Fechar
Metadados

@PhDThesis{Moraes:2012:PAREVA,
               author = "Moraes, Luiz Eduardo de Souza",
                title = "ECOLOGIA ESPACIAL DA SARDINHA VERDADEIRA (Sardinella brasiliensis 
                         Steindachner 1879): PADR{\~O}ES RELACIONADOS {\`A} VARIABILIDADE 
                         ATMOSF{\'E}RICA E OCE{\^A}NICA NO ATL{\^A}NTICO SUDOESTE",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "2012",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "2012-09-17",
             keywords = "sardinha verdadeira, variabilidade ambiental, 
                         distribui{\c{c}}{\~a}o espacial sensoriamento remoto, Plataforma 
                         Continental sudeste Brasileira, brazilian sardinella, enviromental 
                         variability, spatial distrubuition, remote sensing, Southeastern 
                         Brazilian Bight.",
             abstract = "A distribui{\c{c}}{\~a}o espacial da sardinha verdadeira 
                         (\textit{Sardinella brasiliensis}) foi investigada durante os 
                         est{\'a}gios de vida planct{\^o}nico (embrion{\'a}rio e larvar) 
                         e adulto, empregando-se uma s{\'e}rie de coletas de 
                         ictiopl{\^a}ncton conduzidas entre 1976 e 1993, e dados de 
                         captura pela frota de cerco, no per{\'{\i}}odo de 2000 a 2006. A 
                         caracteriza{\c{c}}{\~a}o do ambiente oceanogr{\'a}fico da 
                         Plataforma Continental Sudeste Brasileira (PCSB) empregou dados 
                         \textit{in situ} e descritores multivariados, criados a partir de 
                         conjuntos de vari{\'a}veis de rean{\'a}lise (Simple Ocean Data 
                         Analysis), no per{\'{\i}}odo de 1976 a 1993, e Sensoriamento 
                         Remoto (SR - TSM, Vento e Clorofila-\$\alpha\$), no 
                         per{\'{\i}}odo entre 2000 e 2006. A variabilidade da estrutura 
                         espacial foi quantificada e descrita atrav{\'e}s de modelos de 
                         regress{\~a}o m{\'u}ltipla, empregando conjuntos de Autovetores 
                         Espaciais como vari{\'a}veis explanat{\'o}rias, representando 
                         padr{\~o}es espaciais em um gradiente de escalas. A 
                         descri{\c{c}}{\~a}o da estrutura espacial empregou um conjunto 
                         predefinido de escalas de refer{\^e}ncia: Escalas Macro - 200 km 
                         a 400 km; Escalas M{\'e}dias - 50 km a 199 km; e Escalas Locais - 
                         < 50 km. Varia{\c{c}}{\~o}es temporais na estrutura espacial 
                         foram testadas quanto {\`a} sua signific{\^a}ncia 
                         estat{\'{\i}}stica, atrav{\'e}s de modelos de An{\'a}lise de 
                         Vari{\^a}ncia (ANOVA) modificados. A influ{\^e}ncia do ambiente 
                         sobre os arranjos espaciais observados (depend{\^e}ncia espacial) 
                         foi explorada atrav{\'e}s de Analises de Codepend{\^e}ncia 
                         Multiescala, sendo interpretada com base nas escalas de 
                         refer{\^e}ncia supracitadas. Os resultados para os est{\'a}gios 
                         planct{\^o}nicos mostram distribui{\c{c}}{\~o}es de ovos 
                         estruturadas principalmente nas escalas M{\'e}dias e Locais. As 
                         distribui{\c{c}}{\~o}es de larvas mostram uma 
                         estrutura{\c{c}}{\~a}o espacial mais evidente, com variabilidade 
                         em escalas Macro e M{\'e}dias. O comportamento temporal da 
                         estrutura espacial mostra uma maior import{\^a}ncia relativa das 
                         escalas Macro nos ver{\~o}es de 1977 e 1993, sugerindo a 
                         ocorr{\^e}ncia de expans{\~o}es e contra{\c{c}}{\~o}es nos 
                         habitats reprodutivos. As varia{\c{c}}{\~o}es temporais na 
                         estrutura espacial n{\~a}o se mostram significativas em nenhum 
                         est{\'a}gio planct{\^o}nico, embora as varia{\c{c}}{\~o}es nas 
                         densidades apresentem-se significativamente estruturadas. As 
                         rela{\c{c}}{\~o}es de depend{\^e}ncia espacial com 
                         vari{\'a}veis termohalinas sugerem contribui{\c{c}}{\~o}es 
                         substanciais da estabilidade t{\'e}rmica superficial, e aportes 
                         continentais, na estrutura{\c{c}}{\~a}o espacial dos habitats 
                         reprodutivos. No est{\'a}gio adulto, a an{\'a}lise dos 
                         descritores multivariados (Sensoriamento Remoto) evidencia forte 
                         variabilidade ambiental nas escalas interanuais. Os resultados 
                         tamb{\'e}m sugerem um padr{\~a}o sazonal de deslocamento 
                         \textit{alongshore}, no qual a esp{\'e}cie se concentra 
                         preferencialmente na plataforma de Santos durante a 
                         transi{\c{c}}{\~a}o ver{\~a}o-outono, deslocando-se para o 
                         setor sul da PCSB durante o inverno. Nos meses precedentes {\`a} 
                         desova (primavera), parte do estoque reocupa a plataforma de 
                         Santos. Embora a estrutura espacial mostre varia{\c{c}}{\~o}es 
                         interanuais significativas, n{\~a}o se observam ciclos temporais 
                         bem definidos em nenhum dos cen{\'a}rios analisados. As 
                         rela{\c{c}}{\~o}es de codepend{\^e}ncia com os descritores 
                         multivariados (dados SR) n{\~a}o mostram comportamento 
                         recorrente, sugerindo uma influ{\^e}ncia significativa de 
                         mecanismos comportamentais no processo de sele{\c{c}}{\~a}o de 
                         habitats, em curtas escalas de tempo. Em escala sazonal, uma 
                         ocupa{\c{c}}{\~a}o alternada dos setores norte e sul da PCSB 
                         pode estar relacionada {\`a} intensifica{\c{c}}{\~a}o dos 
                         principais mecanismos de enriquecimento em escala regional, 
                         notadamente a intensifica{\c{c}}{\~a}o das intrus{\~o}es da 
                         {\'A}gua Central do Atl{\^a}ntico Sul, prevalentes no 
                         ver{\~a}o, e {\`a}s intrus{\~o}es superficiais da Corrente 
                         Costeira do Brasil no inverno. ABSTRACT: The spatial distribution 
                         of the brazilian sardine (\textit{Sardinella brasiliensis}) was 
                         investigated during plantonic (eggs and larvae) and adult stages. 
