Reproductive and phylogenetic divergence of tidepool copepod populations across a narrow geographical boundary in Baja California

Peterson, D. L.; Kubow, Karen B.; Connolly, Maren J.; Kaplan, Laran; Wetkowski, Melissa M.; Leong, Wai; Phillips, Barret C.; Edmands, Suzanne

doi:10.1111/jbi.12107

Cited by 51 publications

(58 citation statements)

References 46 publications

(66 reference statements)

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“…Our results are in agreement with previous phylogenetic trees estimated from mitochondrial genes alone (Willett & Ladner ; Peterson et al . ), except that we now find strong support for deeper nodes that were previously unresolved.…”

Section: Resultssupporting

confidence: 44%

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Transcriptome‐wide patterns of divergence during allopatric evolution

et al. 2016

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Recent studies have revealed repeated patterns of genomic divergence associated with species formation. Such patterns suggest that natural selection tends to target a set of available genes, but is also indicative that closely related taxa share evolutionary constraints that limit genetic variability. Studying patterns of genomic divergence among populations within the same species may shed light on the underlying evolutionary processes. Here, we examine transcriptome-wide divergence and polymorphism in the marine copepod Tigriopus californicus, a species where allopatric evolution has led to replicate sets of populations with varying degrees of divergence and hybrid incompatibility. Our analyses suggest that relatively small effective population sizes have resulted in an exponential decline of shared polymorphisms during population divergence and also facilitated the fixation of slightly deleterious mutations within allopatric populations. Five interpopulation comparisons at three different stages of divergence show that nonsynonymous mutations tend to accumulate in a specific set of proteins. These include proteins with central roles in cellular metabolism, such as those encoded in mtDNA, but also include an additional set of proteins that repeatedly show signatures of positive selection during allopatric divergence. Although our results are consistent with a contribution of nonadaptive processes, such as genetic drift and gene expression levels, generating repeatable patterns of genomic divergence in closely related taxa, they also indicate that adaptive evolution targeting a specific set of genes contributes to this pattern. Our results yield insights into the predictability of evolution at the gene level.

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Section: Resultssupporting

confidence: 44%

“…For visualization purposes, we rooted the tree based on a species‐scale phylogeny of Tigriopus californicus (Peterson et al . ). We estimated interpopulation divergence by calculating uncorrected P ‐distances for each locus with trimmed alignments >100 bp (11 560 nuclear loci) and averages across loci.…”

Section: Methodsmentioning

confidence: 97%

Transcriptome‐wide patterns of divergence during allopatric evolution

et al. 2016

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“…If both sterility and inviability evolve at similar rates in both sexes, the IPI index will remain at 0, and will go to either 0.5 due to uniparentally inherited factors or 1 due to autosomal incompatibilities, mostly skipping the IPI index values of 0.25 and 0.75. This is precisely what is seen in Tigriopus californicus, where crosses between any two populations are fully compatible (IPI index of 0), unidirectionally compatible (IPI index of 0.5) or fully incompatible (IPI index of 1), in which case F 1 hybrids of both sexes are sterile in one direction and inviable in the other 33,34 . Such a pattern indicates that uniparentally inherited factors (likely cyto-nuclear incompatibilities in this case 35 ) may be of special importance for the formation of IPI in taxa without sex chromosomes.…”

Section: Discussionmentioning

confidence: 79%

Higher levels of sex chromosome heteromorphism are associated with markedly stronger reproductive isolation

Lima

2014

Nat Commun

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The two 'rules of speciation', Haldane's rule and the large X-effect, describe the genetic basis of postzygotic isolation, and have led to the realization that sex chromosomes play an important role in this process. However, a range of sex determination mechanisms exists in nature, not always involving sex chromosomes. Based on these 'rules of speciation', I test the hypothesis that the presence of sex chromosomes will contribute to a faster evolution of intrinsic postzygotic isolation. I show that taxa that do not have sex chromosomes evolve lower levels of postzygotic isolation than taxa with sex chromosomes, at a similar amount of genetic divergence. Taxa with young homomorphic sex chromosomes show an intermediate pattern compared to taxa with heteromorphic sex chromosomes and taxa without sex chromosomes. These results are consistent with predictions from the two 'rules of speciation', and emphasize the importance of sex chromosomes for the evolution of intrinsic postzygotic isolation.

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“…Sequences of the mitochondrial cytochrome oxidase I (COI) gene have been shown to be very useful for distinguishing calanoid and harpacticoid copepods including cryptic and sibling species in biogeographic studies (Gutierrez-Aguirre et al, 2014; Laakmann et al, 2013; Miracle et al, 2013; Peterson et al, 2013). Previous genetic analyses of the COI gene in Eurytemora populations described specimens from the Great Lakes as belonging to an Atlantic clade of E. affinis (Lee and Frost, 2002; Winkler et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Eurytemora carolleeae in the Laurentian Great Lakes revealed by phylogenetic and morphological analysis

Vasquez

Hudson

Fujimoto

et al. 2016

Journal of Great Lakes Research

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In the Laurentian Great Lakes, specimens of Eurytemora have been reported as E. affinis since its invasion in the late 1950s. During an intensive collection of aquatic invertebrates for morphological and molecular identification in Western Lake Erie in 2012-2013, several specimens of Eurytemora were collected. Analysis of these specimens identified them as the recently described species E. carolleeae Alekseev and Souissi 2011. This result led us to assess E. carolleeae's identifying features, geographic distribution and historical presence in the Laurentian Great Lakes in view of its recent description in 2011. Cytochrome oxidase I (COI) DNA sequences of Eurytemora specimens were identified as closer (2 - 4% different) to recently described E. carolleeae than to most Eurytemora affinis sequences (14% different). Eurytemora from other areas of the Great Lakes and from North American rivers as far west as South Dakota (Missouri River) and east to Delaware (Christina River) also keyed to E. carolleeae. Morphological analysis of archival specimens from 1962 and from all the Great Lakes were identified as E. carolleeae. Additionally, Eurytemora drawings in previous publications from studies in the Holarctic region were reassessed to determine if these specimens were E. carolleeae. Additional morphological characters that may distinguish the North American E. carolleeae from other taxa are also described. We conclude that E. carolleeae is the correct name for the species of Eurytemora that has inhabited the Great Lakes since its invasion, as established by both morphological and COI sequence comparisons to reference keys and sequence databases in present and archival specimens.

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Reproductive and phylogenetic divergence of tidepool copepod populations across a narrow geographical boundary in Baja California

Cited by 51 publications

References 46 publications

Transcriptome‐wide patterns of divergence during allopatric evolution

Transcriptome‐wide patterns of divergence during allopatric evolution

Higher levels of sex chromosome heteromorphism are associated with markedly stronger reproductive isolation

Eurytemora carolleeae in the Laurentian Great Lakes revealed by phylogenetic and morphological analysis

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