Large-Scale Ichthyoplankton and Water Mass Distribution along the South Brazil Shelf

被引:48
|
作者
Pinto de Macedo-Soares, Luis Carlos [1 ,2 ]
Eiras Garcia, Carlos Alberto [3 ]
Freire, Andrea Santarosa [1 ]
Muelbert, Jose Henrique [2 ]
机构
[1] Univ Fed Santa Catarina, Dept Ecol & Zool, Lab Crustaceos & Plancton, Programa Posgrad Ecol, Florianopolis, SC, Brazil
[2] Univ Fed Rio Grande, Inst Oceanog, Lab Ecol Ictioplancton, Rio Grande, RS, Brazil
[3] Univ Fed Rio Grande, Inst Oceanog, Lab Estudos Oceanos & Clima, Rio Grande, RS, Brazil
来源
PLOS ONE | 2014年 / 9卷 / 03期
关键词
LARVAL FISH ASSEMBLAGES; ANCHOVY ENGRAULIS-ANCHOITA; OCEANOGRAPHIC CONDITIONS; REPRODUCTIVE HABITATS; LATITUDINAL GRADIENTS; CONTINENTAL-SHELF; COASTAL LAGOON; PATTERNS; MYCTOPHIDAE; DIVERSITY;
D O I
10.1371/journal.pone.0091241
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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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页数:14
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