Contribuição dos ovos de resistência de Cladocera (Crustacea: Branchiopoda) para a recolonização de ambientes lacustres temporários

Detalhes bibliográficos
Autor(a) principal: Guimarães, Wesley Luiz [UNESP]
Data de Publicação: 2016
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://hdl.handle.net/11449/136465
Resumo: Floodplains are wetlands where the oxbow lakes can be found. Due of the dry season and its shallow depth, these lagoons can present seasonal occurrence. Such disruption can lead some zooplankton populations, such as cladocerans, to enter in dormancy, producing resting eggs that are deposited in dry sediment forming a bank of eggs. When the lagoons back to fill the cladoceran community quickly restores, probably as a result of the hatch of eggs present in the sediment. To detect species of cladocerans that produce resting eggs as a strategy for recolonization, as well as the factors influencing the eggs hatch, may help understanding the egg bank's role as zooplankton biodiversity source in lagoons. Our goal in this study was to investigate the potential of cladocerans to recolonize of temporary lagoons, through the hatching of resting eggs in specific experimental conditions. The zooplankton community was sampled in four lagoons located in the Turvo River floodplain. Sampling of planktonic cladocerans were taken by a plankton 50 µm mesh net before and after the drying lagoons. Physical and chemical parameters as depth, transparency, temperature, pH, conductivity, OD, chlorophyll and suspended material were also measured. For the hatching experiments of resting eggs in laboratory, sediment from lagoons were sampled using a corer (4.5 cm diameter), during the dry season. Two methods were tested to indicate the most effective for the hatching: 1. Environment Treatment: bottles with sediment and water from the Turvo river kept at ambient conditions; 2. Chamber Treatment: bottles with sediment and water from the Turvo river kept under controlled conditions in a growth chamber (23 ° C and photoperiod 12:12). Every two days each replica was analyzed for physical and chemical parameters and the verification of cladocerans newly hatched. After two weeks these procedures were performed weekly to complete 60 days. A portion of the sediment was used for particle size characterization. Before the drought 23 species were present in the studied lagoons, after drought 16 species. During the hatching experiment Chamber Treatment had 431 hatching while Environment Treatment had 118. Six species hatched: Alona glabra, Ephemeroporus hybridus, Ilyocryptus spinifer, Leydigiops ornata and Notoalona sculpta and Oxyurella longicaudis, being four species in the Chamber Treatment and six species in the Treatment Environment. In the Chamber Treatment, after 7 days, E. hybridus was the first species to hatch, and after 9 days Environment Treatment N. sculpta and I. spinifer hatched. With the analysis of hierarchical partition we found that in the Chamber Treatment conductivity and pH showed a positive correlation and dissolved oxygen a negative correlation with the hatching of resting eggs. In the Environment Treatment, conductivity and dissolved oxygen showed a negative correlation with the eggs hatch. In conclusion we can point that species of Chydoridae and Ilyocryptidae family, which are benthic or littoral organisms have a greater potential to quickly hatch into temporary lacustrine environments.
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spelling Contribuição dos ovos de resistência de Cladocera (Crustacea: Branchiopoda) para a recolonização de ambientes lacustres temporáriosContribution of resistance eggs Cladocera (Crustacea: Branchiopoda) for resettlement temporary lacustres environmentsResting eggsCladoceransMarginal lagoonsDry seasonOvo de resistênciaCladócerosLagoas marginaisEstação secaFloodplains are wetlands where the oxbow lakes can be found. Due of the dry season and its shallow depth, these lagoons can present seasonal occurrence. Such disruption can lead some zooplankton populations, such as cladocerans, to enter in dormancy, producing resting eggs that are deposited in dry sediment forming a bank of eggs. When the lagoons back to fill the cladoceran community quickly restores, probably as a result of the hatch of eggs present in the sediment. To detect species of cladocerans that produce resting eggs as a strategy for recolonization, as well as the factors influencing the eggs hatch, may help understanding the egg bank's role as zooplankton biodiversity source in lagoons. Our goal in this study was to investigate the potential of cladocerans to recolonize of temporary lagoons, through the hatching of resting eggs in specific experimental conditions. The zooplankton community was sampled in four lagoons located in the Turvo River floodplain. Sampling of planktonic cladocerans were taken by a plankton 50 µm mesh net before and after the drying lagoons. Physical and chemical parameters as depth, transparency, temperature, pH, conductivity, OD, chlorophyll and suspended material were also measured. For the hatching experiments of resting eggs in laboratory, sediment from lagoons were sampled using a corer (4.5 cm diameter), during the dry season. Two methods were tested to indicate the most effective for the hatching: 1. Environment Treatment: bottles with sediment and water from the Turvo river kept at ambient conditions; 2. Chamber Treatment: bottles with sediment and water from the Turvo river kept under controlled conditions in a growth chamber (23 ° C and photoperiod 12:12). Every two days each replica was analyzed for physical and chemical parameters and the verification