Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da UFRRJ |
Texto Completo: | https://tede.ufrrj.br/jspui/handle/jspui/3311 |
Resumo: | Lajes reservoir was built a hundred years ago, and is a "type-lake" reservoir with an area of approximately 30 km2, on the slopes of the Sea Mountains, with inflow contribution of small streams, lacking major routes for fish migration and a defluence of 20 m3/sec through the turbines of a hydroelectric plant. In this relatively closed system, we evaluated changes in fish assemblages along the daily cycle (sunset, night, sunrise and day) in two areas with different levels of physical structure (presence or absence of artificial shelters). We hypothesized that the fish community has greater richness and abundance in areas with the presence of artificial shelters, and that diel changes determine structure of the fish assemblage in this ?type-lake? reservoir. Fish sampling were carried out monthly, between September 2005 and August 2006, using gill nets (30 m long ? 2.5 high, with mesh size ranging from 1.5 to 7 cm between adjacent knots). A total of 192 samples (450m2 of nets / sample) was performed, collecting 1934 individuals (1230 in the sheltered area and 704 in the not sheltered area). Metynnis maculatus, a non-native characiforme, was the most abundant species, accounting for approximately 25% of the total number of fishes. The community structure did not differ between the two areas, although a higher number of fishes and a higher number of M. maculatus (P < 0.05) were found for the area with artificial shelters. Other species (e.g. Astyanax parahybae, Astyanax bimaculatus and Loricariichthys castaneus) had higher abundance in the area with shelters but no significant differences were detected between the two areas. Loricariichtys castaneus was the only species with higher numerical and biomass abundance in the area lacking shelters. Changes in structure of the fish assemblages were observed along the diel cycle in both, sheltered and not sheltered areas, with the period of the day differing from the other periods. The number of fishes, number of species, Margalef richness and Shannon Diversity were significantly higher during the night e lower during the day for both areas. Astyanax parahybae had the most contribution to the average similarity for the night period, whereas Geophagus brasiliensis was the characteristic species for the period of the day in both areas. Cichla kelberi showed preference for the sunrise and sunset periods. Seasonal changes in environmental condition, although not particularly relevant for structuring fish community, had two more defined periods; the Spring-Summer, coinciding with the highest rainfall, and Autumn-Winter, coinciding with the dry season. Metynnis maculatus and G. brasiliensis were typical species of the Spring-Summer. Astyanax parahybae (in the area provided with shelters) and C. kelberi (in the area lacking shelters) were typical species of the Autumn-Winter, according to SIMPER. Besides rainfall, water level were more important factors structuring fish community than the environmental variables of temperature, dissolved oxygen, pH and conductivity, although responses were species-specific to different environmental variables. The hypothesis of higher abundance in the area provided with shelters was accepted, although richness and structure community did not change between the two areas. Moreover, the hypothesis that diel changes are important for structuring fish assemblages was accepted, being good predictors of fish abundance and richness in this ?type-lake? reservoir. |
