Hochberg, R.: Function and systematic distribution of helicoidal muscles in Gastrotricha Studies on the muscular system of gastrotrichs revealed the presence of muscles in a new orientation, that of left- and right-handed helices around the digestive tract. These helicoidal muscles are found on the pharynx and intestine of numerous species in both orders, Chaetonotida and […]

Hayes, K.H.*; Karl, S.A.: Evolution of the �Corona Complex� Within the Genus Melongena (Gastropoda:Melongenidae): Evidence From Internal Transcribed Spacers and Microsatellite Data Gastropods are an exceptionally speciose and diverse group of marine invertebrates, having undergone numerous adaptive radiations during their long evolutionary history. This diversity combined with their conspicuousness in the marine environment make them […]

BETTENCOURT, B.R.*; FEDER, M.E.: Concerted evolution and concerted degeneration at the hsp70 genes and pseudogenes of the Drosophila melanogaster species subgroup. To determine how the hsp70 genes (4-5 copies total, at two chromosomal loci) coevolved with the diversification of the D. melanogaster species subgroup, we sequenced multiple alleles of each gene in representative species. The […]

LYNOTT, Aaron J.; BANTA, Marilyn; HIGGINBOTHAM, Clay M.; BAKKEN, George S.: Thermoregulation in Swimming Mallard Ducklings Most duckling mortality occurs in the first week after hatching, and is often associated with chilling by cold, windy, wet weather, extended periods of swimming in cold water, or both. We measured the thermoregulatory ability of 3 to 5 […]

FRANK, C.L.*; HOOD, W.: The effects of alpha-linolenic acid on mammalian torpor patterns. Laboratory experiments have demonstrated that the torpor of ground squirrels ( Spermophilus lateralis ) is enhanced by a high linoleic acid diet. Linoleic acid is a polyunsaturated fatty acid (PUFA), and mammals cannot synthesize PUFAs. The diets of free-ranging ground squirrels contain […]

NESPOLO, RF; BACIGALUPE, LD; BOZINOVIC, F: On the heritability of body temperature in endotherms: a study in leaf eared mice Natural selection acts over additive genetic variation. Consequently, its measurement is a requisite for any statement about the evolutionary significance of a trait. The evolution of endothermy is a long-standing issue in which body temperature […]

MCLISTER, J.D.; SORENSEN-FORBY, J.S. ; DEARING, M.D.: Do woodrats use dietary toxins to reduce thermoregulatory costs? Several woodrat species feed more extensively on toxic plants during the winter, thus exposing themselves to high toxic stress when thermal stress is also high and when energy availability is low. Because studies show that non-lethal exposure to toxins […]

HAIM, A; SHANAS, U; SCANTLEBURY, M: COMPARATIVE PHYSIOLOGY OF SPINY MICE POPULATIONS – EFFECTS OF SLOPE FACING MICRO-HABITATS The common spiny mouse is widely distributed in rocky habitats of Israel from the desert to the Mediterranean ecosystem. A comparative study between mice from a desert population and a Mediterranean population revealed significant differences of thermo […]

PETERSON, C.C.*; LIGON, D.B.: Acute and acclimational effects of temperature on metabolic rates of hatchling slider turtles: embryonic metabolic compensation? Reptile embryos may blunt the acute physiological effects of incubation temperature through chronic acclimation (compensation) of anabolic and developmental processes, and an integrated consequence of such adjustments is temperature compensation of metabolic rates. We gauged […]

RAVOSA, M.J.; Northwestern U & Field Museum: Ontogeny and Phyletic Size Change in Extant and Extinct Malagasy Primates Recent Malagasy lemurs are notable for encompassing the range of body-size variation noted for all primates past and present – about 5 orders of magnitude. Benefiting from the close phylogenetic proximity of many larger-bodied subfossil taxa to […]