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Diet and trophic structure of the fish fauna in a subtropical ecosystem: impoundment effects Neotropical Ichthyology
Delariva,Rosilene Luciana; Hahn,Norma Segatti; Kashiwaqui,Elaine Antoniassi Luiz.
This study examined the diet and trophic structure of the fish fauna, over temporal and spatial scales, as affected by the impoundment of the Iguaçu River in the region of Salto Caxias, Paraná State, Brazil. Sampling was conducted before (March 1997 - February 1998) and after the impoundment (March 1999 - February 2000), at four sampling sites. The stomach contents were analyzed by the volumetric method. The species could be organized in 10 trophic guilds: algivores, carcinophages, detritivores, herbivores, aquatic insectivores, terrestrial insectivores, invertivores, omnivores, piscivores, and planktivores; the first and last guilds were represented only in the post-impoundment period. Similarity patterns and feeding changes were summarized by a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Feeding; Guilds; Iguaçu River; Reservoir; Temporal changes.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000400891
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Species composition and richness of avifauna in an urban area of southern Brazil - DOI: 10.4025/actascibiolsci.v32i1.6118 Biological Sciences
Philippsen, Juliana Strieder; UEM; Benedito, Evanilde; UEM; Zawadzki, Cláudio Henrique; UEM.
The urban environment has become an object of study by ornithologists, who seek to understand the relationships between this new habitat and the birds that survive within it. Aiming to investigate the composition and richness of the avifauna present at the State University of Maringá and identify temporal changes in species composition, the obtained results were compared to the study accomplished by Krügel (1998) in this same location. Thus, we performed field samplings from August 2007 to July 2008, using transects, with visual and auditive identification. We recorded 74 species belonging to 27 families from 12 orders, during 72 hours of observation. Most species were constant in the study area. The predominant trophic categories were insectivores (46%)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Avifauna; Temporal changes; Urban environment; Trophic categories 2.05.00.00-9 Avifauna; Temporal changes; Urban environment; Trophic categories.
Ano: 2009 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/6118
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Temporal changes in caiçara artisanal fishing and alternatives for management: a case study on the southeastern Brazilian coast Biota Neotropica
Lopes,Priscila Fabiana Macedo; Begossi,Alpina.
This paper describes a case study of the changes in fishing that occurred in a Brazilian coastal community after a 10 year interval (1992-2002). There was a decrease in the mean amount of fish caught daily (from 14 kg to 11.32 kg) and annually (from 4.2 t to 3.4 t) and in the richness of species caught (from 21 to 17 species); there was also a low similarity in the species composition of the fish landings (Morisita-Horn index Ch = 0.24). These changes suggested a decline in the locally exploited fish populations, which probably caused the discontinuation of commercial artisanal fishing. However, the diversity of fish caught by hook and line and purse-seine fishing was higher in the second period, whereas there was no significant difference in the diversity...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fishery; Atlantic coast community; Co-management; Temporal changes.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000200005
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Coral cover decline on La Chola reef (Eastern Tropical Pacific) Boletín de Investigaciones
López-Victoria,Mateo; Zapata,Fernando A..
ABSTRACT La Chola Reef is located at the easternmost sector of the Eastern Tropical Pacific. This coral formation of 11 ha is dominated by branching corals of the genus Pocillopora. The main goal of this study was to evaluate changes in coral cover over time, by comparing data collected in 2002 and 2013, implementing the chain transect methodology. Additionally, we generated an up-to-date map of this reef using field data collected with a GPS and present the first in-situ water temperature data. The reef exhibited a 20% coral cover decline during the study period, with associated increases in algal cover (mainly coralline algae). Total extension of the reef seems to have remained stable during the last 30 years. Besides the usual stressors commonly...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reef dynamics; Temporal changes; Colombian Pacific; Coral cover; Low water temperature.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612018000100107
Registros recuperados: 4
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