The Ecology and Reproductive Biology of Paradella dianae (Crustacea Isopoda)

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 […]

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 […]

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 […]

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