SCHANK, Jeffrey: Is Pseudoreplication a Pseudoproblem? In 1984, Stuart Hurlbert introduced the problem of pseudoreplication as serious and ubiquitous problem in ecological research design. Since then, the view that pseudoreplication is a serious research problem has spread to other fields including animal behavior. Pseudoreplication is best characterized as having two main concerns. First, the relationship […]

ROGOWITZ, G. L.: Influences of age and reproductive status on locomotor performance of mice. I tested whether the locomotor performance and aerobic capacity of the white-footed mouse (Peromyscus leucopus) change with age during postnatal development or with reproductive status (pregnancy and lactation). Either could have ecological or evolutionary consequences because locomotor performance can affect predation […]

JOHNSEN, S: Hidden in plain sight: cryptic and conspicuous coloration in the pelagic environment Despite the importance of cryptic and conspicuous coloration in pelagic ecosystems, few researchers have investigated the optimal reflectance spectra for either trait. In this study, the underwater radiance distribution in tropical oceanic water was modeled using measured inherent optical properties and […]

FINGERUT, J.T.; ZIMMER, C.A.; ZIMMER, R.K.: From host to host: interaction of behavior and the environment during parasite transmission Parasites that transmit infection between hosts through free-swimming larval stages must interact both with the host’s internal environment and external habitat. The trematode Himasthla rhigedana moves from its 1st to 2nd intermediary hosts as a free-swimming […]

SPERRY, T.S.*; WINGFIELD, J.C.: Effects Of The Antiandrogen Flutamide Upon Territorial Aggression In Male Free-Living Song Sparrows Male song sparrows, Melospiza melodia morphna, display territorial aggression in both breeding and nonbreeding seasons. Previous studies have demonstrated that estrogen plays a critical role in maintaining aggressive behavior in song sparrows. However, the role of androgens, acting […]

OWEN-ASHLEY, N.T.*; BUTLER, L.K.; ROHWER, S.; WINGFIELD, J.C.: The Role of Testosterone in a Moving Avian Hybrid Zone Three narrow hybrid zones exist between hermit (Dendroica occidentalis) and Townsend’s (D. townsendi) warblers in Oregon and Washington. Asymmetries in character transition curves suggest that these zones are moving, with Townsend�s warblers replacing hermit warblers. Previous work […]

PLACE, N.J.; DREA, C.M.; HOLEKAMP, K.E.; WELDELE, M.L.; COSCIA, E.M.; GLICKMAN, S.E.: Sex differences and effects of prenatal anti-androgens on LH secretion in spotted hyenas Sex differences in the secretion of luteinizing hormone (LH) have been attributed to the hormonal milieu to which mammals are exposed during gestation. Additionally, prenatal treatment with androgens can alter […]

LYNN, S.E*; WINGFIELD, J.C.: Sensitivity to supplementary testosterone during the parental phase in a high arctic breeding passerine In avian species that show paternal care, males� testosterone (T) levels peak early in the breeding season, and then decline through the parental phase. This may be related to a trade-off between T and paternal care: T […]

PERFITO, N; TRAMONTIN, A.D.; MEDDLE, S.L.; WINGFIELD, J.C.: Environmental and endocrine regulation of reproduction in song sparrows along an altitudinal gradient. While the direct effects of daylength on seasonal reproduction are well understood, less is known about how supplementary cues (e.g. temperature, rainfall) influence this process. We compared seasonal gonadal growth among non-migratory populations of […]

ELF, P.K.*; LANG, J.W.; FIVIZZANI, A.J.: Dynamics of Exogenous 3H Estradiol Uptake in Turtle Eggs During Development. Sex steroids in the egg yolks of reptiles with TSD (temperature-dependent sex determination) likely affect sex determination and differentiation in some lizards, turtles and crocodilians. In order to determine yolk estradiol (E) dynamics during embryonic development, 3H-estradiol (3H-E) […]