Effects of temperature and interspecific competition on population fitness of free-living marine nematodes

Global average temperature, frequency of temperature extremes and amplitude of daily fluctuations are all expected to change under prospected scenarios of climate change. The amplitudes of temperature variation and the ability of species to tolerate thermal stress are crucial for species fitness and...

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Autores principales:	Anna-Maria Vafeiadou, Tom Moens
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Population fitness Plasticity Interspecific interactions Thermal stress Taxis Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/dbb4dadc70034fa39b99567a60a60aeb
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spelling	oai:doaj.org-article:dbb4dadc70034fa39b99567a60a60aeb2021-12-01T04:30:45ZEffects of temperature and interspecific competition on population fitness of free-living marine nematodes1470-160X10.1016/j.ecolind.2020.106958https://doaj.org/article/dbb4dadc70034fa39b99567a60a60aeb2021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20308979https://doaj.org/toc/1470-160XGlobal average temperature, frequency of temperature extremes and amplitude of daily fluctuations are all expected to change under prospected scenarios of climate change. The amplitudes of temperature variation and the ability of species to tolerate thermal stress are crucial for species fitness and survival in rapidly changing environments. Small differences in the life histories of species or in their responses to environmental variation can differentiate their niche and support coexistence; hence, even small changes in environmental conditions may not only affect the fitness of individual species, but also the outcome of species interactions. In the present experiments, the free-living nematode species Halomonhystera disjuncta is used as a model organism to investigate physiological and behavioural responses to environmental change in an ecological context of species interactions. We examine population fitness and food-taxis behaviour of H. disjuncta under different temperature regimes in the presence and absence of a competing species. Both stressors – temperature and competition – affected life-history traits and population development of the model species in different ways; the nematode populations exhibited higher fitness under a daily fluctuating temperature regime, but a lower fitness under an increased constant temperature. The presence of a competing species had a negative effect on its population fitness and food-finding behaviour at all temperature regimes, yet the most pronounced effects of competition were observed at the highest temperatures, suggesting that interspecific interactions such as competition may weaken a species’ intrinsic tolerance to environmental change. Thermal stress thus not only affects species fitness but also species interactions, which in turn will likely have repercussions for species coexistence.Anna-Maria VafeiadouTom MoensElsevierarticlePopulation fitnessPlasticityInterspecific interactionsThermal stressTaxisEcologyQH540-549.5ENEcological Indicators, Vol 120, Iss , Pp 106958- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Population fitness Plasticity Interspecific interactions Thermal stress Taxis Ecology QH540-549.5
spellingShingle	Population fitness Plasticity Interspecific interactions Thermal stress Taxis Ecology QH540-549.5 Anna-Maria Vafeiadou Tom Moens Effects of temperature and interspecific competition on population fitness of free-living marine nematodes
description	Global average temperature, frequency of temperature extremes and amplitude of daily fluctuations are all expected to change under prospected scenarios of climate change. The amplitudes of temperature variation and the ability of species to tolerate thermal stress are crucial for species fitness and survival in rapidly changing environments. Small differences in the life histories of species or in their responses to environmental variation can differentiate their niche and support coexistence; hence, even small changes in environmental conditions may not only affect the fitness of individual species, but also the outcome of species interactions. In the present experiments, the free-living nematode species Halomonhystera disjuncta is used as a model organism to investigate physiological and behavioural responses to environmental change in an ecological context of species interactions. We examine population fitness and food-taxis behaviour of H. disjuncta under different temperature regimes in the presence and absence of a competing species. Both stressors – temperature and competition – affected life-history traits and population development of the model species in different ways; the nematode populations exhibited higher fitness under a daily fluctuating temperature regime, but a lower fitness under an increased constant temperature. The presence of a competing species had a negative effect on its population fitness and food-finding behaviour at all temperature regimes, yet the most pronounced effects of competition were observed at the highest temperatures, suggesting that interspecific interactions such as competition may weaken a species’ intrinsic tolerance to environmental change. Thermal stress thus not only affects species fitness but also species interactions, which in turn will likely have repercussions for species coexistence.
format	article
author	Anna-Maria Vafeiadou Tom Moens
author_facet	Anna-Maria Vafeiadou Tom Moens
author_sort	Anna-Maria Vafeiadou
title	Effects of temperature and interspecific competition on population fitness of free-living marine nematodes
title_short	Effects of temperature and interspecific competition on population fitness of free-living marine nematodes
title_full	Effects of temperature and interspecific competition on population fitness of free-living marine nematodes
title_fullStr	Effects of temperature and interspecific competition on population fitness of free-living marine nematodes
title_full_unstemmed	Effects of temperature and interspecific competition on population fitness of free-living marine nematodes
title_sort	effects of temperature and interspecific competition on population fitness of free-living marine nematodes
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/dbb4dadc70034fa39b99567a60a60aeb
work_keys_str_mv	AT annamariavafeiadou effectsoftemperatureandinterspecificcompetitiononpopulationfitnessoffreelivingmarinenematodes AT tommoens effectsoftemperatureandinterspecificcompetitiononpopulationfitnessoffreelivingmarinenematodes
_version_	1718405873367252992

Effects of temperature and interspecific competition on population fitness of free-living marine nematodes

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