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Ara?jo, Francisco Gerson040.983.233-20Ara?jo, Francisco GersonSantos, Gilmar BastosPinto, Benjamin Carvalho TeixeiraAlbieri, Rafael Jardim091.824.347-51http://lattes.cnpq.br/0119695663069555Uehara, Wagner2020-02-14T17:43:25Z2014-06-10UEHARA, Wagner. Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais. 2014. 49 f. Disserta??o (Mestrado em Biologia Animal) - Instituto de Biologia. Departamento de Biologia Animal, Universidade Federal Rural do Rio de Janeiro, Serop?dica - RJ. 2014.https://tede.ufrrj.br/jspui/handle/jspui/3311Lajes reservoir was built a hundred years ago, and is a "type-lake" reservoir with an area of approximately 30 km2, on the slopes of the Sea Mountains, with inflow contribution of small streams, lacking major routes for fish migration and a defluence of 20 m3/sec through the turbines of a hydroelectric plant. In this relatively closed system, we evaluated changes in fish assemblages along the daily cycle (sunset, night, sunrise and day) in two areas with different levels of physical structure (presence or absence of artificial shelters). We hypothesized that the fish community has greater richness and abundance in areas with the presence of artificial shelters, and that diel changes determine structure of the fish assemblage in this ?type-lake? reservoir. Fish sampling were carried out monthly, between September 2005 and August 2006, using gill nets (30 m long ? 2.5 high, with mesh size ranging from 1.5 to 7 cm between adjacent knots). A total of 192 samples (450m2 of nets / sample) was performed, collecting 1934 individuals (1230 in the sheltered area and 704 in the not sheltered area). Metynnis maculatus, a non-native characiforme, was the most abundant species, accounting for approximately 25% of the total number of fishes. The community structure did not differ between the two areas, although a higher number of fishes and a higher number of M. maculatus (P < 0.05) were found for the area with artificial shelters. Other species (e.g. Astyanax parahybae, Astyanax bimaculatus and Loricariichthys castaneus) had higher abundance in the area with shelters but no significant differences were detected between the two areas. Loricariichtys castaneus was the only species with higher numerical and biomass abundance in the area lacking shelters. Changes in structure of the fish assemblages were observed along the diel cycle in both, sheltered and not sheltered areas, with the period of the day differing from the other periods. The number of fishes, number of species, Margalef richness and Shannon Diversity were significantly higher during the night e lower during the day for both areas. Astyanax parahybae had the most contribution to the average similarity for the night period, whereas Geophagus brasiliensis was the characteristic species for the period of the day in both areas. Cichla kelberi showed preference for the sunrise and sunset periods. Seasonal changes in environmental condition, although not particularly relevant for structuring fish community, had two more defined periods; the Spring-Summer, coinciding with the highest rainfall, and Autumn-Winter, coinciding with the dry season. Metynnis maculatus and G. brasiliensis were typical species of the Spring-Summer. Astyanax parahybae (in the area provided with shelters) and C. kelberi (in the area lacking shelters) were typical species of the Autumn-Winter, according to SIMPER. Besides rainfall, water level were more important factors structuring fish community than the environmental variables of temperature, dissolved oxygen, pH and conductivity, although responses were species-specific to different environmental variables. The hypothesis of higher abundance in the area provided with shelters was accepted, although richness and structure community did not change between the two areas. Moreover, the hypothesis that diel changes are important for structuring fish assemblages was accepted, being good predictors of fish abundance and richness in this ?type-lake? reservoir.O reservat?rio de Lajes foi constru?do h? pouco mais de um s?culo sendo um reservat?rio ?tipo-lago? com aproximadamente 30 km2 de ?rea, localizado na encosta da Serra do Mar, e formado a partir da contribui??o de pequenos riachos, com aus?ncia de grandes rotas migrat?rias para os peixes e com deflu?ncia total de 20 m3/seg atrav?s das turbinas da usina hidrel?trica. Neste sistema relativamente fechado, avaliaram-se as mudan?as nas assembleias de peixes ao longo do ciclo nictimeral (anoitecer, noite, amanhecer e dia) em duas ?reas com diferentes n?veis de estrutura??o f?sica (presen?a ou n?o de abrigos artificias). Hipotetizamos que a comunidade de peixes apresentaria maior riqueza e abund?ncia nas ?reas com a presen?a de abrigos, e que as varia??es nictimerais determinariam a estrutura da comunidade neste reservat?rio ?tipo-lago?. As amostragens foram realizadas mensalmente entre Setembro de 2005 e Agosto de 2006, com redes de espera (30 m de comprimento ? 