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Annelida-13:Euhirudinea and acanthobdellidae

Davies, Ronald W. ; Govedich, Fredric R.

Ecology and Classification of North American Freshwater Invertebrates, Chapter 13, pp.465-504

ISBN: 978-0-12-690647-9 ; DOI: 10.1016/B978-012690647-9/50014-4

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  • Nhan đề:
    Annelida-13:Euhirudinea and acanthobdellidae
  • Tác giả: Davies, Ronald W. ; Govedich, Fredric R.
  • Là 1 phần của: Ecology and Classification of North American Freshwater Invertebrates, Chapter 13, pp.465-504
  • Mô tả: Leeches form an important component of the benthos of most lakes and ponds, and some species commonly occur in the quieter flowing sections of streams and rivers. There are 73 species presently recorded from North America, of which the majority is predators feeding on chironomids, oligochaetes, amphipods, and molluscs. The young of several species feed on zooplankton. Other species of leeches are temporary sanguivorous (blood feeding) ectoparasites of fish, turtles, amphibians, crocodilians, water birds, or occasionally humans. The majority of predaceous leeches have an annual or biannual life cycle, breeding once and then dying (semelparity). However, at least two species are shown to be genetically capable of breeding several times (iteroparity) although exhibiting phenotypic semelparity in the field. The majority of sanguivorous leeches are iteroparous, showing saltatory growth after the three or more blood meals required to reach mature size. Because of the diversity of physico-chemical conditions encountered in different aquatic ecosystems and temporally within a single habitat, leeches show considerable physiological plasticity. They are able to live in waters with very low salt concentrations as well as waters with salinities that exceed the salinity of seawater. Similarly, some species are capable of surviving in the absence of oxygen (anoxia) for more than 60 days and in the presence of supersaturated water (hyperoxia) for shorter periods. This chapter covers a detailed account on the morphology, physiology and habitat of Annelids.
  • Nơi xuất bản: Elsevier Inc.
  • Năm xuất bản: 2001
  • Ngôn ngữ: English;German;Italian;French;Russian
  • Số nhận dạng: ISBN: 978-0-12-690647-9 ; DOI: 10.1016/B978-012690647-9/50014-4

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