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Registro Completo |
Biblioteca(s): |
Embrapa Pantanal. |
Data corrente: |
26/04/2004 |
Data da última atualização: |
27/03/2017 |
Autoria: |
WANTZEN, K. M.; MACHADO, F. de A.; VOSS, M.; BORISS, H.; JUNK, W. J. |
Afiliação: |
Max-Planck-Institute of Limnology, Plon, Germany. Universidade Federal de Mato Grosso, Instituto de Biociencias, Cuiaba, MT, Brazil. Baltic Sea Research Institute, SeestraBe, Rostock, Germany. |
Título: |
Seasonal isotopic shifts in fish of the Pantanal wetland, Brazil. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
Aquatic Science, v.64, p.239-251, 2002. |
Idioma: |
Inglês |
Conteúdo: |
Seasonal inundations shape the floodplain characteristics of the Pantanal, a large wetland in Central South America. In the first study combining stable carbon and nitrogen isotope analysis with classical stomach content analysis in this region, we investigated the influence of the annual inundation on diet and isotopic composition of floodplain fish. Apart from potential food items, 33 fish species from the Coqueiro lake were analyzed, 10 of which were present during both the wet and dry season 1999. A 13C and 15N plot of the floodplain ecosystem allowed us to assess a foodchain 0f 3-4 trophic levels. However, the wide overlap of nitrogen values suggested that the organisms act on trophic continua rather than on distinct levels. The foodweb was based mainly on C3-plant carbon. However, fish species capable of feeding on terrestrial invertebrates (e.g., Brycon microlepis) had 13C values above -25%, indicating 13-30% intake of C4-plant based carbon during the flooding period. The novel use of vector corrdinates and 2-dimensional ANOVA showed that the seasonal isotopic shifts of 13C and 15N were higly significant for some feeding guilds. 15N values increased from the wet to dry season in most fish species and these shifts were higly significant for omnivores (Astyanax bimaculatus, Triportheus nematurus, Tetragonopterus argenteus and Moenkhausia dichroura), and significant for invertivores (Gymnogeophagus balzanii and Poptella paraguayensis) and carnivores Serrasalmus spilopleura). Average carbon isotope ratios decreased at the same time in the herbivores (Methynnis mola: 3.4%) and detritivores (Psectrogaster curviventris: 5.3%), but they did nodt change in the hypostomaticx herbivore Sturisoma robustum. We explain these shifts by abundant and variable food sources during the inundation period and increasing carnivory and starvation during the dry season when the lake is confined to its central basin. Isotopic shifts between seasons were more prominent in less specialized species of omnivores, invertivores and some carnivores, whereas more specialized herbivores and detritivores appeared to be more inlfuenced by changes in the carbon isotope ratio of the diet affected by biogeochemical process such as respiration and methanogenesis. A general model for the interpretation of isotope data of floodplain fish considering different time-scales is given. MenosSeasonal inundations shape the floodplain characteristics of the Pantanal, a large wetland in Central South America. In the first study combining stable carbon and nitrogen isotope analysis with classical stomach content analysis in this region, we investigated the influence of the annual inundation on diet and isotopic composition of floodplain fish. Apart from potential food items, 33 fish species from the Coqueiro lake were analyzed, 10 of which were present during both the wet and dry season 1999. A 13C and 15N plot of the floodplain ecosystem allowed us to assess a foodchain 0f 3-4 trophic levels. However, the wide overlap of nitrogen values suggested that the organisms act on trophic continua rather than on distinct levels. The foodweb was based mainly on C3-plant carbon. However, fish species capable of feeding on terrestrial invertebrates (e.g., Brycon microlepis) had 13C values above -25%, indicating 13-30% intake of C4-plant based carbon during the flooding period. The novel use of vector corrdinates and 2-dimensional ANOVA showed that the seasonal isotopic shifts of 13C and 15N were higly significant for some feeding guilds. 15N values increased from the wet to dry season in most fish species and these shifts were higly significant for omnivores (Astyanax bimaculatus, Triportheus nematurus, Tetragonopterus argenteus and Moenkhausia dichroura), and significant for invertivores (Gymnogeophagus balzanii and Poptella paraguayensis) and carnivores Serrasalmus spilopleu... Mostrar Tudo |
Palavras-Chave: |
America do Sul; Area alagada; Ciclo alimentar; Food web; Isotopo estavel; Sazonal; Seasonal floodplain; Stable isotope. |
Thesagro: |
Análise de Dados; Peixe. |
Thesaurus Nal: |
