Sea buckthorn berries Hippophae rhamnoides L. predict size and composition of a great tit population Parus major L

Autor:	Richard Ubels, Ido Pen, Rienk W. Fokkema, Joost M. Tinbergen
Přispěvatelé:	Both group, Pen group, Conservation Ecology Group
Jazyk:	angličtina
Rok vydání:	2019
Předmět:	0106 biological sciences Population Zoology Berry 01 natural sciences Population density 010605 ornithology beech crop FOOD DEPENDENCE winter food Seasonal breeder sex education population density Ecology Evolution Behavior and Systematics Parus education.field_of_study WEATHER biology Population size Cyanistes CONSUMPTION FLUCTUATIONS biology.organism_classification CLIMATE DENSITY SURVIVAL WINTER Animal Science and Zoology apparent survival TOP-DOWN Sex ratio population control
Zdroj:	Journal of Avian Biology, 50(8):02037. Wiley
ISSN:	0908-8857
DOI:	10.1111/jav.02037
Popis:	In seasonal environments variation in food abundance in the non-breeding season is thought to affect songbird population dynamics. In a unique tit-sea buckthorn berry system we can estimate the berry abundance and both the tit consumption and population dynamics. Six hundred nest boxes were available to great and blue tits Cyanistes caeruleus for breeding in spring and roosting in winter. We followed the dynamics including the recapture histories of individually marked great tits from 2008 to 2014. In each year we estimated 1) the winter sea buckthorn berry availability, 2) an index of berry consumption in December based on the colour of the faeces of roosting birds, 3) the number of breeding great and blue tits, 4) both recapture probability and the return rate of the great tits and 5) immigration rates. December berry abundance positively predicted the number of breeding pairs of both species in the subsequent season and great tit return rates in the second half of the winter. There was support for a sex specific berry effect on the adult return rate in the great tit: female return rate was associated less strongly to berry abundance than male return rate. This skewed the sex ratio of the local breeders in the following breeding season. Intriguingly, annual berry consumption in December was not related to berry abundance, and individuals consuming more berries tended to have slightly lower return rates. Reproductive rate was not related to berry abundance. There was hardly support for a relation between immigration rates of first year breeders and berry abundance. Taken together these results imply that berry stock not only affected population size but also the population composition through sex specific exchange with the surroundings. Since population density covaried with berry abundance, density dependent effects provide an alternative explanation for the patterns observed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e8eab539181cea6cfe5cc80ccb5795f2 https://doi.org/10.1111/jav.02037 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
Nepřihlášeným uživatelům se plný text nezobrazuje	K zobrazení výsledku je třeba se přihlásit.