Variation in stonefly (<i>Nemoura cinerea</i> Retzius) growth and development in response to hydraulic and substrate conditions

Franken, Rob J. M.; Gardeniers, J.J.P.; Beijer, John A. J.; Peeters, E.T.H.M.

doi:10.1899/07-066.1

Cited by 12 publications

(10 citation statements)

References 50 publications

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“…In contrast, the larger crevices associated with the quartz-vein rocks were large enough to shelter macroinvertebrates, including both predatory stoneflies and their baetid prey. Use of larger crevices by stoneflies (Rader & McArthur, 1995;Franken et al, 2008) can produce a highly clumped distribution (Rader & McArthur, 1995), which we also found. The proximity of mayflies and their predators on rocks is consistent with their similar habitat preferences (Peckarsky & Cowan, 1995).…”

Section: Discussionsupporting

confidence: 68%

Shifting effects of rock roughness across a benthic food web

Bergey

Cooper

2015

Hydrobiologia

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Habitat heterogeneity affects the spatial pattern of stream organisms, but it is unclear how broadly heterogeneity affects the distribution of organisms within a food web. Specifically, rougher rocks have greater algal biomass than smoother rocks, and we hypothesized bottom-up food web control of food web structure, in which rougher rocks would also have higher grazer and predator abundance. We surveyed algal biomass and macroinvertebrates on rocks of differing roughness. We also conducted a field experiment to separately examine rock roughness and algal biomass effects by manipulating algal biomass by raking or scrubbing rocks within created rock clusters. Neither the survey nor the experiment strongly supported a bottom-up scenario. Algal biomass increased with rock roughness. Grazing mayfly abundance was distributed evenly among geologic rock types, except for a higher abundance of baetids on rocks with large cavities, where predatory stoneflies were also abundant. In the rock cluster experiment, the moderate raking disturbance produced higher grazer abundance and reduced algal biomass relative to unmanipulated controls. We concluded that fine-scale roughness directly promoted algal biomass, whereas larger-grain roughness (crevices) affected the distribution of the food web components by forming clumped distributions of grazing baetid mayflies and predatory stoneflies.

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Section: Discussionsupporting

confidence: 68%

Shifting effects of rock roughness across a benthic food web

Bergey

Cooper

2015

Hydrobiologia

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“…In many taxonomic groups variability in resource use has been expressed as variability in microhabitat use, including insects (Eterovick et al 1997), fishes (Bouton et al 1997) and frogs (Eterovick & Barros 2003;Eterovick & Barata 2006). Variability in resource use has also been expressed as differential growth or variation in life history traits in plants (Donohue et al 2001) and insects (Franken et al 2008), or as dietary changes in fishes (Vitule et al 2008), to cite just a few. When genotypes contain the information needed to adopt appropriate phenotypes under a range of environmental conditions, divergent selection forces can create polymorphisms, with each morph having its preferred resources (Smith & Skúla-son 1996).…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation of tadpole spatial niches in permanent streams: The roles of predation risk and microhabitat availability

2010

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Phenotypic plasticity can improve fitness in unstable environments and can be expressed in many traits, such as life history attributes, growth and behavioural features. Microhabitat choice can have important consequences for development and survival of aquatic organisms and is expected to vary in response to stimuli, such as predation risk, food availability and temperature. At seasonal sites, microhabitat availability and associated benefits may change from season to season, which might lead to altered patterns of microhabitat use by tadpoles. We investigated this hypothesis in 17 streams from two localities in south-eastern Brazil. We tested whether water level drops significantly during the dry season, whether lower water level results in altered microhabitat availability and whether predation risk changes between seasons, based on predator density. We then tested whether tadpoles change their pattern of microhabitat use, their spatial niche breadth (given by diversity of used microhabitats) and spatial niche overlap (in the case of co-occurring species). We were able to include in our analyses tadpoles of four species of Hylidae, that occurred throughout both seasons. Stream depth decreased in the dry season, but microhabitat availability remained relatively stable in many streams, and predator density did not change significantly. Tadpoles of three out of the four species studied were more abundant during the dry season, which may be an adaptation to adjust time of metamorphosis to the rainy season. Tadpoles changed their patterns of microhabitat use between seasons, although the potential causing factors investigated did not seem to be responsible. Tadpole plasticity in microhabitat use may indicate the existence of selective pressures that vary through time and space and are still not well understood.

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“…Then, a first question regarding our finding of directional selection on body size in L. atacamae should be: why would larger individuals is promoted by selection? Animals that live in aquatic ecosystems are severely constrained by water viscosity, especially small ones (Franken et al, 2008;Dees et al, 2010). Limnocitherid ostracods are commonly detritivores or omnivorous, they dwell in the benthos, where the substratum particle size determines their distribution (Benzie, 1989).…”

Section: Discussionmentioning

confidence: 99%

Viability selection on body size in a non-marine ostracod

et al. 2011

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One of the most important research topics in evolutionary ecology is body size evolution. Actually, several hypotheses have been proposed to explain the many observed patterns-also known as ''rules''-of body size variation in across latitude, temperature, and time. The temperature-size rule (TSR), describes an inverse relationship between body size and temperature. We took advantage of the ''natural laboratory'' that the crustacean populations at the Chilean altiplano offers, to study the TSR in ostracods. We studied three populations of Limnocythere atacamae that are physically separated by several kilometers, and differ mainly by their permanent thermal regime. We found larger individuals in the hotspring compared to the cold ponds. Also, in the hotspring we found a significant quadratic selection coefficient, suggesting stabilizing selection in this population. The fitness profiles showed stabilizing selection in the hotspring, and positive directional selection in the ponds. Our results suggest the existence of an optimal body size above the population means. This optimal size is apparently attained in the hotspring population. Then, natural selection appears to be promoting a shift in the mean phenotype that, for some reason, is not attained in the cold environments. Genetic slippage and population bottleneck would explain this absence of response to selection.

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Variation in stonefly (Nemoura cinerea Retzius) growth and development in response to hydraulic and substrate conditions

Cited by 12 publications

References 50 publications

Shifting effects of rock roughness across a benthic food web

Shifting effects of rock roughness across a benthic food web

Seasonal variation of tadpole spatial niches in permanent streams: The roles of predation risk and microhabitat availability

Viability selection on body size in a non-marine ostracod

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