IPMA, Instituto Português do Mar e da Atmosfera, Algés, Portugal.
CCMAR, Centro de Ciências do Mar, Universidade do Algarve, Faro, Portugal.
PLoS One. 2022 Jul 1;17(7):e0258630. doi: 10.1371/journal.pone.0258630. eCollection 2022.
Landings by the multi-gear coastal fleet operating off the Portuguese continental coast include about 300 species, from which only a few are the object of management plans. In this study, daily landings (kg trip-1) are used, along with an effort indicator, vessel length overall (LoA), to obtain landings per unit of effort (LPUE) as a proxy for the species relative abundance, for a total of 48 species. LPUE indices were used as a response variable in linear models where year (2012-2016), season, region (north and south) and NAO index were explanatory variables. Seasonal and regional effects were found to significantly affect species abundance for a total of 41 and 40 species respectively, while year trends were found to be significant for 19 species, and the NAO index for 3 species. LPUE density maps are presented for several selected species and a subsample of trips, where VMS records were available. It is proposed that geographic and seasonal changes in LPUE can be used to understand trends in abundance and obtain information that can be used in support regional management plans.
在葡萄牙大陆沿海作业的多渔具船队的捕捞中，包括约 300 种物种，但只有少数几个是管理计划的对象。在本研究中，使用了每日捕捞量（每航次公斤）和努力指标总长（LoA），以获得每单位努力的捕捞量（LPUE）作为相对丰度的替代指标，总共涉及 48 种物种。LPUE 指数被用作线性模型中的因变量，其中年份（2012-2016）、季节、区域（北部和南部）和北大西洋涛动指数（NAO 指数）是解释变量。结果发现，季节和区域效应分别对总共 41 种和 40 种物种的丰度有显著影响，而年份趋势对 19 种物种和 3 种物种的 NAO 指数有显著影响。针对一些选定的物种和部分有 VMS 记录的航次，绘制了 LPUE 密度图。建议可以使用 LPUE 的地理和季节性变化来了解丰度趋势，并获取可用于支持区域管理计划的信息。
