Small hydropower plants lead to higher litter breakdown rates in by-passed sections than in impounded reaches

Rezende, Renan de Souza; Cararo, Emanuel Rampanelli; Chimello, Valeria; Lima‐Rezende, Cássia Alves; Moretto, Yara; Gonçalves, José Francisco

doi:10.1007/s00027-022-00926-8

Cited by 7 publications

(2 citation statements)

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“…This behavior can be attributed to the fact that high competitive pressure can impede population growth (Verdú et al 2009; Dormann et al 2018) and, consequently, the ecological processes performed by these organisms (Rezende et al 2021(Rezende et al , 2023. For example, high competitive pressure within speci c feeding trophic groups, such as shredders, can lead to reduced leaf litter consumption (Rezende et al 2015;Cararo et al 2023b), consequently slowing down nutrient cycling in aquatic environments (Rezende et al 2021(Rezende et al , 2023, mainly in gallery riparian forest (Rezende et al 2014;Gonçalves et al 2017). This highlights the importance of comprehending the dynamics of competitive interactions in shaping ecosystem processes and functionality (Rezende et al 2015;Cararo et al 2023b).…”

Section: Introductionmentioning

confidence: 99%

“…Another crucial aspect is dispersal, as some insects tend to migrate to alleviate competitive pressure (Baines et al 2014; Durães et al 2016). This behavior can be attributed to the fact that high competitive pressure can impede population growth (Verdú et al 2009; Dormann et al 2018) and, consequently, the ecological processes performed by these organisms (Rezende et al 2021(Rezende et al , 2023. For example, high competitive pressure within speci c feeding trophic groups, such as shredders, can lead to reduced leaf litter consumption (Rezende et al 2015;Cararo et al 2023b), consequently slowing down nutrient cycling in aquatic environments (Rezende et al 2021(Rezende et al , 2023, mainly in gallery riparian forest (Rezende et al 2014;Gonçalves et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Effect of intraspecific and interspecific competition on the facultative and obligatory shredders forage activity in subtropical system

Durigon,

Cararo,

Lima-Rezende

et al. 2024

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While the significance of competition for resources in shaping the structure of aquatic ecosystems is well recognized, its specific effects on the dynamics of allochthonous matter in streams have received limited attention and remain poorly understood, mainly between interspecific and intraspecific competition. In this study, we investigated the effects of interspecific and intraspecific competition on the shredder organisms Phylloicus and Aegla in leaf litter banks. The impact of competition was assessed through experimental treatments: i - Phylloicus competition-free; ii - Aeglacompetition-free; iii - intraspecific competition within Aegla; iv - intraspecific competition within Phylloicus; v - interspecific competition. In the competition-free treatment, a single organism was placed in a 2-L microcosm, whereas in the competitive pressure treatments, two organisms were placed in a 4-L microcosm, with a 0.05-mm mesh separating them. Our results revealed that interspecific competition had a greater impact on Phylloicus, while intraspecific competition exerted a stronger influence on Aegla. Phylloicusexhibited higher efficiency as a shredder compared to Aegla, which can be attributed to its broader feeding range and unique strategies in leaf litter utilization. The presence of potential competitors led to a reduction in consumption rates in Phylloicus, indicating its sensitivity to competition. Moreover, Aegla's predatory behavior and cannibalism may intensified intraspecific competition within the species. The findings highlight the importance of competition in shaping the feeding activity of shredder organisms in leaf litter banks, which ultimately affects nutrient cycling in aquatic ecosystems.

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