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Changes in lichen diversity and community structure with fur seal population increase on Signy Island, South Orkney Islands

Published online by Cambridge University Press:  24 September 2010

Sergio E. Favero-Longo*
Affiliation:
Dipartimento di Biologia Vegetale, Università degli Studi di Torino, Viale Mattioli 25, 10125 Torino, Italy
Nicoletta Cannone
Affiliation:
Dipartimento di Scienze Chimiche ed Ambientali, Università degli Studi dell’Insubria, Via Lucini 3, 22100 Como, Italy
M. Roger Worland
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
Peter Convey
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
Rosanna Piervittori
Affiliation:
Dipartimento di Biologia Vegetale, Università degli Studi di Torino, Viale Mattioli 25, 10125 Torino, Italy
Mauro Guglielmin
Affiliation:
Dipartimento di Biologia Strutturale e Funzionale, Università dell’Insubria, Via Dunant 3, 21100 Varese, Italy

Abstract

Signy Island has experienced a dramatic increase in fur seal numbers over recent decades, which has led to the devastation of lowland terrestrial vegetation, with the eradication of moss turfs and carpets being the most prominent feature. Here we demonstrate that fur seals also affect the other major component of this region’s typical cryptogamic vegetation, the lichens, although with a lower decrease in variability and abundance than for bryophytes. Classification (UPGMA) and ordination (Principal Coordinate Analysis) of vegetation data highlight differences in composition and abundance of lichen communities between areas invaded by fur seals and contiguous areas protected from these animals. Multivariate analysis relating lichen communities to environmental parameters, including animal abundance and soil chemistry (Canonical Correspondence Analysis), suggests that fur seal trampling results in the destruction of muscicolous-terricolous lichens, including several cosmopolitan and bipolar fruticose species. In addition, animal excretion favours an increase in nitrophilous crustose species, a group which typically characterizes areas influenced by seabirds and includes several Antarctic endemics. The potential effect of such animal-driven changes in vegetation on the fragile terrestrial ecosystem (e.g. through modification of the ground surface temperature) confirms the importance of indirect environmental processes in Antarctica.

