Birds, nutrients, and climate change: mtDNA haplotype diversity of Arctic Daphnia on Svalbard revisited
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Ecosystems in the high Arctic are in transition due to climate change and species shifts. On the Svalbard archipelago, the average annual temperature has increased by more than 2 °C over the past 30 years, and there has been a striking increase in breeding populations of geese. Birds serve as a dominant source of nutrients (via faeces) and may also serve as vectors of dispersal of many small aquatic organisms. We compared samples of species and haplotype composition of the dominant freshwater crustacean Daphnia spp., from 1992, and those resampled in 2014 to see if these major impacts on Arctic freshwater ecosystems may also have affected this key grazer over the past three decades. The study covers tundra ponds that vary in levels of nutrients, abundance, and diversity of birds. Comparison of genetic mitochondrial DNA sequences revealed little change in haplotype and nucleotide diversity between 1992 and 2014, but higher species and haplotype diversity were found in nutrient-rich ponds that hosted large migratory bird populations. This could either reflect that high nutrient levels allow for the maintenance of higher levels of genetic diversity (i.e. haplotypes, lineages), that birds serve as vectors for the dispersal of clones, or likely a combination of both mechanisms.
KeywordsArctic Svalbard Climate change Bird influence Daphnia Genetic diversity
The collection of samples on Svalbard in 2014 was done during an expedition funded by the Polish-Norwegian Research Programme operated by the National Centre for Research and Development under the Norwegian Financial Mechanism 2009–2014 in the frame of Project Contract No. Pol-Nor/201992/93/2014. The authors also acknowledge the funding sources (see Weider and Hobæk 1994) that allowed for the 1992 sample collection expedition. We thank three anonymous reviewers for their constructive comments on earlier versions of the manuscript.
- Carlson RE, Simpson J (1996) A coordinator’s guide to volunteer lake monitoring methods. North American Lake Management Society, MadisonGoogle Scholar
- Colbourne JK, Crease TJ, Weider LJ, Hebert PD, Duferesne F, Hobaek A (1998) Phylogenetics and evolution of a circumarctic species complex (Cladocera: Daphnia pulex). Biol J Linn Soc 65:347–365Google Scholar
- Fox AD, Ebbinge BS, Mitchell C, Heinicke T, Aarvak T, Colhoun K, Clausen P, Dereliev S, Faragó S, Koffijberg K, Kruckenberg H (2010) Current estimates of goose population sizes in western Europe, a gap analysis and an assessment of trends. Ornis Svecica 20:115–127Google Scholar
- IPCC (2007) Summary for policymakers. In: Solomon S, Qin D, Manning M et al (eds) Climate change 2007: The physical basis. Contribution of working group I to the fourth assessment report of the intergovernmental panel on climate change. Cambridge University Press, Cambridge, UK and New York, NY Google Scholar
- IPCC (2013) Summary for policymakers. In: Stocker TF, Qin D, Plattner G-K, Tignor M, Allen SK, Boschung J, Nauels A, Xia Y, Bex V, Midgley PM (eds) Climate Change 2013: the physical science basis. Contribution of Working Group I to the fifth assessment report of the intergovernmental panel on climate change, Cambridge University Press, Cambridge, UK and New York, NY, USAGoogle Scholar
- Madsen J, Cracknell G, Fox AD (1999) Goose populations of the Western Palearctic. A review of status and distribution. Wetlands International Publication No. 48. Wetlands International, Wageningen, The Netherlands. National Environmental Research Institute, Rønde, DenmarkGoogle Scholar
- Nei M (1987) Molecular evolutionary genetics. Columbia University Press, New YorkGoogle Scholar
- Nylander JAA (2004) MrModeltest v2. Program distributed by the author. Evolutionary Biology Centre, Uppsala University, 2Google Scholar
- Weir BS (1996) Genetic data analysis II: methods for discrete population genetic data. Sinauer Associates, Inc., SunderlandGoogle Scholar
- Xu L, Myneni RB, Chapin FS III, Callaghan TV, Pinzon JE, Tucker CJ, Zhu Z, Bi J, Ciais P, Tømmervik H, Euskirchen ES (2013) Temperature and vegetation seasonality diminishment over northern lands. Nat Clim Change 3:581–586Google Scholar