COOPER, S.J.*; SAME, D.R.: Ventilatory Accomodation Under Cold Stress in Seasonally Acclimatized Black-capped Chickadees Black-capped chickadees undergo seasonal acclimatization that is characterized by an increase in both basal and summit metabolism in winter birds compared to summer birds. Little is known about how the avian ventilatory system accommodates the large changes in rates of oxgyen […]

HOAGLAND, T.M.*; ROESER, M.; OLSON, K.R.: Venous Function in Trout The venous system is an important effector of cardiovascular homeostasis in mammals, whereas this vasculature’s function in fish, remains nebulous. Fish live in a gravity-free environment and their veins appear poorly endowed with smooth muscle, therefore it has been suggested that fish veins serve primarily […]

Thurman, C.L.* : Variance in Osmoregulation among Sympatric Fiddler Crabs, genus Uca, from Texas Osmoregulatory capabilties were measured in five species of fiddler crabs from eight coastal locations in Texas. Specimens were placed in finger bowls containing 50 mls of water ranging in osmolarity from 50 to 3450 mOsm (2 to 110 ppt). Survivorship was […]

DAVIS, E.C.: Thermal stresses in the intertidal on acorn barnacles (Balanus glandula and Semibalanus cariosus) Intertidal organisms live in an environment that has large thermal changes through the course of the tidal cycle. Acorn barnacles are found both on exposed rocks and in tidepools in the rocky intertidal. The thermal factors affecting Balanus glandula and […]

HANCOCK, T.V.*; GLEESON, T. T.: The tradeoff between endurance and metabolic costs using intermittent locomotion in the desert iguana (Dipsosaurus dorsalis). The elevated O2 consumption (VO2) observed during recovery from activity incurs additional metabolic costs to the animal beyond that seen during activity. These costs are also realized during intermittent activity, alternating exercise and rest, […]

REED, W.L.*: The plateau phase in egg metabolic rates: evidence for oxygen limitation. In bird eggs, rates of gas exchange across the shell are limited by diffusion and, thus, a function of the physical properties of the shell and the surrounding environment (i.e. conductance, surface area:volume ratio). As metabolic rates increase over the incubation period […]

Guadagnoli, J.A.*; Reiber, C.L.: The ontogeny of pericardial organs in the crayfish Procambarus clarkii Adult crayfish pericardial organs, as in lobsters are described as emerging from the thoracic nerves and running toward the dorsal surface of the heart, becoming fine fibers that eventually take on a beaded form. Trunks emerge between the epimeral plate and […]

FOURNIER, F.*; KARASOV, W.H.; MEYER, M.W.: The effect of feather development on the pharmacokinetics and oral bioavailability of methylmercury in common loon chicks Mercury is known to preferentially bind to structures containing sulfhydryl groups (e.g. keratin in growing feathers), and the latter affinity may influence the accumulation and excretion of ingested mercury in growing birds. […]

BAIER, D.B.*; GATESY, S.: The Role Of Avian Slow-Twitch Fibers in Turkey Tail Display EMGs from the tail muscles of male turkeys (Meleagris gallopavo) vary in amplitude between flight and display. In flight, caudal tail muscles yield high amplitude EMGs typical of twitch fibers. In display, male turkeys fan, raise, and turn their tails with […]

Chapman, L.: The Respiratory Ecology of Benthic Macroinvertebrates in a Swamp-River System in East Africa Hypoxia (oxygen scarcity) is widespread in tropical freshwater systems, particularly in dense swamps, and may be an important factor structuring benthic macro-invertebrate communities. Benthic macro-invertebrates show a broad diversity of respiratory modes ranging from atmospheric breathers to tracheal gills. These […]