OMANA, E.C.*; SHUSTER, S.M.: The Ecology and Reproductive Biology of Paradella dianae (Crustacea: Isopoda) Sphaeromatid isopods are distributed worldwide, primarily in shallow marine waters. Paradella dianae is a sexually dimorphic sphaeromatid isopod that inhabits many localities, including the northern Gulf of California. To examine the reproductive biology of this species, we made six collections of […]
year: 2002
The Distribution of the Mud Shrimp, Neotrypaea uncinata, on Horizontal, Vertical and Geographic Scales within Estero Morua, Sonora, Mexico
AGOSTA, A*; WILDEY, HC; VUTURO, SA; SHUSTER, SM: The Distribution of the Mud Shrimp, Neotrypaea uncinata, on Horizontal, Vertical and Geographic Scales within Estero Morua, Sonora, Mexico Mud shrimp (Decapoda: Thallassinidea) are among the most abundant infaunal animals inhabiting estuaries and mud flats in temperate and tropical waters. We examined the vertical and horizontal distributions […]
Sex change and cannibalism in Gulf of California populations of a commensal polychaete
VUTURO, S. A.*; SHUSTER, S. M.: Sex change and cannibalism in Gulf of California populations of a commensal polychaete Most polychaetes are known to be gonochoristic. Hermaphroditism appears to have arisen independently in several families. We have shown that, Ophiodromus pugettensis, a hesionid commensal of sea stars in California, is a simultaneous hermaphrodite with a […]
Male badge size and maternal yolk steroids in House Sparrows
POOPATANAPONG, AMY*; SCHWABL, HUBERT: Male badge size and maternal yolk steroids in House Sparrows. The good-genes hypothesis of female mate choice and sexual selection predicts that offspring fathered by preferred males will have increased fitness resulting from inherited superior male genes. However recent studies showed that females deposit more yolk androgen into their eggs when […]
The Effects of Exogenous Testosterone on Male Incubation in Blue-headed Vireos (Vireo solitarius)
VAN ROO, B.L.: The Effects of Exogenous Testosterone on Male Incubation in Blue-headed Vireos (Vireo solitarius) Natural variation in circulating testosterone (T) is thought to play a proximate role in inter- and intra-specific variation in paternal care in birds. In previous studies, experimental manipulation of T in males has reduced rates of feeding young in […]
Testosterone promotes paternal behaviour in a monogamous mammal via conversion to estrogen
TRAINOR, B. C.; MARLER, C. A.: Testosterone promotes paternal behaviour in a monogamous mammal via conversion to estrogen Typically thought of as a hormone that inhibits paternal behavior, recent correlational and hormone manipulation studies have found that testosterone (T) could actually promote paternal behaviors in mammals. Here we show that in the California mouse, Peromyscus […]
Reproductive suppression and reproductive competition in female common marmosets Effects of an unrelated male
SALTZMAN, W.; PICK, R.R.; SALPER, O.J.; LIEDL, K.J.; ABBOTT, D.H.: Reproductive suppression and reproductive competition in female common marmosets: Effects of an unrelated male Groups of cooperatively breeding common marmoset monkeys (Callithrix jacchus) often contain only a single dominant, breeding female; subordinate females typically undergo behavioral and physiological suppression of reproduction. However, recent findings indicate […]
Non random mating in big brown bats
SCHMAEMAN, C.N.*; MENDON�A, M.T.: Non random mating in big brown bats? Very little is known about the mating systems of temperate vespertilionid bats. Available data is usually anecdotal and only represents a snapshot of which males are successfully mating in the population. Furthermore, there has been no study monitoring male mating success over time. We […]
Effects of temperature on mating discrimination in male big brown bats
MENDON�A, , M.T.: Effects of temperature on mating discrimination in male big brown bats Previous experiments in our laboratory have explored the role of temperature in stimulating mating in male big brown bats. Changes in temperature have been found to modulate the frequency of mating behavior. Although males will continue to mate even when kept […]
Nitric oxide as a specificity determinant in the squid-Vibrio association
DAVIDSON, S.K.; KOROPATNICK, T.; KOSSMEHL, R.; MCFALL-NGAI, M.J.: Nitric oxide as a specificity determinant in the squid-Vibrio association During colonization of the Euprymna scolopes light organ, the symbiont Vibrio fischeri aggregates in mucus that is secreted by cells of a complex ciliated field on the surface of the nascent light organ. Once aggregated, the symbionts […]