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Article
Published: 2019-06-06

The most latent cladoceran in the Holarctic revealed—sinking Unapertura Sarmaja-Korjonen, Hakojärvi & Korhola, 2000 into the genus Rhynchotalona Norman, 1903 (Branchiopoda: Cladocera: Chydoridae)

Senckenberg Research Institute and Museum of Nature, Senckenberganlage 25, 60325 Frankfurt a.M., Germany. Tvärminne Zoological Station, University of Helsinki, J. A. Palménin tie 260, 10900 Hanko, Finland
Ecosystems and Environment Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Niemenkatu 73, 15140 Lahti, Finland
Crustacea Unapertura latens Rhynchotalona taxonomy Cladocera Finland Arctic-Alpine distribution

Abstract

The morphology of one of the smallest chydorid cladocerans in the world, Unapertura latens Sarmaja-Korjonen, Hakojärvi & Korhola, 2000 (Branchiopoda: Cladocera: Anomopoda) is studied herein. External features and postabdomen of the adult parthenogenetic female are discussed in detail for the first time, based on an intact specimen from northern Finland. Originally described on Quaternary fossil remains, we investigate the validity of the monotypic genus Unapertura and its position within the Aloninae subfamily, in particular in relation to Rhynchotalona Norman, 1903. As a result, we rename the taxon as Rhynchotalona latens comb. nov., based on morphology. The species, a glacial relict, seems one of the rarest cladocerans in contemporary waters in Finland, yet intact specimens are clearly overlooked and recent remains in surface sediments suggest an Arctic-Alpine distribution in oligotrophic habitats in the Holarctic.

 

References

  1. Alonso, M. (1996) Crustacea, Branchiopoda. Vol. 7. Fauna Iberica. Museo Nacional de Ciencias Naturales, Consejo Superior de Investigaciones Cientificas, Madrid, 486 pp.

    Bigler, C., Heiri, O., Krskova, R., Lotter, A.F. & Sturm, M. (2006) Distribution of diatoms, chironomids and cladocera in surface sediments of thirty mountain lakes in south-eastern Switzerland. Aquatic Sciences, 68, 154–171.

    https://doi.org/10.1007/s00027-006-0813-x

    Cotten, C.A. (1985) Cladoceran assemblages related to lake conditions of Eastern Finland. Unpublished Ph.D. Thesis, Department of Biology, University of Indiana, Bloomington, 96 pp.

    Fryer, G. (1968) Evolution and adaptive radiation in the Chydoridae (Crustacea: Cladocera): a study of comparative functional morphology and ecology. Philosophical Transactions of the Royal Society of London, Series B, 254, 221–385.

    https://doi.org/10.1098/rstb.1968.0017

    Kattel, G.R., Dong, X. & Yang, X. (2015) A century scale human-induced hydrological and ecological changes of wetlands of two large river basins in Australia (Murray) and China (Yangtze): development of an adaptive water resource management framework. Hydrology and Earth System Sciences Discussions, 12, 8247–8287.

    https://doi.org/10.5194/hessd-12-8247-2015

    Korhola, A. (1992) The Early Holocene hydrosere in a small acid hill-top basin studied using crustacean sedimentary remains. Journal of Paleolimnology, 7, 1–22.

    https://doi.org/10.1007/BF00197028

    Kotov, A.A. & Sinev, A.Y. (2011) Cladocera (Crustacea, Branchiopoda) from the Zeya River Basin (Amur region, Russia). 2. Description of new taxa. Zoologicheskii zhurnal, 90, 272–284. [in Russian]

    Luoto, T.P., Nevalainen, L. & Sarmaja-Korjonen, K. (2013) Zooplankton (Cladocera) in assessments of biologic integrity and reference conditions: application of sedimentary assemblages from shallow boreal lakes. Hydrobiologia, 707, 173–185.

    https://doi.org/10.1007/s10750-012-1422-4

    Milan, M., Bigler, C., Tolotti, M. & Szeroczyńska, K. (2017) Effects of long term nutrient and climate variability on subfossil Cladocera in a deep, subalpine lake (Lake Garda, northern Italy). Journal of Paleolimnology, 58, 335–351.

    https://doi.org/10.1007/s10933-017-9981-z

    Muster, C. & Berendonk, T.U. (2006) Divergence and diversity: lessons from an arctic-alpine distribution (Pardosa saltuaria group, Lycosidae). Molecular Ecology, 15, 2921–2933.

    https://doi.org/10.1111/j.1365-294X.2006.02989.x

    Nevalainen L. (2008) Sexual reproduction in chydorid cladocerans (Anomopoda, Chydoridae) in southern Finland—implications for paleolimnology. Ph.D. thesis. Publications of the Department of Geology D16, University of Helsinki, Helsinki, 54 pp. [http://ethesis.helsinki.fi/]

    Nevalainen, L., Luoto, T.P., Kultti, S. & Sarmaja-Korjonen, K. (2013) Spatio-temporal distribution of sedimentary Cladocera (Crustacea: Branciopoda) in relation to climate. Journal of Biogeography, 40, 1548–1559.

