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<p>Cellular demands for phosphorus (P) in ectotherms are hypothesised to increase at low temperatures to maintain the rate of protein synthesis. Additionally, consumers can exhibit luxury uptake, i.e. the storing of essential nutrients for use when they are scarce. However, studies on P&#xa0;content in cold-adapted invertebrates have been limited to marine and freshwater zooplankton, and data on P&#xa0;content in glacier and proglacial microinvertebrate consumers are scarce. We report the first comparison of mass-specific P&#xa0;content (% per dry weight) in tardigrades and rotifers, two common extremophilic microinvertebrate consumers, using a novel X-ray emission approach. Our scientific objectives were twofold: (1) to compare P&#xa0;content in glacier consumers with their counterparts from ponds in the glacier forefield, which represents a habitat with a higher average temperature, and (2) to determine the mass-specific P&#xa0;content of the common and well-identifiable glacier tardigrade <i>Fontourion glaciale</i> between glaciers with different P concentrations. We found that glacier tardigrades had a high P&#xa0;content comparable to that of P&#xa0;rich and fast-growing invertebrates. Overall, glacier consumers had higher P&#xa0;content than consumers from the forefield pond; however, only one forefield pond was investigated, and further analyses are needed to verify our assumptions. Analysis of the tardigrade species <i>F. glaciale</i> revealed a low mass-specific P&#xa0;content in cryoconite that has a high available P and the opposite at some glaciers. Since tardigrades and rotifers are abundant limno-terrestrial consumers in polar regions, are exposed to low temperatures and have a short active season, investigation of their elemental content and stoichiometry is greatly needed, not least to model the impact of glacier melt on nutrient cycling in downstream habitats.</p>

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Phosphorus in cryospheric microinvertebrates: a first insight into glacier and non-glacier tardigrades and rotifers by particle induced X-ray emission (PIXE)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月6日

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  • Tereza Novotná Jaroměřská,
  • Vladimír Havránek,
  • Jakub Trubač,
  • Miloslav Devetter,
  • Krzysztof Zawierucha,
  • Oleksandr Romanenko,
  • Václav Tejnecký,
  • Jaroslav Kukla,
  • Marie Fayadová,
  • Lenka Vondrovicová,
  • Dag Olav Hessen

摘要

Cellular demands for phosphorus (P) in ectotherms are hypothesised to increase at low temperatures to maintain the rate of protein synthesis. Additionally, consumers can exhibit luxury uptake, i.e. the storing of essential nutrients for use when they are scarce. However, studies on P content in cold-adapted invertebrates have been limited to marine and freshwater zooplankton, and data on P content in glacier and proglacial microinvertebrate consumers are scarce. We report the first comparison of mass-specific P content (% per dry weight) in tardigrades and rotifers, two common extremophilic microinvertebrate consumers, using a novel X-ray emission approach. Our scientific objectives were twofold: (1) to compare P content in glacier consumers with their counterparts from ponds in the glacier forefield, which represents a habitat with a higher average temperature, and (2) to determine the mass-specific P content of the common and well-identifiable glacier tardigrade Fontourion glaciale between glaciers with different P concentrations. We found that glacier tardigrades had a high P content comparable to that of P rich and fast-growing invertebrates. Overall, glacier consumers had higher P content than consumers from the forefield pond; however, only one forefield pond was investigated, and further analyses are needed to verify our assumptions. Analysis of the tardigrade species F. glaciale revealed a low mass-specific P content in cryoconite that has a high available P and the opposite at some glaciers. Since tardigrades and rotifers are abundant limno-terrestrial consumers in polar regions, are exposed to low temperatures and have a short active season, investigation of their elemental content and stoichiometry is greatly needed, not least to model the impact of glacier melt on nutrient cycling in downstream habitats.