Behavioural avoidance of acidified water by juveniles of four commercial fish and prawn species with migratory life stages
Behavioural avoidance of acidified water by juveniles of four commercial fish and prawn species with migratory life stages
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DOI：
10.3354/meps285193
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发表时间：
2005-01-01
影响因子：
2.5
通讯作者：
Kroon, FJ
中科院分区：
文献类型：
--
作者：
Kroon, FJ
酸性硫酸盐土壤排放物的急性暴露对水生生态系统的影响已有充分的文献记载。然而，对长期酸性硫酸盐排放的长期影响知之甚少。这种排放可能对移动造成障碍，可能影响鱼类和无脊椎动物物种，包括商业物种的迁移。避免这种排放的成年人可能会影响产卵迁移，而类似的行为，由少年可能会影响迁移到苗圃栖息地。因此，鱼类进入排放点以外重要生境的能力可能会降低，对种群规模产生潜在影响。本研究探讨了3种经济鱼类和1种经济对虾幼鱼是否存在酸性硫酸盐回避行为。10个个体组成的群体在实验室河流的成对通道中同时选择2种不同的水质，即偏好-回避情况。所有物种避免酸化水，表明慢性酸性硫酸盐排放有可能影响这些物种在该领域的迁移。在这些实验中避免的pH值水平完全在自然系统所表现出的幅度内。因此，长期酸性硫酸盐排放可能对商业和休闲渔业产生不利影响。
Impacts on aquatic ecosystems resulting from acute exposure to acid sulfate soil discharge are well documented. However, less is known about the long-term impacts of chronic acid sulfate discharge. Such discharge may create barriers to movement, potentially affecting migration of fish and invertebrate species, including commercial species. Avoidance of such discharges by adults may affect spawning migrations, while similar behaviour by juveniles may affect migration to nursery habitats. As a result, the capacity of fish to access important habitats beyond the discharge point may be reduced with potential consequences for stock size. This study examined the possible existence of acid sulfate avoidance behaviour in juveniles of 3 commercial fish species and 1 commercial prawn species. Schools of 10 individuals were given a simultaneous choice between 2 different water qualities in paired channels of a laboratory stream, i.e. preference -avoidance situation. All species avoided acidified water, indicating that chronic acid sulfate discharge has the potential to affect migration of these species in the field. The pH levels avoided in these experiments were well within the magnitude exhibited by natural systems. Thus, chronic acid sulfate discharge in the field could have a detrimental impact on commercial and recreational fisheries.