    https://doi.org/10.1111/jbi.12101

    Nevalainen, L., Rantala, M.V., Rautio, M. & Luoto, T.P. (2018) Spatio-temporal cladoceran (Branchiopoda) responses to climate change and solar radiation in subarctic ecotonal lakes. Journal of Biogeography, 45, 1954–1965.

    https://doi.org/10.1111/jbi.13371

    Petrusek, A., Černy, M., Mergeay, J. & Schwenk, K. (2007) Daphnia in the Tatra Mountain lakes: multiple colonisation and hidden species diversity revealed by molecular markers. Fundamental and Applied Limnology, 169, 279–291.

    https://doi.org/10.1127/1863-9135/2007/0169-0279

    Petrusek, A., Hobżk, A., Nilssen, J.P., Skage, M., Černý, M., Brede, N. & Schwenk, K. (2008) A taxonomic reappraisal of the European Daphnia longispina complex (Crustacea, Cladocera, Anomopoda). Zoologica Scripta, 37, 507–519.

    https://doi.org/10.1111/j.1463-6409.2008.00336.x

    Røen, U. (1973) Rhynchotalona kistarae sp.n. from South Greenland (Crustacea, Cladocera, Chydoridae, Aloninae). Steenstrupia, 3, 89–92.

    Sarmaja-Korjonen, K., Hakojärvi, M. & Korhola, A. (2000) Subfossil remains of an unknown chydorid (Anomopoda: Chydoridae) from Finland. Hydrobiologia, 436, 165–169.

    https://doi.org/10.1023/A:1026502219867

    Sarmaja-Korjonen, K. & Sinev, A.Y. (2008) First records of Alona werestschagini Sinev in Finland—subfossil remains from subarctic lakes. Studia Quaternaria, 25, 43–46.

    Schmitt, T., Muster, C. & Schönswetter, P. (2010) Are Disjunct Alpine and Arctic-Alpine Animal and Plant Species in the Western Palearctic Really “Relics of a Cold Past”? In: Habel, J.C & Assmann, T. (Eds.), Relict Species: Phylogeography and Conservation Biology. Springer, Berlin Heidelberg, pp. 239–252.

    https://doi.org/10.1007/978-3-540-92160-8_13

    Schönswetter, P., Paun, O., Tribsch, A. & Niklfeld, H. (2003) Out of the Alps: colonization of Northern Europe by East Alpine populations of the Glacier Buttercup Ranunculus glacialis L. (Ranunculaceae). Molecular Ecology, 12, 3373–3381.

    https://doi.org/10.1046/j.1365-294X.2003.01984.x

    Sienkiewicz, E. & Gąsiorowski, M. (2016) The effect of fish stocking on mountain lake plankton communities identified using palaeobiological analyses of bottom sediment cores. Journal of Paleolimnology, 55, 129–150.

    https://doi.org/10.1007/s10933-015-9870-2

    Sinev, A.Y. & Kotov, A.A. (2014) Revision of the Holarctic genus Rhynchotalona Norman, 1903 (Anomopoda: Chydoridae). Zootaxa, 3841 (2), 188–210.

    https://doi.org/10.11646/zootaxa.3841.2.2

    Sweetman, J. & Sarmaja-Korjonen, K. (2017) First evidence for the occurrence of Unapertura spp. (Crustacea, Branchiopoda, Anomopoda, Chydoridae) in North America based on subfossil remains. Journal of Paleolimnology, 58, 291–297

    https://doi.org/10.1007/s10933-017-9978-7

    Sweetman, J., Rühland, K.M. & Smol, J.P. (2010) Environmental and sptial factors influencing the distribution of cladocerans in lakes across the central Canadian Arctic treeline region. Journal of Limnology, 69, 76–87.

    https://doi.org/10.4081/jlimnol.2010.76

    Szeroczyńska, K. & Sarmaja-Korjonen, K. (2007) Atlas of Subfossil Cladocera from Central and Northern Europe. Friends of the Lower Vistula Society, Świecie, 84 pp.

    The Recently Extinct Plants and Animals Database (2018) Available from: https://www.recentlyextinctspecies.com/ (accessed 29 December 2018)

    Van Damme, K., Elías-Gutíerrez, M. & Dumont, H.J. (2011) Three rare European “Alona” taxa (Branchiopoda: Cladocera: Chydoridae), with notes on distribution and taxonomy. Annales de Limnologie—International Journal of Limnology, 47, 45–63.

    https://doi.org/10.1051/limn/2010034

    Van Damme, K., Kotov, A.A. & Dumont, H.J. (2010) A checklist of names in Alona Baird 1843 (Crustacea: Cladocera: Chydoridae) and their current status: an analysis of the taxonomy of a lump genus. Zootaxa, 2330, 1–63.

    Zuykova, E.I., Simonov, E.P., Bochkarev, N.A., Taylor, D.J. & Kotov, A.A. (2018) Resolution of the Daphnia umbra problem (Crustacea: Cladocera) using an integrated taxonomic approach. Zoological Journal of the Linnean Society, 184, 969–998.

    https://doi.org/10.1093/zoolinnean/zly015