2.5 de altura; malhas de 1,5-7 cm entre n?s adjacentes). Um total de 192 amostras (450 m2 de redes/amostra) foi obtido, capturando 1934 indiv?duos (1230 na ?rea com abrigos e 704 na ?rea sem abrigos). A estrutura da comunidade n?o diferiu entre as ?reas, embora tenha se verificado maior numero de peixes na ?rea com abrigos. Metynnis maculatus, um characiforme n?o nativo, foi a esp?cie mais abundante, correspondendo a aproximadamente 25% do n?mero total de peixes capturados. Considerando cada ?rea separadamente, a ?rea com abrigos apresentou maior contribui??o num?rica de M. maculatus (P < 0.05), embora outras esp?cies tenham tamb?m sido mais abundantes nesta ?rea, mas as diferen?as entre as ?reas n?o foram significativas (P > 0,05) (e.g. Astyanax parahybae, Astyanax bimaculatus e Loricariichthys castaneus). Loricariichtys castaneus foi a esp?cie de maior abund?ncia num?rica e em biomassa na ?rea sem abrigos. Diferen?as na estrutura das assembleias de peixes ao longo do ciclo nictimeral foram detectadas tanto na ?rea com abrigos como na ?rea sem abrigos, com o per?odo do dia sendo diferenciado dos demais per?odos. A abund?ncia num?rica, n?mero de esp?cies, riqueza de Margalef e diversidade de Shannon foram maiores durante a noite e menores durante o dia em ambas as ?reas. Astyanax parahybae foi a esp?cie de maior contribui??o para a similaridade m?dia no per?odo da noite enquanto Geophagus brasiliensis foi a esp?cie caracter?stica do per?odo do dia, em ambas as ?reas. J? Cichla kelberi se caracterizou como a esp?cie de prefer?ncias pelos per?odos anoitecer e amanhecer. Varia??es sazonais nas condi??es ambientais, embora n?o muito relevantes para a estrutura??o da ictiofauna, apresentaram uma separa??o entre a primavera-ver?o, coincidindo com maiores pluviosidades, e o outono-inverno, coincidindo com menores pluviosidades. Metynnis maculatus e G. brasiliensis foram esp?cies caracter?sticas do per?odo Primavera-Ver?o. Astyanax paraybae (na ?rea com abrigos) e C. kelberi (na ?rea sem abrigos) foram caracter?sticas do Outono-Inverno, de acordo com SIMPER. Al?m da pluviosidade, tamb?m a cota (n?vel da represa) foram fatores mais importantes na estrutura??o da comunidade de peixes do que as vari?veis ambientais de temperatura, oxig?nio dissolvido, pH e condutividade, embora as respostas de cada esp?cie sejam espec?ficas para as diferentes vari?veis ambientais. A hip?tese de maior abund?ncia na ?rea com abrigos foi aceita, embora a riqueza e a estrutura das assembl?ias n?o tenham diferido entre as ?reas. Tamb?m foi aceita a hip?tese de que varia??es nictimerais s?o importantes na estrutura??o da assembleia de peixes, sendo boas preditoras da abundancia e da riqueza de esp?cies neste reservat?rio ?tipo-lago?.Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2020-02-14T17:43:25Z No. of bitstreams: 1 2014 - Wagner Uehara.pdf: 1005188 bytes, checksum: 54d7031bc2152d8544a12390d5173109 (MD5)Made available in DSpace on 2020-02-14T17:43:25Z (GMT). No. of bitstreams: 1 2014 - Wagner Uehara.pdf: 1005188 bytes, checksum: 54d7031bc2152d8544a12390d5173109 (MD5) Previous issue date: 2014-06-10CAPESapplication/pdfhttps://tede.ufrrj.br/retrieve/12832/2014%20-%20Wagner%20Uehara.pdf.jpghttps://tede.ufrrj.br/retrieve/17398/2014%20-%20Wagner%20Uehara.pdf.jpghttps://tede.ufrrj.br/retrieve/23684/2014%20-%20Wagner%20Uehara.pdf.jpghttps://tede.ufrrj.br/retrieve/30074/2014%20-%20Wagner%20Uehara.pdf.jpghttps://tede.ufrrj.br/retrieve/36460/2014%20-%20Wagner%20Uehara.pdf.jpghttps://tede.ufrrj.br/retrieve/42850/2014%20-%20Wagner%20Uehara.pdf.jpghttps://tede.ufrrj.br/retrieve/49198/2014%20-%20Wagner%20Uehara.pdf.jpghttps://tede.ufrrj.br/retrieve/55658/2014%20-%20Wagner%20Uehara.pdf.jpgporUniversidade Federal Rural do Rio de JaneiroPrograma de P?s-Gradua??o em Biologia AnimalUFRRJBrasilInstituto de Ci?ncias Biol?gicas e da Sa?deictiofaunamudan?as temporaisreservat?riosabrigos artificiaistemporal changesreservoirsartificial reefsEcologiaVaria??