Seasonal differences in amounts of oviposition habitat and egg-laying by caddisflies in rivers with regulated versus unregulated flows

IF 2.8 2区生物学 Q2 ECOLOGY

Freshwater Biology Pub Date : 2024-03-10 DOI:10.1111/fwb.14236

Handoko Wahjudi, William D. Bovill, Andrew J. Brooks, Barbara J. Downes

引用次数: 0

Abstract

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有调节流量与无调节流量河流中蝶类产卵栖息地和产卵量的季节性差异

很少有研究考虑到溪流中底栖昆虫产卵的时空变化。然而，这种变化会对后代的数量和分布以及生命周期的后续阶段产生持久影响。对于需要特定产卵栖息地的物种，如突出水面的岩石（突岩，ER），产卵栖息地的密度会影响某些物种的底栖卵甚至幼虫的密度。对这些物种而言，水位的变化会改变礁石的时空分布，并影响卵的密度，甚至可能影响幼虫的密度。在水坝下方，水流状态的改变可能会改变ER的时空分布。在这项研究中，我们测试了河流调节是否会改变产卵栖息地的可用性，以及与未调节河流相比是否会改变产卵的物候学。在澳大利亚东南部两条受管制河流（Murrumbidgee河、Tumut河）和三条未受管制河流（Goobarragandra河、Goodradigbee河、Micalong河）的多个地点，我们在3年时间里（2019-2021年）按季节调查了五种笛鲷科（Hydrobiosidae）ER和卵块的密度。我们还在两个季节使用灯光诱捕器采集了成虫样本。在春季和夏季，两条受管制河流的大流量淹没了所有岩石，而在秋季和冬季，小流量泄洪使所有（穆伦比奇河）或大部分（图穆特河）地点的岩石搁浅在水线以上。在墨伦比奇河，尽管成虫捕获量相对较大，但在任何日期都没有观察到ER或卵块。在图穆特河（Tumut River）上，一个地点两次观察到低密度的ER和卵块，都发生在无管制河流产卵量较低的季节（冬季和秋季）。在未受管制的河流中，ER 和卵块（5 种，4 属）出现在所有地点，但冬季的密度低于其他季节。在产卵高峰期，每个地点的卵块密度与ER密度关系不大。2019 年夏季，两条无管制河流中的 ER 被成片的藻类和沉积物覆盖，似乎阻碍了产卵，因为此时未观察到卵块。在管制河流中，季节性水流会淹没（夏季、秋季）或搁浅（冬季、春季）全部或大部分 ER，从而阻碍产卵。与此相反，在未受管制的河流中，ER全年都可以产卵，除了当ER被藻类和沉积物覆盖时，产卵全年都会发生。在不同季节，当地的卵块密度可能受限于怀孕雌鱼的数量，而不是ER的数量，这与之前的研究有所不同。确定繁殖障碍对于了解自然和改变系统中种群数量的变化至关重要。我们在水坝下游观察到的产卵失败现象提出了一个新的假设，即为什么一些昆虫物种没有出现在因灌溉而调节水流的河道中。成片的藻类可能同样阻碍了低流量条件下河流的繁殖，但这一假设仍未得到验证。

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来源期刊

Freshwater Biology 生物-海洋与淡水生物学

CiteScore

5.90

自引率

3.70%

发文量

162

审稿时长

2 months

期刊介绍： Freshwater Biology publishes papers on all aspects of the ecology of inland waters, including rivers and lakes, ground waters, flood plains and other freshwater wetlands. We include studies of micro-organisms, algae, macrophytes, invertebrates, fish and other vertebrates, as well as those concerning whole systems and related physical and chemical aspects of the environment, provided that they have clear biological relevance. Studies may focus at any level in the ecological hierarchy from physiological ecology and animal behaviour, through population dynamics and evolutionary genetics, to community interactions, biogeography and ecosystem functioning. They may also be at any scale: from microhabitat to landscape, and continental to global. Preference is given to research, whether meta-analytical, experimental, theoretical or descriptive, highlighting causal (ecological) mechanisms from which clearly stated hypotheses are derived. Manuscripts with an experimental or conceptual flavour are particularly welcome, as are those or which integrate laboratory and field work, and studies from less well researched areas of the world. Priority is given to submissions that are likely to interest a wide range of readers. We encourage submission of papers well grounded in ecological theory that deal with issues related to the conservation and management of inland waters. Papers interpreting fundamental research in a way that makes clear its applied, strategic or socio-economic relevance are also welcome. Review articles (FRESHWATER BIOLOGY REVIEWS) and discussion papers (OPINION) are also invited: these enable authors to publish high-quality material outside the constraints of standard research papers.