of cladocerans newly hatched. After two weeks these procedures were performed weekly to complete 60 days. A portion of the sediment was used for particle size characterization. Before the drought 23 species were present in the studied lagoons, after drought 16 species. During the hatching experiment Chamber Treatment had 431 hatching while Environment Treatment had 118. Six species hatched: Alona glabra, Ephemeroporus hybridus, Ilyocryptus spinifer, Leydigiops ornata and Notoalona sculpta and Oxyurella longicaudis, being four species in the Chamber Treatment and six species in the Treatment Environment. In the Chamber Treatment, after 7 days, E. hybridus was the first species to hatch, and after 9 days Environment Treatment N. sculpta and I. spinifer hatched. With the analysis of hierarchical partition we found that in the Chamber Treatment conductivity and pH showed a positive correlation and dissolved oxygen a negative correlation with the hatching of resting eggs. In the Environment Treatment, conductivity and dissolved oxygen showed a negative correlation with the eggs hatch. In conclusion we can point that species of Chydoridae and Ilyocryptidae family, which are benthic or littoral organisms have a greater potential to quickly hatch into temporary lacustrine environments.Planícies de inundação são áreas úmidas onde podem ser encontradas as lagoas marginais. Devido ao período de seca e a sua baixa profundidade, estas lagoas podem apresentar caráter temporário com ocorrência sazonal. Tal perturbação pode levar algumas populações zooplanctônicas, como as de cladóceros, a entrarem em estado de dormência, produzindo os ovos de resistência que se depositam no sedimento seco formando um banco de ovos. Quando as lagoas voltam a encher, a comunidade de cladóceros rapidamente se reestabelece, provavelmente como resultado da eclosão dos ovos presentes no sedimento. Detectar espécies de cladóceros que produzem os ovos de resistência como estratégia para recolonização, bem como os fatores que influenciam a eclosão dos ovos, pode auxiliar na compreensão do papel do banco de ovos como fonte de biodiversidade zooplanctônica em lagoas marginais. O objetivo neste estudo foi verificar o potencial de cladóceros para recolonização de lagoas marginais temporárias, por meio da eclosão de ovos de resistência em condições experimentais específicas. A comunidade zooplanctônica foi amostrada em quatro lagoas marginais localizadas na planície de inundação do Rio Turvo. As amostragens dos cladóceros planctônicos foram feitas com rede de plâncton de 50 μm de malha, antes e após um período de seca. Além disso, também foram medidos parâmetros físicos e químicos: profundidade, transparência, temperatura, pH, condutividade, OD, clorofila e material em suspensão. Para a realização dos experimentos de eclosão dos ovos de resistência em laboratório, amostras do sedimento das lagoas foram obtidas com Corer (4,5 cm de diâmetro), durante a estação seca. Duas metodologias foram testadas para indicar qual a mais eficaz para a eclosão: 1. Tratamento ambiente: frascos com sedimento e água do rio Turvo mantidos em condições ambiente; 2. Tratamento câmara: frascos com sedimento e água do rio Turvo mantidos em condições controladas em câmara de germinação (23ºC e fotoperíodo 12:12). A cada dois dias cada réplica foi analisada quanto aos parâmetros físicos e químicos e para a verificação de cladóceros recém eclodidos. Após duas semanas estes procedimentos foram realizados semanalmente até completar 60 dias. Uma porção do sedimento foi utilizada para a caracterização quanto à granulometria. Antes da seca 23 espécies estavam presentes nas lagoas estudadas, após a seca 16 espécies. Durante o experimento de eclosão o tratamento Câmara obteve 431 eclosões enquanto o tratamento Ambiente obteve 118. Houve a eclosão das espécies Alona glabra, Ephemeroporus hybridus, Ilyocryptus spinifer, Leydigiops ornata, Notoalona sculpta e Oxyurella longicaudis, destas eclodiram 6 e 4 espécies no tratamento Ambiente e Câmara, respectivamente. No tratamento Câmara, após 7 dias, E. hybridus foi a primeira espécie a eclodir, e no tratamento Ambiente após 9 dias eclodiram as espécies I. spinifer e N. sculpta. Com a análise da partição hierárquica verificou-se que no tratamento Câmara a condutividade e o pH apresentaram uma correlação positiva com a eclosão dos ovos de resistência e o oxigênio dissolvido uma correlação negativa. No tratamento Ambiente, os parâmetros condutividade e oxigênio dissolvido apresentaram uma correlação negativa com a eclosão dos ovos. Em conclusão pode-se apontar que as espécies da família Chydoridae e Ilyocryptidae, que são organismos bentônicos ou litorâneos, apresentam um maior potencial para rapidamente eclodir em ambientes lacustres temporários.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Universidade Estadual Paulista (Unesp)Castilho Noll, Maria Stela Maioli [UNESP]Panarelli, Eliana AparecidaUniversidade Estadual Paulista (Unesp)Guimarães, Wesley Luiz [UNESP]2016-03-30T18:16:01Z2016-03-30T18:16:01Z2016-03-26info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/11449/13646500086824333004153072P6porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESP2023-10-30T06:06:31Zoai:repositorio.unesp.br:11449/136465Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:25:21.127245Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Contribuição dos ovos de resistência de Cladocera (Crustacea: Branchiopoda) para a recolonização de ambientes lacustres temporários
Contribution of resistance eggs Cladocera (Crustacea: Branchiopoda) for resettlement temporary lacustres environments
