Expansion and contraction of the Engraulis ringens spawning area in northern Chile

IF 0.8 4区 生物学 Q4 MARINE & FRESHWATER BIOLOGY Scientia Marina Pub Date : 2022-12-14 DOI:10.3989/scimar.05284.045
Paola Moreno, G. Claramunt
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Abstract

Many studies have considered the temporal patterns of reproduction of Engraulis ringens, but little attention has been given to the spatial patterns of reproduction (spawning areas), which have shown great variability in both location (geographical position) and extent (the area covered by positive stations), without a satisfactory explanation. Along the Chilean coast, the daily egg production method (DEPM) has been used for several years to estimate spawning biomass in the northern Chile E. ringens population, with 24 surveys being carried out from 1992 to 2020. The most fluctuating parameters estimated in the DEPM have been the location and extent of the spawning area and the average female weight. In the last few years the eggs were distributed near the coast, whereas in the first few years they showed a more oceanic distribution. The average female weight has fallen from 30 g in the 1990s to 11 g in the last few years. In the present study, we analysed the relationship of the location and extent of spawning areas with female size and abundancy in E. ringens from northern Chile. According to the results, periods of high abundancy of eggs are positively correlated with larger females that spawn in more oceanic zones and to the south, expanding the spatial egg distribution and increasing the egg density. By contrast, in years with low abundance of eggs, the spawning was located north and towards the coast, with a smaller spawning area and smaller female size.
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智利北部青鳉产卵区的扩张和收缩
许多研究都考虑了林根斑马鱼繁殖的时间模式,但很少注意到繁殖的空间模式(产卵区),它在位置(地理位置)和范围(阳性站覆盖的面积)上都表现出很大的变化,没有一个令人满意的解释。沿着智利海岸,每日产蛋法(DEPM)已经使用了好几年,用于估计智利北部龙根鲷种群的产卵生物量,从1992年到2020年进行了24次调查。DEPM中波动最大的参数是产卵区域的位置和范围以及雌鱼的平均体重。在过去的几年里,这些卵分布在海岸附近,而在最初的几年里,它们显示出更多的海洋分布。女性的平均体重从20世纪90年代的30克下降到最近几年的11克。在本研究中,我们分析了产自智利北部的黄颡鱼产卵区域的位置和范围与雌鱼大小和丰度的关系。结果表明,卵丰度高的时期与较大的雌鱼在更多的海洋区域和向南产卵呈正相关,扩大了卵的空间分布,增加了卵密度。相比之下,在卵丰度低的年份,产卵地点位于北部和海岸,产卵面积较小,雌性体型较小。
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来源期刊
Scientia Marina
Scientia Marina 生物-海洋与淡水生物学
CiteScore
2.10
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Scientia Marina is the successor to Investigación Pesquera, a journal of marine sciences published since 1955 by the Institut de Ciències del Mar de Barcelona (CSIC). Scientia Marina is included in the Science Citation Index since 1998 and publishes original papers, reviews and comments concerning research in the following fields: Marine Biology and Ecology, Fisheries and Fisheries Ecology, Systematics, Faunistics and Marine Biogeography, Physical Oceanography, Chemical Oceanography, and Marine Geology. Emphasis is placed on articles of an interdisciplinary nature and of general interest.
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