信号小龙虾Pacifastacus leniusculus (Dana, 1852)(甲壳纲,十足目)在内格罗河(西班牙西北部萨莫拉)威胁着Margaritifera Margaritifera Linnaeus, 1758 (Bivalvia, Unionoida)的未来。

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
J. Morales
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引用次数: 0

摘要

我们研究了信号小龙虾在2019年至2022年夏季内格罗河(西班牙萨莫拉)Margaritifera种群中的发病率。捕食率被评估为与洪水和河流水文有关的死亡因素。自2002年以来,这些小龙虾被困在一小块高珍珠贻贝密度的土地上,并自2019年以来每年夏天收集,在此期间,它们的丰度增加了(三年内增加了65%)。同时,我们数着被洪水冲到砾石河岸上的贝壳。2019年至2022年期间,洪水的发生率保持稳定(占死亡率的10.3%至19.4%),而在河底,由于捕食,珍珠贻贝的死亡率从2.7%上升到43.3%。在2022年旱季期间,从该地块收集了29只最近死亡的珍珠贻贝,这些贻贝的贝壳边缘被小龙虾广泛咬伤。这些贝壳只在露出砾石上方的轮廓上被咬过,这就排除了这些痕迹是小龙虾啃食死亡标本造成的可能性。低强度的捕集对小龙虾的数量几乎没有影响,从第二年开始,控制区域的小龙虾数量已经恢复。
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The signal crayfish Pacifastacus leniusculus (Dana, 1852) (Crustacea, Decapoda) is threatening the near future of Margaritifera margaritifera Linnaeus, 1758 (Bivalvia, Unionoida) in the Negro River (NW Zamora, Spain)
We studied the incidence of the signal crayfish on a population of Margaritifera margaritifera in the Negro River (Zamora, Spain) during the summers of 2019 to 2022. The incidence of predation was assessed as a mortality factor in relation to floods and the hydrology of the river. The crayfish were trapped in a small plot of high pearl mussels density monitored since 2002, and collected each summer since 2019, during which time their abundance increased (65 % in three years). Simultaneously, we counted the shells carried by the floods to the gravel riverbanks. The incidence of floods was stable between 2019 and 2022 (10.3 % to 19.4 % of mortality), while at the bottom of the river the mortality of pearl mussels increased due to predation from 2.7 % to 43.3 %. During the 2022 dry season, 29 pearl mussels that had recently died and whose shell edges were widely gnawed by crayfishes were collected from the plot. The shells appeared bitten only in the contour exposed above the gravel, ruling out the possibility that the marks could be the effect of the scavenging of dead specimens by the crayfish. Low intensity trapping barely affected the crayfish population, since the following year their abundance in the controlled section had recovered.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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