Assemblages
An
assemblage consists of the various species populations of a larger taxon in a
defined area. Assemblage structure refers mainly to the number of
individuals, species, and families, and the predator–prey interactions and
other trophic relationships between fishes (e.g., Matthews 1998). Ecological
interactions thus occur within a fish assemblage, within a
spiderassemblage, etc. Focusing
on assemblages is admittedly myopic, since fishes interact with invertebrate
prey and parasites, with plants as food and shelter, with reptiles, birds, and
mammals as predators, etc. However, fish–fish interactions are particularly
obvious, it is often logistically difficult to deal with all components of an
ecosystem, and researchers tend to specialize and develop expertise in certain
taxonomic groups (hence the rationale for producing an ichthyology or any other
taxon-oriented textbook). For the purposes of the present discussion, we will
look at competitive and predator–prey interactions that tend to involve fishes
of different species, and discuss prevalent ideas on how assemblages are
structured and ordered, i.e., how interactions between fishes affect species
composition and maintenance of assemblages.
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