Climate tracking by freshwater fishes suggests that fish diversity in temperate lakes may be increasingly threatened by climate warming

Wu, Thomas; Imrit, Mohammad Arshad; Nia, Zahra Movahedi; Kong, Jude Dzevela; Woolway, R. Iestyn; Sharma, Sapna

doi:10.1111/ddi.13664

Cited by 7 publications

(2 citation statements)

References 122 publications

(202 reference statements)

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“…Moreover, warmer autumn temperatures in eutrophic lakes could lead to algal blooms occurring much later in the year 73 . It is important to note, however, that the ecophysiological responses expected from these simulated alterations in seasonal temperature will likely differ across lakes (e.g., eutrophic vs oligotrophic systems and deep vs shallow), and will also depend on attributes such as species adaptive capacity, the ability of aquatic species to migrate 74,75 , and the disruption of ecological interactions 76 . However, when considering these ecological responses of the studied lakes to shifts in the timing of seasonal temperatures, it is also important to consider that there may be some bias in the results given the definition of the averaging window.…”

Section: Discussionmentioning

confidence: 99%

The pace of shifting seasons in lakes

Woolway

2023

Nat Commun

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Lake ecosystems are vulnerable to seasonal thermal cues, with subtle alterations in the timing of seasonal temperatures having a dramatic influence on aquatic species. Here, a measure of seasonal change in temperature is used to describe the pace of shifting seasons in lakes. Since 1980 spring and summer temperatures in Northern Hemisphere lakes have arrived earlier (2.0- and 4.3-days decade−1, respectively), whilst the arrival of autumn has been delayed (1.5-days decade−1) and the summer season lengthened (5.6-days decade−1). This century, under a high-greenhouse-gas-emission scenario, current spring and summer temperatures will arrive even earlier (3.3- and 8.3-days decade−1, respectively), autumn temperatures will arrive later (3.1-days decade−1), and the summer season will lengthen further (12.1-days decade−1). These seasonal alterations will be much slower under a low-greenhouse-gas-emission scenario. Changes in seasonal temperatures will benefit some species, by prolonging the growing season, but negatively impact others, by leading to phenological mismatches in critical activities.

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Section: Discussionmentioning

confidence: 99%

The pace of shifting seasons in lakes

Woolway

2023

Nat Commun

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“…Coldwater fishes typically require cold, well oxygenated waters to thrive (Scott and Crossman, 1973;Magnuson et al, 1979). In response to water temperature warming, coldwater fishes have been increasingly lost from lakes where water temperatures have begun to exceed the thermal tolerances of coldwater fishes (Sharma et al, 2011;Van Zuiden and Sharma, 2016;Wu et al, 2022). Conversely, coolwater fishes were expanding into our study lakes over the 50-year period.…”

Section: How Has Beta Diversity Changed Over Time?mentioning

confidence: 99%

Increasing fish biodiversity in high elevation Albertan lakes in response to global environmental change over the past 50 years

Wu,

Nguyen,

Imrit

et al. 2024

Front. Ecol. Evol.

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IntroductionThe diversity of freshwater fishes is threatened by multiple environmental stressors, including climate change, alterations in land use, and introduction of non-native species. However, the quantification of temporal biodiversity in freshwater communities is limited. Here, we asked: i) how has alpha (species richness), beta (changes in freshwater species composition), and gamma diversity (total species diversity in a landscape) changed over time for lakes over a 50 year period?; and ii) What are the climatic, land use, and lake morphological drivers associated with higher diversity?MethodsWe assembled a database of fish species occurrence from 20 lakes across subalpine and alpine regions in Alberta from 1970-2019, in addition to lake morphological, climatic, and land use characteristics of the watersheds. ResultsWe observed an overall increase in alpha, beta, and gamma diversity from the 1970s to 2009s. However, all measures of diversity declined from 2010-2019. We found that more lakes and species assemblages were influenced by species gains, rather than species losses (with the exception of the last decade of sampling). DiscussionGenerally, we found that coolwater species were expanding and coldwater fishes were being lost throughout our study lakes. We highlight temporal heterogeneity in fish biodiversity responses to substantial environmental pressures in this region.

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Evaluation of genetic consequences of stocking on the southern‐margin populations of white‐spotted charr

Masuda,

Shimono,

Kishi

et al. 2024

Ecology and Evolution

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Coldwater‐adapted freshwater fishes, especially their populations along warm‐range margins, are most vulnerable to the climate oscillations associated with global warming. Stocking is a major strategy for avoiding the extinction of these species. However, while stocking can reverse the decline of isolated populations, it may also result in a loss of genetic diversity in the native local population due to the introgressive replacement of hatchery genes. To plan an adequate strategy for conserving locally adapted populations, the genetic impacts of stocking on native lineages should be evaluated from small river branches to wide‐ranging drainage areas. We investigated the population genetic structure of white‐spotted charr (Salvelinus leucomaenis) within its southern range (Lake Biwa basin, Japan). By applying genome‐wide SNP analysis to the population's genetic structure, we assessed the extent of genetic introgression resulting from stocking. White‐spotted charr in the Lake Biwa watershed constitutes a distinctive genetic group, within which apparent genetic differentiation was observed. The hatchery‐reared fish line commonly used for supplementation stocking in the catchment was discernable from the native population, enabling us to analyze genetic introgression across the entire drainage area. Admixed individuals resulting from hatchery introgression were observed in most of the stocked sites that showed relatively high heterozygosity and nucleotide diversity. However, their genetic differentiation was much lower than that of native populations. The supplementation history as well as the road availability contributed substantially to the introgression of hatchery genes. Populations with the native genetic structure remained in the upstream regions of the tested rivers. However, their heterozygosity and nucleotide diversity were low when compared with that of the populations with hatchery supplementation. Our results shed light on the genetic impacts of stocking on isolated native populations and suggest that conventional supplementation methods cannot preserve a unique biodiversity in the distribution margin.

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Climate tracking by freshwater fishes suggests that fish diversity in temperate lakes may be increasingly threatened by climate warming

Cited by 7 publications

References 122 publications

The pace of shifting seasons in lakes

The pace of shifting seasons in lakes

Increasing fish biodiversity in high elevation Albertan lakes in response to global environmental change over the past 50 years

Evaluation of genetic consequences of stocking on the southern‐margin populations of white‐spotted charr

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