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Factors affecting the seasonal variability of planktonic shrimps (Dendrobranchiata) along an estuary–ocean gradient on the Amazon continental shelf
Journal of the Marine Biological Association of the United Kingdom ( IF 1.2 ) Pub Date : 2021-05-06 , DOI: 10.1017/s0025315421000308
Leiliane Souza da Silva , Danielle Viveiros Cavalcante-Braga , Caio Brito Lourenço , Ralf Schwamborn , Jussara Moretto Martinelli-Lemos

Dendrobranchiata shrimp taxonomic composition and spatial and temporal distribution on the Amazon continental shelf (ACS) were investigated along a transect between the sources of the Amazon and Pará Rivers, encompassing an extension of ~250 km towards the continental slope. Plankton was collected with oblique trawls (200 μm mesh size), and nine taxa were found; 59.4% were larvae (mysis or decapodid stages) and 40.6% were juveniles or adults. Acetes was negatively related to chlorophyll-a and temperature, and Luciferidae were positively correlated with months. This study provides novel information on the density distribution of dendrobranchiate shrimps, thus helping to pave the way to characterize a large-scale, hugely relevant area that is poorly studied. As in other tropical coastal areas, there is here an increase in number of taxa with increased distance from the coast. Luciferidae, Solenoceridae and Penaeidae were the most frequent families whereas Sicyoniidae and Sergestidae had the lowest frequency of occurrence nearer the slope. Despite the low larval density of penaeid shrimps, their presence in all months and at all sampling sites along the ACS proves the importance of this area for shrimps with socioeconomic relevance, as well as its importance as a nursery and growth habitat for dendrobranchiate shrimps.

中文翻译:

影响亚马逊大陆架河口-海洋梯度的浮游虾(Dendrobranchiata)季节变化的因素

沿着亚马逊河和帕拉河源头之间的横断面研究了亚马逊大陆架(ACS)上的Dendrobranchiata虾分类组成和时空分布,包括向大陆坡延伸约250公里。用斜拖网(200 μm目数)收集浮游生物,共发现9个类群;59.4% 为幼虫(糠虾或十足目阶段),40.6% 为幼体或成虫。醋酸酯与叶绿素呈负相关一种和温度,而Luciferidae与月份呈正相关。这项研究提供了有关树突虾密度分布的新信息,从而有助于为描述一个研究很少的大规模、高度相关区域的特征铺平道路。与其他热带沿海地区一样,这里的分类群数量随着与海岸距离的增加而增加。Luciferidae、Solenoceridae 和 Penaeidae 是最常见的科,而 Sicyoniidae 和 Sergestidae 在靠近斜坡的地方发生频率最低。尽管对虾的幼虫密度很低,但它们在所有月份和 ACS 沿线所有采样点的存在证明了该区域对于具有社会经济相关性的虾的重要性,以及它作为树鳃虾的苗圃和生长栖息地的重要性。
更新日期:2021-05-06
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