Diversity, biotic and similarity indices

Washington, Haydn

doi:10.1016/0043-1354(84)90164-7

Cited by 690 publications

(130 citation statements)

References 99 publications

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“…Net rates of population growth of the phytoplankton between sample dates at individual lakes were calculated using the equation (Reynolds 1997): (1) where r n is the net rate of growth (day-1 ) and N t and N 0 are cell densities at times t and 0, respectively. Phytoplankton counts were converted to relative abundances on the basis of organism density and then the index of diversity was calculated according to the method of Shannon & Weaver (Washington 1984):…”

Section: Collection Of Samples and Algal Enumerationmentioning

confidence: 99%

Recent occurrence ofCylindrospermopsis raciborskiiin Waikato lakes of New Zealand

Ryan¹,

Hamilton²,

Barnes³

2003

New Zealand Journal of Marine and Freshwater Research

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Cylindrospermopsis raciborskii is a toxin-producing species of cyanobacteria that in autumn 2003 was recorded for the first time in three shallow (max. depth 5 m) Waikato lakes and a hydro-electric dam on the Waikato River, New Zealand. It formed water blooms at densities >100 000 cells/ml in Lakes Waahi and Whangape. Net rates of population growth >0.2 day -1 were recorded for C. raciborskii in Lakes Ngaroto, Waahi, and Karapiro, based on comparisons of low numbers (detection of <10 cells/ml) from initial samples and its presence at bloom densities (>15 000 cells/ml) in the subsequent sample "x"-"y" days later. C. raciborskii may be well adapted to rapid proliferation in the Waikato lakes, which are eutrophic to hypertrophic, with high light attenuation, and where nitrogen (N) fixation may provide it with a competitive advantage over non-nitrogen fixing algae under N-limited conditions.

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Section: Collection Of Samples and Algal Enumerationmentioning

confidence: 99%

Recent occurrence ofCylindrospermopsis raciborskiiin Waikato lakes of New Zealand

Ryan¹,

Hamilton²,

Barnes³

2003

New Zealand Journal of Marine and Freshwater Research

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“…También podrían limitar el desove y cría, perjudicando la reproducción de muchas otras especies de peces. En este sentido, el grupo de los Cyprinodontiformes no se vería tan afectado, por ser especies vivíparas, lo que representa una ventaja importante con respecto a los demás grupos (BRANCO, 1984 Se sabe que la degradación ambiental provoca que comunidades diversas constituidas por muchas especies, cambien a comunidades simples dominadas por unas pocas, capaces de resistir las condiciones alteradas (EVERHART & YOUNGS, 1981;WASHINGTON, 1984;FAUSCH et al, 1990). Varios autores han utilizado el Índice de Diversidad como herramienta para distinguir áreas con diferente calidad ambiental (SMITH et al, 1997;LEMES & GARUTTI, 2002).…”

Section: Discussionunclassified

“…En cada sitio se determinó la riqueza de especies (entendida como el número de especies en cada lugar), el índice de diversidad de Shannon-Wiener y el índice de dominancia de Berger-Parker (WASHINGTON, 1984;MAGURRAN, 1988).…”

Section: Materiales Y Métodosunclassified

Composición y estructura de la ictiofauna del Río Ceballos-Saldán (Córdoba, Argentina)

Juncos

Bistoni

Freyer

2006

Iheringia, Sér. Zool.