Type
Biological Sciences
Copyright
Copyright © Antarctic Science Ltd 2011

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References

AOAC (Association of Official Analytical Chemists). 1997. Official Methods of Analysis of AOAC International, 16th ed. Washington, DC: AOAC International, 509 pp.Google Scholar
Barnes, D.K.A., Kaiser, S., Griffiths, H.J. Linse, K. 2009. Marine, intertidal, freshwater and terrestrial biodiversity of an isolated polar archipelago. Journal of Biogeography, 36, 756769.Google Scholar
Bokhorst, S., Huiskes, A., Convey, P. Aerts, R. 2007. External nutrient inputs to terrestrial ecosystems on the Falkland Islands and the maritime Antarctic region. Polar Biology, 30, 13151321.CrossRefGoogle Scholar
Bültmann, H. Daniëls, F.J.A. 2001. Lichen richness-biomass relationship in terricolous lichen vegetation on non-calcareous substrates. Phytocoenologia, 31, 537570.Google Scholar
Butler, H.G. 1999. Seasonal dynamics of the planktonic microbial community in a maritime Antarctic lake undergoing eutrophication. Journal of Plankton Research, 21, 23932419.CrossRefGoogle Scholar
Cannone, N., Ellis-Evans, J.C., Strachan, R. Guglielmin, M. 2006. Interactions between climate, vegetation and active layer in maritime Antarctica. Antarctic Science, 18, 323333.Google Scholar
Convey, P. 2006. Antarctic climate change and its influences on terrestrial ecosystems. In Bergstrom, D.M., Convey, P. & Huiskes, A.H.L., eds. Trends in Antarctic terrestrial and limnetic ecosystems: Antarctica as a global indicator. Dordrecht: Springer, 253272.Google Scholar
Convey, P., Bindschadler, R.A., di Prisco, G., Fahrbach, E., Gutt, J., Hodgson, D.A., Mayewski, P., Summerhayes, C.P. Turner, J. 2009. Antarctic climate change and the environment. Antarctic Science, 21, 541563.Google Scholar
den Herder, M., Kytöviita, M.M. Niemelä, P. 2003. Growth of reindeer lichens and effects of reindeer grazing on ground cover vegetation of a Scots pine forest and a subarctic heatland in Finnish Lapland. Ecography, 26, 312.Google Scholar
Fremstad, E., Paal, J. Möls, T. 2005. Impacts of increased nitrogen supply in Norwegian lichen-rich alpine communities: a 10-year experiment. Journal of Ecology, 93, 471481.Google Scholar
Frenot, Y., Chown, S.L., Whinam, J., Selkirk, P.M., Convey, P., Skotnicki, M. Bergstron, D.M. 2005. Biological invasions in the Antarctic: impacts and implications. Biological Reviews, 80, 4572.CrossRefGoogle ScholarPubMed
Gimingham, C.H. Smith, R.I.L. 1970. Bryophyte and lichen communities in the maritime Antarctic. In Holdgate, M.W., ed. Antarctic ecology, vol. 1. London: Academic Press, 752785.Google Scholar
Guglielmin, M., Ellis-Evans, C.J. Cannone, N. 2008. Active layer thermal regime under different vegetation conditions in permafrost areas: a case study at Signy Island (maritime Antarctica). Geoderma, 144, 7385.Google Scholar
Harrison, S., Ross, S.J. Lawton, J.H. 1992. Beta diversity on geographic gradient in Britain. Journal of Animal Ecology, 61, 151158.Google Scholar
Hodgson, D.A., Johnston, N.M., Caulkett, P. Jones, V.J. 1998. Paleolimnology of Antarctic fur seal Arctocephalus gazella populations and implications for Antarctic management. Biological Conservation, 83, 145154.Google Scholar
Körner, C. 2003. Alpine plant life, 2nd ed. Berlin: Springer Verlag, 349 pp.CrossRefGoogle Scholar
Lamb, I.M. 1970. Antarctic terrestrial plants and their ecology. In Holdgate, M.W., ed. Antarctic ecology, vol. 2. London: Academic Press, 733751.Google Scholar
Leishman, M.R. Wild, C. 2001. Vegetation abundance and diversity in relation to soil nutrients and soil water content in Vestfold Hills, East Antarctica. Antarctic Science, 13, 126134.Google Scholar
Nilsson, M.C., Wardle, D.A., Zackrisson, O. Jäderlund, A. 2002. Effects of alleviation of ecological stresses on an alpine tundra community over an eight year period. Oikos, 97, 317.Google Scholar
Øvstedal, D.O. Smith, R.I.L. 2001. Lichens of Antarctica and South Georgia: a guide to their identification and ecology. Cambridge: Cambridge University Press, 411 pp.Google Scholar
Øvstedal, D.O. Smith, R.I.L. 2004. Additions and corrections to the lichens of Antarctica and South Georgia. Cryptogamie, Mycologie, 24, 323331.Google Scholar
Pietola, L., Horn, R. Yli-Halla, M. 2005. Effects of trampling by cattle on the hydraulic and mechanical properties of soil. Soil & Tillage Research, 82, 99108.CrossRefGoogle Scholar
Podani, J. 2001. SYN-TAX 2000. Computer programs for data analysis in ecology and systematics. User’s manual. Budapest: Scientia Publishing, 53 pp.Google Scholar
