Colony Development and Density-Dependent Processes in Breeding Grey Herons
نویسندگان
چکیده
منابع مشابه
Breeding success of a colony of Boat-billed Herons Cochlearius cochlearius (Ciconiiformes: Ardeidae) in pasturelands of Costa Rica.
The breeding success of a double-brooding colony of Boat-billed Herons Cochlearius cochlearius was studied in pasturelands of Costa Rica. Mean clutch size in the first clutches (2.9 eggs/nest) was higher than in second and repeat clutches (2.3 eggs/nest). Breeding success was similar in the first attempt and second attempts (20.7% and 21.7%, respectively). In both attempts earlier nests enjoyed...
متن کاملBehavioral signature of intraspecific competition and density dependence in colony-breeding marine predators
In populations of colony-breeding marine animals, foraging around colonies can lead to intraspecific competition. This competition affects individual foraging behavior and can cause density-dependent population growth. Where behavioral data are available, it may be possible to infer the mechanism of intraspecific competition. If these mechanics are understood, they can be used to predict the po...
متن کاملBinomial Autoregressive Processes with Density Dependent Thinning
We present an elaboration of the usual binomial AR(1) process on {0, 1, . . . , N} that allows the thinning probabilities to depend on the current state n only through the “density” n/N , a natural assumption in many real contexts. We derive some basic properties of the model and explore approaches to parameter estimation. Some special cases are considered that allow for overand underdispersion...
متن کاملBreeding Biology of a Grey Eagle-buzzard Population in Patagonia
-we studied the breeding performance of a Grey Eagle-Buzzard (Geranoaetus melanoleucus) population in a region of northern Argentinian Patagonia where two different habitats occur; the mountains near the Andean cordillera and the plains where shrub-steppes predominate. Mean eagle density was 1 pair/l9 km2 (N = 44), with higher densities occuring in the plains (1 pair03.2 km2, N = 17) than in th...
متن کاملLongitudinal Development of Hormone Levels and Grey Matter Density in 9 and 12-Year-Old Twins
Puberty is characterized by major changes in hormone levels and structural changes in the brain. To what extent these changes are associated and to what extent genes or environmental influences drive such an association is not clear. We acquired circulating levels of luteinizing hormone, follicle stimulating hormone (FSH), estradiol and testosterone and magnetic resonance images of the brain fr...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Zoology
سال: 2013
ISSN: 1687-8477,1687-8485
DOI: 10.1155/2013/404065