WildGagnonBouchard2006

Référence

Wild, M., Gagnon, D., Bouchard, A. (2006) Why are ferns regularly over-represented on state and provincial rare plant lists? Diversity and Distributions, 12(6):749-755.

Résumé

Several recent studies have suggested that rare species are not randomly distributed throughout plant taxa. This would appear to apply to North American ferns, which are frequently over-represented on local lists of rare plant species. However, such lists often paint a skewed portrait of the true situation because of our tendency to recognize the rarity of well-known and charismatic species while ignoring that of lesser-known or less-appreciated species. In order to verify if this over-representation of ferns is a real and consistent trend throughout local floras in North America, we used data from what we consider to be the most complete and objective available database: NatureServe Explorer (http://www.natureserve.org/explorer/). We compiled data on total vascular plant species, total fern species, as well as rare vascular plant species and rare fern species for each North American subnational (Canadian province or US state) flora. Rare species were defined as those belonging to one of NatureServe's 'at risk' categories. The null hypothesis that the contribution of rare ferns to total rare species did not differ from their contribution to the total vascular flora was assessed using ?2. Out of 64 subnational floras, we obtained significantly higher values than expected in 28 cases, and significantly lower in only one case. Similar trends hold true for individual fern families. These tendencies could be related to several factors of anthropogenic, biological, climatological, evolutionary, and geographical origin. However, we believe that the main reason is related to scale, namely the geopolitical units at which rarity is often studied. Our results illustrate one of the problems of a parochial approach to conservation, where the perceived rarity of an entire taxon is exaggerated because of the scale at which rarity is addressed. © 2006 The Authors.

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@ARTICLE { WildGagnonBouchard2006,
    AUTHOR = { Wild, M. and Gagnon, D. and Bouchard, A. },
    TITLE = { Why are ferns regularly over-represented on state and provincial rare plant lists? },
    JOURNAL = { Diversity and Distributions },
    YEAR = { 2006 },
    VOLUME = { 12 },
    PAGES = { 749-755 },
    NUMBER = { 6 },
    NOTE = { 13669516 (ISSN) Export Date: 25 April 2007 Source: Scopus CODEN: DIDIF doi: 10.1111/j.1472-4642.2006.00287.x Language of Original Document: English Correspondence Address: Wild, M.; Groupe de Recherche en E?cologie Forestie?re Interuniversitaire; Universite? du Que?bec a? Montre?al; Succ. Centre Ville Montreal, Que. H3C 3P8, Canada; email: wild.matthew@uqam.ca References: Allen, D.E., (1969) The Victorian Fern Craze: A History of Pteridomania, , Hutchinson, London; Andelman, S.J., Groves, C., Regan, H.M., A review of protocols for selecting species at risk in the context of US Forest Service viability assessments (2004) Acta Oecologica, 26, pp. 75-83; Argus, G.W., Pryer, K.M., (1990) Rare Vascular Plants in Canada - Our Natural Heritage, , Canadian Museum of Nature, Ottawa; Bouchard, A., Barabe?, D., Dumais, M., Hay, S., (1983) Les Plantes Vasculaires Rares du Que?bec, , Syllogeus no. 48, Canadian Museum of Nature, Ottawa; Bouchard, A., Barabe?, D., Hay, S., An isolated colony of Oreopteris limbosperma (All.) Holub in Gros Morne National Park, Newfoundland, Canada (1977) Naturaliste Canadien, 104, pp. 239-244; Bouchard, A., Hay, S., Thelypteris limbosperma in eastern North America (1976) Rhodora, 78, pp. 552-553; Brunton, D.F., Status of the southern maidenhair fern, Adiantum capillus-veneris (Adiantaceae), in Canada (1986) Canadian Field-Naturalist, 100, pp. 404-408; Burgman, M.A., Are listed threatened species really at risk? 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(2005) Ecography, 28, pp. 191-196; Young, S.M., Weldy, T.W., (2003) New York Rare Plant Status List, , New York Natural Heritage Program, Albany, NY. },
    ABSTRACT = { Several recent studies have suggested that rare species are not randomly distributed throughout plant taxa. This would appear to apply to North American ferns, which are frequently over-represented on local lists of rare plant species. However, such lists often paint a skewed portrait of the true situation because of our tendency to recognize the rarity of well-known and charismatic species while ignoring that of lesser-known or less-appreciated species. In order to verify if this over-representation of ferns is a real and consistent trend throughout local floras in North America, we used data from what we consider to be the most complete and objective available database: NatureServe Explorer (http://www.natureserve.org/explorer/). We compiled data on total vascular plant species, total fern species, as well as rare vascular plant species and rare fern species for each North American subnational (Canadian province or US state) flora. Rare species were defined as those belonging to one of NatureServe's 'at risk' categories. The null hypothesis that the contribution of rare ferns to total rare species did not differ from their contribution to the total vascular flora was assessed using ?2. Out of 64 subnational floras, we obtained significantly higher values than expected in 28 cases, and significantly lower in only one case. Similar trends hold true for individual fern families. These tendencies could be related to several factors of anthropogenic, biological, climatological, evolutionary, and geographical origin. However, we believe that the main reason is related to scale, namely the geopolitical units at which rarity is often studied. Our results illustrate one of the problems of a parochial approach to conservation, where the perceived rarity of an entire taxon is exaggerated because of the scale at which rarity is addressed. © 2006 The Authors. },
    KEYWORDS = { Aspleniaceae Dryopteridaceae Ferns Monilophytes NatureServe Ophioglossaceae Pteridaceae Rarity },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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