Dissertação

Composição e Abundância do Ictioplâncton na Confluência dos Rios Madeira e Amazonas.

The loss of diversity is one of the main damage to the environment caused by the construction of the reservoirs and it is related to the disappearance of terrestrial habitats by flooding, and the changes produced in the aquatic habitat. These changes reflect, above all, in the availability of food a...

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Autor principal: Mendonça, Alessandra Barros
Grau: Dissertação
Idioma: por
Publicado em: Instituto Nacional de Pesquisas da Amazônia - INPA 2020
Assuntos:
Ictioplâncton
Rios do Amazonas
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/11375
http://lattes.cnpq.br/2351228683231640
id oai:repositorio:1-11375
recordtype dspace
spelling oai:repositorio:1-11375 Composição e Abundância do Ictioplâncton na Confluência dos Rios Madeira e Amazonas. Mendonça, Alessandra Barros Leite, Rosseval Galdino Ictioplâncton Rios do Amazonas The loss of diversity is one of the main damage to the environment caused by the construction of the reservoirs and it is related to the disappearance of terrestrial habitats by flooding, and the changes produced in the aquatic habitat. These changes reflect, above all, in the availability of food and in the reproduction of the fish species, leading to a remarkable structural change on aquatic communities in relation to the originals. This study aimed to estimate the richness and characterize the composition of the ichthyoplankton on the Madeira River and the Amazonas River. Monthly collections were conducted from November 2009 to February 2010, it is using net of ichthyoplankton of the conical type of mesh 350 μm with fluxgate connected to the mouth and a deflator type sled to stabilize it and lad it to the bottom, the samples were preserved in formol 10%. Simultaneously, water samples were collected for the obtaining of the temperature, dissolved oxygen, pH, electric conductivity and turbidity. The abundance of fish eggs and larvae was standardized for 50m3. In the laboratory samples were screened and larvae identified to lowest possible taxonomic level and separated but the degree of flexion of notochord. There were collected 180 samples resulting in the capture of 464 eggs and 165.207 larvae. It was found that among the environmental variables analyzed the pH and electric conductivity were highest in the river Amazonas while the turbidity was highest in the river Madeira. The largest densities of eggs and larvae happened in the month of January for the rivers Amazonas and Madeira and, in the month of February for the river Amazonas downstream. Larvae were found of sixteen families, most abundant families were Hemiodontidae (44,2%) for the river Amazonas, Characidae (34,2%) for the river Madeira and Curimatidae (29,7%) for the river Amazonas downstream. During the period of studies individuals of all the stages were present, but the stages of preflexion and yolk-larval showed values highest. The taxonomic composition was similar among the sites studied. For the river Amazonas and river Madeira similarity was lower (0,635) than between the river Madeira and river Amazonas downstream (0,755). The river Madeira, largest tributary of the river Amazonas, is used as reproduction site by several fish species of the Amazonica region, thus the maintenance of their integrity is important for the preservation of diversity and enhancement of fishery. A perda da diversidade é um dos principais danos causados ao ambiente pela construção de reservatórios e está relacionada tanto ao desaparecimento de hábitats terrestres pelo alagamento, quanto às mudanças produzidas no hábitat aquático. Tais mudanças refletem-se, sobretudo, na disponibilidade alimentar e na reprodução das espécies ícticas, levando a uma notável alteração estrutural das comunidades aquáticas em relação às originais. Este trabalho teve com objetivo estimar a riqueza e caracterizar a composição do ictioplâncton no rio Madeira e no rio Amazonas. Foram realizadas coletas mensais durante o período de novembro de 2009 a fevereiro de 2010, utilizando-se rede de ictioplâncton do tipo cônica de malha 350 μm com fluxímetro acoplado à boca e um deflator tipo trenó para estabilizá-la e conduzi-la ao fundo, as amostras foram fixadas em formol 10%. Simultaneamente, foram coletadas amostras de água para a obtenção da temperatura, do oxigênio dissolvido, de pH, da condutividade elétrica e da turbidez. A abundância de ovos e larvas foi padronizada em 50m3 de água filtrada. Em laboratório, as amostras foram triadas e as larvas identificadas ao menor nível taxonômico possível e separadas pelo grau de flexão da notocorda. Foram coletadas 180 amostras resultando na captura de 464 ovos e 165.207 larvas. Verificou-se que dentre as variáveis ambientais analisadas o pH e a condutividade elétrica foram mais elevados no rio Amazonas enquanto que a turbidez foi mais elevada no rio Madeira. As maiores densidades de ovos e larvas ocorreram no mês