title Contribuição dos ovos de resistência de Cladocera (Crustacea: Branchiopoda) para a recolonização de ambientes lacustres temporários
spellingShingle Contribuição dos ovos de resistência de Cladocera (Crustacea: Branchiopoda) para a recolonização de ambientes lacustres temporários
Guimarães, Wesley Luiz [UNESP]
Resting eggs
Cladocerans
Marginal lagoons
Dry season
Ovo de resistência
Cladóceros
Lagoas marginais
Estação seca
title_short Contribuição dos ovos de resistência de Cladocera (Crustacea: Branchiopoda) para a recolonização de ambientes lacustres temporários
title_full Contribuição dos ovos de resistência de Cladocera (Crustacea: Branchiopoda) para a recolonização de ambientes lacustres temporários
title_fullStr Contribuição dos ovos de resistência de Cladocera (Crustacea: Branchiopoda) para a recolonização de ambientes lacustres temporários
title_full_unstemmed Contribuição dos ovos de resistência de Cladocera (Crustacea: Branchiopoda) para a recolonização de ambientes lacustres temporários
title_sort Contribuição dos ovos de resistência de Cladocera (Crustacea: Branchiopoda) para a recolonização de ambientes lacustres temporários
author Guimarães, Wesley Luiz [UNESP]
author_facet Guimarães, Wesley Luiz [UNESP]
author_role author
dc.contributor.none.fl_str_mv Castilho Noll, Maria Stela Maioli [UNESP]
Panarelli, Eliana Aparecida
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Guimarães, Wesley Luiz [UNESP]
dc.subject.por.fl_str_mv Resting eggs
Cladocerans
Marginal lagoons
Dry season
Ovo de resistência
Cladóceros
Lagoas marginais
Estação seca
topic Resting eggs
Cladocerans
Marginal lagoons
Dry season
Ovo de resistência
Cladóceros
Lagoas marginais
Estação seca
description Floodplains are wetlands where the oxbow lakes can be found. Due of the dry season and its shallow depth, these lagoons can present seasonal occurrence. Such disruption can lead some zooplankton populations, such as cladocerans, to enter in dormancy, producing resting eggs that are deposited in dry sediment forming a bank of eggs. When the lagoons back to fill the cladoceran community quickly restores, probably as a result of the hatch of eggs present in the sediment. To detect species of cladocerans that produce resting eggs as a strategy for recolonization, as well as the factors influencing the eggs hatch, may help understanding the egg bank's role as zooplankton biodiversity source in lagoons. Our goal in this study was to investigate the potential of cladocerans to recolonize of temporary lagoons, through the hatching of resting eggs in specific experimental conditions. The zooplankton community was sampled in four lagoons located in the Turvo River floodplain. Sampling of planktonic cladocerans were taken by a plankton 50 µm mesh net before and after the drying lagoons. Physical and chemical parameters as depth, transparency, temperature, pH, conductivity, OD, chlorophyll and suspended material were also measured. For the hatching experiments of resting eggs in laboratory, sediment from lagoons were sampled using a corer (4.5 cm diameter), during the dry season. Two methods were tested to indicate the most effective for the hatching: 1. Environment Treatment: bottles with sediment and water from the Turvo river kept at ambient conditions; 2. Chamber Treatment: bottles with sediment and water from the Turvo river kept under controlled conditions in a growth chamber (23 ° C and photoperiod 12:12). Every two days each replica was analyzed for physical and chemical parameters and the verification of cladocerans newly hatched. After two weeks these procedures were performed weekly to complete 60 days. A portion of the sediment was used for particle size characterization. Before the drought 23 species were present in the studied lagoons, after drought 16 species. During the hatching experiment Chamber Treatment had 431 hatching while Environment Treatment had 118. Six species hatched: Alona glabra, Ephemeroporus hybridus, Ilyocryptus spinifer, Leydigiops ornata and Notoalona sculpta and Oxyurella longicaudis, being four species in the Chamber Treatment and six species in the Treatment Environment. In the Chamber Treatment, after 7 days, E. hybridus was the first species to hatch, and after 9 days Environment Treatment N. sculpta and I. spinifer hatched. With the analysis of hierarchical partition we found that in the Chamber Treatment conductivity and pH showed a positive correlation and dissolved oxygen a negative correlation with the hatching of resting eggs. In the Environment Treatment, conductivity and dissolved oxygen showed a negative correlation with the eggs hatch. In conclusion we can point that species of Chydoridae and Ilyocryptidae family, which are benthic or littoral organisms have a greater potential to quickly hatch into temporary lacustrine environments.
publishDate 2016
dc.date.none.fl_str_mv 2016-03-30T18:16:01Z
2016-03-30T18:16:01Z
2016-03-26
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/11449/136465
000868243
33004153072P6
url http://hdl.handle.net/11449/136465
identifier_str_mv 000868243
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dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Estadual Paulista (Unesp)
publisher.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.source.none.fl_str_mv reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
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instname_str Universidade Estadual Paulista (UNESP)
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reponame_str Repositório Institucional da UNESP
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repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
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