Sampling effort and fish species richness in small terra firme forest streams of central Amazonia, Brazil
Small streams are important components of the landscape in terra firme forests in central Amazonia and harbor a large number of fish species. Nevertheless, the lack of a common sampling protocol in studies of this ichthyofauna hinders comparisons among available results. This study evaluates how the...
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Published in | Neotropical Ichthyology Vol. 5; no. 1; pp. 45 - 52 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Sociedade Brasileira de Ictiologia
01.03.2007
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Abstract | Small streams are important components of the landscape in terra firme forests in central Amazonia and harbor a large number of fish species. Nevertheless, the lack of a common sampling protocol in studies of this ichthyofauna hinders comparisons among available results. This study evaluates how the length of stream reach sampled affects estimates of local fish species density in 1st, 2nd, and 3rd order streams, and proposes a mean minimum sampling length that best approximates the absolute number of species in a given stream segment. We sampled three streams in the Biological Dynamics of Forest Fragments Project's study sites, between May and August 2004. At each stream, one 1st order, one 2nd order, and one 3rd order segment was sampled. We sampled five 20-m reaches in each stream segment. Three to four people collected along each reach for 45 to 60 minutes. We used Jaccard's coefficient to estimate the similarity of species composition among stream reaches and segments. Estimates of species richness were obtained with Jackknife 1 and Bootstrap algorithms and species accumulation curves. We used simple linear regressions to look for relationships between species density and fish abundance and between species density and the volume of 100-m stream segments. Species density in 1st order stream reaches was slightly higher than in 2nd and 3rd order stream reaches, whereas fish abundance was apparently higher in 3rd order reaches. Similarity in fish species composition between 20-m reaches was low for all studied streams. Species density values in pooled 100-m stream segments represented 71.4% to 94.1% of the estimated values for these streams. Species density showed a direct relationship both with volume of the sampled stream segment and fish abundance. It seems plausible that larger streams contain a higher number of microhabitat types, which allow for the presence of more fish species per stream length. Based on the values of asymptotes and equations for species accumulation curves, the mean minimum sampling length that best estimates the absolute number of species in a stream segment is 180 m ± 20 sd for 1st order segments; 213 m ± 23 sd for 2nd order segments, and 253 m ± 30 sd for 3rd order stream segments.
Pequenos igarapés são componentes importantes da paisagem das florestas de terra firme da Amazônia Central e abrigam um grande número de espécies de peixes. Contudo, a falta de um protocolo de amostragem comum em estudos desta ictiofauna dificulta a comparação dos resultados obtidos. Este estudo avalia como o comprimento dos trechos amostrados afeta as estimativas de densidade local de espécies de peixes em riachos de 1ª, 2ª e 3ª ordens e propõe um comprimento mínimo médio de amostragem que melhor estima o número absoluto de espécies em um dado segmento de riacho. Nós amostramos três sistemas de riachos nas áreas de estudo do Projeto Dinâmica Biológica de Fragmentos Florestais, entre maio e agosto de 2004. Em cada riacho, foi amostrado um segmento de 1ªordem, um de 2ª ordem e um de 3ªordem. Amostramos cinco trechos de 20-m em cada segmento de riacho. Três a quatro pessoas coletaram ao longo de cada trecho durante 45 a 60 min. Usamos o coeficiente de Jaccard para estimar a similaridade da composição de espécies entre trechos e entre segmentos de riachos. Estimativas de riqueza de espécies foram obtidas com uso dos algoritmos de Jackknife 1 e Bootstrap e de curvas de acumulação de espécies. Usamos regressões lineares simples para verificar relações entre a densidade de espécies e a abundância de peixes e entre densidade de espécies e o volume de segmentos de 100-m de riacho. A densidade de espécies foi um pouco maior nos trechos de riacho de 1ª ordem do que nos de 2ª e 3ª ordens, contudo a abundância de peixes foi aparentemente maior nos trechos de 3ª ordem. A similaridade na composição de espécies de peixes entre trechos de 20-m foi baixa para todos os riachos estudados. Valores de densidade de espécies para segmentos de 100-m representaram de 71,4% a 94,1% dos valores estimados para esses riachos. A densidade de espécies mostrou uma relação direta tanto com o volume do segmento de riacho amostrado, como com a abundância de peixes. Parece plausível que riachos maiores contenham um número maior de tipos de microhábitats, que permitiriam a presença de mais espécies de peixes por trecho de riacho. Baseado nos valores das assíntotas e nas equações das curvas de acumulação de espécies, o comprimento mínimo médio de amostragem que melhor estima o número absoluto de espécies em um segmento de riacho é 180m ± 20 dp para segmentos de 1ª ordem; 213 m ± 23 dp para os segmentos de 2ª ordem e 253 m ± 30 dp para os segmentos de 3ª ordem. |
