Genetics redraws pelagic biogeography of<i>Calanus</i>

Choquet, Marvin; Hatlebakk, Maja; Dhanasiri, Anusha K. S.; Kosobokova, Ksenia; Smolina, Irina; Søreide, Janne E.; Svensen, Camilla; Melle, Webjørn; Kwaśniewski, Sławomir; Eiane, Ketil; Daase, Malin; Tverberg, Vigdis; Skreslet, Stig; Bucklin, Ann; Hoarau, Galice

doi:10.1098/rsbl.2017.0588

Cited by 68 publications

(120 citation statements)

References 26 publications

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“…This large-scale investigation revealed the occurrence, sometimes in high proportions, of some of the species in areas where they had not been reported before (Choquet et al 2017). In particular, several regions of cooccurrence between C. finmarchicus and C. glacialis were unveiled, or confirmed from previous molecular-based studies in boreal and subarctic fjords (Lindeque et al 2004;Choquet et al 2017). There, both species cooccur in similar proportions but they are so morphologically alike that only genetics can distinguish the two species (Choquet et al 2018).…”

supporting

confidence: 68%

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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supporting

confidence: 68%

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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“…Additionally, Arctic zooplankton may face increased competition if the extended growth season allows faster‐growing boreal species such as C. finmarchicus to penetrate further into the central Arctic (Wassmann et al., ). Meanwhile, C. hyperboreus coexists with boreal congeners in regions such as the Norwegian Sea and fjords (Choquet et al., ), where it displays a shorter life cycle (Falk‐Petersen et al., ) and smaller size (M. Choquet, pers. comm.)…”

Section: Discussionmentioning

confidence: 99%

“…show that although the central Arctic basins are considered its core habitat (Choquet et al, 2017;Conover, 1988;Falk-Petersen et al, 2009), abundances are higher in relatively lower-latitude regions with increased food availability. Nevertheless, C. hyperboreus' high resilience and responsiveness to environmental fluctuations allow the life cycle to be completed in the central Arctic basins and may enable this copepod to rapidly respond to improved growth conditions under climate change.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, the species is regarded as a true Arctic endemic with core habitats in deep-water areas of the Greenland Sea, Fram Strait, Labrador Sea, Baffin Bay, and the central Arctic Ocean (Conover, 1988;Falk-Petersen et al, 2009). However, the known distributional range of C. hyperboreus is based on few studies (Choquet et al, 2017), and it has conversely been suggested that the species may be an expatriate in the central Arctic Ocean basins. Field campaigns have observed reduced abundances in the central Arctic basins relative to surrounding areas (Hirche, 1991;Hirche & Mumm, 1992;Kosobokova & Hirche, 2009), particularly of early copepodid stages (Dawson, 1978;Kosobokova et al, 1998;Lane, Llinás, Smith, & Pilz, 2008;Olli et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Pushing the limit: Resilience of an Arctic copepod to environmental fluctuations

Kvile

Ashjian

Feng

et al. 2018

Global Change Biology

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Life history strategies such as multiyear life cycles, resting stages, and capital breeding allow species to inhabit regions with extreme and fluctuating environmental conditions. One example is the zooplankton species Calanus hyperboreus, whose life history is considered an adaptation to the short and unpredictable growth season in the central Arctic Ocean. This copepod is commonly described as a true Arctic endemic; however, by statistically analyzing compiled observational data, we show that abundances are relatively low and later stages and adults dominate in the central Arctic Ocean basins, indicating expatriation. Combining data analyses with individual-based modeling and energy requirement estimation, we further demonstrate that while C. hyperboreus can reach higher abundances in areas with greater food availability outside the central Arctic basins, the species' resilience to environmental fluctuations enables the life cycle to be completed in the central Arctic basins. Specifically, the energy level required to reach the first overwintering stage-a prerequisite for successful local production-is likely met in some-but not all-years. This fine balance between success and failure indicates that C. hyperboreus functions as a peripheral population in the central Arctic basins and its abundance will likely increase in areas with improved growth conditions in response to climate change. By illustrating a key Arctic species' resilience to extreme and fluctuating environmental conditions, the results of this study have implications for projections of future biogeography and food web dynamics in the Arctic Ocean, a region experiencing rapid warming and sea ice loss.

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“…finmarchicus and C. glacialis and that these species widely co-occur, particularly within fjord environments (Choquet et al, 2017(Choquet et al, , 2018. Smolina et al (2015) incorporated this consideration into their methodology, using genetic techniques to verify species identity before pooling RNA from multiple individuals and measuring gene expression.…”

Section: Genetic Complexitymentioning

confidence: 99%

Molecular physiology of copepods - from biomarkers to transcriptomes and back again

Tarrant

Nilsson

Hansen

2019

Comparative Biochemistry and Physiology Part D: Genomics and Pr

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Planktonic copepods are a diverse and abundant group of small (⁓mm sized) aquatic animals that play a critical role in linking the base of the food chain with higher trophic levels. These invertebrates are a primary food source for marine fish larvae. Their ubiquitous presence is thus of vital importance for recruitment of fish stocks and also as promising live feed for finfish production in aquaculture. This paper reviews the application of molecular approaches to understanding copepod physiology, particularly in non-parasitic species. The review includes both targeted gene approaches and untargeted transcriptomic approaches, with suggestions for best practices in each case. Issues particularly relevant to studies of copepods include heterogeneity within species, morphologically cryptic species, experimental artifacts associated with sample handling, and limited annotation of copepod genes and transcripts. The emergence of high-throughput sequencing and associated increased availability of genomic and transcriptomic databases has presented a huge opportunity to advance knowledge of copepod physiology. The research community can leverage this opportunity through efforts to maintain or improve data accessibility, database annotation, and documentation of analytical pipelines.

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Genetics redraws pelagic biogeography ofCalanus

Cited by 68 publications

References 26 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

Pushing the limit: Resilience of an Arctic copepod to environmental fluctuations

Molecular physiology of copepods - from biomarkers to transcriptomes and back again

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