Why be amphidromous: expatrial dispersal and the place of source and sink population dynamics?

Why be amphidromous: expatrial dispersal and the place of source and sink population dynamics? Amphidromous fishes are found predominantly on the tropical and subtropical islands of the globe and there are few amphidromous species on continents. I suggest that this idiosyncratic distribution relates in part to problems in self-recruitment on islands that are often young or volcanic, and which may have streams with ephemeral flows across relatively short times scales. Amphidromy provides the ability to invade new habitats as these become available either on newly emergent (often volcanic) islands, or following perturbation after stream dewatering or the impacts of volcanism on older islands as a consequence of expatrial dispersal. Source/sink population dynamics may also be involved with islands ‘downstream’ in oceanic current systems behaving as sinks, with little or no self-recruitment. Streams in steep topography seem to be favoured by amphidromous species, perhaps because they provide more rapid transport to sea of the tiny, newly hatched larvae. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Reviews in Fish Biology and Fisheries Springer Journals

Why be amphidromous: expatrial dispersal and the place of source and sink population dynamics?

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Publisher
Springer Netherlands
Copyright
Copyright © 2009 by Springer Science+Business Media B.V.
Subject
Life Sciences; Zoology ; Freshwater & Marine Ecology
ISSN
0960-3166
eISSN
1573-5184
D.O.I.
10.1007/s11160-009-9125-2
Publisher site
See Article on Publisher Site

Abstract

Amphidromous fishes are found predominantly on the tropical and subtropical islands of the globe and there are few amphidromous species on continents. I suggest that this idiosyncratic distribution relates in part to problems in self-recruitment on islands that are often young or volcanic, and which may have streams with ephemeral flows across relatively short times scales. Amphidromy provides the ability to invade new habitats as these become available either on newly emergent (often volcanic) islands, or following perturbation after stream dewatering or the impacts of volcanism on older islands as a consequence of expatrial dispersal. Source/sink population dynamics may also be involved with islands ‘downstream’ in oceanic current systems behaving as sinks, with little or no self-recruitment. Streams in steep topography seem to be favoured by amphidromous species, perhaps because they provide more rapid transport to sea of the tiny, newly hatched larvae.

Journal

Reviews in Fish Biology and FisheriesSpringer Journals

Published: Jun 30, 2009

References

  • Distribution of two sympatric amphidromous, grazing fish, Plecoglossus altivelis Temminck and Schlegel and Sicyopterus japonicus (Tanaka) along the course of a temperate river
    Abe, S; Yodo, T; Matsubara, N; Iguchi, K
  • Ecological consequences of hydropower development in Central America: impacts of small dams and water diversions on Neotropical stream assemblages
    Anderson, EP; Freeman, MC; Pringle, CM

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