Our Winter Birds
نویسندگان
چکیده
منابع مشابه
Does organic farming benefit farmland birds in winter?
The generally higher biodiversity on organic farms may be influenced by management features such as no synthetic pesticide and fertilizer inputs and/or by differences in uncropped habitat at the site and landscape scale. We analysed bird and habitat data collected on 48 paired organic and conventional farms over two winters to determine the extent to which broad-scale habitat differences betwee...
متن کاملPoleward shifts in winter ranges of North American birds.
Climate change is thought to promote the poleward movement of geographic ranges; however, the spatial dynamics, mechanisms, and regional anthropogenic drivers associated with these trends have not been fully explored. We estimated changes in latitude of northern range boundaries, center of occurrence, and center of abundance for 254 species of winter avifauna in North America from 1975 to 2004....
متن کاملWinter feeding of birds increases productivity in the subsequent breeding season.
Supplementary food given to birds can have contemporary effects by reducing the risk of starvation, increasing survival and altering movements and reproductive performance. There is, however, a widely held perception that birds benefit from extra food over winter, but that it is better that they 'look after themselves' during breeding. Here we describe a landscape-scale experiment showing for t...
متن کاملPrecipitation and winter temperature predict long-term range-scale abundance changes in Western North American birds.
Predicting biodiversity responses to climate change remains a difficult challenge, especially in climatically complex regions where precipitation is a limiting factor. Though statistical climatic envelope models are frequently used to project future scenarios for species distributions under climate change, these models are rarely tested using empirical data. We used long-term data on bird distr...
متن کاملMarine Birds in the Marginal Ice Zone of the Barents Sea in Late Winter and Spring
We recorded the distribution and abundance of marine birds in the northern Barents Sea from 27 February to 8 March 1987 and from 20 to 31 May 1988. Birds were more abundant in waters associated with pack ice than in open water away from pack ice. Within the pack ice, thick-billed murres (Uria lomvia) were the most commonly encountered birds in both periods. Murre densities in the pack ice north...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1887
ISSN: 0036-8733
DOI: 10.1038/scientificamerican02261887-133a