Species Density of North American Recent Mammals

Simpson, George Gaylord

doi:10.2307/2411825

Cited by 436 publications

(273 citation statements)

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“…The diversity index values thus fall within the range reported for temperate forests (Braun, 1950;Monk, 1967;Risser & Rice, 1971) but are markedly lower than those reported for tropical forests (Knight, 1975). The lower diversity in temperate vegetation could be due to lower rate of evolution and diversification of communities (Fischer, 1960;Simpson, 1964) and severity in the environment (Connell & Orias, 1964).…”

Section: Species Diversitysupporting

confidence: 68%

A phytosociological analysis of woody species in forest communities of a part of Kumaun Himalaya

1982

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This paper reports on a detailed phytosociological analysis of forests in the NW catchment of the Gola River in Kumaun Himalaya,' E. Fourteen sites and 56 stands at elevations ranging from 1 200 to 2 523 m and covering the following five forest types were investigated: Pinus roxburghii, mixed, Quercus leucotrichophora, Q. lanuginosa, and Q. floribunda. The basal cover of the forests differed according to slope position and aspect. The three oak forests had more basal cover than the other two, and Q. lanuginosa had the most. The performance of individual tree and shrub species and the number of saplings and seedlings differed according to slope position and aspect. The mixed forest had the greatest tree diversity, and among the others diversity increased with increasing basal cover. The diversity of trees, saplings, and herb layer was greatest on aspects with intermediate temperature and moisture conditions; whereas that of shrubs and seedlings increased towards the cooler (and wetter) and warmer (and drier) exposures. There was a positive relation between the diversity of shrubs plus seedlings and trees plus saplings in P. roxburghii and mixed forests; whereas this relationship was inverse in the three oak forests. In general, the dominance-diversity curves for the tree layer followed a geometric series conforming to the niche pre-emption situation in communities of low diversity. Among the forests, the regeneration was best in Q. lanuginosa and worst in Q. leucotrichophora.

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Section: Species Diversitysupporting

confidence: 68%

A phytosociological analysis of woody species in forest communities of a part of Kumaun Himalaya

1982

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“…The overestimation of species richness in the Florida peninsula (figure 3c) may also reflect the effects of other factors. The low species richness of different taxa in the Florida peninsula has been observed for several decades, which may be caused by the peninsula effects [47]. Moreover, in the future, testing the model performance in the South Hemisphere will be helpful.…”

Section: Discussion (A)mentioning

confidence: 99%

Patterns, determinants and models of woody plant diversity in China

et al. 2010

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What determines large-scale patterns of species richness remains one of the most controversial issues in ecology. Using the distribution maps of 11 405 woody species in China, we compared the effects of habitat heterogeneity, human activities and different aspects of climate, particularly environmental energy, waterenergy dynamics and winter frost, and explored how biogeographic affinities (tropical versus temperate) influence richness-climate relationships. We found that the species richness of trees, shrubs, lianas and all woody plants strongly correlated with each other, and more strongly correlated with the species richness of tropical affinity than with that of temperate affinity. The mean temperature of the coldest quarter was the strongest predictor of species richness, and its explanatory power for species richness was significantly higher for tropical affinity than for temperate affinity. These results suggest that the patterns of woody species richness mainly result from the increasing intensity of frost filtering for tropical species from the equator/lowlands towards the poles/highlands, and hence support the freezing-tolerance hypothesis. A model based on these results was developed, which explained 76-85% of species richness variation in China, and reasonably predicted the species richness of woody plants in North America and the Northern Hemisphere.

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“…Core forest species do not survive in isolated hedgerows; they need a forest. For peninsula species, hedgerows serve as forest peninsulas, their abun- (Milne and Forman 1986) and with mammals on continental peninsulas (Simpson 1964). One may expect that, according to their low speed of locomotion (Rivard 1965;Rijnsdorp 1980) corridor forest species, which do not fly, use hedgerows as suitable habitats and not only disperse along them but may reproduce in them.…”

Section: Discussionmentioning

confidence: 99%

Landscape structure effects on carabid beetles spatial patterns in western France

Burel

1989

Landscape Ecol

133

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Analysis of carabids spatial distribution in a hedgerow network landscape in western France, pinpoints the role of the landscape among other levels of ecological organization.Dispersion of forest species differs among core forest species, peninsula forest species and corridor forest species. Abundance of forest carabid species in a particular hedgerow is related to the positive effect of a dense herbaceous layer and the presence of a tree layer which is enhanced by the presence of two parallel hedgerows, especially along lanes.At the landscape level distance from the largest forest determines abundance of forest species within the first kilometer out of it. Beyond that, abundance is independent of distance from the source forest and the discriminant ecological factors are: hedgerow structure, presence of lanes bordered by two hedgerows.

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Species Density of North American Recent Mammals

Cited by 436 publications

References 0 publications

A phytosociological analysis of woody species in forest communities of a part of Kumaun Himalaya

A phytosociological analysis of woody species in forest communities of a part of Kumaun Himalaya

Patterns, determinants and models of woody plant diversity in China

Landscape structure effects on carabid beetles spatial patterns in western France

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