Evidence of a temperature–oxygen squeeze within floodplain thermal refuge habitats

IF 2.8 2区生物学 Q2 ECOLOGY

Freshwater Biology Pub Date : 2024-06-22 DOI:10.1111/fwb.14294

Hannah Barrett, Stanley Gregory, Jonathan Armstrong

引用次数: 0

Abstract

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洪泛区热庇护栖息地内温度-氧气挤压的证据

湖泊和河口的垂直异质性可能会给适应冷水的鱼类带来温度-氧气挤压，例如上盐层温度过高，而较冷的下盐层缺氧，从而限制鱼类进入金属盐层。在温带洪泛平原河流中，成片的透水栖息地（如凹地）有可能在夏季为冷水鱼类提供热庇护，但这些较小的栖息地是否会对鱼类造成温氧限制却鲜为人知。在这项研究中，我们测量了威拉米特河洪泛平原（美国俄勒冈州）六个冷水凹地的温度和氧气曲线，以确定冷水鱼类沿海切喉鳟（Oncorhynchus clarkii clarkii）在温度和氧气方面的潜在权衡特征。为了评估鱼类对权衡的反应，我们采用了协同方法（针式探针热电偶、手术植入的 iButtons 和外部温度发射无线电标签）监测不同时间尺度的鱼类体温，并将其与温度-深度剖面图进行比较。冷水凹地显示出溶解氧与温度之间的线性关系，温度越低，氧气越少。鱼体温度介于凹槽表面和底部记录的温度之间。这些鱼类选择的深度范围只占凹室可用垂直栖息地的不到 20%。这些结果表明，由低温低水位上升流形成的避难所会产生温度-氧气挤压，鱼类只能利用避难所栖息地的一部分。由于溶解氧数据与水温数据相比非常有限，而且许多凉爽的避难所由可能缺氧的次表层水流提供水源，因此氧气对热避难所使用的限制可能是冷水鱼类气候适应规划的一个盲点。

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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.