Negative impact of freeze–thaw cycles on the survival of tardigrades
Zawierucha, K., Vecchi, M., Takeuchi, N., Ono, M., & Calhim, S. (2023). Negative impact of freeze–thaw cycles on the survival of tardigrades. Ecological Indicators, 154, Article 110460. https://doi.org/10.1016/j.ecolind.2023.110460
Julkaistu sarjassa
Ecological IndicatorsPäivämäärä
2023Tekijänoikeudet
© 2023 the Authors
Global warming effects in temperate and polar regions include higher average temperatures and a decrease in snow cover, which together lead to an increase in the number of freeze–thaw cycles (FTC). These changes could affect the fitness of both terrestrial and aquatic species. In this study, we tested how tardigrades, ubiquitous microscopic invertebrates, face FTC. Tardigrades are amongst the most resistant animals to unfavorable conditions, including long and deep freezing periods, and are an emerging model group for invertebrate ecology and evolution. We used 12 populations of tardigrades, representing different families within order Parachela, inhabiting different ecosystems (glaciers, snow, terrestrial, aquatic), found in various substrates (mosses, sediments in lakes, cryoconite on glaciers, and snow), and originating from different latitudes and altitudes. We estimated the number of cycles required to kill 50% of individuals and tested for its association with ecological characteristics of the natural habitat (e.g., number of months with predicted FTC), while accounting for phylogeny. The most resistant tardigrades to FTC were the ones from mountain areas and glaciers. The estimated number of cycles required to kill 50% of individuals was the highest for mountainous species inhabiting rock pools and cryoconite holes on glaciers (30 and 14 FTC, respectively). Tardigrades from lowlands were the most sensitive to changes, with 50% of individuals dying after three FTC, while lacustrine and subtropical tardigrades required only one FTC to reach 50% mortality. Our study shows that the response to recurrent freezing stress is taxon dependent and related to the local environmental conditions. The predicted increase of FTC cycles will negatively impact tardigrade populations. Considering the abundance and various trophic roles of tardigrades, reduction in population sizes or the disappearance of some fragile species could affect the functioning of both aquatic and terrestrial ecosystems. Tardigrades are candidate indicators of how freeze–thaw cycles impact ubiquitous microscopic metazoans with similar physiological capabilities.
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Julkaisija
ElsevierISSN Hae Julkaisufoorumista
1470-160XAsiasanat
Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/183717154
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Suomen AkatemiaRahoitusohjelmat(t)
Akatemiatutkijan tutkimuskulut, SALisätietoja rahoituksesta
These studies were supported within the DARWIN project financed by the National Agency of Academic Exchange in Poland (Bekker program no. PPN/BEK/2020/1/00321) for KZ, by the JSPS KAKENHI (19H01143 and 22H03731) for NT and MO, and the Academy of Finland Fellowship (#314219 and #335759) for SC and MV.Lisenssi
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