Buchanan, J. S.*; Cranford, J. A.: Changes in energy utilization, food processing, and gastrointestinal morphology of voles under differing environmental conditions Meadow voles (Microtus pennsylvanicus) are small herbivores that are active year-round, yet have no capacity for torpor. Their food supply, though abundant, may be of low quality when plants undergo winter senescence. Therefore, they […]

WOODS, HA*; HOBBIE, SE; MAKINO, W; COTNER, J; HARRISON, JF; ELSER, JJ: Temperature shifts cause systematic changes in biochemical composition of poikilothermic organisms We surveyed the literature to explore the extent to which acclimation temperature influences the nitrogen (N) and phosphorus (P) and of N-rich (protein) and P-rich (RNA) biochemicals in poikilothermic organisms, including bacteria, […]

MCMILLAN, D.M.; TROLL, J.V.; RANK, N.E.; DAHLHOFF, E.P.: Survival, growth and effects of environmental stress in larvae of the Sierra willow beetle Chrysomela aeneicollis The Sierra willow beetle Chrysomela aeneicollis lives in heterogeneous thermal habitats in the Eastern Sierra Nevada. Habitat temperature appears to be a critical factor affecting beetle physiology and genetic variation among […]

RANK, N.E.; DAHLHOFF, E.P.: PGI genotype affects heat shock protein expression and freeze tolerance in the leaf beetle Chrysomela aeneicollis Natural selection may act on enzyme loci through genotypic differences in physiological performance at different temperatures. Allele frequency variation at the phosphoglucose isomerase (PGI) locus in the montane leaf beetle Chrysomela aeneicollis and biochemical differences […]

WILLIAMS, T.D.: Is the egg size-clutch size trade-off based on a resource allocation decision? Life-history trade-offs have proved difficult to demonstrate using phenotypic correlations and there is still surprisingly little empirical evidence for such trade-offs especially at the intraspecific level. In contrast, experimental (hormonal) manipulation of phenotypic traits has provided support for the existence of […]

NEARGARDER, G.G.; DAHLHOFF, E.P.; RANK, N.E.: Effect of PGI genotype and temperature exposure on thermal tolerance of the willow leaf beetle Chrysomela aeneicollis Natural selection may act on loci coding for polymorphic metabolic enzymes when genotypes differ in tolerance to temperature extremes. Allele frequency variation at the glycolytic enzyme locus phosphoglucose isomerase (PGI) relates to […]

RAMOS, MM; IRSCHICK, D; CHRISTENSON, T; Tulane University, New Orleans,LA; Tulane University, New Orleans,LA; Tulane University, New Orleans,LA: The paradox of palp removal in the spider Tidarren sysiphoides: a performance advantadge? Autotomy, the casting off of a body part, has evolved independently in several groups of organisms, and is thought to increase the short-term fitness […]

BOTZ, J.T.*; LOUDON, C.; BARGER, J.B.; OLAFSEN, J.S.; STEEPLES, D.W.; University of Kansas; University of Kansas; University of Kansas; University of Kansas; University of Kansas: Slipping on sandy slopes–physical determinants of antlion pit function The difficulty that insects have walking on inclined sand is used to advantage by antlions, which construct pits in sand for […]

SPAIN, Diara D. *; KIER, W.M.; UNC Chapel Hill; UNC Chapel Hill: Peristaltic Locomotion in Holothuroids (Echinodermata) Although many vermiform soft-bodied invertebrates use a form of peristaltic locomotion, this mode of locomotion has not been widely studied. In particular, the kinematics of different forms of peristaltic locomotion have received little attention previously. Time-lapse videorecording was […]

NICKEL, M.*; VITELLO, M.; BR�MMER, F.; Biological Institute of University Stuttgart, Germany: Dynamics of cellular movements in the locomotion of the sponge Tethya wilhelma The globular sponge Tethya wilhelma SAR�, SAR�, NICKEL & BR�MMER 2001 (Porifera, Demospongiae, Hadromerida, � 5-30 mm) is capable of locomotion. Many sponges display very slow body dislocation, but several small […]