Phenology and fitness of Calanus glacialis, C. finmarchicus (Copepoda), and their hybrids in the St. Lawrence Estuary

Parent, Gérard; Plourde, Stéphane; Joly, Pierre Benoît; Turgeon, Jean

doi:10.3354/meps11240

Cited by 10 publications

(11 citation statements)

References 34 publications

(49 reference statements)

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“…However, these microsatellites were initially developed for C. finmarchicus only, for studying genetic differentiation among populations and were therefore not reliable tools to be applied to C. glacialis or to characterize hybrids. Furthermore, Parent et al (2012Parent et al ( , 2015 reported up to 50% of hybrids, suggested to be fertile in the Northwest Atlantic and Canadian Arctic. If true, this should quickly lead to large-scale introgression and ultimately to the formation of hybrid swarms (Perry et al 2001), especially given the short generation time of Calanus species.…”

Section: Hybridization Between C Finmarchicus and C Glacialismentioning

confidence: 99%

“…but also because of the reporting of hybridization between C. finmarchicus and C. glacialis. Indeed, recent studies based on microsatellite molecular markers suggested that C. finmarchicus and C. glacialis are able to interbreed and produce fertile hybrids at high rates (up to 50% of the Calanus community) in the northwestern Atlantic and the Canadian Arctic (Parent et al 2012(Parent et al , 2015. Microsatellite molecular markers are repetitive DNA sequences, with varying number of repetitions.…”

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confidence: 99%

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No evidence for hybridization between Calanus finmarchicus and Calanus glacialis in a subarctic area of sympatry

Choquet¹,

Burckard

Skreslet

et al. 2020

Limnology & Oceanography

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In the North Atlantic and the Arctic Ocean, four species of the copepod genus Calanus dominate the zooplankton biomass. Because of their morphological resemblance, knowledge of their respective distribution range has long been biased by misidentification, until the recent use of molecular tools uncovered numerous areas of sympatry. As hybridization between Calanus finmarchicus and Calanus glacialis has been claimed in the East-Canadian Arctic based on microsatellites, we investigated further the potential for interbreeding in newly uncovered areas of sympatry. Calanus species and stage composition were analyzed during winter in two Norwegian subarctic fjords, using molecular markers developed specifically for species identification and hybrid detection between C. finmarchicus and C. glacialis. Overall, C. glacialis were the most abundant throughout the winter, followed by C. finmarchicus and Calanus hyperboreus with only a few records of Calanus helgolandicus. The presence of C. glacialis, C. hyperboreus, and C. finmarchicus' nauplii was recorded, indicating that these species reproduce locally. In January and February, the simultaneous occurrence of males and females of both C. finmarchicus and C. glacialis suggested a potential for interspecies mating. However, genetic admixture tests performed on all 1126 individuals revealed no signal of hybridization, implying a strong reproductive isolation mechanism. We conclude that no evidence supports a potential for hybridization between C. finmarchicus and C. glacialis.

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Section: Hybridization Between C Finmarchicus and C Glacialismentioning

confidence: 99%

mentioning

confidence: 99%

No evidence for hybridization between Calanus finmarchicus and Calanus glacialis in a subarctic area of sympatry

Choquet¹,

Burckard

Skreslet

et al. 2020

Limnology & Oceanography

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“…Hybridization has often been observed in copepods. For example, hybrids between Calanus glacialis and C. finmarchicus were detected along the Atlantic and Arctic Canadian coast [55]. Another study also found that hybridization occurred between a female Neocalanus cristatus and a male N. plumchrus, and was then followed by backcrossing to a N. plumchrus individual [56].…”

Section: Discussionmentioning

confidence: 97%

Phylogeography and genetic diversity of the copepod family Cyclopidae (Crustacea: Cyclopoida) from freshwater ecosystems of Southeast Nigeria

Ebido

Odii

et al. 2020

BMC Evol Biol

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Background: Copepods are key components of aquatic ecosystems and can help regulate the global carbon cycle. Much attention has been paid to the species diversity of copepods worldwide, but the phylogeography and genetic diversity of copepods in Nigeria is unexplored. Results: Using a mitochondrial cytochrome c oxidase subunit I marker, we preformed phylogenetic and phylogeographic analyses for Cyclopidae copepods in Southeast Nigeria. A high species diversity of Cyclopidae in Nigeria: 5 species of Tropocyclops, 5 species of Mesocyclops and 2 species of Thermocyclops from Cyclopidae were identified in 15 populations. Moreover, we detected 18 unique haplotypes, which fell into two distinct clades. Pairwise genetic distances (uncorrected p-distances) among the species of Cyclopidae ranged from 0.05 to 0.257. Several species co-existed in the same lake, and some haplotypes were shared among different geographic populations, suggesting a dispersal of Cyclopidae in our sampling region. Finally, we found that the population genetic diversity for each species of Cyclopidae was low in Nigeria. Conclusions: Our findings explored the species diversity and distribution of copepods within the family Cyclopidae for 15 Nigerian freshwater ecosystems: a high species diversity of Cyclopidae copepods was detected over a small geographic sampling range. Results from this study contribute to a better understanding of copepod diversity of Nigerian freshwater ecosystems.

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“…Admixed individuals may also have an intermediate phenotype to that of parental species (reviewed in Goulet et al 2017). Parent et al (2015) observed that the reproductive phenology of admixed individuals was intermediate to that of C. finmarchicus and C. glacialis . Sampling active reproductive females between the peaks of species‐specific spawning may help to target admixed genotypes.…”

Section: Figmentioning

confidence: 99%

Defining what constitutes a reliable dataset to test for hybridization and introgression in marine zooplankton: Comment on Choquet et al. 2020 “No evidence for hybridization between Calanus finmarchicus and C. glacialis in a subarctic area of sympatry”

Parent

Plourde

Browman

et al. 2021

Limnology & Oceanography

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The article ‘No evidence for hybridization between Calanus finmarchicus and C. glacialis in a subarctic area of sympatry’ (Choquet et al. 2020) concludes that “no evidence supports a potential for hybridization between C. finmarchicus and C. glacialis”. We argue that the InDel markers used by Choquet et al. (2020) may have limited capacity to detect admixed genotypes between C. finmarchicus and C. glacialis due to an inappropriate choice of reference sample for each species during the marker development. We first review terms and concepts used in genetic classification using reference samples and describe problems associated with the selection of genetic markers in the context of possible hybridization. We reanalyze InDel genotypes provided with Choquet et al. (2017) and identified an admixed individual. We then contrast methods used by Choquet et al. (2017) and Parent et al. (2012) and explain how Parent et al. (2012) developed microsatellite markers capable of discriminating admixed genotypes from parental species. In this comment, we have identified a major issue that must be considered when selecting reference samples in the context of testing for possible hybridization.

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Phenology and fitness of Calanus glacialis, C. finmarchicus (Copepoda), and their hybrids in the St. Lawrence Estuary

Cited by 10 publications

References 34 publications

No evidence for hybridization between Calanus finmarchicus and Calanus glacialis in a subarctic area of sympatry

No evidence for hybridization between Calanus finmarchicus and Calanus glacialis in a subarctic area of sympatry

Phylogeography and genetic diversity of the copepod family Cyclopidae (Crustacea: Cyclopoida) from freshwater ecosystems of Southeast Nigeria

Defining what constitutes a reliable dataset to test for hybridization and introgression in marine zooplankton: Comment on Choquet et al. 2020 “No evidence for hybridization between Calanus finmarchicus and C. glacialis in a subarctic area of sympatry”

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