Genetic structure and relationships among populations ofHyalella aztecaandH.montezuma(Crustacea:Amphipoda)

Duan, Yihao; Guttman, Sheldon I.; Oris, James T.; Bailer, A. John

doi:10.2307/1468073

Cited by 16 publications

(12 citation statements)

References 31 publications

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“…While sample sizes for each laboratory were generally small (2–6 individuals per laboratory), the consistency of this finding over 15 laboratories supports the assertion that the laboratory cultures analyzed were all homogenous at the species‐level. Using allozymes, Duan et al also observed that 3 US Laboratory populations used in the present study (US Environmental Protection Agency [USEPA] Ecological Exposure Research Division [Cincinnati, OH, USA], USEPA Mid‐Continental Ecology Division [Duluth, MN, USA], US Geological Survey Columbia Environmental Research Center [Columbia, MO, USA]) had profiles that were different at the species level from those of the Burlington population (CCIW). The Babin‐Fenske et al COI sequence fragments of the CCIW laboratory organisms were similar to those reported in the present study for CCIW (maximum divergence = 4.6%), placing them in the group we identify as the Burlington clade.…”

Section: Discussionsupporting

confidence: 59%

The common ecotoxicology laboratory strain of Hyalella azteca is genetically distinct from most wild strains sampled in Eastern North America

Major

Soucek

Giordano

et al. 2013

Enviro Toxic and Chemistry

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The amphipod Hyalella azteca is commonly used as a model for determining safe concentrations of contaminants in freshwaters. The authors sequenced the mitochondrial cytochrome c oxidase subunit I (COI) gene for representatives of 38 populations of this species complex from US and Canadian toxicology research laboratories and eastern North American field sites to determine their genetic relationships. With 1 exception, all US and Canadian laboratory cultures sampled were identified as conspecific. In 22 wild populations spanning 5 US states and 1 Canadian province, the commonly occurring laboratory species was found only in northern Florida, USA. Therefore, the diversity of the H. azteca species complex detected in the wild is not accurately represented in North American laboratories, questioning the reliability of H. azteca cultures currently in use to accurately predict the responses of wild populations in ecotoxicological assays. The authors also examined the utility of different COI nucleotide fragments presently in use to determine phylogenetic relationships in this group and concluded that saturation in DNA sequences leads to inconsistent relationships between clades. Amino acid sequences for COI were not saturated and may allow a more accurate phylogeny estimate. Hyalella azteca is crucial for developing water-quality regulations; therefore, laboratories should know and standardize the strain(s) they use to confidently compare toxicity tests across laboratories and determine whether they are an appropriate surrogate for their regions.

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Section: Discussionsupporting

confidence: 59%

The common ecotoxicology laboratory strain of Hyalella azteca is genetically distinct from most wild strains sampled in Eastern North America

Major

Soucek

Giordano

et al. 2013

Enviro Toxic and Chemistry

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“…unicellular microbes and detritus; Hargrave, 1969). Furthermore, invertebrate herbivory on the roots of freshwater macrophytes is not well documented and this type of root diet is atypical for Hyalella (Pickard & Benke, 1996; Duan, Guttman & Oris, 2000) .…”

Section: Discussionmentioning

confidence: 99%

Herbivory on a chemically defended plant as a predation deterrent in Hyalella azteca

Rowell

Blinn

2003

Freshwater Biology

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SUMMARY 1. We investigated whether a population of the freshwater amphipod, Hyalella azteca, which consumed plants with defensive secondary compounds, reduced predation as reported for terrestrial and marine systems. 2. Field observations in Montezuma Well, U.S.A., indicated a strong association between the emergent macrophyte, Berula erecta and H. azteca. We hypothesised that this geographically isolated population of sedentary amphipods was able to consume roots of the chemically defended B. erecta as a deterrent against predation. Berula erecta is in the family Apiaceae, which commonly produce coumarins that deter herbivory in terrestrial systems. 3. Hyalella azteca consumed roots of B. erecta at a significantly greater rate than alternative macrophyte substrata in Montezuma Well. Additionally, H. azteca moulted at a significantly higher rate when consuming B. erecta compared with a diet of periphyton. 4. Two insect predators (Telebasis salva and Belostoma bakeri) with different feeding strategies were used to assess the effects of a B. erecta diet on predation rates in the laboratory and in Montezuma Well. Hyalella azteca was preyed on at a significantly lower rate by both predators when given a strict diet of B. erecta roots compared with a diet of periphyton. 5. This is the first experimental evidence that predation on a freshwater herbivore, H. azteca, was reduced when it consumed a chemically defended plant.

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“…1994, 1997). In addition, an allozyme study suggested that H. montezuma has a closer genetic affinity with an H. ‘ azteca ’ population in Ohio than several H. ‘ azteca ’ populations have with each other (Duan et al . 2000).…”

Section: Introductionmentioning

confidence: 99%

The recent evolutionary origin of the phenotypically novel amphipodHyalella montezumaoffers an ecological explanation for morphological stasis in a closely allied species complex

Witt

Blinn²,

Hebert

2003

Molecular Ecology

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Numerous molecular studies have identified morphologically cryptic, freshwater invertebrate species, but have not suggested possible mechanisms for their phenotypic stasis. The amphipod crustacean genus Hyalella contains numerous morphologically cryptic species in the H. azteca complex, as well as a small number of morphologically very divergent, narrowly endemic taxa. One such taxon, Hyalella montezuma, is the sole planktonic filter-feeder within the North American amphipod fauna, and is known only from Montezuma Well, a fishless travertine spring mound in Arizona, USA. In this study, we conduct a phylogenetic analysis of mtDNA sequence data using likelihood, Bayesian and cladistic approaches to determine both the relationship of H. montezuma to the H. 'azteca' species complex, and to ascertain if its morphological and ecological differentiation have been comparatively recent. The results show that H. montezuma has a very close phylogenetic affiliation with one lineage in the H. azteca complex, indicating that its origin has been recent. We present evidence suggesting that fish predation is an important ecological factor, which constrains morphological and ecological diversification within the genus Hyalella, and that Montezuma Well has provided a relaxation on this constraint.

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Genetic structure and relationships among populations ofHyalella aztecaandH.montezuma(Crustacea:Amphipoda)

Cited by 16 publications

References 31 publications

The common ecotoxicology laboratory strain of Hyalella azteca is genetically distinct from most wild strains sampled in Eastern North America

The common ecotoxicology laboratory strain of Hyalella azteca is genetically distinct from most wild strains sampled in Eastern North America

Herbivory on a chemically defended plant as a predation deterrent in Hyalella azteca

The recent evolutionary origin of the phenotypically novel amphipodHyalella montezumaoffers an ecological explanation for morphological stasis in a closely allied species complex

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