Discovery of a new but established population of the guppy in Germany

Bierbach, David; Schutz, Christopher; Weimar, Nils; Alegre, Alessandra Escurra; Francisco, Fritz; Wersing, Serafina; O’Connor, Olivia; Kempkes, Michael; Rose, Udo; Miesen, Friedrich Wilhelm; Habedank, Marie; Jourdan, Jonas; Kabus, Jana; Hof, Delia; Hornung, Simon; Emde, Sebastian; Rueffert, Leon; Lukas, Juliane

doi:10.1101/2022.02.01.478389

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…Anthropogenic global warming may lead to seasonal temperature increases by up to 4°C by 2100, along with an increase in the frequency of localized acute and extreme warming events ( Comte and Olden, 2017 ; Bierbach et al, 2022 preprint). These changes are likely to cause population declines, or even extinction of species that are poorly adapted to cope with these novel environmental conditions ( Pacifici et al, 2015 ; Dai et al, 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Thermal tolerance in an extremophile fish from Mexico is not affected by environmental hypoxia

Pacher,

Hernández-Román,

Juarez-Lopez

et al. 2024

Biology Open

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The thermal ecology of ectotherm animals has gained considerable attention in the face of human-induced climate change. Particularly in aquatic species, the experimental assessment of critical thermal limits (CTmin and CTmax) may help to predict possible effects of global warming on habitat suitability and ultimately species survival. Here we present data on the thermal limits of two endemic and endangered extremophile fish species, inhabiting a geothermally heated and sulfur-rich spring system in southern Mexico: The sulfur molly (Poecilia sulphuraria) and the widemouth gambusia (Gambusia eurystoma). Besides physiological challenges induced by toxic hydrogen sulfide and related severe hypoxia during the day, water temperatures have been previously reported to exceed those of nearby clearwater streams. We now present temperature data for various locations and years in the sulfur spring complex and conducted laboratory thermal tolerance tests (CTmin and CTmax) both under normoxic and severe hypoxic conditions in both species. Average CTmax limits did not differ between species when dissolved oxygen was present. However, critical temperature (CTmax=43.2°C) in P. sulphuraria did not change when tested under hypoxic conditions, while G. eurystoma on average had a lower CTmax when oxygen was absent. Based on this data we calculated both species' thermal safety margins and used a TDT (thermal death time) model framework to relate our experimental data to observed temperatures in the natural habitat. Our findings suggest that both species live near their thermal limits during the annual dry season and are locally already exposed to temperatures above their critical thermal limits. We discuss these findings in the light of possible physiological adaptions of the sulfur-adapted fish species and the anthropogenic threats for this unique system.

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Section: Introductionmentioning

confidence: 99%

Thermal tolerance in an extremophile fish from Mexico is not affected by environmental hypoxia

Pacher,

Hernández-Román,

Juarez-Lopez

et al. 2024

Biology Open

View full text Add to dashboard Cite

show abstract

“…Anthropogenic global warming may lead to seasonal temperature increases by up to 4°C by 2100, along with an increase in the frequency of localized acute and extreme warming events (Comte and Olden 2017, Collins et al 2019, Bierbach et al 2022). These changes are likely to cause population declines, or even extinction of species that are poorly adapted to cope with these novel environmental conditions (Pacifici et al 2015, Dai et al 2022.…”

Section: Introductionmentioning

confidence: 99%

Increased thermal tolerance under anoxic conditions in an extremophile fish from hot sulfur springs in Mexico

Pacher,

Hernández-Román,

Juarez-Lopez

et al. 2023

Preprint

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The thermal ecology of ectotherm animals has gained considerable attention in the face of human induced climate change. Particularly in aquatic species the experimental assessment of critical thermal limits (CTmin and CTmax) may help to predict possible effects of global warming on habitat suitability and ultimately species survival. Here we present data on the thermal limits of two endemic and endangered extremophile fish species, inhabiting a geothermally heated and sulfur-rich spring system in Southern Mexico: The sulfur molly (Poecilia sulphuraria) and the widemouth gambusia (Gambusia eurystoma). Besides physiological challenges induced by toxic hydrogen sulfide and related severe hypoxia during the day, water temperatures have been previously reported to exceed those of nearby clearwater streams. We now present temperature data for various locations and years in the sulphur spring complex and conducted laboratory thermal tolerance tests (CTmin and CTmax) both under normoxic as well as sever hypoxic conditions in both species. Average CTmax limits did not differ between species under normoxic conditions. Surprisingly P. sulphuraria was found to reach a higher critical temperature (CTmax = 43.2 C) when tested under hypoxic conditions, while G. eurystoma on average had a lower CTmax when oxygen was absent. Based on this data we calculated both species thermal safety margins and used a TDT (thermal death time) model framework to relate our experimental data to observed temperatures in the natural habitat. Our findings suggest, that both species live near their thermal limits during the annual dry season and are locally already exposed to temperatures above their critical thermal limits. We discuss these findings in the light of possible physiological adaptions of the sulfur-adapted fish species and the anthropogenic threats for this unique system.

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Invisible invaders: range expansion of feral Neocaridina davidi offers new opportunities for generalist intracellular parasites

Prati,

Grabner,

Hupało

et al. 2024

Biol Invasions

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The release of ornamental pets and associated pathogens outside their native range might directly or indirectly impact the recipient community. In temperate regions, e.g., central Europe, feral freshwater species of tropical and sub-tropical origins are mainly constrained to thermally polluted waters and thermal springs. However, species with high environmental plasticity and reproduction rates, such as the shrimp Neocaridina davidi, may adapt to colder water regimes over time. A widening thermal niche may eventually overcome thermal barriers, further expanding the range and enhancing transmission opportunities for host generalist parasites. This study assesses the observed (field observations) and theoretical (species distribution models) range expansion of N. davidi and associated parasites in Europe. We report three newly established N. davidi populations from thermally polluted waters in central Europe (Germany, Hungary, and Slovakia) and provide further evidence of its range expansion into colder environments. Species distribution models predict thermally suitable habitats in the Mediterranean and a foreseeable expansion into Western Europe and the Balkans by 2050. We confirm the presence of the microsporidian parasite Ecytonucleospora hepatopenaei in feral N. davidi populations across Europe and expand the list of microsporidians found in this host from two to four. Furthermore, we provide the first evidence of parasite spillover from/to the invasive crayfish Procambarus clarkii, suggesting that parasite exchange with native biota might be possible. Such possibility, coupled with an ongoing range expansion of N. davidi bolstered by human-mediated introductions and climate change, will likely exacerbate the impact on native biota.

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Discovery of a new but established population of the guppy in Germany

Cited by 3 publications

References 12 publications

Thermal tolerance in an extremophile fish from Mexico is not affected by environmental hypoxia

Thermal tolerance in an extremophile fish from Mexico is not affected by environmental hypoxia

Increased thermal tolerance under anoxic conditions in an extremophile fish from hot sulfur springs in Mexico

Invisible invaders: range expansion of feral Neocaridina davidi offers new opportunities for generalist intracellular parasites

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