Genetic zoogeography of the Hyalella azteca species complex in the Great Basin: Rapid rates of molecular diversification in desert springs

Witt, Jessica K.; Threloff, Doug L.

doi:10.1130/2008.2439(05)

Cited by 17 publications

(24 citation statements)

References 32 publications

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“…Population genetic and metapopulation theory suggest that isolated populations should have lower effective population size and less genetic variation (Slatkin, 1987), although W. guzikae has the highest levels of genetic diversity in this study. The higher effective population size and haplotype diversity of W. guzikae suggest that, like other dispersal-limited taxa (Witt et al, 2008;Guzik et al, 2009), it persists by maintaining a high level of genetic diversity. Further study is required to determine the exact mechanisms, but it is likely that intrinsic genetic factors, such as a high rate of mutation (Woolfit, 2009), or extrinsic life history characteristics, such as increased reproductive potential (Bromham, 2009), are responsible.…”

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 96%

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The influence of landscape on population structure of four invertebrates in groundwater springs

Murphy¹,

Guzik²,

Wilmer³

2010

Freshwater Biology

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1. The unique aquatic fauna of the island-like groundwater springs of arid inland Australia raises important questions as to how aquatic species persist in very isolated and fragmented habitats and the role that dispersal may play in mitigating ⁄ mediating the influence of landscape structure and determining population structure. By determining the relationship between genetics and geography (i.e. phylogeography), the historical processes responsible for population structure can be determined. 2. We undertook comparative phylogeographic studies of invertebrates from springs south of Lake Eyre. Clusters of springs lying within and between surface drainage catchments (which provide a potential connection between springs) were sampled, and the phylogeographic structure of four coexisting species, an ostracod Ngarwa dirga, a snail Fonscochlea accepta, an isopod Phreatomerus latipes and an amphipod Wangiannachiltonia guzikae, was examined. 3. Clear differences in the geographic patterns of genetic structure were found amongst the four species. No discernable genetic structure was found in ostracod and snail populations, even amongst springs lying 20 km apart in separate surface catchments; isopod populations were highly genetically structured amongst springs located in separate catchments, but not within catchments, whilst amphipod populations were highly genetically structured amongst springs both within and between catchments. 4. The results suggest that differences in dispersal ability of each species, and not the overall fragmented nature of the springs, may have led to large differences in phylogeographic history. Interestingly, the relative dispersal ability of these species may be related to their vulnerability to and recovery from large-scale flood events. Therefore, despite the highly isolated and fragmented nature of the springs, the landscape has not strongly influenced the population structure of the aquatic invertebrate community as a whole nor has it led to the evolution of common life histories.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 96%

The influence of landscape on population structure of four invertebrates in groundwater springs

Murphy¹,

Guzik²,

Wilmer³

2010

Freshwater Biology

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“…However, recent genetic and ecological studies on H. azteca have revealed that this so-called species is a cryptic species complex: a group of genetically distinct species that are morphologically similar, but have been erroneously grouped together [8][9][10][11][12]. In particular, mitochondrial and nuclear gene sequencing have revealed that H. azteca is a complex of 85 divergent monophyletic lineages (clades) or phylogenetic species ( [8,9]; JDS Witt and GA Wellborn, unpublished data/ manuscript).…”

Section: Introductionmentioning

confidence: 99%

Implications of Cu and Ni toxicity in two members of the Hyalella azteca cryptic species complex: Mortality, growth, and bioaccumulation parameters

