منابع مشابه
Migrants in tropical bird communities: the balanced breeding limitation hypothesis
Explanations for the ecological integration of migratory and non-migratory (resident) insectivorous birds in the tropics have been complicated by the paradox that arthropod abundances are low when bird abundances reach their annual peak. The breeding currency hypothesis and the nest predation hypothesis both account for this paradox by postulating that residents are held below the non-breeding ...
متن کاملBeyond population regulation and limitation
The study of population dynamics addresses three questions that are not always separated in discussions with empirical data. Two questions address population regulation. What stabilises population density is the first question, and, in spite of much theory, little progress has been made in answering this question empirically. The assumption of an equilibrium density is impossible to test and di...
متن کاملThe association between mental health symptoms and mobility limitation among Russian, Somali and Kurdish migrants: a population based study
BACKGROUND Research has demonstrated a bidirectional relationship between physical function and depression, but studies on their association in migrant populations are scarce. We examined the association between mental health symptoms and mobility limitation in Russian, Somali and Kurdish migrants in Finland. METHODS We used data from the Finnish Migrant Health and Wellbeing Study (Maamu). Th...
متن کاملAsthma, airflow limitation and mortality risk in the general population.
Asthma and chronic obstructive pulmonary disease co-exist in a significant proportion of patients. Whether asthma increases mortality risk among subjects with airflow limitation remains controversial. We used data from 2121 adult participants in the population-based Tucson Epidemiological Study of Airway Obstructive Disease cohort. At enrolment (1972-1973), participants completed questionnaires...
متن کاملMate limitation in an estuarine population of copepods
We determined the probability of mating as a function of population density in the estuarine copepod Acartia hudsonica by combining experimental measurements with a simple model. Pairs of unmated copepods were confined in containers of various volumes to simulate variable population density, and experiments were run for 8, 16, and 24 h. Mating frequencies indicated that males search for females...
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ژورنال
عنوان ژورنال: Ibis
سال: 2004
ISSN: 0019-1019
DOI: 10.1111/j.1474-919x.2004.00293.x