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Abundance-area relationships in bird assemblages along an Afrotropical elevational gradient: space limitation in montane forest selects for higher population densities
M. Ferenc, J. Fjeldså, O. Sedláček, FN. Motombi, E. Djomo Nana, K. Mudrová, D. Hořák,
Jazyk angličtina Země Německo
Typ dokumentu časopisecké články, práce podpořená grantem
NLK
ProQuest Central
od 2003-01-01 do Před 1 rokem
Medline Complete (EBSCOhost)
od 2000-01-01 do Před 1 rokem
Health & Medicine (ProQuest)
od 2003-01-01 do Před 1 rokem
- MeSH
- biodiverzita * MeSH
- extinkce biologická MeSH
- hustota populace MeSH
- lesy MeSH
- nadmořská výška MeSH
- Passeriformes fyziologie MeSH
- rozšíření zvířat * MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Geografické názvy
- Kamerun MeSH
The usual positive inter-specific relationship between range size and abundance of local populations can have notable exceptions in Afrotropical montane areas, where range-restricted bird species are unusually abundant. We tested how the area occupied locally by passerines and their geographic range size relate to local abundances along a tropical elevational gradient of Mt Cameroon, West-Central Africa. Data on bird assemblages were collected at six forested elevations (350, 650, 1100, 1500, 1850 m, 2200 m a.s.l.) using a standardised point count at 16 locations per elevation. Elevational ranges of birds were compiled from published sources and their geographic range sizes were determined as the occupancy of 1° x 1° grid cells. The observed relationship between local abundance and geographic range size within the entire passerine assemblage on Mt Cameroon disagrees with the most frequently reported positive pattern. However, the patterns differ among elevations, with positive trends of the abundance-range size relationship in lowland changing to negative trends towards higher elevations. Interestingly, the total assemblage abundances do not differ much among elevations and population size estimates of species occupying different parts of the gradient remain relatively constant. These patterns are caused by relatively high abundances of montane species, which might be a result of long-term ecological specialization and/or competitive release in species-poor montane locations and possibly facilitated by an extinction filter. Our data suggest that montane species' abilities to maintain dense populations might compensate for less area available near mountain tops and help these populations to circumvent extinction.
Citace poskytuje Crossref.org
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- $a Ferenc, Michal $u Department of Ecology, Faculty of Science, Charles University in Prague, Viničná 7, 12844, Praha 2, Czech Republic.
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- $a Abundance-area relationships in bird assemblages along an Afrotropical elevational gradient: space limitation in montane forest selects for higher population densities / $c M. Ferenc, J. Fjeldså, O. Sedláček, FN. Motombi, E. Djomo Nana, K. Mudrová, D. Hořák,
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- $a The usual positive inter-specific relationship between range size and abundance of local populations can have notable exceptions in Afrotropical montane areas, where range-restricted bird species are unusually abundant. We tested how the area occupied locally by passerines and their geographic range size relate to local abundances along a tropical elevational gradient of Mt Cameroon, West-Central Africa. Data on bird assemblages were collected at six forested elevations (350, 650, 1100, 1500, 1850 m, 2200 m a.s.l.) using a standardised point count at 16 locations per elevation. Elevational ranges of birds were compiled from published sources and their geographic range sizes were determined as the occupancy of 1° x 1° grid cells. The observed relationship between local abundance and geographic range size within the entire passerine assemblage on Mt Cameroon disagrees with the most frequently reported positive pattern. However, the patterns differ among elevations, with positive trends of the abundance-range size relationship in lowland changing to negative trends towards higher elevations. Interestingly, the total assemblage abundances do not differ much among elevations and population size estimates of species occupying different parts of the gradient remain relatively constant. These patterns are caused by relatively high abundances of montane species, which might be a result of long-term ecological specialization and/or competitive release in species-poor montane locations and possibly facilitated by an extinction filter. Our data suggest that montane species' abilities to maintain dense populations might compensate for less area available near mountain tops and help these populations to circumvent extinction.
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- $a Fjeldså, Jon $u Center for Macroecology, Evolution, and Climate, Natural History Museum of Denmark, University of Copenhagen, 2100, Copenhagen, Denmark.
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- $a Djomo Nana, Eric $u Department of Ecology, Faculty of Science, Charles University in Prague, Viničná 7, 12844, Praha 2, Czech Republic. IRTC-International Research and Training Center, Yaoundé, Cameroon.
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- $a Hořák, David $u Department of Ecology, Faculty of Science, Charles University in Prague, Viničná 7, 12844, Praha 2, Czech Republic. david.horak@natur.cuni.cz.
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