1 Wildlife Biologist, Institute of Arctic Biology, University of Alaska, Fairbanks, AK 99705 2 Wildlife Biologist, U.S. Fish and Wildlife Service, U.S. Department of Interior, 2800 Cottage Way, Room E1803, Sacramento, CA 95825 Abstract: Evidence of breeding and natal dispersal in alcids is typically provided by the resightings of banded birds, the establishment of new colonies, and/or evidence ...

—We provide substantial new information on the breeding biology of the Rusty-breasted Antpitta (Grallaricula ferrugineipectus ferrugineipectus) from 40 nests during four consecutive breeding seasons at Yacambú National Park in Venezuela. Vocalizations are quite variable in G. ferrugineipectus. Nesting activity peaked in April when laying began for half of all nests monitored. The date of nest i...

Abstract Experimental studies have shown that individual wildfowl can shorten or skip moulting if the time between breeding and wintering is short; however, in wild birds are scarce. We tracked nine Common Shelducks Tadorna tadorna during seasons determined flightless based on typical movement patterns. found different patterns for two late-breeding females, suggesting they skipped shortened mo...

Typhlonectes compressicauda is an aquatic gymnophionan amphibian living in South America. Its breeding cycle is linked to seasons, characterized by a regular alternation of rainy and dry seasons. During a complex biennial cycle, the female genital tract undergoes a series of alternations of increasing and decreasing, governed by equilibrium of proliferation and apoptotic phenomena. Immunohistoc...

Hon-Tsen Yu and Yao-Sung Lin (1999) Age, reproduction, and demography of the spiny rat (Muridae: Niviventer coxingi) in subtropical central Taiwan. Zoological Studies 38(2): 153-163. Annual reproductive cycles and demographic changes in a wild population of the spiny rat (Niviventer coxingi) in central Taiwan were studied. Reproductive status of the rat was investigated by autopsy and histologi...

The Concorde produces audible sonic booms as it passes 15 km north of Sable Island, Nova Scotia, where gray and harbor seals occur year round. The purpose of this research was to assess how sonic booms affect these seals. The intensity of the booms was measured and three types of data (beach counts, frequency of behavior, and heart rate) were collected before and after booms during the breeding...

Estradiol (E2) is important in activation of male reproductive behaviors, and masculinizes morphology of associated brain regions in a number of mammalian and avian species. In contrast, it is testosterone, rather than its metabolites, that is the most potent activator of male sexual behavior in green anole lizards. As in other vertebrate groups, however, E2 is critical for receptivity in femal...

Most species of marine turtle breed every loggerhead turtles. The median interval between nesting seasons for green turtles was 3 years, and for loggerhead two or more years and it is the norm for females to lay more than one clutch of eggs within a nesting season. turtles it was 2 years. Utilizing these parameters and available data from other beaches that are monitored Knowing the interval be...