Leung¹,

Witt²,

Norwood

et al. 2016

Enviro Toxic and Chemistry

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Hyalella azteca, an amphipod crustacean, is frequently used in freshwater toxicity tests. Since the mid-1980s, numerous organizations have collected and established cultures of H. azteca originating from localities across North America. However, H. azteca is actually a large cryptic species complex whose members satisfy both the biological and the phylogenetic species concepts. Genetic analysis at the mitochondrial COI gene has revealed that only 2 clades are cultured in 17 North American laboratories; however, there are 85 genetically divergent lineages within this complex in the wild. In the present study, 2 members (clades 1 and 8) of the H. azteca species complex were identified using the mitochondrial COI gene. These 2 clades were exposed to Cu or Ni for 14 d. A saturation-based mortality model and the general growth model were used to determine mortality (lethal concentration, 25% and 50% [LC25 and LC50], lethal body concentration, 25% and 50% [LBC25 and LBC50]) and growth (inhibitory concentration, 25% [IC25, IBC25]) endpoints, respectively. A modified saturation-based model was used to estimate metal bioaccumulation parameters. Clade 8 was significantly more tolerant than clade 1, with differences in LC50s. However, the effects of the metals on growth were not significantly different between clades, even though clade 1 was significantly larger than then clade 8. Differences in Cu or Ni bioaccumulation were not observed between clades 1 and 8. The differences in Cu and Ni LC50s may have implications for risk assessments, and it is recommended that toxicity experiments should only be performed with properly identified members of the H. azteca complex to maintain consistency among laboratories. Environ Toxicol Chem 2016;35:2817-2826. © 2016 SETAC.

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“…in New Zealand and to apply evolutionary models, we used the mitochondrial cytochrome c oxidase subunit I (COI) gene. The COI gene has become an increasingly common marker for studies of intra‐ and interspecific variation (Hebert, Ratnasingham & deWaard, 2003), and has provided insights into ongoing evolutionary processes within taxa (Witt, Threloff & Hebert, 2008). Furthermore, population divergence times may be estimated from mitochondrial sequence divergence based on molecular clock calculations calibrated with known geological events (Knowlton & Weigt, 1998).…”

Section: Introductionmentioning

confidence: 99%

The role of vicariance and dispersal on New Zealand's estuarine biodiversity: the case of Paracorophium (Crustacea: Amphipoda)

Knox

Hogg

Pilditch

2011

Biological Journal of the Linnean Society

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To investigate the role of vicariance and dispersal on New Zealand's estuarine biodiversity, we examined variability in mitochondrial cytochrome c oxidase subunit I (COI) gene sequences for the amphipod genus Paracorophium. Individuals from the two nominate endemic species (Paracorophium excavatum and Paracorophium lucasi) were collected from sites throughout the North and South Islands. Sequence divergences of 12.8% were detected among the species. However, divergences of up to 11.7% were also observed between well supported clades, suggesting the possibility of cryptic species. Nested clade analyses identified four distinct lineages from within both P. excavatum and P. lucasi, with boundaries between clades corresponding to topographical features (e.g. Cook Straight, North and East Cape). Sequence divergences of 3.7-4.9% were also observed within geographic regions (e.g. east and west coasts of the upper North Island). Genetic structure in Paracorophium appears to represent prolonged isolation and allopatric evolutionary processes dating back to the Upper Miocene and continuing through the Pliocene and early Pleistocene. On the basis of molecular clock estimates from sequence divergences and reconstructions of New Zealand's geological past, we suggest that sea level and landmass changes during the early Pleistocene (2 Mya) resulted in the isolation of previously contiguous populations leading to the present-day patterns. COI genetic structure was largely congruent with previously observed allozyme patterns and highlights the utility of COI as an appropriate marker for phylogeographic studies of the New Zealand estuarine fauna.

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Genetic zoogeography of the Hyalella azteca species complex in the Great Basin: Rapid rates of molecular diversification in desert springs

Cited by 17 publications

References 32 publications

The influence of landscape on population structure of four invertebrates in groundwater springs

The influence of landscape on population structure of four invertebrates in groundwater springs

Implications of Cu and Ni toxicity in two members of the Hyalella azteca cryptic species complex: Mortality, growth, and bioaccumulation parameters

The role of vicariance and dispersal on New Zealand's estuarine biodiversity: the case of Paracorophium (Crustacea: Amphipoda)

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