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A Case of Phoresis of Sphaeriids by Corixids: First Report for the Americas

D. Zelaya,M. C. Marinone

Published 2012 in Unknown venue

ABSTRACT

Dispersal represents a key process in determining the genetic structure and demography of populations. This process reduces competition among siblings, reduces competition between parents and offspring, reduces the likelihood of inbreeding, increases recolonization following local extinctions, also decreasing the risk of local extinction (Pechenik, 1999). Similarly, the modes of reproduction and dispersal can play a major role in species longevity, geographic distribution, and rate of speciation (Mayr, 1970; Stanley, 1979). In freshwater bivalves, a free-living larval stage is frequently suppressed; consequently, the dispersal of a species relies on the capacities of juvenile and adult stages. Dispersal mechanisms include rafting (i.e., the transport of an organism on a drifting object); currentmediated dispersal of juveniles suspended in water (McKillop & Harrison, 1982); airborne dispersal (anemochory) of juveniles and adults (e.g., hurricanes, tornadoes, and other twisters) (Rees, 1965, and references therein); and dispersal by biotic (either natural or anthropogenic) vectors, with vertebrates or invertebrates acting as carriers (Kappes & Haase, 2012, and references therein).

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