Ichthyoplankton is an essential component of pelagic ecosystems, and environmental factors play an important role in determining its distribution. We have investigated simultaneous latitudinal and cross-shelf gradients in ichthyoplankton abundance to test the hypothesis that the large-scale distribution of fish larvae in the South Brazil Shelf is associated with water mass composition. Vertical plankton tows were collected between 21 degrees 27' and 34 degrees 51'S at 107 stations, in austral late spring and early summer seasons. Samples were taken with a conical-cylindrical plankton net from the depth of chlorophyll maxima to the surface in deep stations, or from 10 m from the bottom to the surface in shallow waters. Salinity and temperature were obtained with a CTD/rosette system, which provided seawater for chlorophyll-a and nutrient concentrations. The influence of water mass on larval fish species was studied using Indicator Species Analysis, whereas environmental effects on the distribution of larval fish species were analyzed by Distance-based Redundancy Analysis. Larval fish species were associated with specific water masses: in the north, Sardinella brasiliensis was found in Shelf Water; whereas in the south, Engraulis anchoita inhabited the Plata Plume Water. At the slope, Tropical Water was characterized by the bristlemouth Cyclothone acclinidens. The concurrent analysis showed the importance of both cross-shelf and latitudinal gradients on the large-scale distribution of larval fish species. Our findings reveal that ichthyoplankton composition and large-scale spatial distribution are determined by water mass composition in both latitudinal and cross-shelf gradients.
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Univ Western Australia, Sch Environm Syst Engn, Australian Natl Facil Ocean Gliders, Crawley, WA 6009, Australia
Univ Western Australia, UWA Oceans Inst, Crawley, WA 6009, AustraliaUniv Western Australia, Sch Environm Syst Engn, Australian Natl Facil Ocean Gliders, Crawley, WA 6009, Australia
Pattiaratchi, Charitha
Hollings, Ben
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Univ Western Australia, Sch Environm Syst Engn, Australian Natl Facil Ocean Gliders, Crawley, WA 6009, Australia
Univ Western Australia, UWA Oceans Inst, Crawley, WA 6009, AustraliaUniv Western Australia, Sch Environm Syst Engn, Australian Natl Facil Ocean Gliders, Crawley, WA 6009, Australia
Hollings, Ben
Woo, Mun
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Univ Western Australia, Sch Environm Syst Engn, Australian Natl Facil Ocean Gliders, Crawley, WA 6009, Australia
Univ Western Australia, UWA Oceans Inst, Crawley, WA 6009, AustraliaUniv Western Australia, Sch Environm Syst Engn, Australian Natl Facil Ocean Gliders, Crawley, WA 6009, Australia
Woo, Mun
Welhena, Thisara
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Univ Western Australia, Sch Environm Syst Engn, Australian Natl Facil Ocean Gliders, Crawley, WA 6009, Australia
Univ Western Australia, UWA Oceans Inst, Crawley, WA 6009, AustraliaUniv Western Australia, Sch Environm Syst Engn, Australian Natl Facil Ocean Gliders, Crawley, WA 6009, Australia
机构:
China Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R ChinaChina Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
Wang, Zhen
Xian, Benzhong
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State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China
China Univ Petr, Coll Geosci, Beijing 102249, Peoples R ChinaChina Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
Xian, Benzhong
Liu, Jingyan
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China Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R ChinaChina Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
Liu, Jingyan
Fan, Caiwei
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China Natl Offshore Oil Corp, Zhanjiang Branch, Zhanjiang 524057, Peoples R ChinaChina Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
Fan, Caiwei
Li, Hui
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China Natl Offshore Oil Corp, Zhanjiang Branch, Zhanjiang 524057, Peoples R ChinaChina Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
Li, Hui
Wang, Junhui
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China Univ Petr, Coll Geosci, Beijing 102249, Peoples R ChinaChina Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
Wang, Junhui
Zhang, Ximeng
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PetroChina Huabei Oilfield Co, Renqiu 062552, Hebei, Peoples R ChinaChina Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
Zhang, Ximeng
Huang, Handong
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China Univ Petr, Coll Geosci, Beijing 102249, Peoples R ChinaChina Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
Huang, Handong
Tan, Jiancai
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China Natl Offshore Oil Corp, Zhanjiang Branch, Zhanjiang 524057, Peoples R ChinaChina Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
Tan, Jiancai
Chen, Peng
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China Univ Petr, Coll Geosci, Beijing 102249, Peoples R ChinaChina Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
Chen, Peng
Liu, Jianping
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Minist Nat Resources, Guangzhou Marine Geol Survey, Guangzhou 510075, Peoples R ChinaChina Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China