Macrobenthic invertebrate energy densities and ecological status in freshwater watercourses (Friuli Venezia-Giulia, Northeast Italy)

Bertoli, Marco; Piazza, Gabriele; Pastorino, Paolo; Prearo, Marino; Cozzoli, Francesco; Vignes, Fabio; Basset, Alberto; Pizzul, Elisabetta

doi:10.1007/s10452-021-09840-x

Cited by 7 publications

(3 citation statements)

References 62 publications

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“…Empty stomachs and stomachs with only inorganic material, detritus, and/or vegetation were recorded as empty. We blotted fish diet items dry with a paper towel and individually weighed them to the nearest 0.1 mg. Invertebrates were enumerated, blotted dry, and batch weighed by taxon within individual diets (0.1 mg; Bertoli et al 2021).…”

Section: Walleye Dietsmentioning

confidence: 99%

Importance of a Lake-Wetland Complex for a Resilient Walleye Fishery

Cutler,

Chipps,

Blackwell

et al. 2024

Wetlands

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Wetlands serve as unique habitats that can support high biodiversity. Large-scale loss of wetland habitats can threaten important linkages between lake and wetland habitats that could affect diversity and growth of aquatic organisms. In this study, we compare prey diversity and abundance as well as Walleye (Sander vitreus) diets and condition in a large glacial lake (Lake Kampeska, South Dakota) with a connected wetland to better understand seasonal changes in the benefits provided by each habitat. We examined seasonal differences (spring, summer, and fall) through two years (summer 2021 through fall 2022) between the habitats using prey fish catch per unit effort, richness, Shannon diversity, and Bray–Curtis dissimilarity as well as Walleye relative weight, percent of empty stomachs, diet weight, stomach fullness, diet energy, and diet taxa importance. The prey fish community was more diverse and abundant in the wetland, and Walleye consumed more prey (by weight) in the wetland during all seasons except spring. Wetland reconnection can be a tool for managers to improve water quality while providing seasonal habitat needs for fish. Additionally, the diversity of prey resources provided by wetlands, many of which are unique, support resilience in the face of ecological change. Protection of wetlands may be critical for maintaining healthy and resilient fisheries into the future.

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Section: Walleye Dietsmentioning

confidence: 99%

Importance of a Lake-Wetland Complex for a Resilient Walleye Fishery

Cutler,

Chipps,

Blackwell

et al. 2024

Wetlands

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“…The value of quantifying energy transfer through food webs is well accepted; however, actual measurement via bomb calorimetry is time consuming and requires substantial biomass. As a result, data on energy content of freshwater invertebrate taxa are limited, and encompass few taxa (although see Bertoli et al (2018) and Bertoli et al (2021)). Nonetheless, there is a recognised relationship between organic carbon content and energy density (Salonen et al 1976) that can be used to calculate energy density where certain parameters are known.…”

Section: Introductionmentioning

confidence: 99%

Influence of hydroperiod on aquatic food-web structure and energy production in a floodplain wetland: implications for environmental flow management

Frost,

Mika,

Thompson

et al. 2023

Mar. Freshw. Res.

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Context Environmental water is often used to manage floodplain wetlands that support many taxa, both terrestrial and aquatic. It is important to optimise the managed hydroperiod to maximise the provision of aquatically derived resources from wetlands. Aims To test the hypothesis that increasing hydroperiod affects food-web structure and energy production in floodplain wetlands. Methods Fatty acids and stable isotopes of δ13C and δ15N were used to define food-web structure, and estimate total energy production throughout a managed inundation event in a wetland in the northern Murray–Darling Basin. Key results Food-web complexity increased with an increasing hydroperiod in line with predictable patterns of community assemblage development, before reducing sharply immediately prior to drying. Energy availability increased with an increasing hydroperiod and there was a strong correlation (ρ = 0.669, P = 0.0001) between energy availability and fatty acid concentration, which was in turn related to patterns of taxon occurrence. Conclusions and implications Hydroperiod exerts a strong influence on aquatic invertebrate community trophic dynamics and energy provision. Planned flows should support maturation and stabilisation of the invertebrate community to optimise energy provision to consumers.

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“…Among the communities hosted by these environments, macrobenthic invertebrates have a pivotal role. They cover all trophic roles of consumers [16,17] and constitute a trophic source for other invertebrates, fish, and birds [18]. Macrobenthic invertebrates are well-known bioindicators, often used when monitoring lotic and lentic systems [19][20][21][22], and are currently used in the context of ecological status assessment of surface waters in agreement with the European guidelines provided by the Water Framework Directive 2000/60/EC.…”

Section: Introductionmentioning

confidence: 99%

Biodiversity and Litter Breakdown in a Karstic Freshwater System (Doberdò Lake, Northeast Italy) in Relation to Water Level Fluctuations and Environmental Features

et al. 2022

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The present study reports seasonal data about chemico-physical trends, macrobenthic invertebrates, and Phragmites australis decomposition rates within a karstic freshwater system in the western classic Karst. Results presented herein were compared with those obtained from the same system five years ago. Chemico-physical data showed higher temperatures and lower levels of pH and conductivity than in the past. The macrobenthic invertebrate community varied through the seasons and through the years, though they are dominated by few taxa, such as Asellus and Gammarus. These shredders were the most abundant functional feeding guild, playing a pivotal role in the decomposition of the vegetal organic matter. Decomposition rates k ranged between 0.009 and 0.016 days−1 and varied seasonally. k values were different from those previously reported for the investigated system. Differences are mainly due to changes in water supply, depending on decreasing rainfall regimes and hydrometric levels of the Soča River, which showed lower levels than in the previous study. Changes in water supply altered the fluctuating pulse that is typical of ephemeral karstic lakes, changing the system dynamics. Potential effects of climate change on local scale are also discussed.

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Macrobenthic invertebrate energy densities and ecological status in freshwater watercourses (Friuli Venezia-Giulia, Northeast Italy)

Cited by 7 publications

References 62 publications

Importance of a Lake-Wetland Complex for a Resilient Walleye Fishery

Importance of a Lake-Wetland Complex for a Resilient Walleye Fishery

Influence of hydroperiod on aquatic food-web structure and energy production in a floodplain wetland: implications for environmental flow management

Biodiversity and Litter Breakdown in a Karstic Freshwater System (Doberdò Lake, Northeast Italy) in Relation to Water Level Fluctuations and Environmental Features

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