论文部分内容阅读
根据2003~2011年的东南太平洋智利竹筴鱼(Trachurus murphyi)生产统计数据及海表水温(SST)数据,以经纬度方向上偏移幅度和栖息地的铺展面积作为衡量指标,基于作业网次和单位捕捞努力量渔获量用外包络法建立各月的栖息地适应指数模型,分析各月适宜栖息的海表水温范围。以2003~2011年各月历史均温为基础,研究海表水温分别升高和降低0.5、1、2℃,适宜栖息地的经纬度偏移幅度与铺展面积变化情况。结果显示,东南太平洋智利竹筴鱼的栖息地随着SST的升高,有明显的向南移动趋势,5月、8月适宜栖息地面积逐渐减少,而6~7月份适宜栖息地面积则增加了;当SST下降时,智利竹筴鱼适宜栖息地有向北移动的趋势,同时适宜栖息地面积增加。研究结果可用于分析厄尔尼诺现象和拉尼娜现象对东南太平洋智利竹筴鱼栖息地以及渔场空间分布的影响。
According to the production statistics and the sea surface temperature (SST) data of Trachurus murphyi in Southeast Pacific from 2003 to 2011, the deviation in latitude and longitude and the spreading area of habitat were taken as the indexes, Catch of fishing effort per unit The habitat adaptability index model of each month was established by outsourcing method, and the suitable sea surface water temperature range for each month was analyzed. Based on the historical average temperature of each month from 2003 to 2011, the variation of latitude and longitude and the spreading area of suitable habitat were studied when the sea surface water temperature increased and decreased by 0.5, 1 and 2 ℃, respectively. The results showed that the habitat of the Chilean Mackerel in the southeast Pacific had a trend of moving southward with the increase of SST, the suitable habitat area gradually decreased in May and August, and the suitable habitat area increased from June to July ; When the SST is declining, the suitable habitat for Chilean mackerels has a tendency to move northwards, and at the same time the suitable habitat area increases. The results of the study can be used to analyze the impact of the El Niño and La Niña phenomena on the habitat and fishery spatial distribution of chile fishing in the southeast Pacific.