Measurement of "Overlap" in Comparative Ecological Studies

Horn, Henry S.

doi:10.1086/282436

Cited by 1,393 publications

(863 citation statements)

References 9 publications

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“…DCA was carried out using the PC-ORD 4.0 program (MCCUNE & MEFFORD 1999). The logarithmized matrix was also used to calculate a similarity matrix among the samples (Q mode), using the Morisita-Horn Index (HORN 1966, KREBS 1999. Visualization of that matrix was obtained through an agglomerative cluster analysis (ROMESBURG 1984).…”

Section: Discussionmentioning

confidence: 99%

Ephemeroptera, Plecoptera and Trichoptera assemblages in litter in a mountain stream of the Atlantic Rainforest from Southeastern Brazil

2007

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The study of Ephemeroptera, Plecoptera and Trichoptera associated with litter in southeastern Brazil streams aimed to answer the following questions: 1) Does richness and composition of EPT fauna differ between riffle and pool mesohabitats despite being associated to the same substratum, litter? 2) Does the similarity of the EPT fauna between both mesohabitats change with time? 3) Does the EPT functional feeding structure differ between both mesohabitats (riffles-pools)? In order to answer these questions, monthly collections, from November 1999 to June 2000, were done in Ribeirão (Stream) Bocaina with a D-net (10 litter patches in riffles and 10 in pools). The EPT fauna at Ribeirão Bocaina was more diversified and more abundant in the litter in riffles than in the litter in pools, although, when richness was standardized for the same number of individuals it became similar in both conditions. EPT fauna was very different between both mesohabitats in terms of faunal composition as well as in terms of function. Probably it was due to differences in water speed, in the time of litter residence and in the concentration of dissolved oxygen between both mesohabitats.

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Section: Discussionmentioning

confidence: 99%

Ephemeroptera, Plecoptera and Trichoptera assemblages in litter in a mountain stream of the Atlantic Rainforest from Southeastern Brazil

2007

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“…These values are arranged in similarity matrices that describe the position of each plot relative to all others in a multidimensional "hyperspace" whose axes are the relative abundances of all bird species or plant taxa censused, or all structural attributes measured. The similarity index used for the grassland flora and avifauna is R o Horn's (1966) index of overlap, which ranges from 0 (no shared species) to 1 (identical relative abundances). Because the structural variables cannot be represented by relative abundances, Ro is inappropriate to express plot relationships in this "space."…”

Section: Discussionmentioning

confidence: 99%

The role of habitat in avian community composition: physiognomy or floristics?

1985

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“…O grau de sobreposição alimentar foi calculado pela fórmula de Morisita modificada (HORN, 1966), utilizando os valores percentuais da freqüência de ocorrência de cada item do conteúdo estomacal e, à matriz de similaridade, foi aplicada a análise de agrupamento UPGMA (LEGENDRE & LEGENDRE, 1983).…”

Section: Methodsunclassified

Ocupação espacial, alimentação e época reprodutiva de duas espécies de Corydoras Lacépède (Siluroidei, Callichthyidae) coexistentes no rio Alambari (Botucatu, São Paulo)

Aranha

Caramaschi

1993

Rev. Bras. Zool.

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ABSfRACf. SPATIAL OCCUPATlON, FEEDlNG AND REPRODUCfIVE PERIOD OF NO SPECIES OF CORYDORAS LACÉPEDE (SILUROIDEI, CALLICHTHYIDAE) COEXISTENTS lN THE ALAMBARI RIVER (BOTUCATU, SÃO PAULO). Patterns of spatial occupation, feeding, and reproductive period of two species, Corydoras aeneus and Corydo ras gr. earlae (Siluroidei, Callichthyidae), coexistents in the Alambari River (Botucatu, São Paulo), were studied. High diet overlap, partial spatial segregation, and well differentiated reproductive strategies were verified. These findings do not permit to evidence the occurrence of competitive interactions between the analysed species. KEY WORDS. Siluroidei, Callichthyidae, spatial occupation, feeding; reproductive period o estudo da partilha de recursos entre espécies de uma comunidade pode fornecer dados importantes para o conhecimento da natureza das relações interespecíficas entre espécies coexistentes (SCHOENER, 1974).Durante estudo sobre a distribuição longitudinal de peixes em riachos da região de Botucatu (São Paulo), CARAMASCHI (1986) registrou Corydoras gr. carlae como espécie constante no trecho médio e Corydoras aeneus como constante nos trechos médio e inferior de alguns cursos d'água. Foi constatada, portanto, coexistência das duas espécies no trecho médio desses rios, o que motivou o estudo da partilha de recursos entre elas.Assim sendo, neste trabalho são apresentados os resultados da análise da segregação espacial e alimentar, bem como aspectos da reprodução, de Corydoras gr. car/ae e C. aeneus coexistentes em um riacho daquela região.

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Measurement of "Overlap" in Comparative Ecological Studies

Cited by 1,393 publications

References 9 publications

Ephemeroptera, Plecoptera and Trichoptera assemblages in litter in a mountain stream of the Atlantic Rainforest from Southeastern Brazil

Ephemeroptera, Plecoptera and Trichoptera assemblages in litter in a mountain stream of the Atlantic Rainforest from Southeastern Brazil

The role of habitat in avian community composition: physiognomy or floristics?

Ocupação espacial, alimentação e época reprodutiva de duas espécies de Corydoras Lacépède (Siluroidei, Callichthyidae) coexistentes no rio Alambari (Botucatu, São Paulo)

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