Weighted stream temperature tolerance index is insensitive to changes in stream fish composition

IF 1.7 4区 环境科学与生态学 Q3 ECOLOGY Freshwater Science Pub Date : 2022-09-01 DOI:10.1086/721539
McKayla Jarvie, Donald A. Jackson
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引用次数: 0

Abstract

Freshwater fish species require and compete for specific water temperatures and thermal regimes to maximize physiological and behavioral processes; however, the thermal habitats on which freshwater fish rely are being modified by local human activities and global climate change. Water temperature measurements that are often used to determine thermal regimes allow predictions of species occurrence in the absence of assemblage surveys. Methods that connect assemblage composition with temperature provide additional information that otherwise is lost when temperature is measured alone. Using stream fish assemblage data collected over 2 decades from various biomonitoring programs in southern Ontario, Canada, we tracked site-level changes in stream fish assemblage composition from numerous watersheds. We also assessed the utility of using a weighted species association tolerance index with respect to water temperature (WSATI-WT) that weights the abundance of each species in an assemblage by their thermal preference to generate an assemblage temperature preference. We tracked temporal changes in assemblage temperature preferences and used bootstrapping to assess the effects of sampling variability on this index. Fish assemblage composition changed over time in all watersheds, but these changes had differential effects on WSATI-WT values. Temporal changes in WSATI-WT values ranged from −9.43 to 5.04°C, of which 68% were negative and 32% positive. These changes imply that, over time, the thermal regime of some sites changed, but bootstrapping showed that WSATI-WT estimates could differ by ≤10°C (mean = 1.57°C) due to sampling variability alone. Examination of the variation in bootstrapped values relative to species composition indicates that uncommon or underrepresented species that have atypical thermal preferences relative to the other species within individual samples may have a large influence on WSATI-WT values. We must develop robust and resilient methods of tracking assemblage responses to warming temperatures if we hope to manage watersheds and species that are sensitive to warming temperatures.
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加权溪流温度耐受指数对溪流鱼类组成的变化不敏感
淡水鱼类物种需要并竞争特定的水温和热状态,以最大限度地提高生理和行为过程;然而,当地人类活动和全球气候变化正在改变淡水鱼赖以生存的热栖息地。通常用于确定热状态的水温测量允许在没有组合调查的情况下预测物种的出现。将组合组成与温度联系起来的方法提供了额外的信息,否则当单独测量温度时就会丢失这些信息。利用20多年来从加拿大安大略省南部的各种生物监测项目中收集的溪流鱼类群落数据,我们跟踪了许多流域溪流鱼类群落组成的现场水平变化。我们还评估了使用相对于水温的加权物种关联耐受指数(WSATI-WT)的效用,该指数根据热偏好对组合中每个物种的丰度进行加权,以产生组合温度偏好。我们跟踪了组合温度偏好的时间变化,并使用自举来评估采样可变性对该指数的影响。所有流域的鱼类群落组成都随着时间的推移而变化,但这些变化对WSATI-WT值有不同的影响。WSATI-WT值的时间变化范围为-9.43至5.04°C,其中68%为阴性,32%为阳性。这些变化意味着,随着时间的推移,一些地点的热状态发生了变化,但自举表明,仅由于采样可变性,WSATI-WT估计值可能相差≤10°C(平均值=1.57°C)。对自举值相对于物种组成的变化的检查表明,相对于单个样品中的其他物种具有非典型热偏好的不常见或代表性不足的物种可能对WSATI-WT值有很大影响。如果我们希望管理对变暖温度敏感的流域和物种,我们必须开发出稳健和有弹性的方法来跟踪群落对变暖温度的反应。
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来源期刊
Freshwater Science
Freshwater Science ECOLOGY-MARINE & FRESHWATER BIOLOGY
CiteScore
4.10
自引率
0.00%
发文量
49
审稿时长
6-12 weeks
期刊介绍: Freshwater Science (FWS) publishes articles that advance understanding and environmental stewardship of all types of inland aquatic ecosystems (lakes, rivers, streams, reservoirs, subterranean, and estuaries) and ecosystems at the interface between aquatic and terrestrial habitats (wetlands, riparian areas, and floodplains). The journal regularly features papers on a wide range of topics, including physical, chemical, and biological properties of lentic and lotic habitats; ecosystem processes; structure and dynamics of populations, communities, and ecosystems; ecology, systematics, and genetics of freshwater organisms, from bacteria to vertebrates; linkages between freshwater and other ecosystems and between freshwater ecology and other aquatic sciences; bioassessment, conservation, and restoration; environmental management; and new or novel methods for basic or applied research.
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