Untitled

Rawer-Jost, Claudia; Kappus, B.; Böhmer, Jürgen; Jansen, Wolfgang; Rahmann, H.

doi:10.1023/a:1003594726288

Cited by 14 publications

(6 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lehmann ( 1967 ), Rawer‐Jost et al. ( 1998 ). Even under the most conservative scenario based upon the lowest densities of the target taxa observed in our study, more than one million individuals were successfully labelled.…”

Section: Discussionmentioning

confidence: 99%

Stable isotopes (¹⁵N) facilitate non‐invasive labelling of large quantities of macroinvertebrates across different species and feeding types

Enss,

Nachev,

Jochmann

et al. 2024

Ecology and Evolution

View full text Add to dashboard Cite

While macroinvertebrate dispersal operates at the individual level, predictions of their dispersal capabilities often rely on indirect proxies rather than direct measurements. To gain insight into the dispersal of individual specimens, it is crucial to mark (label) and capture individuals. Isotopic enrichment with 15N is a non‐invasive method with the potential of labelling large quantities of macroinvertebrates. While the analysis of 15N is widely utilised in food web studies, knowledge on the specific utility of isotopic enrichment with 15N for mass labelling of macroinvertebrate individuals across different taxa and feeding types is limited. Previous studies have focused on single species and feeding types, leaving gaps in our understanding of the broader applicability of this method. Therefore, this study aimed to test and compare isotopic mass enrichment across several macroinvertebrate taxa and feeding types. We released 15NH4Cl at five stream reaches in North‐Rhine Westphalia, Germany, and successfully enriched 12 distinct macroinvertebrate taxa (Crustacea and Insecta). Significant enrichment was achieved in active and passive filter feeders, grazers, shredders and predators, and predominantly showed positive correlations with the enrichment of the taxa's main food sources phytobenthos and particulate organic matter. Enrichment levels rose rapidly and peaked at distances between 50 m and 300 m downstream of the isotopic inlet; significant enrichment occurred up to 2000 m downstream of the isotopic inlet in all feeding types. Macroinvertebrate density estimates on the stream bottom averaged to a total of approximately 3.4 million labelled individuals of the 12 investigated taxa, thus showing the high potential of isotopic (15N) enrichment as a non‐invasive method applicable for mass labelling across different macroinvertebrate feeding types. Hence, isotopic enrichment can greatly assist the analysis of macroinvertebrate dispersal through mark‐and‐recapture experiments, as it allows to measure the movement at the level of individual specimens.

show abstract

Section: Discussionmentioning

confidence: 99%

Stable isotopes (¹⁵N) facilitate non‐invasive labelling of large quantities of macroinvertebrates across different species and feeding types

Enss,

Nachev,

Jochmann

et al. 2024

Ecology and Evolution

View full text Add to dashboard Cite

show abstract

“…Second, comparable to fish larvae (Lechner, Keckeis, & Humphries, 2016; Nagel et al, 2021), macroinvertebrates are known to colonize new habitats via downstream directed drift processes from upstream regions (Mackay, 1992). Third, upstream directed movements, for example, through fish bypasses, have been documented for some taxa (Rawer‐Jost et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…Whilst most insects have adult flying stages facilitating their movement over dams and weirs, such structures can act as important barriers for the movement of less mobile taxa such as molluscs, crustacean, and paurometabolous insects. In such cases, fish passes can provide important corridors for upstream movements as it has been documented for gammarids (Rawer‐Jost, Kappus, Böhmer, Jansen, & Rahmann, 1998). Gustafsson, Österling, Skurdal, Schneider, and Calles (2013) provided early evidence that a high degree of habitat heterogeneity in nature‐like constructed fish passes facilitates the colonization by macroinvertebrates from the main river.…”

Section: Introductionmentioning

confidence: 98%

The overlooked contribution of a fish bypass channel to the density and diversity of macroinvertebrate drift in a heavily modified river system