de janeiro para o rio Amazonas e o rio Madeira e, no mês de fevereiro para o rio Amazonas à jusante. Foram encontradas larvas de dezesseis famílias, as famílias mais abundantes foram Hemiodontidae (44,2%) para o rio Amazonas, Characidae (34,2%) para o rio Madeira e Curimatidae (29,7%) para o rio Amazonas à jusante. Durante o período de estudos indivíduos de todos os estágios estiveram presentes, contudo os estágios de pré-flexão e larval vitelino apresentaram valores mais elevados. A composição taxonômica foi semelhante entre os locais estudados. Para o rio Amazonas e rio Madeira a similaridade foi menor (0,635) do que entre o rio Madeira e o rio Amazonas à jusante (0,755). O rio Madeira, maior tributário do rio Amazonas, é utilizado como sítio migratório e reprodutivo de várias espécies de peixes da região amazônica, sendo importante a manutenção da integridade deste para a preservação da diversidade e incremento pesqueiro. 2020-02-13T18:22:27Z 2020-02-13T18:22:27Z 2011-08-11 Dissertação https://repositorio.inpa.gov.br/handle/1/11375 http://lattes.cnpq.br/2351228683231640 por Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Instituto Nacional de Pesquisas da Amazônia - INPA Biologia de Água Doce e Pesca Interior - BADPI
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language por
topic Ictioplâncton
Rios do Amazonas
spellingShingle Ictioplâncton
Rios do Amazonas
Mendonça, Alessandra Barros
Composição e Abundância do Ictioplâncton na Confluência dos Rios Madeira e Amazonas.
topic_facet Ictioplâncton
Rios do Amazonas
description The loss of diversity is one of the main damage to the environment caused by the construction of the reservoirs and it is related to the disappearance of terrestrial habitats by flooding, and the changes produced in the aquatic habitat. These changes reflect, above all, in the availability of food and in the reproduction of the fish species, leading to a remarkable structural change on aquatic communities in relation to the originals. This study aimed to estimate the richness and characterize the composition of the ichthyoplankton on the Madeira River and the Amazonas River. Monthly collections were conducted from November 2009 to February 2010, it is using net of ichthyoplankton of the conical type of mesh 350 μm with fluxgate connected to the mouth and a deflator type sled to stabilize it and lad it to the bottom, the samples were preserved in formol 10%. Simultaneously, water samples were collected for the obtaining of the temperature, dissolved oxygen, pH, electric conductivity and turbidity. The abundance of fish eggs and larvae was standardized for 50m3. In the laboratory samples were screened and larvae identified to lowest possible taxonomic level and separated but the degree of flexion of notochord. There were collected 180 samples resulting in the capture of 464 eggs and 165.207 larvae. It was found that among the environmental variables analyzed the pH and electric conductivity were highest in the river Amazonas while the turbidity was highest in the river Madeira. The largest densities of eggs and larvae happened in the month of January for the rivers Amazonas and Madeira and, in the month of February for the river Amazonas downstream. Larvae were found of sixteen families, most abundant families were Hemiodontidae (44,2%) for the river Amazonas, Characidae (34,2%) for the river Madeira and Curimatidae (29,7%) for the river Amazonas downstream. During the period of studies individuals of all the stages were present, but the stages of preflexion and yolk-larval showed values highest. The taxonomic composition was similar among the sites studied. For the river Amazonas and river Madeira similarity was lower (0,635) than between the river Madeira and river Amazonas downstream (0,755). The river Madeira, largest tributary of the river Amazonas, is used as reproduction site by several fish species of the Amazonica region, thus the maintenance of their integrity is important for the preservation of diversity and enhancement of fishery.
author_additional Leite, Rosseval Galdino
author_additionalStr Leite, Rosseval Galdino
format Dissertação
author Mendonça, Alessandra Barros
title Composição e Abundância do Ictioplâncton na Confluência dos Rios Madeira e Amazonas.
title_short Composição e Abundância do Ictioplâncton na Confluência dos Rios Madeira e Amazonas.
title_full Composição e Abundância do Ictioplâncton na Confluência dos Rios Madeira e Amazonas.
title_fullStr Composição e Abundância do Ictioplâncton na Confluência dos Rios Madeira e Amazonas.
title_full_unstemmed Composição e Abundância do Ictioplâncton na Confluência dos Rios Madeira e Amazonas.
title_sort composição e abundância do ictioplâncton na confluência dos rios madeira e amazonas.
publisher Instituto Nacional de Pesquisas da Amazônia - INPA
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/11375
http://lattes.cnpq.br/2351228683231640
_version_ 1787144297120792576
score 11.755432

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