Ocean conditions influence the quality of recruiting benthic marine invertebrate larvae—Insights from fatty acids

IF 3.8 1区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Pub Date : 2024-09-30 DOI:10.1002/lno.12702
Minna Hiltunen, Michael Thomas, Alan L. Shanks, Aaron W. E. Galloway
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Abstract

Many marine benthic invertebrates have a pelagic life stage, during which larvae need to accumulate enough reserves to complete metamorphosis to a settled benthic juvenile. Currently, very little is known about how ocean conditions affect quality of the larvae. We studied this for three settlement seasons (2017–2019) by collecting returning Dungeness crab (Metacarcinus magister) megalopae at the Oregon coast and analyzing them for fatty acid biomarkers. We found that the larvae are omnivorous and have versatile diets. The daily larval abundance was positively correlated with larval quality. Despite the relatively high day‐to‐day variation, we found pronounced seasonal and inter‐annual differences in the body condition (size and total fatty acid content) and biomarker composition of megalopae. Especially, the early season recruits of 2017 had lower content of lipids and polyunsaturated fatty acids known to be beneficial to crustaceans. This is likely related to lingering effects of the eastern Pacific marine heat wave (2014–2016) on pelagic communities. The larvae were rich in docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) with lower levels in benthic juveniles, indicating an ontogenetic diet shift and likely lower availability of DHA and EPA in the benthic environment. The pulsed megalopa recruitment may provide substantial carbon and lipid inputs to the nearshore ecosystem as a form of pelagic subsidy. Our results reveal that ocean conditions may have an effect on the quality of returning larvae, which likely influence their recruitment performance and early juvenile success, and thus potentially also the population size and commercial catch 4 yr later.
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海洋条件影响底栖海洋无脊椎动物幼体新陈代谢的质量--脂肪酸的启示
许多海洋底栖无脊椎动物都有一个浮游生活阶段,在这一阶段,幼体需要积累足够的储备,以完成变态,成为定居在海底的幼体。目前,人们对海洋条件如何影响幼体质量知之甚少。我们通过在俄勒冈海岸收集回归的邓杰内斯蟹(Metacarcinus magister)巨螯,并分析其脂肪酸生物标志物,在三个沉降季节(2017-2019 年)对此进行了研究。我们发现,幼体是杂食性的,而且食性多样。每天的幼虫数量与幼虫质量呈正相关。尽管日变化相对较大,但我们发现巨齿鲨的身体状况(大小和总脂肪酸含量)和生物标志物组成存在明显的季节性和年际性差异。特别是,2017年的早季新鱼体脂质和多不饱和脂肪酸含量较低,而众所周知,这对甲壳类动物是有益的。这可能与东太平洋海洋热浪(2014-2016年)对浮游群落的持续影响有关。幼体富含二十二碳六烯酸(DHA)和二十碳五烯酸(EPA),而底栖幼体中的含量较低,这表明底栖环境中DHA和EPA的可获得性可能较低。巨桡足类的脉冲式繁殖可能为近岸生态系统提供了大量的碳和脂质输入,是一种浮游补贴形式。我们的研究结果表明,海洋条件可能会对回归幼体的质量产生影响,这可能会影响其招募表现和早期幼体的成功率,从而也可能会影响 4 年后的种群数量和商业渔获量。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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