                         The role of environmental forcing on the spatial configurations 
                         was also explored for the first time. Ichthyoplankton samples were 
                         acquired during a series of oceanographic surveys, conducted 
                         between December 1976 and January 1993. Spatial distribution at 
                         adult stages was inferred from logbook data registering the purse 
                         seine fleet activity between February 2000 and November 2006. 
                         Environmental data included \textit{in situ} temperature and 
                         salinity samples (1976 to 1993), a set of Simple Ocean Data 
                         Analysis (SODA) variables (1976 to 1993); and Remote Sensing (RS) 
                         data (SST, Wind and Chlorophyll--\$\alpha\$) (2000 to 2006). 
                         Prior to analyses, SODA and Remote sensing data were reduced by 
                         Principal Component Analysis, creating a new set of multivariate 
                         gradient descriptors. The spatial structure was decomposed and 
                         quantified through a series of multiple regression models, using 
                         spatial eigenvectors as explanatory variables. The description of 
                         the spatial structures was based on a set of predefined reference 
                         scales: Macro Scales - 200 km to 400 km; Medium Scales - 50 km to 
                         199 km; Local Scales - < 50 km. Temporal variations in the spatial 
                         structure were detected using modified Analysis of Variance 
                         (ANOVA) models. Relationships of spatial dependency with the 
                         physical environment were explored through Multiscale Codependence 
                         Analyses (MCA). Results for the planktonic stages show that the 
                         distributions of eggs were structured mainly in Medium and Local 
                         scales. Spatial structuring is more evident for larvae 
                         distributions, where Macro and Medium scale variability 
                         predominate. Contributions in the Macro scales became more evident 
                         in the summers of 1977 and 1993, which might suggest expansions of 
                         the reproductive habitats. Temporal variations in egg and larvae 
                         densities were significant, although variations in the spatial 
                         structure were not significant at both stages. The reproductive 
                         habitats were characterized by higher surface temperatures and 
                         lower surface salinities, highlighting the importance of surface 
                         thermal stability and freshwater inputs. The analysis of the RS 
                         based multivariate descriptors shows that the Brazilian sardine 
                         spends his adult stages in a highly dynamic environment. Results 
                         also suggest a seasonal migration pattern, in which the sardine 
                         concentrates off Santos during the summer-autumn transition, 
                         moving to the southern sector of the SBB during autumn-winter. In 
                         the spring, fisheries concentrate both at Santos platform, and 
                         between Santa Catarina and Paranagu{\'a}. Changes in the spatial 
                         structure are significant in a interannual scale, and do not seem 
                         to follow regular cycles. Multiscale associations with 
                         multivariate gradient descriptors are characterized by frequent 
                         inversions of the correlation signals. This suggests that, at 
                         short time scales, habitat selection may be mostly driven by 
                         behavioral mechanisms. On a seasonal scale, an alternating 
                         occupation of the northern and southern sectors of the 
                         Southeastern Brazilan Bight might be related with the onset of the 
                         main enrichment mechanisms in a regional scale, namely the South 
                         Atlantic Central Water intrusions, during summer, and the cold and 
                         less saline surface intrusions, provided by the Brazil Coastal 
                         Current, during winter.",
            committee = "Lorenzzetti, Jo{\~a}o Antonio (presidente) and Gherardi, Douglas 
                         Francisco Marcolino (orientador) and Paes, Eduardo Tavares 
                         (orientador) and Muelbert, Jos{\'e} Henrique and Fr{\'e}dou, 
                         Fl{\'a}via Lucena",
           copyholder = "SID/SCD",
         englishtitle = "SPATIAL ECOLOGY OF THE BRAZILIAN SARDINE (Sardinella brasiliensis 
                         Steindachner 1879): PATTERNS RELATED TO ATMOSPHERIC AND OCEANIC 
                         VARIABILITY IN THE SOUTHWESTERN ATLANTIC",
             language = "pt",
                pages = "322",
                  ibi = "8JMKD3MGP7W/3CF6A2S",
                  url = "http://urlib.net/rep/8JMKD3MGP7W/3CF6A2S",
           targetfile = "publicacao.pdf",
        urlaccessdate = "17 jan. 2021"
}


Fechar