نتایج جستجو برای: great cormorant
تعداد نتایج: 225334 فیلتر نتایج به سال:
--Nasal glands in Pelecaniformes are situated within the orbit in closely fitting depressions. Generally, the depressions are bilobed and small, but in Phalacrocoracidae they are more diverse in shape and size. Cormorants (Phalacrocoracinae) have small depressions typical of the order; shags (Leucocarboninae) have large, single-lobed depressions that extend almost the entire length of the front...
Changes in the size and proportion of limbs and other structures have played a key role in the adaptive evolution of species. However, despite the ubiquity of these modifications, we have a very limited idea of how these changes occur on the genetic and molecular levels. To fill this gap, we studied a recent and extreme case of wing and pectoral skeleton size reduction leading to flightlessness...
We studied the effects of low-frequency climate change on the reproductive performance of 11 species of marine bird in the southern California Current system, 1969–1997. Reproductive performance of Brown Pelican (Pelecanus occidentalis) and Double-crested Cormorant (Phalacrocrax auritus) in southern California demonstrated an increase in the 1970s and early 1980s, attributable to recovery from ...
background: present study was carried out in north of iran to investigate the concentration of mercury (hg) as one of the most toxic metals in tissues of two species of birds. methods: in this study, 15 birds from coot (fulica atra) and 18 birds from cormorant (phalacrocorax carbo) were hunted in anzali and gomishan wetlands. data-analyses carried out using spss software version 17 licenced by ...
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