Environmental effects on abundance and size of harvested bivalve populations in intertidal shellfish grounds

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research Pub Date : 2024-10-22 DOI:10.1016/j.marenvres.2024.106808

José Daniel Cerdeira-Arias , Jaime Otero , Elena Barceló , Guillermo del Río , Aitor Freire , Manuel García , Gloria Portilla , José Antonio Santiago , Anxo Mena Rodríguez , Miguel Ángel Nombela , Xosé Antón Álvarez-Salgado

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Abstract

Clams, razor clams and cockle are intertidal bivalve species collected on foot in the shellfish grounds of the Rías Altas (NW Spain). Spatio-temporal distribution of these bivalves are typically at the expenses of the environmental conditions of the region; however, the responses to the abiotic conditions are poorly understood. Using data from 6 species (Ruditapes decussatus, Venerupis corrugata, Ruditapes philippinarum, Cerastoderam edule, Donax trunculus and Solen marginatus) sampled in 51 intertidal shellfish grounds during 2007 and 2008, we characterized the influence of the environment (temperature, salinity, nutrient salts, suspended organic matter, or sediment granulometry and composition) on the distribution and size of these species through a comparative statistical analysis. Shellfish grounds were grouped according to their sediment and water characteristics revealing a land-ocean gradient and the influence of the geological imprint that separates bivalve grounds from West to East. Statistical models showed that R. decussatus, V. corrugata and R. philippinarum together with C. edule were more abundant in sites combining a strong marine influence with organic-rich finer sediments. However, each of those species also had different environmental niches mostly related to their particular sediment affinities, the proximity to the river mouth, and their physiological tolerances to temperature and salinity. D. trunculus was only found in outer exposed shellfish grounds, while S. marginatus abundance increased in muddy sediments. River distance was a sound descriptor of individual shell length and length variability with contrasting effects on the different species. Furthermore, slopes of length-weight relationships were steeper in autumn than in spring, and this allometry tended to be more positive in sites located closer to the rivers’ mouth, which had a higher organic matter C/N ratio. Overall, harvested intertidal bivalves had identifiable environmental preferences that influence their spatial distribution in abundance, body size, and allometric growth.

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环境对潮间带贝类产地收获双壳贝类种群数量和大小的影响。

文蛤、蛏子和蛤蜊是在 Rías Altas（西班牙西北部）贝类产地徒步采集的潮间带双壳贝类。这些双壳贝类的时空分布通常受该地区环境条件的影响；然而，人们对其对非生物条件的反应却知之甚少。利用 2007 年和 2008 年期间在 51 个潮间带贝类产卵场采集的 6 个物种（Ruditapes decussatus、Venerupis corrugata、Ruditapes philippinarum、Cerastoderam edule、Donax trunculus 和 Solen marginatus）的数据，我们通过比较统计分析，确定了环境（温度、盐度、营养盐、悬浮有机物或沉积物颗粒度和成分）对这些物种的分布和大小的影响。根据沉积物和水的特征对贝类产地进行了分组，发现了陆地-海洋梯度以及将双壳贝类产地从西向东分开的地质印迹的影响。统计模型显示，R. decussatus、V. corrugata和R. philippinarum以及C. edule在受海洋影响较大、沉积物有机质丰富的地点更为丰富。不过，这些物种也有不同的环境优势，主要与其特定的沉积物亲缘关系、离河口的远近以及对温度和盐度的生理耐受性有关。D. trunculus 只出现在外露的贝类产地，而 S. marginatus 在泥质沉积物中数量增加。河流距离是个体贝壳长度和长度变化的可靠描述指标，对不同物种的影响截然不同。此外，长度-重量关系的斜率在秋季比在春季陡峭，而在离河口较近的地点，这种异构关系往往更积极，因为河口的有机物 C/N 比值较高。总体而言，收获的潮间带双壳贝类对环境有可识别的偏好，这影响了它们在丰度、体型和异速生长方面的空间分布。

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来源期刊

Marine environmental research 环境科学-毒理学

CiteScore

5.90

自引率

3.00%

发文量

217

审稿时长

46 days

期刊介绍： Marine Environmental Research publishes original research papers on chemical, physical, and biological interactions in the oceans and coastal waters. The journal serves as a forum for new information on biology, chemistry, and toxicology and syntheses that advance understanding of marine environmental processes. Submission of multidisciplinary studies is encouraged. Studies that utilize experimental approaches to clarify the roles of anthropogenic and natural causes of changes in marine ecosystems are especially welcome, as are those studies that represent new developments of a theoretical or conceptual aspect of marine science. All papers published in this journal are reviewed by qualified peers prior to acceptance and publication. Examples of topics considered to be appropriate for the journal include, but are not limited to, the following: – The extent, persistence, and consequences of change and the recovery from such change in natural marine systems – The biochemical, physiological, and ecological consequences of contaminants to marine organisms and ecosystems – The biogeochemistry of naturally occurring and anthropogenic substances – Models that describe and predict the above processes – Monitoring studies, to the extent that their results provide new information on functional processes – Methodological papers describing improved quantitative techniques for the marine sciences.