Phylogenetic analysis of Hyalella colonization in lakes recovering from acidification and metal contamination

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Abstract:

The freshwater amphipod Hyalella azteca (Saussure, 1858) is common throughout North America and is a popular organism for toxicity tests and assessment of an ecosystem’s health. However, recent studies suggest that this “species” may actually be a number of closely related species, possibly with distinct habitat requirements. The region in and around Sudbury, Ontario, has many lakes recovering from acidification and metal contamination with Hyalella slowly recolonizing the area. Analyzing mitochondrial cytochrome c oxidase I (COI) sequences, we find two major groups of Hyalella: one group associated with recolonization of the central, historically more contaminated set of lakes and a second group associated with the more distant, less impacted, lakes. Morphologically, these inner city amphipods are significantly larger than those observed in lakes farther away from the city. This study may provide a foundation for a better understanding of Hyalella species complex, as well as colonization routes, toxicological sensitivities, habitat requirements, and dispersal capabilities.

Keywords: Hyalella azteca; acidification; amphipod; amphipode; amélioration de la qualité des lacs; colonizing species; espèces colonisatrices; industrial pollution; lake recovery; pollution industrielle

Document Type: Research Article

DOI: http://dx.doi.org/10.1139/z2012-028

Affiliations: 1: Department of Biology, Laurentian University, Sudbury, ON P3E 3C6, Canada. 2: Department of Chemistry and Biochemistry, Laurentian University, Sudbury, ON P3E 2C6, Canada.

Publication date: May 15, 2012

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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