MARTINEZ.G.M: Muscle Development in the Long-finned Squid using Phalloidin Staining Methods. Whole mounts and serial sections of embryonic and paralarval Loligo peali squids were prepared and stained with phalloidin�rhodamine flourescent stain which binds to F-actin filaments. Staining revealed a network of actin filaments at different densities at different stages. Muscles of the mantle, arms, tentacles […]

Heyland, A.*; Hodin, J.: Endogenous Thyroxine production in Sand Dollar larvae and its implication for the evolutionary loss of larval feeding Studies on thyroid hormone [T3 and thyroxine (T4)] effects on metamorphosis in amphibians have begun to elucidate how changes in thyroid hormone production and cellular responses underlie alterations in life history patterns. Recently, work […]

MASLAKOVA, S. A. ; NORENBURG, J. L. : Trochophore larva is plesiomorphic for nemerteans: evidence for prototroch in a basal nemertean Carinoma tremaphoros (Phylum Nemertea, Palaeonemertea). Nemertean worms are spiralians displaying a variety of developmental modes, from encapsulated direct to indirect planktotrophic development with radical metamorphosis. The pilidium, a specialized planktotrophic larva, characterizes the order […]

DAVIDOWITZ, G*; NIJHOUT, H.F.; D’AMICO, L.J.: How is an insect the size that it is? How do physiological mechanisms change to produce genetic, environmental, and plasticity effects on body size? Body size is one of the more important life history characters of many organisms; it is also well established that it is plastic. However, little […]

HALANYCH, Kenneth M: Evolution and habitat preference in Siboglinids (formerly Pogonophora) Siboglinids, previously referred to as pogonophorans, are marine protostome worms which lack a functional gut and harbor endosymbiotic bacteria. Of the two major recognized clades, frenulates and vestimentiferans, the evolutionary history of the vestimentiferans is one of the best studied for any annelid. Recent […]

SWANSON, C.A.: Consequences of communal egg-laying in the apple murex snail, Phyllonotus pomum Communal egg-laying, the sharing of hard substrates by conspecifics for depositing clutches of egg capsules, is common among gastropod molluscs. The apple murex snail, Phyllonotus pomum, lays globular communal egg masses composed of clutches simultaneously deposited by 2-52 females. As mass volume […]

COLLIN, R.: Biogeographic Patterns in Mode of Development in Marine Invertebrates Latitudinal patterns in mode of development of molluscs in the North Eastern Atlantic were first demonstrated by Thorson in 1946. He demonstrated that planktotrophic development is more common at low latitudes than at higher latitudes. Since then, it has often been assumed that this […]

O’BRIEN, DM; FOGEL, ML; BOGGS, CL: Amino acid metabolism in adult Lepidoptera: from biochemistry to life history evolution. Adequate nutrition is critical to reproduction in animals. In many species, proteins are the nutrient in lowest supply and highest demand. This is particularly true in nectar feeding insects; e.g. Lepidoptera, in which protein provisioning takes place […]

WATKINS, T.B.*; MCPEEK, M.A.; Macalester College, St. Paul, MN; Dartmouth College, Hanover, NH: Quantitative Genetics and the Foraging/Predation Risk Trade-Off in Green Frog Tadpoles Evolutionary genetic studies often examine traits that are ecologically important in that they are subject to selection in the wild. But when those traits are also responsible for shaping the distribution […]

SCHRADER, Matthew S; Florida State University, Tallahassee: Parental Effort and Parasite Resistance in the Red-bellied Woodpecker Traditionally, food limitation and nest predation were thought to be the major ecological forces shaping avian life histories. However, several recent studies have demonstrated a trade-off between reproductive effort and parasite resistance. These studies have led ecologists to reconsider […]