منابع مشابه
Gavin Milroy
member of the Hunterian Society of Edinburgh. He started on his career as an assistant to a practitioner in London; and being desirous of visiting foreign parts, he next took employment in the Government mail-packet service, which gave him opportunities of going to the West Indies, and to the Mediterranean, where the odious usage of quarantine was then exercised to its fullest extent. He retain...
متن کاملThe American Midland Naturalist
—Ascertaining the functions bird song requires information about when and where a song or, for males with multisong repertoires, songs are used. Because the need for and type of communication with mates and conspecifics changes with breeding stage and social context, detailed observations may reveal differential use of song or of different song types. Our objective was to examine the use, and d...
متن کاملThe American Midland Naturalist
—Defining the trophic position of stream organisms is a first step in understanding the ecology of lotic systems. Whereas trophic positions of stream fishes have been traditionally assigned based on dietary analysis, stable isotope ratios may provide additional information on the validity of this approach and may be used to verify energy acquisition assumed from dietary studies. In this study, ...
متن کاملThe lonely eye.
A lthough the dinosaurs are gone, extant vertebrates provide clues to the development of photorecep-tion among the clades that probably preceded and then radiated into the dinosaurs. The ancient order Rhyncho-cephalia, which includes Sphenodon as its only family, with two surviving species, had its heyday between 200 million and 100 million years ago. While this order is reptilian, these creatu...
متن کاملThe American Midland Naturalist
—We sampled fishes and aquatic insects monthly ( Jun.–Sept. 2002) from intermittent tributaries of the Alum Fork of the Saline River (Arkansas, U.S.A.) to quantify the response of fish and aquatic insect assemblage properties to seasonal desiccation and habitat fragmentation. We collected a total of 4219 individuals, representing 18 species of fishes and 27 families of aquatic insects. Changes ...
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ژورنال
عنوان ژورنال: American Studies in Scandinavia
سال: 2007
ISSN: 0044-8060
DOI: 10.22439/asca.v39i2.4611