Fish Ecology - download pdf or read online

By R. J. Wootton (auth.)

ISBN-10: 0751403067

ISBN-13: 9780751403060

ISBN-10: 940113832X

ISBN-13: 9789401138321

Fishes dwell in an international that's unusual to us. even if we may well make or perhaps extra complex short visits to this different international utilizing a snorkel, scuba diving apparatus, we will be able to by no means develop into part of it. but, an knowing of fish ecology calls for an information of the relationships among fishes and their surroundings. the aim of this ebook is to introduce the ecology of fishes by means of describing the inter-relationships among fishes and the aquatic habitats they occupy. The booklet may be learn in complementary methods. A sequential examining, bankruptcy by means of bankruptcy, covers the most issues of ecology, together with habitat use, species interactions, migration, feeding, inhabitants dynamics and copy in terms of the key habitats occupied by means of fishes. another examining selects a selected type of habitat, corresponding to rivers, and, by utilizing the index and skipping from bankruptcy to bankruptcy, builds up an image of the ecology of fishes dwelling in that habitat. The textual content is written for complex scholars. Its emphasis is on descriptive instead of quantitative ecology. it truly is assumed that the reader may be conversant in the fundamental biology of fishes, obtained from a textual content comparable to The Biology of Fishes (Bone and Marshall, 1982) additionally released within the Tertiary point Biology sequence. i need to thank Dr J. D. Fish and nameless reviewers who, inside a decent time-schedule, attempted to enhance the textual content. Any error and shortcomings are my contribution.

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Sample text

These rivers are discoloured by organic compounds produced during the decomposition of plant materials. 5. Yet such rivers can support a diverse fish fauna. Over 400 species have been collected from the Rio Negro and the full species count may approach 800. , 1988). At the other extreme are streams in deserts that break up into pools during dry periods. Evaporation then increases the salt content of the waters. The resulting high salinities exclude primary freshwater species that are unable to osmoregulate in such conditions.

Mesoxic species, including pike and perch, require a minimum of 5 mg 1 -1. 5 mg 1 - 1. 3 Salinity Most fishes spend all their lives in water that changes little in its salinity. However, some live in environments such as estuaries where salinity can change rapidly. Other species move, during migration, between waters that differ greatly in their salinity (chapter 4). g. g. g. trigger fish. 32 FISH ECOLOGY the changes in salinity. Occasionally, sudden changes in salinity may cause catastrophic mortalities as, for example, when the sea breaches a barrier and floods into a freshwater lagoon.

In Lake Magadi in East Africa, a cichlid, Oreochromis grahami, lives in water that reaches 39°C because of the presence of hot springs (Lowe-McConnell, 1987). Nevertheless, few species can tolerate such high temperatures. In deep tropical lakes, much of the deeper hypolimnion lacks any permanent fish fauna because of the lack of oxygen. A few deep-water species may make excursions into these anoxic waters to feed before returning to oxygenated waters. 44 FISH ECOLOGY In lakes at higher latitudes, oxygen can become a limiting factor in two situations.

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Fish Ecology by R. J. Wootton (auth.)

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