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Morphometry and retention time as forcing functions to establishment and maintenance of aquatic macrophytes in a tropical reservoir/Morfometria e tempo de residencia como fatores determinantes no estabelecimento e manutencao de macrofitas aquaticas em um reservatorio tropical.(Original Article)

Cunha-Santino, M.B. ; Fushita, A.T. ; Peret, A.C. ; Bianchini, I., Jr.

Brazilian Journal of Biology, 2016, Vol.76(3), p.673(13)

ISSN: 1519-6984 ; DOI: 10.1590/1519-6984.24214

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  • Nhan đề:
    Morphometry and retention time as forcing functions to establishment and maintenance of aquatic macrophytes in a tropical reservoir/Morfometria e tempo de residencia como fatores determinantes no estabelecimento e manutencao de macrofitas aquaticas em um reservatorio tropical.(Original Article)
  • Tác giả: Cunha-Santino, M.B. ; Fushita, A.T. ; Peret, A.C. ; Bianchini, I., Jr.
  • Chủ đề: Reservoirs (Water) – Maintenance and Repair ; Reservoirs (Water) – Surveys ; Aquatic Ecosystems – Surveys ; Biodiversity – Surveys
  • Là 1 phần của: Brazilian Journal of Biology, 2016, Vol.76(3), p.673(13)
  • Mô tả: Macrophytes may constitute an important resource for several chemical, physical and biological processes within aquatic ecosystems. This study considers that in tropical reservoirs with low retention time and with low values of shoreline development (DL), the expansion and persistence of aquatic macrophytes are mainly reported to local conditions (e.g., hydrodynamic and wind exposure) rather than trophic status and depth of the euphotic zone. In this context, this study aimed at describing and comparing the incidence of aquatic macrophytes in a throughflowing, non-dendritic tropical reservoir. During February 2006 to November 2007, eight limnological surveys were performed quarterly within the Ourinhos Reservoir, and in the mouth areas of its tributaries. At the six sampling stations 30 variables were measured. The number of sites with plants varied between 21 and 38 and at the end of the 1st year the total richness was found. The sampling survey outcome the recognition of 18 species of aquatic macrophytes; Cyperaceae (2 genera and 1 species), Pontederiaceae (3 species) and Onarograceae (3 genera) were the families with higher diversity. Seven species (Typha domingensis Pers., Myriophyllum aquaticum (Vell.) Verdec, Salvinia auriculata Aubl., Eichhornia azurea (Sw.) Kunth, Eleocharis sp1, Eichhornia crassipes (Mart.) Solms, Oxycaryum cubense (Poepp. & Kunth) Lye) always were present and were more frequent in the sites. The occurrence of emergent species predominated (45.9%), followed by submersed rooted (24.5%), free floating (19.5%), floating rooted (9.7%) and free submersed (0.3%). Although limnological variables and the distribution of macrophytes have discriminated the same sampling points, the stepwise multiple linear regressions did not pointed out strong correspondences (or coherence) among the most constant and distributed macrophyte species and the selected limnological variables, as well the trophic statuses. Seeing the low relationship among limnological variables and macrophytes distribution, in the case of Ourinhos Reservoir, the results pointed out that the water turbulence, low DL and wind exposure are the main driving forces that determine its aquatic plant distribution, life forms and species composition. Keywords: aquatic plants, biodiversity, population dynamic, drive functions, limnological constrains, Paranapanema River, Ourinhos HPP. As macrofitas podem constituir um recurso importante para varios processos fisicos, quimicos e biologicos dos ecossistemas aquaticos. Esse estudo considera que nos reservatorios tropicais com baixo tempo de retencao e com baixos valores do grau de desenvolvimento das margens (DL), a expansao e manutencao das macrofitas aquaticas sao referidas principalmente as condicoes locais (e.g., hidrodinamica e exposicao ao vento), ao inves do estado trofico e da profundidade de zona eufotica. Nesse contexto, o presente estudo teve como objetivo descrever e comparar a incidencia de macrofitas aquaticas em um reservatorio tropical de fluxo rapido e nao dendritico. De fevereiro de 2006 a novembro de 2007, oito avaliacoes limnologicas foram realizadas trimestralmente no reservatorio Ourinhos e nas regioes de desembocadura de seus afluentes. Nas seis estacoes de amostragem 30 variaveis foram determinadas. O numero de locais com plantas variou entre 21 e 38 e no final do primeiro ano o numero total de especies foi encontrado. Foram relacionadas 18 especies de macrofitas aquaticas; Cyperaceae (2 generos e especies), Pontederiaceae (3 especies) e Onarograceae (3 generos) foram as familias com mais diversidade. Sete especies (Typha domingensis Pers.,Myriophyllum aquaticum (Veil.) Verdec, Salvinia auriculata Aubl., Eichhornia azurea (Sw.) Kunth, Eleocharis spl, Eichhornia crassipes (Mart.) Solms, Oxycaryum cubense (Poepp. & Kunth) Lye) sempre estiveram presentes e foram as mais frequentes. As ocorrencias de especies emergentes predominaram (45,9%), seguidas das submersas enraizadas (24,5%), flutuantes livres (19,5%), flutuantes enraizadas (9,7%) e submersas livres (0,3%). Embora as variaveis limnologicas e as distribuicoes de macrofitas tenham discriminado os mesmo pontos de coleta, regressoes lineares multiplas stepwise nao apontaram correspondencias fortes (ou coerentes) entre as especies de macrofitas mais constantes e distribuidas e as variaveis limnologicas, assim como os estados troficos. No reservatorio Ourinhos, a baixa relacao entre as variaveis limnologicas e a distribuicao das macrofitas aponta que a turbulencia da agua, o baixo valor de Dl e a exposicao ao vento sejam as principais forcas que determinam a distribuicao das plantas aquaticas, as suas formas de vida e a composicao das especies. Palavras-chave: plantas aquaticas, biodiversidade, dinamica de populacao, funcoes de forca, condicionantes limnologicas, rio Paranapanema, UHE Ourinhos.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 1519-6984 ; DOI: 10.1590/1519-6984.24214

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