Effects of a broad range of experimental temperatures on the population growth and body-size of five species of free-living nematodes

Majdi, Nabil; Traunspurger, Walter; Fueser, Hendrik; Gansfort, Birgit; Laffaille, Pascal; Maire, Anthony

doi:10.1016/j.jtherbio.2018.12.010

Cited by 24 publications

(19 citation statements)

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“…Therefore, we generally validated our assumption that it is justified to refer to thermal preference instead of thermal acclimation in our further interpretation of the results. Additionally, this result confirms the adaptive nature of body size linked to temperature at the interclonal level along with the previous interspecific patterns found for three species representing the Brachionus plicatilis cryptic species complex (Walczyńska and Serra 2014) and five species of free-living nematodes (Majdi et al 2019).…”

Section: Discussionsupporting

confidence: 89%

“…Our largest clone, also acclimated to intermediate temperature, exhibited the poorest performance of all (though best at the lowest temperature as relative to other clones). Regarding nematodes, the largest species showed notably poor growth in all other regimes compared with the other four species, although it had the highest fitness in the coldest temperature (Majdi et al 2019). These results are in contrast to previous reports (Geister and Fischer 2007; Kingsolver and Huey 2008) and show that larger sizes are not always better.…”

Section: Discussionmentioning

confidence: 99%

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Clonal thermal preferences affect the strength of the temperature-size rule

Stuczynska

Sobczyk

Fiałkowska

et al. 2020

Preprint

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21Genetically similar organisms act as a powerful study system for the subtle differences in various 22 aspects of life histories. The issue of trade-offs among traits is of special interest. We used six 23 parthenogenetic rotifer clones previously exposed to different thermal laboratory conditions. 24 Interclonal differences in female body size were examined in common garden conditions. We 25 estimated the population growth rate and strength of the size-to-temperature response across four 26 thermal regimes. We tested hypotheses on the existence of the relationships between (i) thermal 27 acclimation and species body size, (ii) thermal specialization and fitness and (iii) thermal 28 specialization and strength of the temperature-size rule. Positive verification of (i) would make it 29 justifiable to refer the other investigated traits to thermal preference and, further, to thermal 30 specialization. Addressing the issues (ii) and (iii) is our pioneering contribution to the question on 31 the strength of size-to-temperature response as differing across life strategies. We hypothesized 32 that this plastic response may be affected by the level of thermal specialization and that this 33 pattern may be traded off with the temperature-dependent potential for population growth rate. 34Additionally, we investigated the differences in reproductive strategy (number of eggs laid by a 35 female and female lifetime duration) in one temperature assumed optimal, which acts as an 36 important supplement to the general clonal life strategy. We confirmed that the thermal 37 acclimation of a clone is related to body size, with clones acclimated to higher temperatures 38 being smaller. We also found that warm-acclimated clones have a narrower thermal range (= are 39 more specialized), and that the temperature-size rule is stronger in rotifers acclimated to 40 intermediate thermal conditions than in specialists. Our results contribute into the issue of trade-41 offs between generalist and specialist strategies, in the context of plastic body size respone to 42 different temperatures.43 3 specialization 45 46 Optimal allocation theory states that living organisms optimize their strategies of the allocation of 48 limited resources among the functions associated with maintenance, repair and reproduction. Any 49 given set of abiotic and biotic conditions provides a unique, optimal strategy, and trade-offs 50 among life history traits are at the base of such strategies (Cody ). The pattern of limited resources causing the traits to 52 trade is complex and troublesome with regard to straightforward inferences and conclusions 53 (Acerenza 2016; Lailvaux and Husak 2017; Roff and Fairbairn 2007). Going a step further, 54DeWitt (2016) stressed the importance of including not only trait means but also the shape (i.e., 55 skew) of phenotypic plasticity in studies on life-history optimization in ecological contexts. 56According to the author, the strength of phenotype distribution across environments should be 57 optimized by means of nat...

