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| Diserud, Oh. |
| In this paper, I present a method developed to detect 'extra', or novel, changes in diversity in a naturally fluctuating environment. When comparing samples in order to evaluate changes in community structure, the sampling procedure will inevitably induce randomness in observed species composition and abundance, so two samples may show considerable differences, even if they come from exactly the same community. Sometimes the effort put into the sampling varies as well, leading to the expectation of a further increase in difference. Finally, if there were a temporal distance between the samples, we would like to correct for variations in species abundance occurring naturally due to fluctuating environmental conditions. The test method presented here... |
| Tipo: Text |
Palavras-chave: Structure des communautés; Diversité; Variance environnementale; Dynamique des populations; Modèle d'abondance d'une espèce; Community structure; Diversity index; Environmental variance; Population dynamics; Species abundance model. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00322/43345/42881.pdf |
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| Armenteros, M.; Ruiz-Abierno, A.; Sosa, Y.; Pérez-García, J. A.. |
| Benthic macrofauna and meiofauna distribution patterns were described in a tropical coral reef (Punta Francés, Cuban Archipelago, Caribbean Sea). Density and main taxa composition for macrofauna and meiofauna and species diversity and organismal traits for free-living nematodes were compared among four habitats: seagrass bed, sand flat, dead coral and hard bottom. Strong spatial patterns of distribution across habitats were detected and explained by a complex combination of habitat features. Signal/noise ratio for macrofauna data of distribution was enough strong to detect changes across habitats but the sizes of sampling devices were not adequate to represent the real patterns in the nature. Meiofauna patterns of distribution were driven by the... |
| Tipo: Journal Contribution |
Palavras-chave: Coral reefs; Distribution; Diversity index; Macrofauna. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4552 |
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| Capello,Soledad; Marchese,Mercedes; De Wysiecki,María L.. |
| Orthoptera assemblages associated with macrophytes of floodplain lakes of the Paraná River. The Orthoptera assemblage composition varies considerably, depending on habitat type. This study examines the spatiotemporal relationship between plant diversity, hydrometric level, environmental variables and the Orthoptera richness and abundance in floodplain lakes connected permanently or temporarily with the main channel of the Paraná River. The grasshoppers were collected fortnightly (April 2006May 2007). A total of 17 species were recorded and classified according to their frequency of occurrence in constant (7), accessory (4), or accidental (6) species. In the two lakes, the greater species richness and abundance was recorded in summer, thereby coinciding... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acrididae; Aquatic plants; Diversity index; Hydrological level; Insecta; Tettigonidae. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262013000100010 |
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