‘Optimal thermal range’ in ectotherms: Defining criteria for tests of the temperature-size-rule

Walczyńska, Aleksandra; Kiełbasa, Anna; Sobczyk, Mateusz

doi:10.1016/j.jtherbio.2016.06.006

Cited by 32 publications

(41 citation statements)

References 45 publications

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“…In light of the previous studies on A. hemprichi body size response to temperature, the lack of differences in body size obtained in the present study might be caused by the chosen thermal range, which was too close to the approximate optimal value, estimated to be 21 °C (Walczyńska et al 2016). Body size significantly depended on cell size ( N = 124, p = 0.0012, r 2 = 0.0823; Fig.…”

Section: Resultscontrasting

confidence: 56%

“…3). This result has important implications: the temperature of 24 °C is above the optimum regarding A. hemprichi performance measured to be 21 °C by Walczyńska et al (2016), but such conditions seem to be limiting only under hypoxia and not hyperoxia. The joint limiting conditions of high temperature and hypoxia were previously observed during examination of fecundity in the L. inermis rotifer (Walczyńska et al 2015a).…”

Section: Resultsmentioning

confidence: 81%

“…We repeated the experiment using a non-eutelic annelid Aeolosoma hemprichi Ehrenberg 1828 on the body size effect on the population growth under low/high-temperature/oxygen conditions, which we have previously conducted on an eutelic rotifer Lecane inermis Bryce, 1892 (Walczyńska et al 2015a). Both L. inermis (Kiełbasa et al 2014; Walczyńska et al 2016) and A. hemprichi (Walczyńska et al 2016) were previously reported as decreasing in size with increasing temperature, following the TSR, while exposed to wide temperature range. In both a previous study on rotifers and in the current study on A. hemprichi , we performed a two-step study: in the first step, we aimed at differentiating the organisms’ body size by culturing them at different temperatures, while in the second stage, we examined the fitness (fecundity in rotifers and population growth rate in annelids) of the second generation of “small” and “large” individuals at combinations of low and high levels of two factors, temperature and oxygen (Fig.…”

Section: Introductionmentioning

confidence: 99%

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What may a fussy creature reveal about body/cell size integration under stressful conditions?

2018

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There is a growing amount of empirical evidence on the important role of cell size in body size adjustment in ambient or changing conditions. Though the adaptive significance of their correspondence is well understood and demonstrated, the proximate mechanisms are still in a phase of speculation. We made interesting observations on body/cell size adjustment under stressful conditions during an experiment designed for another purpose. We found that the strength of the body/cell size match is condition-dependent. Specifically, it is stronger under more stressful conditions, and it changes depending on exposure to lower temperature vs. exposure to higher temperature. The question whether these observations are of limiting or adaptive character remains open; yet, according to our results, both versions are possible but may differ in response to stress caused by too low vs. too high temperatures. Our results suggest that testing the hypotheses on body/cell size match may be a promising study system for the recent scientific dispute on the evolutionary meaning of developmental noise as opposed to phenotypic plasticity.

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Section: Resultscontrasting

confidence: 56%

Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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What may a fussy creature reveal about body/cell size integration under stressful conditions?

2018

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“…specialist or cold‐ vs . warm‐preferring) may cause the wrong conclusions and the existing TSR might not be detected (Walczyńska et al., 2016). In the case of this study, the effect of different preferences is not distinguishable from the effect of sample size (the reliability of each effect‐size estimation increases with increasing sample size) and the influence of the strategy associated with other species characteristic, such as life form, which in the case of diatoms may be motile/attached/floating and solitary/colonial.…”

Section: Discussionmentioning

confidence: 99%

The underestimated role of temperature–oxygen relationship in large‐scale studies on size‐to‐temperature response

Walczyńska

Sobczyk

2017

Ecology and Evolution

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The observation that ectotherm size decreases with increasing temperature (temperature‐size rule; TSR) has been widely supported. This phenomenon intrigues researchers because neither its adaptive role nor the conditions under which it is realized are well defined. In light of recent theoretical and empirical studies, oxygen availability is an important candidate for understanding the adaptive role behind TSR. However, this hypothesis is still undervalued in TSR studies at the geographical level. We reanalyzed previously published data about the TSR pattern in diatoms sampled from Icelandic geothermal streams, which concluded that diatoms were an exception to the TSR. Our goal was to incorporate oxygen as a factor in the analysis and to examine whether this approach would change the results. Specifically, we expected that the strength of size response to cold temperatures would be different than the strength of response to hot temperatures, where the oxygen limitation is strongest. By conducting a regression analysis for size response at the community level, we found that diatoms from cold, well‐oxygenated streams showed no size‐to‐temperature response, those from intermediate temperature and oxygen conditions showed reverse TSR, and diatoms from warm, poorly oxygenated streams showed significant TSR. We also distinguished the roles of oxygen and nutrition in TSR. Oxygen is a driving factor, while nutrition is an important factor that should be controlled for. Our results show that if the geographical or global patterns of TSR are to be understood, oxygen should be included in the studies. This argument is important especially for predicting the size response of ectotherms facing climate warming.

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“…The minimum temperature at which L. inermis can sustain a positive growth rate is 8 °C, but this has only been observed in one of the four clones of this species (Fiałkowska et al 2011). The optimal temperature at which this rotifer has exhibited its highest growth rate is 30 °C (Walczyńska et al 2016), so at lower temperatures, they require relatively old sludge to reach the density at which they can limit the overproliferation of filaments. Additionally, our previous research showed that an initial L. inermis density of 100 ind/mL resulted in bulking control (Fiałkowska and Pajdak-Stós 2008).…”

Section: Introductionmentioning

confidence: 99%

Foam-forming bacteria in activated sludge effectively reduced by rotifers in laboratory- and real-scale wastewater treatment plant experiments

Pajdak‐Stós

Kocerba‐Soroka

Fyda

et al. 2017

Environ Sci Pollut Res

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Lecane inermis rotifers were shown to diminish sludge bulking due to their ability to ingest the filamentous bacteria in activated sludge. To determine if rotifers are also able to control branched actinomycetes, we investigated three other Lecane species (Monogononta). In a week-long experiment, only Lecane tenuiseta significantly reduced the density of Microthrix parvicella and Type 0092 filaments, but in a 2-week experiment, actinomycetes were significantly reduced by most of the tested monogonont rotifers: L. inermis, Lecane decipiens and Lecane pyriformis. Rotifers L. inermis originating from the mass culture were artificially introduced into real-scale wastewater treatment plant (WWTP) in two series. The WWTP was monitored for 1 year. Rotifer inoculation resulted in diminishing of M. parvicella and actinomycete abundance. The experiments showed that different species of rotifers vary in their effectiveness at limiting various types of filamentous organisms. This is the first report demonstrating that one of the most troublesome bacteria, branched actinomycetes, which cause heavy foaming in bioreactors, can be controlled by rotifers. Knowledge of the consumers of filamentous bacteria that inhabit activated sludge could help WWTP operators overcome bulking and foaming through environmentally friendly methods.

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‘Optimal thermal range’ in ectotherms: Defining criteria for tests of the temperature-size-rule

Cited by 32 publications

References 45 publications

What may a fussy creature reveal about body/cell size integration under stressful conditions?

What may a fussy creature reveal about body/cell size integration under stressful conditions?

The underestimated role of temperature–oxygen relationship in large‐scale studies on size‐to‐temperature response

Foam-forming bacteria in activated sludge effectively reduced by rotifers in laboratory- and real-scale wastewater treatment plant experiments

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