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AbstractList | Small streams are important components of the landscape in terra firme forests in central Amazonia and harbor a large number of fish species. Nevertheless, the lack of a common sampling protocol in studies of this ichthyofauna hinders comparisons among available results. This study evaluates how the length of stream reach sampled affects estimates of local fish species density in 1st, 2nd, and 3rd order streams, and proposes a mean minimum sampling length that best approximates the absolute number of species in a given stream segment. We sampled three streams in the Biological Dynamics of Forest Fragments Project's study sites, between May and August 2004. At each stream, one 1st order, one 2nd order, and one 3rd order segment was sampled. We sampled five 20-m reaches in each stream segment. Three to four people collected along each reach for 45 to 60 minutes. We used Jaccard's coefficient to estimate the similarity of species composition among stream reaches and segments. Estimates of species richness were obtained with Jackknife 1 and Bootstrap algorithms and species accumulation curves. We used simple linear regressions to look for relationships between species density and fish abundance and between species density and the volume of 100-m stream segments. Species density in 1st order stream reaches was slightly higher than in 2nd and 3rd order stream reaches, whereas fish abundance was apparently higher in 3rd order reaches. Similarity in fish species composition between 20-m reaches was low for all studied streams. Species density values in pooled 100-m stream segments represented 71.4% to 94.1% of the estimated values for these streams. Species density showed a direct relationship both with volume of the sampled stream segment and fish abundance. It seems plausible that larger streams contain a higher number of microhabitat types, which allow for the presence of more fish species per stream length. Based on the values of asymptotes and equations for species accumulation curves, the mean minimum sampling length that best estimates the absolute number of species in a stream segment is 180 m ± 20 sd for 1st order segments; 213 m ± 23 sd for 2nd order segments, and 253 m ± 30 sd for 3rd order stream segments. Small streams are important components of the landscape in terra firme forests in central Amazonia and harbor a large number of fish species. Nevertheless, the lack of a common sampling protocol in studies of this ichthyofauna hinders comparisons among available results. This study evaluates how the length of stream reach sampled affects estimates of local fish species density in 1st, 2nd, and 3rd order streams, and proposes a mean minimum sampling length that best approximates the absolute number of species in a given stream segment. We sampled three streams in the Biological Dynamics of Forest Fragments Project's study sites, between May and August 2004. At each stream, one 1st order, one 2nd order, and one 3rd order segment was sampled. We sampled five 20-m reaches in each stream segment. Three to four people collected along each reach for 45 to 60 minutes. We used Jaccard's coefficient to estimate the similarity of species composition among stream reaches and segments. Estimates of species richness were obtained with Jackknife 1 and Bootstrap algorithms and species accumulation curves. We used simple linear regressions to look for relationships between species density and fish abundance and between species density and the volume of 100-m stream segments. Species density in 1st order stream reaches was slightly higher than in 2nd and 3rd order stream reaches, whereas fish abundance was apparently higher in 3rd order reaches. Similarity in fish species composition between 20-m reaches was low for all studied streams. Species density values in pooled 100-m stream segments represented 71.4% to 94.1% of the estimated values for these streams. Species density showed a direct relationship both with volume of the sampled stream segment and fish abundance. It seems plausible that larger streams contain a higher number of microhabitat types, which allow for the presence of more fish species per stream length. Based on the values of asymptotes and equations for species accumulation curves, the mean minimum sampling length that best estimates the absolute number of species in a stream segment is 180 m ± 20 sd for 1st order segments; 213 m ± 23 sd for 2nd order segments, and 253 m ± 30 sd for 3rd order stream segments. Pequenos igarapés são componentes importantes da paisagem das florestas de terra firme da Amazônia Central e abrigam um grande número de espécies