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Clonal thermal preferences affect the strength of the temperature-size rule

Stuczynska

Sobczyk

Fiałkowska

et al. 2020

Preprint

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“…This is especially true in systems (like the MDV) where limited biodiversity and strong abiotic gradients can make interactions more detectable. Future research should verify the nature of the associations highlighted in this paper, using in vitro studies; higher resolution molecular work (e.g., primer amplicon studies and deeper metagenome sequencing) that can improve taxonomic resolution from family and genus to species or even populations; controls for small-scale abiotic and spatial filtering effects (e.g., soil heterogeneity within a sample site and vertical soil structure); and culture-based assessments of environmental tolerances and feeding preferences [ 56 , 94 , 95 ]. Achieving these goals will lay the groundwork for characterizing the links between ecosystem functioning and biodiversity for an entire microbial soil community [ 16 ], and will facilitate an improved understanding of ecological processes within and beyond the MDV system.…”

Section: Discussionmentioning

confidence: 99%

Phagotrophic Protists and Their Associates: Evidence for Preferential Grazing in an Abiotically Driven Soil Ecosystem

et al. 2021

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The complex relationship between ecosystem function and soil food web structure is governed by species interactions, many of which remain unmapped. Phagotrophic protists structure soil food webs by grazing the microbiome, yet their involvement in intraguild competition, susceptibility to predator diversity, and grazing preferences are only vaguely known. These species-dependent interactions are contextualized by adjacent biotic and abiotic processes, and thus obfuscated by typically high soil biodiversity. Such questions may be investigated in the McMurdo Dry Valleys (MDV) of Antarctica because the physical environment strongly filters biodiversity and simplifies the influence of abiotic factors. To detect the potential interactions in the MDV, we analyzed the co-occurrence among shotgun metagenome sequences for associations suggestive of intraguild competition, predation, and preferential grazing. In order to control for confounding abiotic drivers, we tested co-occurrence patterns against various climatic and edaphic factors. Non-random co-occurrence between phagotrophic protists and other soil fauna was biotically driven, but we found no support for competition or predation. However, protists predominately associated with Proteobacteria and avoided Actinobacteria, suggesting grazing preferences were modulated by bacterial cell-wall structure and growth rate. Our study provides a critical starting-point for mapping protist interactions in native soils and highlights key trends for future targeted molecular and culture-based approaches.

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“…The same difficulties were due to the scarcity of studies related to the "locomotion and substrate relation" trait which has been investigated almost exclusively in nematodes, rotifers, some crustaceans and gastrotrichs e.g., [55,56]. Majdi et al [21] suggested using laboratory populations with mesocosms to study certain traits that otherwise would not be directly observable in the field e.g., [57,58].The results obtained also indicate that the traits receiving the least interest are respiration and thermal preference. These traits, on the other hand, require an indepth study, especially considering the future climate change scenarios that will dramatically affect the coastal areas of lakes [59,60].…”

Section: Discussionmentioning

confidence: 99%

An Overview of Studies on Meiofaunal Traits of the Littoral Zone of Lakes

Cifoni

Boggero

Galassi

et al. 2021

Water

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We carried out an overview of the studies on the traits of the meiofauna of the littoral zone of lakes to investigate the question relating to the Raunkiaeran shortfall (lack of knowledge on biological traits). For this purpose, we selected a series of keywords associated with response and effect traits (feeding habits, locomotion and substrate relation, body size, shape and mass, life history, reproductive strategy, respiration and thermal tolerance) and we counted the relative frequency of occurrence in a set of scientific papers retrieved from Web of Science. The results showed that, except for the traits related to diet and feeding habits, the Raunkiaeran shortfall is very pronounced for all meiofaunal taxa of the littoral zone of lakes, especially for those related to soft-bodied organisms. The reason behind this deficiency concerns many aspects ranging from the high taxonomic expertise required to the intrinsic difficulties of observing organisms of such a small size. The relationship with temperature has not been sufficiently explored and formalized in any of the examined traits; this research aspect needs to be rapidly addressed since the prospects of climate change impacts on lake littorals are expected to be particularly severe.

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Effects of a broad range of experimental temperatures on the population growth and body-size of five species of free-living nematodes

Abstract: Majdi N. et al. (2019) Effects of a broad range of experimental temperatures on the population growth and body-size of five species of free-living nematodes.

Cited by 24 publications

References 51 publications

Clonal thermal preferences affect the strength of the temperature-size rule

Clonal thermal preferences affect the strength of the temperature-size rule

Phagotrophic Protists and Their Associates: Evidence for Preferential Grazing in an Abiotically Driven Soil Ecosystem

An Overview of Studies on Meiofaunal Traits of the Littoral Zone of Lakes

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