Sexual dimorphism and the influence of artificial elevated temperatures on body size in the imago of<i>Nemoura trispinosa</i>(Plecoptera: Nemouridae)

Turner, Dorothea; Williams, D. Dudley

doi:10.1080/01650420500336566

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…The higher body mass at the lowest temperature was, however, predicted by the general temperature–size rule. Within a non stressful temperature range, aquatic invertebrates have been reported to have higher body mass when kept at lower than at higher temperature (Rempel & Carter 1987; Atkinson 1995; Hogg et al , 1995; Hogg & Williams 1996; Blanckenhorn 1997; Turner & Williams 2005). There was also a tendency for higher differences in growth rates between litter types at 15 °C (20%) than at 10 °C (10%).…”

Section: Discussionmentioning

confidence: 99%

Effect of increased atmospheric CO₂ on the performance of an aquatic detritivore through changes in water temperature and litter quality

Ferreira

Gonçalves

Godbold

et al. 2010

Global Change Biology

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Cold water woodland streams, where terrestrially derived organic matter fuels aquatic food webs, can be affected by increases in atmospheric CO 2 concentrations, as these are predicted to lead to increases in water temperature and decreases in organic matter quality. In fact, elevated CO 2 (580 ppm) decreased the initial phosphorus concentration of birch litter by 30% compared with litter grown under ambient conditions (380 ppm). Here, we first assessed the effect of differences in litter quality on mass loss, microbial colonization and conditioned litter quality after submersion in a mountain stream for 2 weeks. Leaching did not change the relative differences between litter types, while fungal biomass was two fold higher in elevated litter. We then offered this litter (conditioned ambient and elevated) to a stream detritivore that was kept at 10 and 15 1C to assess the individual and interactive effects of increased temperature and decreased litter quality on invertebrate performance. When given a choice, the detritivore preferred elevated litter, but only at 10 1C. When fed litter types singularly, there was no effect of litter quality on consumption rates; however, the effect of temperature depended on individual size and time of collection. Growth rates were higher in individuals fed ambient litter at 10 1C when compared with individuals fed elevated litter at 15 1C. Mortality did not differ between litter types, but was higher at 15 1C than at 10 1C. Increases in temperature led to alterations in the individual body elemental composition and interacted with litter type. The performance of the detritivore was therefore more affected by increases in temperature than by small decreases in litter quality. However, it seems conceivable that in a future global warming scenario the simultaneous increases in water temperature and decreases in litter quality might affect detritivores performance more than predicted from the effects of both factors considered individually.

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Section: Discussionmentioning

confidence: 99%

Effect of increased atmospheric CO₂ on the performance of an aquatic detritivore through changes in water temperature and litter quality

Ferreira

Gonçalves

Godbold

et al. 2010

Global Change Biology

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“…Invertebrate survival and growth are commonly reported to be affected by Cd (Irving et al, 2003;Krauss et al, 2003;Wilding and Maltby, 2006;Brinkman and Johnston, 2008) and temperature (Turner and Williams, 2005;Ferreira et al, 2010). In our study, these two stressors affected the feeding behaviour of the invertebrate shredder Limnephilus sp.…”

Section: Discussionmentioning

confidence: 54%

Impacts of warming on aquatic decomposers along a gradient of cadmium stress

Batista

Pascoal

Cássio

2012

Environmental Pollution

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We evaluated the effects of cadmium and temperature on plant-litter decomposition by examining diversity and activity of aquatic fungi and leaf consumption by Limnephilus sp., a typical invertebrate shredder of Iberian streams. Freshly fallen leaves were immersed in a stream to allow microbial colonization, and were exposed in microcosms to a gradient of cadmium (≤11 levels, ≤35 mg L(-1)). Microcosms were kept at 15 °C, a temperature typically found in Iberian streams in autumn, and at 21 °C to simulate a warming scenario. The increase in temperature stimulated leaf decomposition by microbes, fungal reproduction and leaf consumption by the shredder. Conversely, increased cadmium concentrations inhibited fungal reproduction and diversity, and leaf consumption by the invertebrate. Cadmium concentration inhibiting 50% of fungal reproduction, microbial decomposition and leaf consumption by the shredder was higher at 15 °C than at 21 °C, suggesting that higher temperatures can lead to increased metal toxicity to aquatic decomposers.

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“…The variation among habitats can affect the population's stability, the degree of interspecific competition, and the fitness for characteristics, which may lead to morphological diversity. For some species, sexual dimorphism may contribute to the discrepancy in the data homogeneity (Turner & Williams 2005). A mixture distribution for each instar stage will represent this heterogeneity of data.…”

Section: Simulation Studymentioning

confidence: 99%

Instar determination by constrained gaussian mixture models according to Dyar’s rule

2022

Preprint

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In this study, gaussian mixture models with constrained parameter spaces are applied to the instar determination of insect species. Finite mixture models are often utilized to classify instars without knowing the instar number. Generally, parsimonious models with fewer free parameters would allow a more efficient estimation if underlying assumptions are valid. This work derives parsimonious gaussian mixture models using a parameter constraint motivated by Dyar's rule. Dyar's rule explains the growth pattern of larvae and nymphs of insects by assuming a constant ratio of head capsule width for every adjacent two development stages. Accordingly, every mean value of log-transformed data in each instar stage is considered a linear function. Two Dyar constants are an intercept and the slope of an instar stage, respectively, in the function. This idea allows estimating two free parameters instead of mean parameters in all instar stages in inferring the instar distribution. Along with this, the homogeneity of variance for every instar can be considered. As a result, four model hypotheses are proposed for each assumption of instar counts depending on whether or not these two parameter constraints are applied. After estimating models, the proposed method uses the ICL criterion to choose the optimal instar inference of models. Then, parametric bootstrap LR tests are applied to decide the most efficient model for parameter constraints given an instar counts inference. The proposed method represents that it can find the correct model settings during the simulation study, where various cases regarding mean parameters and the overlap between two groups are underlain. The result for Meimuna mongolica data shows that all observations are well divided into five instar stages. Parametric bootstrap LR tests also indicate the discrepancy of Dyar's rule in their datasets by selecting a model that does not assume Dyar's rule.

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Sexual dimorphism and the influence of artificial elevated temperatures on body size in the imago ofNemoura trispinosa(Plecoptera: Nemouridae)

Cited by 5 publications

References 29 publications

Effect of increased atmospheric CO₂ on the performance of an aquatic detritivore through changes in water temperature and litter quality

Effect of increased atmospheric CO₂ on the performance of an aquatic detritivore through changes in water temperature and litter quality

Impacts of warming on aquatic decomposers along a gradient of cadmium stress

Instar determination by constrained gaussian mixture models according to Dyar’s rule

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Sexual dimorphism and the influence of artificial elevated temperatures on body size in the imago ofNemoura trispinosa(Plecoptera: Nemouridae)

Cited by 5 publications

References 29 publications

Effect of increased atmospheric CO2 on the performance of an aquatic detritivore through changes in water temperature and litter quality

Effect of increased atmospheric CO2 on the performance of an aquatic detritivore through changes in water temperature and litter quality

Impacts of warming on aquatic decomposers along a gradient of cadmium stress

Instar determination by constrained gaussian mixture models according to Dyar’s rule

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Product

Resources

About

Effect of increased atmospheric CO₂ on the performance of an aquatic detritivore through changes in water temperature and litter quality

Effect of increased atmospheric CO₂ on the performance of an aquatic detritivore through changes in water temperature and litter quality