de peixes. Contudo, a falta de um protocolo de amostragem comum em estudos desta ictiofauna dificulta a comparação dos resultados obtidos. Este estudo avalia como o comprimento dos trechos amostrados afeta as estimativas de densidade local de espécies de peixes em riachos de 1ª, 2ª e 3ª ordens e propõe um comprimento mínimo médio de amostragem que melhor estima o número absoluto de espécies em um dado segmento de riacho. Nós amostramos três sistemas de riachos nas áreas de estudo do Projeto Dinâmica Biológica de Fragmentos Florestais, entre maio e agosto de 2004. Em cada riacho, foi amostrado um segmento de 1ªordem, um de 2ª ordem e um de 3ªordem. Amostramos cinco trechos de 20-m em cada segmento de riacho. Três a quatro pessoas coletaram ao longo de cada trecho durante 45 a 60 min. Usamos o coeficiente de Jaccard para estimar a similaridade da composição de espécies entre trechos e entre segmentos de riachos. Estimativas de riqueza de espécies foram obtidas com uso dos algoritmos de Jackknife 1 e Bootstrap e de curvas de acumulação de espécies. Usamos regressões lineares simples para verificar relações entre a densidade de espécies e a abundância de peixes e entre densidade de espécies e o volume de segmentos de 100-m de riacho. A densidade de espécies foi um pouco maior nos trechos de riacho de 1ª ordem do que nos de 2ª e 3ª ordens, contudo a abundância de peixes foi aparentemente maior nos trechos de 3ª ordem. A similaridade na composição de espécies de peixes entre trechos de 20-m foi baixa para todos os riachos estudados. Valores de densidade de espécies para segmentos de 100-m representaram de 71,4% a 94,1% dos valores estimados para esses riachos. A densidade de espécies mostrou uma relação direta tanto com o volume do segmento de riacho amostrado, como com a abundância de peixes. Parece plausível que riachos maiores contenham um número maior de tipos de microhábitats, que permitiriam a presença de mais espécies de peixes por trecho de riacho. Baseado nos valores das assíntotas e nas equações das curvas de acumulação de espécies, o comprimento mínimo médio de amostragem que melhor estima o número absoluto de espécies em um segmento de riacho é 180m ± 20 dp para segmentos de 1ª ordem; 213 m ± 23 dp para os segmentos de 2ª ordem e 253 m ± 30 dp para os segmentos de 3ª ordem. Small streams are important components of the landscape in terra firme forests in central Amazonia and harbor a large number of fish species. Nevertheless, the lack of a common sampling protocol in studies of this ichthyofauna hinders comparisons among available results. This study evaluates how the length of stream reach sampled affects estimates of local fish species density in 1 super(st), 2 super(nd), and 3 super(rd) order streams, and proposes a mean minimum sampling length that best approximates the absolute number of species in a given stream segment. We sampled three streams in the Biological Dynamics of Forest Fragments Project's study sites, between May and August 2004. At each stream, one 1 super(st )order, one 2 super(nd) order, and one 3 super(rd) order segment was sampled. We sampled five 20-m reaches in each stream segment. Three to four people collected along each reach for 45 to 60 minutes. We used Jaccard's coefficient to estimate the similarity of species composition among stream reaches and segments. Estimates of species richness were obtained with Jackknife 1 and Bootstrap algorithms and species accumulation curves. We used simple linear regressions to look for relationships between species density and fish abundance and between species density and the volume of 100-m stream segments. Species density in 1 super(st) order stream reaches was slightly higher than in 2 super(nd) and 3 super(rd) order stream reaches, whereas fish abundance was apparently higher in 3 super(rd) order reaches. Similarity in fish species composition between 20-m reaches was low for all studied streams. Species density values in pooled 100-m stream segments represented 71.4% to 94.1% of the estimated values for these streams. Species density showed a direct relationship both with volume of the sampled stream segment and fish abundance. It seems plausible that larger streams contain a higher number of microhabitat types, which allow for the presence of more fish species per stream length. Based on the values of asymptotes and equations for species accumulation curves, the mean minimum sampling length that best estimates the absolute number of species in a stream segment is 180 m +/- 20 sd for 1 super(st) order segments; 213 m +/- 23 sd for 2 super(nd) order segments, and 253 m +/- 30 sd for 3 super(rd) order stream segments. |
Author | Anjos, Maeda Batista dos Zuanon, Jansen |
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SubjectTerms | fish abundance fish diversity species accumulation curves species composition stream size |
Title | Sampling effort and fish species richness in small terra firme forest streams of central Amazonia, Brazil |
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