Interannual Variation in Egg Neglect and Incubation Routine of Rhinoceros Auklets Cerorhinca Monocerata during the 1998-1999 El Niño / La Niña Events
نویسندگان
چکیده
Unlike terrestrial birds, many species of seabirds forage far from their breeding sites. Alternating nest attendance by the two parents allows for long distance foraging trips during lengthy incubation periods. Even so, limited food availability or poor weather can sometimes delay birds in their return to the nest. Thus, egg temperatures may drop to ambient levels for periods of a day or more (Wheelwright & Boersma 1979, Gaston & Powell 1989, Warham 1990), even in localities where the ambient summer temperature is as low as 0°C (Roberts 1940, Pefaur 1974).
منابع مشابه
Genetic structure of rhinoceros auklets, Cerorhinca monocerata, breeding in British Columbia, Alaska, and Japan
The rhinoceros auklet (Cerorhinca monocerata) breeds on islands in the North Pacific from California to Japan. Breeding colonies are not evenly distributed along the coastline nor are population numbers similar throughout the range with approximately 50 % of the birds breeding in British Columbia, Canada (Rodway 1991). Like other puffins (tribe Fraterculini), rhinoceros auklets lay a single-egg...
متن کاملCorticosterone levels in feathers and blood of rhinoceros auklets Cerorhinca monocerata are affected by variation in environmental conditions
from genetic homogeneity). CORT showed the same pattern of dichotomy; of particular note, but contrary to our a priori prediction, blood CORT levels were higher in auklets that bred on a colony in which early chlorophyll-a bloom in local waters suggested good feeding conditions, than in auklets that bred on a colony with later local chlorophylla bloom. Also contrary to prediction, feather CORT ...
متن کاملAre yolk androgens adjusted to environmental conditions? A test in two seabirds that lay single-egg clutches.
It is widely believed that female birds strategically allocate androgens to yolk in the manner that best equips offspring for feeding conditions during their development. Because most avian studies have focused on multi-egg clutch species, and interpreted results within the framework of sibling competition, we still know little about how yolk androgens might be allocated in direct response to e...
متن کاملApplicability of the doubly labelled water method to the rhinoceros auklet, Cerorhinca monocerata
The doubly labelled water (DLW) method is an isotope-based technique that is used to measure the metabolic rates of free-living animals. We validated the DLW method for measuring metabolic rates in five rhinoceros auklets (Cerorhinca monocerata) compared with simultaneous measurements using the respirometric method. We calculated the CO(2) production rate of four auklets (mean initial body mass...
متن کاملDo marine birds use environmental cues to optimize egg production? An experimental test based on relaying propensity
According to the environmental cues hypothesis, female birds use information available to them in the early-season environment to fine-tune egg production annually. However, support for the hypothesis derives largely from correlational studies. In each year from 2002 to 2006, which spanned a period of extreme variation in environmental conditions, we removed eggs from early-laying rhinoceros au...
متن کامل