Co-occurrence of earthworms in urban surroundings: A null model analysis of community structure

Tiho, Seydou; Josens, Guy

doi:10.1016/j.ejsobi.2006.10.004

Cited by 67 publications

(71 citation statements)

References 22 publications

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“…Other similar causes what could be related to the homogeneity of the studied habitats (Franca and Araujo 2007), or interactions between species with similar ecological characteristics (Tondoh 2006;Tiho and Johens 2007). In an opposite scenario, the presence of interspecific competition and ecological differentiation denotes the absence of random patterns in species association (Ulrich 2004;Rodríguez-Fernandez et al 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Secondly, a Checkerboard score ("C-score"), a quantitative index of occurrence, was applied, which measures the extent to which species co-occur less frequently than expected by chance alone (Gotelli 2000(Gotelli , 2001. Gotelli and Entsminger (2009), Tiho and Johens (2007), and Tondoh (2006) suggested that the following robust statistical models should be used in a co-occurrence analysis. First, the matrix layout needs to include the species names in the rows and the sites in the columns.…”

Section: Methodsmentioning

confidence: 99%

“…In a competitively structured community the observed variance ratio should be significantly smaller than expected by chance (Tiho and Johens, 2007). All null model analyses were carried out using the software Ecosim version 7.0 (Tondoh, 2006;Tiho and Johens, 2007;De los Ríos 2008;De los Ríos et al 2008b;Gotelli and Entsminger, 2009).…”

Section: Methodsmentioning

confidence: 99%

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Inland water microcrustacean assemblages in an altitudinal gradient in Aysen region (46° S, Patagonia Chile)

2014

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The Chilean Patagonia has numerous kinds of inland water ecosystems such as lakes, ponds, wetlands and rivers that have been poorly studied due to access difficulties. This study was carried out in Aysen region, in southern Chile, and it included different kinds of water bodies such as rivers, streams, ponds, lagoons and lakes distributed along an altitudinal gradient at 46° S. It was found a low species number, essentially cladocerans, copepods and amphipods. A null model was applied in order to determine the existence of regulator factors of species associations, and the results revealed that they are not random. The patterns would be influenced by geographical and limnological characteristics of the studied sites. Our results would agree with regional studies on habitat heterogeneity such as in Torres del Paine National Park and other zones in Tierra del Fuego island.Keywords: microcrustaceans, Boeckella, Hyalella, null models, Patagonia Crustáceos zooplâncton de águas continentais litorales na gradiente de altitude na região de Aysén (46 ° S, Patagônia Chile) ResumoA Patagônia chilena apresenta numerosos tipos de ecossistemas aquáticos, como lagos, lagoas, pântanos e rios, os quais tem sido pouco estudados devido a dificuldades de acesso. Este estudo foi feito na região de Aysén, no sul do Chile, e inclui diferentes tipos de corpos d'água, tais como rios, córregos, lagos, lagoas e lagos distribuídos ao longo de um gradiente de altitude a 46° S. Constatou-se baixo número de espécies que inclui, essencialmente, cladóceros, copépodos e anfípodos. Um modelo nulo foi aplicado para determinar a existência de fatores reguladores das associações de espécies os resultados indicam que estes não são aleatórios. Os padrões poderiam ser influenciados pelas características geográficas e limnológicas do locais estudados. Os resultados expostos concordariam com estudos regionais sobre com habitats heterogeneidade como Torres del Paine Parque Nacional e outras zonas na ilha de Tierra del Fuego.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Inland water microcrustacean assemblages in an altitudinal gradient in Aysen region (46° S, Patagonia Chile)

2014

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“…(3) Fixed-Proportional: in this algorithm the species occurrence totals are maintained as in the original community, and the probability that a species will occur at a site (column) is proportional to the column total for that sample. The null model analyses were performed using Ecosim version 7.0 software (Gotelli and Entsminger, 2007;Tiho and Josens, 2007;Tondoh, 2006).…”

Section: Discussionmentioning

confidence: 99%

Crustacean communities in coastal ephemeral pools in the Araucanía region (38° S, Chile)

Ríos-Escalante

Acevedo

2016

Braz. J. Biol.

