Colonization and persistence of Crangonyx pseudogracilis (Bousfield 1958) in temporary pools
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Crangonyx Pseudogracilis (Bousfield 1958)
Journal titleThe University of Chicago Press on behalf of Society for Freshwater Science
MetadataShow full item record
AbstractCrangonyctid amphipods occupy temporary habitats across northeastern North America, but they are mostly known as permanent-water species. Crangonyx pseudogracilis (Bousfield 1958) is found at high densities in temporary pools in western New York, but the means by which it persists are not well understood. Our objectives were to: 1) assess the dispersal abilities of C. pseudogracilis, 2) explore its ability to descend through inundated porous substrates, 3) assess whether its life cycle and brood releases are related to survival through the dry season, and 4) find their dry-season refugia and measure the period for which they can survive desiccation. During periods of inundation, C. pseudogracilis was found in the top 15 cm of soil in holes <10 m from pools. After pools dried in mid-June or early July, C. pseudogracilis was not found in the soil to a depth of 45 cm, even when rains temporarily refilled the pools. In the laboratory, small C. pseudogracilis descended easily through substrates with ? 0.7-mm pore radii but large (? 7 mm) and ovigerous C. pseudogracilis were unable to descend. In the field, ovigerous females were found from mid-March until late May. The previous year’s generation of large and ovigerous individuals began dying in May and was gone by the end June. In the laboratory, C. pseudogracilis survived in damp soil (51% average free moisture content) for 15 wk. Crangonyx pseudogracilis lacks specialized strategies for survival in temporary waters (e.g., resting eggs, dormant juvenile stages, active burrowing), but has ecological traits well suited for temporary pools and similar environments
CitationB.C. Disalvo and J.M. Haynes. 2015. Colonization and persistence of Crangonyx pseudogracilis (Bousfield 1958) in temporary pools. Freshwater Science. Vol. 34, No. 2 (June 2015), pp. 547-554. DOI: 10.1086/680986
DescriptionThe published article in a non-commercial data repository maintained by an institution of which the author(s) are a member, provided the school meets all relevant conditions described in the Guidelines and in the editorial office’s communications with the author(s). An institutional repository, as distinguished from the author(s) personal or departmental web site, is designed for the systematic storage, retrieval, and delivery of scholarly material. The author(s) article may be made publicly available after the appropriate embargo period* has been observed. The author(s) are responsible for informing the manager of the institutional repository of the embargo period that must be observed. *The embargo period is twelve (12) months unless otherwise required by mandate. --- We thank Patricia Harris for her guidance in the original design of this project, Patrick Bellanca who helped set up sampling sites in the dead of winter in 2002–2003, and the autumn 2007 graduate seminar class for collecting 15 difficult core samples.