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Biodiversity Assessment and Geographical Affinities of Discards in Clam Fisheries in the Atlantic–Mediterranean Transition (Northern Alboran Sea)
Thalassas: An International Journal of Marine Sciences ( IF 0.7 ) Pub Date : 2021-08-07 , DOI: 10.1007/s41208-021-00303-6
J. Urra 1 , P. Marina 1 , M. Lozano 1 , J. M. Serna 1 , J. Baro 1 , J. L. Rueda 1 , T. García 1 , A. Rojas García 2 , E. León Duarte 2 , H. Gallardo-Roldán 3 , B. Orue Montaner 4 , A. Garrido 5 , A. J. Ibáñez Yuste 5 , A. Terrón-Sigler 5
Affiliation  

This study focused on the assessment and quantification of discards generated by clam fisheries along the northern Alboran Sea (western Mediterranean). Discard samples (n = 278) were collected throughout one year on board nine commercial vessels. A total of 129 species were identified, mostly represented by molluscs (72 spp.), arthropods (20 spp.) and echinoderms (12 spp.). Molluscs dominated in terms of abundance (67.5%) and biomass (94.2%). The superfamily Paguroidea (i.e. hermit crabs), together with undersized target individuals, were the most abundant taxa. The abundance and biomass of discards displayed significant maximum values in winter, which could be partly related to biotic factors including population dynamics of some dominant species. Multivariate analyses indicated the presence of different assemblages related to the targeted bivalve species, reflecting the transition between a fine surface-sands biocoenosis exposed to wave action and a well-sorted fine sands biocoenosis below 5 m depth. Analysis of biogeographical affinities showed that most discarded species (73.2%) have an extensive Atlantic range, whereas 7.1% have a restricted distribution within the Mediterranean. The presence of subtropical species highlights the uniqueness of this area (the Atlantic–Mediterranean transition) in European seas. The usefulness of discard analysis for biodiversity assessment is discussed.



中文翻译:

大西洋-地中海过渡期(北奥尔博兰海)蛤渔业中丢弃物的生物多样性评估和地理亲和力

这项研究的重点是评估和量化阿尔博兰海北部(地中海西部)捕捞蛤蜊的丢弃物。丢弃样本 ( n = 278) 在 9 艘商船上收集了整整一年。共鉴定出 129 个物种,主要以软体动物(72 种)、节肢动物(20 种)和棘皮动物(12 种)为代表。软体动物在丰度(67.5%)和生物量(94.2%)方面占主导地位。超科Paguroidea(即寄居蟹),连同体型较小的目标个体,是最丰富的分类群。丢弃物的丰度和生物量在冬季显示出显着的最大值,这可能部分与生物因素有关,包括一些优势物种的种群动态。多变量分析表明存在与目标双壳类物种相关的不同组合,反映了暴露于波浪作用的细表面砂生物群落与 5 m 深度以下分类良好的细砂生物群落之间的过渡。生物地理亲缘性分析表明,大多数被丢弃的物种 (73.2%) 具有广泛的大西洋范围,而 7.1% 的物种在地中海范围内分布有限。亚热带物种的存在凸显了该地区(大西洋-地中海过渡区)在欧洲海域的独特性。讨论了丢弃物分析对生物多样性评估的有用性。

更新日期:2021-08-09
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