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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/25109

Title: The Spatial and Temporal Distribution Patterns of the Argentine Short- Finned Squid, Illex argentinus, Abundance in the Southwest Atlantic and the Effects of Environmental Influences
Authors: Chih-Shin Chen;Tai-Sheng Chiu;Wen-Bin Haung
Contributors: NTOU:Institute of Marine Affairs and Resource Managemen
Keywords: Illex argentinus;Squid abundance;Environmental influence;SST;Southern Oscillation Index (SOI)
Date: 2007
Issue Date: 2011-10-20T08:21:18Z
Publisher: Zoological Studies
Abstract: abstract:The spatial and temporal distribution patterns of the Argentine short-finned squid, Illex argentinus, abundances and relationships between the squid abundance and environmental variables in the Southwest Atlantic were analyzed using a geographical information system and statistical methods. The abundances of squid were estimated by standardizing commercial catch per unit effort (CPUE) data from the Taiwanese squid fishery during 1986-2003. Illex argentinus has a clear general annual migration pattern, which consistently occurred in different years. The monthly distribution patterns of sea surface temperature (SST) corresponded to the current systems in the Southwest Atlantic. Local squid abundances showed a negative correlation with SSTs during Mar.-Aug., although it was difficult to determine if this reflected any causal link. The Southern Oscillation Index (SOI) and SSTs on the southern and northern portions of the Patagonian Shelf were analyzed to investigate the teleconnection between them and a lag-effect on squid abundances. SSTs on both the southern and northern portions of the Patagonian shelf showed a link with the SOI, at respective lag times of 2 and 3 yr. No significant correlation was found between the SOI and squid abundances, or between SSTs of the southern portion of the Patagonian Shelf and squid abundances within the calculated range of the time lag (10 yr), while SSTs of the northern portion of the shelf were negatively correlated with squid abundances with a lag of 1 yr. Cold events on the northern portion of the Patagonian Shelf in the previous year could be a key factor for the high squid abundance in the current year. Whether or not there are high or low abundances, the distribution patterns of squid on the Patagonian Shelf are locally influenced by the presence of thermal fronts, which are themselves dependent upon the distribution and strength of the cold currents.
Relation: 46(1), pp.111-122
URI: http://ntour.ntou.edu.tw/handle/987654321/25109
Appears in Collections:[海洋事務與資源管理研究所] 期刊論文

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