Nagel

Mizerakis

Pander

et al. 2022

River Research & Apps

View full text Add to dashboard Cite

The freshwater biodiversity decline affects all trophic levels, prompting restoration efforts. While habitat restoration for fish is well-studied, habitat restoration to benefit other sensitive taxa such as Ephemeroptera, Plecoptera, and Trichoptera (EPT) remains poor. Consequently, this study investigated the habitat function of a man-made naturelike bypass system for EPT taxa in a highly modified alpine river with several drift feeding fishes. Spatially and temporally distributed drift samples were used to test the hypotheses that the bypass (a) enhances the density of drifting individuals compared to the main river and (b) diversifies drift assemblages compared to the main river. Mean drift density of EPT taxa was lowest in the main stem of the river close to the inlet of the bypass (38.24 Ind./100m 3 ) and significantly increased toward the downstream direction of the bypass, near the outflow (61.49 Ind./100m 3 ). In addition, drift assemblages significantly changed from the main stem to the bypass and the number of EPT taxa detected more than doubled (main stem: 16 genera; last site in the bypass: 33 genera), indicating that the bypass can provide a macroinvertebrate source to the main stem. Seasonal and diel drift patterns were similar to those observed in natural streams, underpinning the finding that nature-like bypass systems can feature an EPT community similar to natural rivers.This study aligns with a growing body of evidence on the habitat function of nature-like bypass systems for aquatic taxa and highlights the importance of this restoration measure beyond the aspect of solely restoring habitat connectivity.

show abstract

“…Barriers include dams, weirs, and culverts, as well as less obvious impediments, such as sedimentation, excessive vegetation growth, or habitat fragmentation caused by land-use changes. Removing or modifying these barriers can help restore the natural movement patterns of macroinvertebrates between habitats, enabling them to access the necessary resources for feeding, reproduction, and refuge, as well as promoting gene flow and reducing the risk of population isolation (Rawer-Jost et al 1998). The removal of barriers may involve the physical dismantling of structures, such as dams or weirs, or the modification of existing structures to allow for the passage of macroinvertebrates (Mahan et al 2021;Noatch & Suski 2012).…”

Section: Connectivity Restorationmentioning

confidence: 99%

Macroinvertebrate conservation in river ecosystems: Challenges, restoration strategies, and integrated management approaches

Lim,

2023

Entomological Research

View full text Add to dashboard Cite

River ecosystems face growing threats from human‐induced stressors, resulting in habitat degradation and biodiversity loss. Crucial to these ecosystems, macroinvertebrates maintain river health and functioning. In this review, we examine the challenges confronting macroinvertebrates, explore restoration strategies and management approaches, and shed light on knowledge gaps and future research directions. Habitat degradation, water pollution, climate change, and invasive species are discussed as key challenges. Various restoration strategies, such as in‐stream habitat restoration, flow regime restoration, riparian zone restoration, and connectivity restoration, are evaluated for macroinvertebrate conservation. Integrated catchment management, adaptive management, community‐based management, monitoring, and policy integration are highlighted as essential management approaches, and knowledge gaps in long‐term monitoring, innovative restoration techniques, climate change resilience, and policy incorporation are identified as areas calling for further research. Ultimately, a proactive, adaptable, and cooperative approach to river management will ensure macroinvertebrate conservation and sustainable river ecosystems.

show abstract

Untitled

Cited by 14 publications

References 29 publications

Stable isotopes (¹⁵N) facilitate non‐invasive labelling of large quantities of macroinvertebrates across different species and feeding types

Stable isotopes (¹⁵N) facilitate non‐invasive labelling of large quantities of macroinvertebrates across different species and feeding types

The overlooked contribution of a fish bypass channel to the density and diversity of macroinvertebrate drift in a heavily modified river system

Macroinvertebrate conservation in river ecosystems: Challenges, restoration strategies, and integrated management approaches

Contact Info

Product

Resources

About

Untitled

Cited by 14 publications

References 29 publications

Stable isotopes (15N) facilitate non‐invasive labelling of large quantities of macroinvertebrates across different species and feeding types

Stable isotopes (15N) facilitate non‐invasive labelling of large quantities of macroinvertebrates across different species and feeding types

The overlooked contribution of a fish bypass channel to the density and diversity of macroinvertebrate drift in a heavily modified river system

Macroinvertebrate conservation in river ecosystems: Challenges, restoration strategies, and integrated management approaches

Contact Info

Product

Resources

About

Stable isotopes (¹⁵N) facilitate non‐invasive labelling of large quantities of macroinvertebrates across different species and feeding types

Stable isotopes (¹⁵N) facilitate non‐invasive labelling of large quantities of macroinvertebrates across different species and feeding types