Quayle, W.C. Convey, P. 2006. Concentration, molecular weight distribution and carbohydrate composition of DOC in maritime Antarctic lakes of differing trophic status. Aquatic Geochemistry, 12, 161178.CrossRefGoogle Scholar
Roberts, P., Newsham, K.K., Bardgett, R.D., Farrar, J.F. Jones, D.L. 2009. Vegetation cover regulates the quantity, quality and temporal dynamics of dissolved organic carbon and nitrogen in Antarctic soils. Polar Biology, 32, 9991008.Google Scholar
Saarijärvi, K. Virkajärvi, P. 2009. Nitrogen dynamics of cattle dung and urine patches on intensively managed boreal pasture. Journal of Agricultural Science, 147, 479491.CrossRefGoogle Scholar
Sancho, L.G. Pintado, A. 2004. Evidence of high annual growth rate for lichens in the maritime Antarctic. Polar Biology, 27, 312319.Google Scholar
Smith, R.I.L. 1972. Vegetation of the South Orkney Islands with particular reference to Signy Island. British Antarctic Survey Scientific Reports, 68, 1124.Google Scholar
Smith, R.I.L. 1984. Terrestrial plant biology of the sub-Antarctic and Antarctic. In Laws, R.M., ed. Antarctic ecology. London: Academic Press, 61162.Google Scholar
Smith, R.I.L. 1988. Destruction of Antarctic terrestrial ecosystems by a rapidly increasing fur seal population. Biological Conservation, 45, 5572.Google Scholar
Smith, R.I.L. 1990. Signy Island as a paradigm of biological and environmental change in Antarctic terrestrial ecosystems. In Kerry, K.R. & Hempel, G., eds. Antarctic ecosystems: ecological change and conservation. Berlin: Springer, 3250.Google Scholar
Smith, R.I.L. 1997. Impact of an increasing fur seal population on Antarctic plant communities; resilience and recovery. In Battaglia, B., Valancia, J. & Walton, D.W.H., eds. Antarctic communities: species, structure and survival. Cambridge: Cambridge University Press, 432436.Google Scholar
Smith, R.I.L. 2007. Half a continent in a square kilometre: the exceptional lichen diversity of a small Antarctic island. Bibliotheca Lichenologica, 95, 387403.Google Scholar
Smykla, J., Wolek, J. Barcikowski, A. 2007. Zonation of vegetation related to penguin rookeries on King George Island, maritime Antarctic. Arctic, Antarctic and Alpine Research, 39, 143151.Google Scholar
Søchting, U., Øvstedal, D.O. Sancho, L.G. 2004. The lichens of Hurd Peninsula, South Shetlands, Antarctica. Bibliotheca Lichenologica, 88, 607658.Google Scholar
Ter Braak, C.J.F. Šmilauer, P. 2002. CANOCO reference manual and CanoDraw for Windows user’s guide: software for canonical community ordination (ver. 4.5). Ithaca, NY: Microcomputer Power, 500 pp.Google Scholar
Ter Braak, C.J.F. Verdonschot, P.F.M. 1995. Canonical correspondence analysis and related multivariate methods in aquatic ecology. Aquatic Sciences, 57, 255264.CrossRefGoogle Scholar
Theobald, M.R., Crittenden, P.D., Hunt, A.P., Tang, Y.S., Dragosits, U. Sutton, M.A. 2006. Ammonia emissions from a cape fur seal colony, Cape Cross, Namibia. Geophysical Research Letters, 33, 10.1029/2005GL024384.CrossRefGoogle Scholar
Tin, T., Fleming, Z., Hughes, K.A., Ainley, D., Convey, P., Moreno, C., Pfeiffer, S., Scott, J. Snape, I. 2009. Impacts of local human activities on the Antarctic environment: a review. Antarctic Science, 21, 333.Google Scholar
Turner, J., Colwell, S.R., Marshall, G.J., Lachlan-Cope, T.A., Carleton, A.M., Jones, P.D., Lagun, V., Reid, P.A. Iagovkina, S. 2005. Antarctic climate change during the last 50 years. International Journal of Climatology, 25, 279294.Google Scholar
Wall, D.H. 2005. Biodiversity and ecosystem functioning in terrestrial habitats of Antarctica. Antarctic Science, 17, 523531.CrossRefGoogle Scholar
Waluda, C.M., Gregory, S. Dunn, M.J. 2010. Long-term variability in the abundance of Antarctic fur seals Arctocephalus gazella at Signy Island, South Orkneys. Polar Biology, 33, 305312.Google Scholar
Wasley, J., Robinson, S.A., Lovelock, C.E. Popp, M. 2006. Climate change manipulations show Antarctic flora is more strongly affected by elevated nutrients than water. Global Change Biology, 12, 18001812.Google Scholar
Whittaker, R.H. 1972. Evolution and measurements of species diversity. Taxon, 21, 213251.Google Scholar
Will-Wolf, S., Scheidegger, C. McCune, B. 2002. Methods for monitoring biodiversity and ecosystem function. In Nimis, P.L., Scheidegger, C. & Wolseley, P.A., eds. Monitoring with lichens - Monitoring lichens. Series IV: Earth and Environmental Sciences 7. Dordrecht: Kluwer Academic Publishers, 147162.Google Scholar
Will-Wolf, S., Hawksworth, D.L., Mc Cune, B., Rosentreter, R. Sipman, H.J.M. 2004. Lichenized fungi. In Mueller, G.M., Bills, G.F. & Foster M.S., eds. Biodiversity of fungi: inventory and monitory methods. New York: Academic Press, 173195.Google Scholar
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