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The fauna communities of ephemeral pools in southern Chile are characterized by heterogeneity of crustacean taxa; nevertheless, no detailed studies exist of their community structure. The aim of the present study was to analyze the crustacean community structure in two groups of ephemeral pools (Puaucho and Nigue pools) in the coastal zone of the Araucanía region. A correlation matrix was made by species abundance against temperature, conductivity, pH and total dissolved solids. In a second step, a null model for species co-occurrence was applied to the total data and to each group. The results for total data revealed a significant direct relation between the abundance of H. costera, C. dubia and Mesocyclops. For the Puaucho pools, the same results were found together with direct associations with total dissolved solids, conductivity and pH. Finally, different results were found for the Nigue pools, with no clear significant associations, either direct or indirect, between the abundance of different crustacean taxa and abiotic parameters. These results were supported by the co-occurrence null model analysis, which revealed the presence of regulator factors for the total data, and for each of the two groups. Ecological topics are discussed with emphasis on meta-community dynamics.Keywords: cladocerans, copepods, ostracods, amphipods, communities. Comunidades de crustáceos em lagoas efêmeras costeiras na região de Araucanía (38° S, Chile) ResumoAs comunidades faunísticas das lagoas efêmeras do sul do Chile são caracterizadas pela heterogeneidade dos seus táxons. Entretanto, estudos detalhados da sua estrutura de comunidade ainda não existem. O objetivo do presente estudo foi analisar a estrutura da comunidade de crustáceos em dois grupos de lagoas efêmeras (Puaucho e Nigue) na zona costeira da região de Araucanía. A matriz de correlação foi feita com a abundância das espécies em função da temperatura, condutividade, pH e sólidos totais dissolvidos. Num segundo passo, um modelo nulo para as espécies de coocorrência foi aplicado aos dados totais e para cada grupo. Os resultados para os dados totais revelaram uma relação direta e significativa entre a abundância de H. costera, C. dubia e Mesocyclops. Para as lagoas Puaucho, os mesmos resultados foram encontrados, juntamente com associações diretas com sólidos totais dissolvidos, condutividade e pH. Finalmente, diferentes resultados foram encontrados para as lagoas Nigue, sem associações significativas claras, diretas ou indiretas entre a abundância de diferentes táxons de crustáceos e parâmetros abióticos. Estes resultados foram suportados pela análise de modelo de coocorrência nula, a qual revelou a presença de fatores reguladores para o total de dados, e para cada um dos dois grupos. Temas ecológicos são discutidos com ênfase na dinâmica de meta-comunidade.

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“…Este enfoque en ecología es más robusto en comparación a otros enfoques estadísticos porque considera la presencia y ausencia de azar como paso previo al análisis estadístico de las comunidades (Gotelli & Graves, 1996;Gotelli, 2000Gotelli, , 2001Tondoh, 2006;Tiho & Johens, 2007). Estos modelos nulos han sido aplicados para ecología de comunidades terrestres (Tondoh, 2006;Tiho & Johens, 2007), y recientemente para estudios de ecología de comunidades zooplanctónicas en ambientes acuáticos chilenos continentales, específicamente en cuanto a asociaciones de especies (De los Ríos, 2008;De los Ríos & Soto, 2009) El objetivo del presente estudio es comparar los ensambles zooplanctónicos en lagunas poco profundas permanentes y estacionales obtenidos desde la literatura (De los Ríos et al, 2008), mediante el modelo nulo de sobreposición de tamaño, con el fin de entender si hay presencia o ausencia de factores reguladores sobre la estructura comunitaria.…”

Section: Introductionunclassified

Uso De Modelos Nulos Para Comparar Estructura Zooplanctónica en Tres Lagos De La Región De Aysén, Chile

Ríos-Escalante

Sobenes²,

Parra

2013

Anales Instituto Patagonia (Chile)

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The zooplanktonic communities in Chilean inland waters are characterized by the high calanoid copepods dominante and low species number that is due to the oligotrophy and wide conductivity gradient. A view point in ecology is the null models use for determine that the community has not structural factors. The aim of the present study is analyze the zooplanktonic structure in three lakes of Aysen region with null models based in size overlap, with the aim of support or reject the traditional ecological results that described the presence of regulator factors in community structure. The results of size overlap revealed that the size structure is random, that is due to the absence of food resources limitation, interespecific competency absence and colonization and extinction population process.Keywords: zooplankton, communities, null models, Patagonia. RESUMENLas comunidades zooplanctónicas en aguas continentales chilenas se caracterizan por la alta dominancia de copépodos calanoideos y el bajo número de especies lo que se debe a la oligotrofía y alto gradiente de conductividad. Un enfoque de estudio de la ecología de comunidades es el uso de modelos nulos que consisten en demostrar que la estructura de la comunidad no está estructurada por factores reguladores. El objetivo del presente estudio es analizar la estructura zooplanctónica en tres lagos de la

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Co-occurrence of earthworms in urban surroundings: A null model analysis of community structure

Cited by 67 publications

References 22 publications

Inland water microcrustacean assemblages in an altitudinal gradient in Aysen region (46° S, Patagonia Chile)

Inland water microcrustacean assemblages in an altitudinal gradient in Aysen region (46° S, Patagonia Chile)

Crustacean communities in coastal ephemeral pools in the Araucanía region (38° S, Chile)

Uso De Modelos Nulos Para Comparar Estructura Zooplanctónica en Tres Lagos De La Región De Aysén, Chile

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