منابع مشابه
How Birds Combat Ectoparasites
Birds are plagued by an impressive diversity of ectoparasites, ranging from feather-feeding lice, to featherdegrading bacteria. Many of these ectoparasites have severe negative effects on host fitness. It is therefore not surprising that selection on birds has favored a variety of possible adaptations for dealing with ectoparasites. The functional significance of some of these defenses has been...
متن کاملEctoparasites from birds in Newfoundland.
During an ongoing survey of the ectoparasites of birds in Canada (Bourgeois and Threlfall, 1981, Proc. Entomol. Soc. Wash. 83: 799-800; Eveleigh and Threlfall, 1974a, Proc. Entomol. Soc. Wash. 76: 270-277; Eveleigh and Threlfall, 1974b, Acarologia 16: 621-635; Eveleigh and Threlfall, 1975, Can. J. Zool. 53: 82-86; Eveleigh and Threlfall, 1976, Can. J. Zool. 54: 1694-171 1; Fitzpatrick and Threl...
متن کاملInsect ectoparasites from wild passerine birds in the Czech Republic.
Wild passerine birds (Passeriformes) from northeastern part of the Czech Republic were examined for ectoparasites. Three species of louse-flies of the genus Ornithomya (Diptera: Hippoboscidae), two species of fleas of the genera Ceratophyllus and Dasypsyllus (Siphonaptera: Ceratophyllidae), and 15 species of chewing lice belonging to the genera Myrsidea, Menacanthus (Phthiraptera: Menoponidae),...
متن کاملHow "The Samaritans" Combat Suicide
A PERSON tempted to kill himself may need one, two or all three of the following kinds of help: medical treatment, non-medical counselling, non-professional befriending. In many cases, e.g. endogenous depression, the life cannot be saved without the first of these; yet the most important of these is the last. If two kinds of help are needed, befriending is one of them. If only one kind of help ...
متن کاملUnderstanding how birds navigate
Creatures as varied as salmon, honeybees, and migratory birds such as European robins have an intriguing ‘sixth’ sense that allows them to distinguish north from south.1–4 Yet despite decades of study, the physical basis of this magnetic sense remains elusive. Detailed understanding of magnetoreception in animals has tremendous applications. For example, it is well known that windmills construc...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Open Ornithology Journal
سال: 2010
ISSN: 1874-4532
DOI: 10.2174/1874453201003010041