نتایج جستجو برای: New wintering population
تعداد نتایج: 2458768 فیلتر نتایج به سال:
New wintering populations of Whooper Swan have been recently reported from west Asia, a lack of information about the population and its origin. The understanding the genetic structure and connectivity are crucial for determining strategies of management for its conservation programs. The samples were collected from two populations in northern Iran, Finland, Sweden, and Iceland, where with larg...
The Purple Sandpiper (Calidris maritima) is a medium-sized shorebird that breeds in the Arctic and winters along northern Atlantic coastlines. Migration routes and affiliations between breeding grounds and wintering grounds are incompletely understood. Some populations appear to be declining, and future management policies for this species will benefit from understanding their migration pattern...
The Beringia region of the Arctic contains 2 colonies of lesser snow geese (Chen caerulescens caerulescens) breeding on Wrangel Island, Russia, and Banks Island, Canada, and wintering in North America. The Wrangel Island population is composed of 2 subpopulations from a sympatric breeding colony but separate wintering areas, whereas the Banks Island population shares a sympatric wintering area ...
Many of the ideas and controversies regarding the origin, evolution, and significance of avian migration derive from investigations of Old World migrants wintering in the European subtropics and central African Tropics. One of the critically important studies in the development of these ideas was the work by Morel & Bourlière (1962) on migratory bird ecology in Senegal, from which they conclude...
Whooper swans have two old and new populations, the new population has reported since 2007. The current study aimed to investigate the genetic structure of this species and compare their gene pool, especially the new population. For this purpose, 110 samples from Iran and four European countries were analyzed, using six microsatelite loci. In addition to the samples of the emerging population i...
Identifying post-breeding migration and wintering distributions of migratory birds is important for understanding factors that may drive population dynamics. Red-throated Loons (Gavia stellata) are widely distributed across Alaska and currently have varying population trends, including some populations with recent periods of decline. To investigate population differentiation and the location of...
armenian gull larus armenicus formerly listed as a subspecies for herring gull larus argentatus and further introduced as a full species in 1980. this species mostly found in caucasus and middle east regions. thair breeding areas are in georgia, armenia, turkey and iran. meyghan wetland is an important wintering area for a number of migratory species especially for common crane grus grus, furth...
Since 1899 ringing (or banding) remained the most important source of information about migration routes, stopover sites and wintering grounds for birds that are too small to carry satellite-based tracking systems. Despite the large quantity of migrating birds ringed in their breeding areas in Europe, the number of ring recoveries from sub-Saharan Africa is very low and therefore the whereabout...
While wild goose populations wintering in North America and Europe are mostly flourishing by exploiting farmland, those in China (which seem confined to natural wetlands) are generally declining. Telemetry devices were attached to 67 wintering wild geese of five different species at three important wetlands in the Yangtze River Floodplain (YRF), China to determine habitat use. 50 individuals of...
France is traditionally a staging area for Greylag Geese Anser anser migrating from northwest Europe to wintering sites in Spain, though increasing numbers have wintered in France over the last three decades. This paper considers sightings within France of neck-banded individuals marked elsewhere in Europe since the 1980s, to determine the origin of Greylag Geese staging and now wintering in th...
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