Lindsay; TOWLE, David W.; Mt. Desert Island Biol. Lab., Salsbury Cove, ME: Induction of Na++K+-ATPase α-subunit mRNA in branchial tissues of the American lobster Homarus americanus. Lobsters of the genus Homarus are capable of osmoregulating in salinities as low as 15-20 ppt. Investigations on branchial chamber tissues of the European lobster Homarus gammarus suggest […]

BRANDT, Y.; ALLEN, J.R.; Indiana University, Bloomington; University of Colorado, Boulder: Individual Distinctiveness of Pushup Displays Individual recognition modifies many social interactions, like aggression, territoriality, and sexual behaviors. Neighbor-stranger discrimination is known in several lizard species, but the signals that allow lizards to recognize social partners remain unknown. Any signal that promotes recognition must be […]

WIKLUND, J.M.; Idaho State University: INNERVATION OF THE LOWER JAW IN Xenopus laevis The purpose of this study is to examine the neurons that innervate the hypoglossal nerve in the lower jaw of the frog, Xenopus laevis. Previous studies have shown that the hypoglossal nerve innervates the tongue protractor and retractor muscles in frogs. However, […]

SCOBELL, S.K.*; KNAPP, R.; Univ. Oklahoma, Norman: Hormonal and morphological correlates of reproductive state in the sex-role reversed Gulf pipefish Little is known about the hormonal mediation of female competitive aggression (e.g., Staub and DeBeer 1997). One possibility is that similar hormones mediate aggressive behavior in females and males. Previous studies of male aggression have […]

HOLAK, J.L.; FISH, F.E.; NOWACEK, D.P.; NOWACEK, S.M.; West Chester Univ., PA; West Chester Univ., PA; Mote Marine Laboratory, Sarasota, FL; Mote Marine Laboratory, Sarasota, FL: High performance turning capabilities during foraging by bottlenose dolphins (Tursiops truncatus) Large predators should have difficulty catching small prey, because small animals demonstrate greater maneuverability and agility compared to […]

BAKER, D.W.*; WOOD, A.M.; KIEFFER, J.D.; University of New Brunswick, Saint John; University of New Brunswick, Saint John; University of New Brunswick, Saint John: Hematological Changes Associated with Forced Activity in Shortnose and Atlantic Sturgeon We conducted experiments to determine the physiological response to forced activity in shortnose and Atlantic sturgeons. We measured a variety […]