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Full-Text Articles in Life Sciences
Total Body Water And Body Composition In Phalaropes And Other Birds, Hugh I. Ellis, Joseph R. Jehl Jr
Total Body Water And Body Composition In Phalaropes And Other Birds, Hugh I. Ellis, Joseph R. Jehl Jr
Biology: Faculty Scholarship
Contrary to some reviews, total body water (TBW) may fall below the expected value of about 65% in birds if measured as a percentage of total body mass. However, water constitutes a relatively stable proportion (659%-70%) of body composition when measured as a percentage of lean body mass (LBM). We demonstrate this by using data from two migratory phalaropes (Phalaropus tricolor and Phalaropus lobatus), which exhibit inverse relationships between TBW and body mass and between TBW and fat content. As the phalaropes fatten before migration, lipids increase but not at the expense of water, which also increases with gains in …
Breeding Biology Of The Black Storm-Petrel At Islas Los Coronados, Baja California, Mexico, William T. Everett
Breeding Biology Of The Black Storm-Petrel At Islas Los Coronados, Baja California, Mexico, William T. Everett
Theses
Twenty-nine visits to Middle Rock, Islas Los Coranados, were made between March 1989 and September 1990, including 10 overnight visits. Breeding phenology was studied, including timing of colony attendance by adult birds, timing of egg laying, hatching, and fledging. Over 200 birds were banded to determine nest site tenacity and pair bond retention. Details were recorded on nest site selection, interspecific competition, breeding success, chick growth and plumage development, adult morphometrics, molt, food items, vocalizations, and ectoparasites.