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiaisChanges in fish assemblages in a tropical reservoir along the diel cycle in areas with and lacking artificial sheltersinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da UFRRJinstname:Universidade Federal Rural do Rio de Janeiro (UFRRJ)instacron:UFRRJTHUMBNAIL2014 - Wagner Uehara.pdf.jpg2014 - Wagner Uehara.pdf.jpgimage/jpeg1943http://localhost:8080/tede/bitstream/jspui/3311/18/2014+-+Wagner+Uehara.pdf.jpgcc73c4c239a4c332d642ba1e7c7a9fb2MD518TEXT2014 - Wagner Uehara.pdf.txt2014 - Wagner Uehara.pdf.txttext/plain107664http://localhost:8080/tede/bitstream/jspui/3311/17/2014+-+Wagner+Uehara.pdf.txtf7d41d7c751280734140e37664d72c19MD517ORIGINAL2014 - Wagner Uehara.pdf2014 - Wagner Uehara.pdfapplication/pdf1005188http://localhost:8080/tede/bitstream/jspui/3311/2/2014+-+Wagner+Uehara.pdf54d7031bc2152d8544a12390d5173109MD52LICENSElicense.txtlicense.txttext/plain; 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dc.title.por.fl_str_mv |
Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais |
dc.title.alternative.eng.fl_str_mv |
Changes in fish assemblages in a tropical reservoir along the diel cycle in areas with and lacking artificial shelters |
title |
Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais |
spellingShingle |
Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais Uehara, Wagner ictiofauna mudan?as temporais reservat?rios abrigos artificiais temporal changes reservoirs artificial reefs Ecologia |
title_short |
Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais |
title_full |
Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais |
title_fullStr |
Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais |
title_full_unstemmed |
Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais |
title_sort |
Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais |
author |
Uehara, Wagner |
author_facet |
Uehara, Wagner |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Ara?jo, Francisco Gerson |
dc.contributor.advisor1ID.fl_str_mv |
040.983.233-20 |
dc.contributor.referee1.fl_str_mv |
Ara?jo, Francisco Gerson |
dc.contributor.referee2.fl_str_mv |
Santos, Gilmar Bastos |
dc.contributor.referee3.fl_str_mv |
Pinto, Benjamin Carvalho Teixeira |
dc.contributor.referee4.fl_str_mv |
Albieri, Rafael Jardim |
dc.contributor.authorID.fl_str_mv |
091.824.347-51 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/0119695663069555 |
dc.contributor.author.fl_str_mv |
Uehara, Wagner |
contributor_str_mv |
Ara?jo, Francisco Gerson Ara?jo, Francisco Gerson Santos, Gilmar Bastos Pinto, Benjamin Carvalho Teixeira Albieri, Rafael Jardim |
dc.subject.por.fl_str_mv |
ictiofauna mudan?as temporais reservat?rios abrigos artificiais |
topic |
ictiofauna mudan?as temporais reservat?rios abrigos artificiais temporal changes reservoirs artificial reefs Ecologia |
dc.subject.eng.fl_str_mv |
temporal changes reservoirs artificial reefs |
dc.subject.cnpq.fl_str_mv |
Ecologia |
description |
Lajes reservoir was built a hundred years ago, and is a "type-lake" reservoir with an area of approximately 30 km2, on the slopes of the Sea Mountains, with inflow contribution of small streams, lacking major routes for fish migration and a defluence of 20 m3/sec through the turbines of a hydroelectric plant. In this relatively closed system, we evaluated changes in fish assemblages along the daily cycle (sunset, night, sunrise and day) in two areas with different levels of physical structure (presence or absence of artificial shelters). We hypothesized that the fish community has greater richness and abundance in areas with the presence of artificial shelters, and that diel changes determine structure of the fish assemblage in this ?type-lake? reservoir. Fish sampling were carried out monthly, between September 2005 and August 2006, using gill nets (30 m long ? 