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ABSTRACT. Composition and structure of the icthyofauna of the Ceballos-Saldán River (Córdoba, Argentina). Rivers show a longitudinal gradient from upstream to downstream, with consecutive changes in environmental characteristics and community composition. The main goal of this study was to describe the longitudinal variations in the characteristics of the fish fauna of CeballosSaldán River. Fish collection was performed at five sites along the river, before and after the main cities. Fish assemblages were described by specific composition, fish abundance, richness, diversity and dominance. These assemblage attributes were estimated for each sampling site. Species/abundance models were applied to each fish assemblage along the river. A total of 1,914 individuals were collected in Ceballos-Saldán River, which correspond to 17 species. Eleven of them were cited for the first time in the basin. The most abundant order was the Siluriformes. The most abundant species was Hypostomus cordovae (Günther, 1880). The only community attribute that significantly changed along Ceballos-Saldán River was total abundance, which presented its minimum value before Río Ceballos city. Three different species abundance models, along the river, described fish assemblages. KEYWORDS.Fish assemblages, freshwater, species diversity, river. RESUMEN.Los ríos presentan un gradiente longitudinal desde su naciente hasta su desembocadura, con los consiguientes cambios en sus características ambientales y en la composición específica. El objetivo de este trabajo fue describir esa variación longitudinal en las características de la fauna de peces del Río Ceballos-Saldán. Los muestreos se realizaron en cinco puntos, ubicados antes y después de las ciudades más importantes, durante un año. Los ensambles de peces fueron descriptos a través de la composición específica, abundancia, riqueza, diversidad y dominancia, atributos que fueron estimados para cada localidad de muestreo. Se aplicaron diferentes modelos especie/ abundancia a cada ensamble de peces a lo largo del curso. Se capturaron 1.914 individuos pertenecientes a 17 especies. Once corresponden a primeras citas para este río. El orden más representativo fue el de los Siluriformes y la especie más abundante fue Hypostomus cordovae (Günther, 1880). La abundancia total fue el único atributo que varió significativamente a lo largo del curso, siendo menor antes de la ciudad de Río Ceballos. Los ensambles de peces fueron significativamente descriptos por tres modelos diferentes de abundancia poblacional, a lo largo del río. PALABRAS-CLAVE.Ensamble de peces, río, diversidad de especies.

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“…Subsequently, food items were grouped into categories of preference using the method proposed by Morato-Gomes (unpublished  Seasonal differences in the diet composition for each bay were determined by the Bray-Curtis similarity index, using percentage numerical data (Washington 1984).…”

Section: Iri = %F × (%N + %W)mentioning

confidence: 99%

Diet composition of red bandfish, Cepola macrophthalma (Actinopterygii: Perciformes: Cepolidae), from the Aegean Sea of Turkey

Sever¹,

Ilhan²

2016

Acta Ichthyol. Piscat.

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Background. The red bandfi sh, Cepola macrophthalma (Linnaeus, 1758), is a benthic fi sh usually not exceeding 450 cm in length. It occurs in the eastern Atlantic from the British Isles to the north of Senegal and is also common throughout the Mediterranean Sea. The red bandfi sh has no commercial value and is often represented in the discarded catch. The knowledge of the feeding ecology, of non-commercial as well as commercial species, is essential for implementing a multispecies approach to fi shery management. Studies on red bandfi sh feeding biology have been rather scarce and the majority of them lacked taxonomical approach. The presently reported study constitutes the fi rst report on the diet of Cepola macrophthalma from two bays on the Turkish coast. Material and methods. The study was based on the specimens of Cepola macrophthalma collected in İzmir Bay and Sığacık Bay from May 2005 to June 2006. The following basic parameters were calculated, based on the data collected during the analysis of red bandfi sh diet: relative number of food items in the gut content, frequency of occurrence, and relative weight of total gut content. Principal food items were determined using the index of relative importance (%IRI). The differences in the diet composition were tested for length groups and seasons by using the Bray-Curtis similarity index for both areas studied. Results. A total of 380 stomachs were examined in two bays. According to the analyses a total of 18 different prey species belonging to nine major systematic groups were found, i.e., Anthomedusae, Siphonophora, Polychaeta, Crustacea, Mollusca, Chaetognatha, Appendicularia, Thaliacea, and Actinopterygii. Concerning overall diet composition, crustaceans (especially copepods) were the most important prey in terms of %IRI, %N, %F, and %W in all seasons. In this study, a total of 80 taxa were found and identifi ed. According to the Bray-Curtis similarity index, the diet of the red bandfi sh was similar within all seasons for both areas. Conclusion. Stomach content analysis of red bandfi sh showed that it is a zooplanktophagous species. In addition to bottom species it feeds also on pelagic organisms. This fact indicates ontogenetically based food preferences of the species.

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Diversity, biotic and similarity indices

Cited by 690 publications

References 99 publications

Recent occurrence ofCylindrospermopsis raciborskiiin Waikato lakes of New Zealand

Recent occurrence ofCylindrospermopsis raciborskiiin Waikato lakes of New Zealand

Composición y estructura de la ictiofauna del Río Ceballos-Saldán (Córdoba, Argentina)

Diet composition of red bandfish, Cepola macrophthalma (Actinopterygii: Perciformes: Cepolidae), from the Aegean Sea of Turkey

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