data analysis; fish; Pantanal; South America. |
Categoria do assunto: |
-- |
Marc: |
LEADER 03232naa a2200337 a 4500 001 1794397 005 2017-03-27 008 2002 bl --- 0-- u #d 100 1 $aWANTZEN, K. M. 245 $aSeasonal isotopic shifts in fish of the Pantanal wetland, Brazil. 260 $c2002 520 $aSeasonal inundations shape the floodplain characteristics of the Pantanal, a large wetland in Central South America. In the first study combining stable carbon and nitrogen isotope analysis with classical stomach content analysis in this region, we investigated the influence of the annual inundation on diet and isotopic composition of floodplain fish. Apart from potential food items, 33 fish species from the Coqueiro lake were analyzed, 10 of which were present during both the wet and dry season 1999. A 13C and 15N plot of the floodplain ecosystem allowed us to assess a foodchain 0f 3-4 trophic levels. However, the wide overlap of nitrogen values suggested that the organisms act on trophic continua rather than on distinct levels. The foodweb was based mainly on C3-plant carbon. However, fish species capable of feeding on terrestrial invertebrates (e.g., Brycon microlepis) had 13C values above -25%, indicating 13-30% intake of C4-plant based carbon during the flooding period. The novel use of vector corrdinates and 2-dimensional ANOVA showed that the seasonal isotopic shifts of 13C and 15N were higly significant for some feeding guilds. 15N values increased from the wet to dry season in most fish species and these shifts were higly significant for omnivores (Astyanax bimaculatus, Triportheus nematurus, Tetragonopterus argenteus and Moenkhausia dichroura), and significant for invertivores (Gymnogeophagus balzanii and Poptella paraguayensis) and carnivores Serrasalmus spilopleura). Average carbon isotope ratios decreased at the same time in the herbivores (Methynnis mola: 3.4%) and detritivores (Psectrogaster curviventris: 5.3%), but they did nodt change in the hypostomaticx herbivore Sturisoma robustum. We explain these shifts by abundant and variable food sources during the inundation period and increasing carnivory and starvation during the dry season when the lake is confined to its central basin. Isotopic shifts between seasons were more prominent in less specialized species of omnivores, invertivores and some carnivores, whereas more specialized herbivores and detritivores appeared to be more inlfuenced by changes in the carbon isotope ratio of the diet affected by biogeochemical process such as respiration and methanogenesis. A general model for the interpretation of isotope data of floodplain fish considering different time-scales is given. 650 $adata analysis 650 $afish 650 $aPantanal 650 $aSouth America 650 $aAnálise de Dados 650 $aPeixe 653 $aAmerica do Sul 653 $aArea alagada 653 $aCiclo alimentar 653 $aFood web 653 $aIsotopo estavel 653 $aSazonal 653 $aSeasonal floodplain 653 $aStable isotope 700 1 $aMACHADO, F. de A. 700 1 $aVOSS, M. 700 1 $aBORISS, H. 700 1 $aJUNK, W. J. 773 $tAquatic Science$gv.64, p.239-251, 2002.
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Embrapa Pantanal (CPAP) |
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Registro Completo
Biblioteca(s): |
Embrapa Rondônia. |
Data corrente: |
06/06/2000 |
Data da última atualização: |
15/01/2009 |
Autoria: |
OLIVEIRA, S. J. de M.; UTUMI, M. M.; PRADO, E. E. do; GODINHO, V. de P. C. |
Título: |
Aspectos econômicos da soja em Rondônia - 1999. |
Ano de publicação: |
1999 |
Fonte/Imprenta: |
Porto Velho: Embrapa-CPAF Rondônia, 1999. |
Páginas: |
5 p. |
Série: |
(Embrapa-CPAF Rondônia. Comunicado Técnico, 167). |
Idioma: |
Português |
Conteúdo: |
Este trabalho proporciona informações economicas sobre a soja no Estado de Rondônia. |
Palavras-Chave: |
Aspecto economico; Brasil; Economic situation; Production; Productivity; Rondonia. |
Thesagro: |
Fitotecnia; Glycine Max; Preço; Produção; Produtividade; Soja. |
Thesaurus NAL: |
Amazonia; Brazil; prices; soybeans. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01000nam a2200361 a 4500 001 1704085 005 2009-01-15 008 1999 bl uuuu u0uu1 u #d 100 1 $aOLIVEIRA, S. J. de M. 245 $aAspectos econômicos da soja em Rondônia - 1999. 260 $aPorto Velho: Embrapa-CPAF Rondônia$c1999 300 $a5 p. 490 $a(Embrapa-CPAF Rondônia. Comunicado Técnico, 167). 520 $aEste trabalho proporciona informações economicas sobre a soja no Estado de Rondônia. 650 $aAmazonia 650 $aBrazil 650 $aprices 650 $asoybeans 650 $aFitotecnia 650 $aGlycine Max 650 $aPreço 650 $aProdução 650 $aProdutividade 650 $aSoja 653 $aAspecto economico 653 $aBrasil 653 $aEconomic situation 653 $aProduction 653 $aProductivity 653 $aRondonia 700 1 $aUTUMI, M. M. 700 1 $aPRADO, E. E. do 700 1 $aGODINHO, V. de P. C.
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