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| Mcrea, Je; Greene, Hg; O'Connell, Vm; Wakefield, Ww. |
| The application of marine geophysics and GIS techniques to the characterization of benthic habitats has increased the ability of fisheries managers to assess distribution and habitat types beyond common practices. We report upon a 150 kHz sidescan sonar survey offshore of Kruzof Island, Alaska undertaken to characterize rockfish (Sebastes) habitat. Using GIS, MapGrafix and Map*Factory we determined the percentage of seafloor cover that exists in our survey area. Bathymetry in the study area was determined with sidescan interferometry. All XYZ data were gridded using Surfer and plotted in shaded relief, bathymetric contour, and 3-dimensional formats. Contoured bathymetry was used as an overlay in MapGrafix. Small sub-areas were extracted from the... |
| Tipo: Text |
Palavras-chave: Habitat; Mégahabitat; Mésohabitat; Balayage; Cartographie; Habitat; Megahabitat; Mesohabitat; Sidescan; Mapping. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43591/44031.pdf |
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| Teresa,Fabrício Barreto; Souza,Luzia Shirlei de; Silva,Dianne Michelle Alves da; Barbosa,Hugo de Oliveira; Lima,Jane Dilvana; Nabout,João Carlos. |
| ABSTRACT Riffles are unique habitats regarding to assemblage structure. However, understanding how these assemblages respond to environmental variations in small spatial extents, as within a stream, is a challenge. We assess whether the quantitative structure and the trophic composition of fish assemblages vary predictably among stream riffles. We predict that the variation of environmental conditions will explain species abundance and trophic composition, with the latter presenting higher predictive power, since species would be filtered according to their traits (e.g. diet). Moreover, we expect that the low among-riffle dispersal limitation within a stream and the strong habitat filtering would result in lower importance of spatial variables in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental filters; Mass effect; Mesohabitat; Metacommunity; Trophic composition. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000300206 |
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| Esteves,Katharina Eichbaum; Silva,Marcelo Horikoshi Candido; Nanini-Costa,Maressa Helena; Petesse,Maria Letizia. |
| ABSTRACT This study aimed to determine whether fish species occupy different mesohabitats, as defined by specific criteria of substrate types in Atlantic Forest blackwater streams. We sampled fourteen coastal blackwater rivers along the coast of São Paulo State, Brazil, during the low-flow season (June-September/2016). For each stream, we selected three mesohabitat types (sand, leaf-litter and trunks) in a 100 m river stretch. We sampled 41 mesohabitats, 31 of which contained fish, resulting in 15 species. When multivariate analysis of variance (MANOVA) was applied to the mesohabitat abiotic variables, no significant differences were indicated between them. ANOSIM for species density and biomass and Redundancy Analyses (RDAs) for species density, biomass... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Community structure; Leaf-litter; Mesohabitat; Spatial distribution; Substrate types. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000100212 |
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| OLIVEIRA,JANE C.F.; PEREIRA-RIBEIRO,JULIANE; WINCK,GISELE R.; ROCHA,CARLOS F.D.. |
| Abstract Data on the structure of lizard communities in the different biomes and ecosystems of Brazil are still limited. In this study, we related the species richness, abundance and the spatial occurrence of lizards to the structure of the vegetation found on the coast of the state of Espírito Santo, southeastern Brazil, to determine whether habitat influences the structure of lizard communities. We conducted fieldwork in 2012, 2013 and 2014, collecting data in standardized samples. We analyze whether variables of vegetation structure influenced species richness and abundance, using Generalized Linear Models (GLMs). We recorded 12 lizard species from eight families. In general, species richness and abundance were similar among sites. Locally, we recorded... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Community ecology; Community structure; Mesohabitat; Squamata. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100602 |
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