2.5 high, with mesh size ranging from 1.5 to 7 cm between adjacent knots). A total of 192 samples (450m2 of nets / sample) was performed, collecting 1934 individuals (1230 in the sheltered area and 704 in the not sheltered area). Metynnis maculatus, a non-native characiforme, was the most abundant species, accounting for approximately 25% of the total number of fishes. The community structure did not differ between the two areas, although a higher number of fishes and a higher number of M. maculatus (P < 0.05) were found for the area with artificial shelters. Other species (e.g. Astyanax parahybae, Astyanax bimaculatus and Loricariichthys castaneus) had higher abundance in the area with shelters but no significant differences were detected between the two areas. Loricariichtys castaneus was the only species with higher numerical and biomass abundance in the area lacking shelters. Changes in structure of the fish assemblages were observed along the diel cycle in both, sheltered and not sheltered areas, with the period of the day differing from the other periods. The number of fishes, number of species, Margalef richness and Shannon Diversity were significantly higher during the night e lower during the day for both areas. Astyanax parahybae had the most contribution to the average similarity for the night period, whereas Geophagus brasiliensis was the characteristic species for the period of the day in both areas. Cichla kelberi showed preference for the sunrise and sunset periods. Seasonal changes in environmental condition, although not particularly relevant for structuring fish community, had two more defined periods; the Spring-Summer, coinciding with the highest rainfall, and Autumn-Winter, coinciding with the dry season. Metynnis maculatus and G. brasiliensis were typical species of the Spring-Summer. Astyanax parahybae (in the area provided with shelters) and C. kelberi (in the area lacking shelters) were typical species of the Autumn-Winter, according to SIMPER. Besides rainfall, water level were more important factors structuring fish community than the environmental variables of temperature, dissolved oxygen, pH and conductivity, although responses were species-specific to different environmental variables. The hypothesis of higher abundance in the area provided with shelters was accepted, although richness and structure community did not change between the two areas. Moreover, the hypothesis that diel changes are important for structuring fish assemblages was accepted, being good predictors of fish abundance and richness in this ?type-lake? reservoir. |
publishDate |
2014 |
dc.date.issued.fl_str_mv |
2014-06-10 |
dc.date.accessioned.fl_str_mv |
2020-02-14T17:43:25Z |
dc.type.status.fl_str_mv |
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UEHARA, Wagner. Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais. 2014. 49 f. Disserta??o (Mestrado em Biologia Animal) - Instituto de Biologia. Departamento de Biologia Animal, Universidade Federal Rural do Rio de Janeiro, Serop?dica - RJ. 2014. |
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https://tede.ufrrj.br/jspui/handle/jspui/3311 |
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UEHARA, Wagner. Varia??es nas assembl?ias de peixes de um reservat?rio tropical ao longo do ciclo nictimeral em ambientes providos ou n?o com abrigos artificiais. 2014. 49 f. Disserta??o (Mestrado em Biologia Animal) - Instituto de Biologia. Departamento de Biologia Animal, Universidade Federal Rural do Rio de Janeiro, Serop?dica - RJ. 2014. |
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Universidade Federal Rural do Rio de Janeiro |
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Brasil |
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Instituto de Ci?ncias Biol?gicas e da Sa?de |
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Universidade Federal Rural do Rio de Janeiro |
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