Demography of three dominant sedges under contrasting grazing regimes in the High Arctic
Abstract. Tiller demography of Carex aquatilis ssp. stans, Carex membranacea , and Eriophorum angustifolium ssp. triste was investigated in ungrazed and grazed high arctic vegetation on central Ellesmere Island, Canada. Tiller birth, growth, flowering and death were studied from excavated clonal fra...
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crwiley:10.2307/3236906 2023-12-03T10:17:32+01:00 Demography of three dominant sedges under contrasting grazing regimes in the High Arctic Tolvanen, Anne Schroderus, Jyrki Henry, Gregory H.R. 2001 http://dx.doi.org/10.2307/3236906 http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F3236906 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F3236906 https://onlinelibrary.wiley.com/doi/pdf/10.2307/3236906 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Vegetation Science volume 12, issue 5, page 659-670 ISSN 1100-9233 1654-1103 Plant Science Ecology journal-article 2001 crwiley https://doi.org/10.2307/3236906 2023-11-09T14:28:10Z Abstract. Tiller demography of Carex aquatilis ssp. stans, Carex membranacea , and Eriophorum angustifolium ssp. triste was investigated in ungrazed and grazed high arctic vegetation on central Ellesmere Island, Canada. Tiller birth, growth, flowering and death were studied from excavated clonal fragments, and tiller density and biomass were studied from excavated turfs. Five life‐cycle stages were determined: dormant buds, juvenile, mature, flowering and dead tillers. A stage‐based transition matrix model was developed to estimate the long‐term dynamics of the sedge populations and to compare life‐history strategies between ungrazed and grazed populations. Short‐term and retrospective models, based on the growth during the sampling year and during the lifetime of the clonal fragments, respectively, were compared to see how well the short‐term model can describe demography of long‐lived plants. According to the short‐term model, tiller populations were decreasing (λ < 1 except for C. membranacea ), whereas the retrospective model indicated that the tiller populations were increasing. Tiller population growth rates did not differ between ungrazed and grazed habitats. Nevertheless, the similar growth rates may be obtained by balanced differences in the vital rates between plants of the two habitats. The plants in the ungrazed habitat tended to remain in their current life‐cycle stage, whereas plants in the grazed habitat moved quickly to the next stage and died earlier. C. aquatilis ssp. stans appears to gain a competitive advantage over the other species under intensive grazing, as indicated by the higher tiller density and greater below‐ground biomass in grazed vegetation. The greater amount of below‐ground biomass apparently buffers C. aquatilis ssp. stans against grazing better than the other species. Article in Journal/Newspaper Arctic Carex aquatilis Ellesmere Island Eriophorum Wiley Online Library (via Crossref) Arctic Ellesmere Island Canada Journal of Vegetation Science 12 5 659 670 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Plant Science Ecology |
spellingShingle |
Plant Science Ecology Tolvanen, Anne Schroderus, Jyrki Henry, Gregory H.R. Demography of three dominant sedges under contrasting grazing regimes in the High Arctic |
topic_facet |
Plant Science Ecology |
description |
Abstract. Tiller demography of Carex aquatilis ssp. stans, Carex membranacea , and Eriophorum angustifolium ssp. triste was investigated in ungrazed and grazed high arctic vegetation on central Ellesmere Island, Canada. Tiller birth, growth, flowering and death were studied from excavated clonal fragments, and tiller density and biomass were studied from excavated turfs. Five life‐cycle stages were determined: dormant buds, juvenile, mature, flowering and dead tillers. A stage‐based transition matrix model was developed to estimate the long‐term dynamics of the sedge populations and to compare life‐history strategies between ungrazed and grazed populations. Short‐term and retrospective models, based on the growth during the sampling year and during the lifetime of the clonal fragments, respectively, were compared to see how well the short‐term model can describe demography of long‐lived plants. According to the short‐term model, tiller populations were decreasing (λ < 1 except for C. membranacea ), whereas the retrospective model indicated that the tiller populations were increasing. Tiller population growth rates did not differ between ungrazed and grazed habitats. Nevertheless, the similar growth rates may be obtained by balanced differences in the vital rates between plants of the two habitats. The plants in the ungrazed habitat tended to remain in their current life‐cycle stage, whereas plants in the grazed habitat moved quickly to the next stage and died earlier. C. aquatilis ssp. stans appears to gain a competitive advantage over the other species under intensive grazing, as indicated by the higher tiller density and greater below‐ground biomass in grazed vegetation. The greater amount of below‐ground biomass apparently buffers C. aquatilis ssp. stans against grazing better than the other species. |
format |
Article in Journal/Newspaper |
author |
Tolvanen, Anne Schroderus, Jyrki Henry, Gregory H.R. |
author_facet |
Tolvanen, Anne Schroderus, Jyrki Henry, Gregory H.R. |
author_sort |
Tolvanen, Anne |
title |
Demography of three dominant sedges under contrasting grazing regimes in the High Arctic |
title_short |
Demography of three dominant sedges under contrasting grazing regimes in the High Arctic |
title_full |
Demography of three dominant sedges under contrasting grazing regimes in the High Arctic |
title_fullStr |
Demography of three dominant sedges under contrasting grazing regimes in the High Arctic |
title_full_unstemmed |
Demography of three dominant sedges under contrasting grazing regimes in the High Arctic |
title_sort |
demography of three dominant sedges under contrasting grazing regimes in the high arctic |
publisher |
Wiley |
publishDate |
2001 |
url |
http://dx.doi.org/10.2307/3236906 http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F3236906 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F3236906 https://onlinelibrary.wiley.com/doi/pdf/10.2307/3236906 |
geographic |
Arctic Ellesmere Island Canada |
geographic_facet |
Arctic Ellesmere Island Canada |
genre |
Arctic Carex aquatilis Ellesmere Island Eriophorum |
genre_facet |
Arctic Carex aquatilis Ellesmere Island Eriophorum |
op_source |
Journal of Vegetation Science volume 12, issue 5, page 659-670 ISSN 1100-9233 1654-1103 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.2307/3236906 |
container_title |
Journal of Vegetation Science |
container_volume |
12 |
container_issue |
5 |
container_start_page |
659 |
op_container_end_page |
670 |
_version_ |
1784264480763412480 |