Effects of fine wood on macroinvertebrate drift in four boreal forest streams

Enefalk, Åsa; Bergman, Eva

doi:10.1007/s10750-015-2423-x

Cited by 7 publications

(6 citation statements)

References 59 publications

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“…In particular, researchers need to consider density dependence in fish populations and the causes of density dependence, such as food availability, habitat quality, flood refuge, drought refuge, and thermal refuge. Also, far more studies have examined the ecological and geomorphic influences of large wood, but the relationships with small wood (<1 m length and 10 cm diameter) have received far less attention (Ward and Aumen, 1986; Enefalk and Bergman, 2016; Galia et al ., 2018). Addressing other gaps in large wood research, such as attention to dynamics and roles of wood on floodplains, can be complicated by the need for cross‐discipline collaboration, such as between terrestrial and stream ecologists.…”

Section: Knowledge Gaps and Future Workmentioning

confidence: 99%

Reflections on the history of research on large wood in rivers

Swanson

Gregory

Iroumé

et al. 2020

Earth Surf Processes Landf

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Dynamics and functions of large wood have become integral considerations in the science and management of river systems. Study of large wood in rivers took place as monitoring of fish response to wooden structures placed in rivers in the central United States in the early 20th century, but did not begin in earnest until the 1970s. Research has increased in intensity and thematic scope ever since. A wide range of factors has prompted these research efforts, including basic understanding of stream systems, protection and restoration of aquatic ecosystems, and environmental hazards in mountain environments. Research and management have adopted perspectives from ecology, geomorphology, and engineering, using observational, experimental, and modelling approaches. Important advances have been made where practical information needs converge with institutional and science leadership capacities to undertake multi‐pronged research programmes. Case studies include ecosystem research to inform regulations for forest management; storage and transport of large wood as a component in global carbon dynamics; and the role of wood transport in environmental hazards in mountain regions, including areas affected by severe landscape disturbances, such as volcanic eruptions. As the field of research has advanced, influences of large wood on river structures and processes have been merged with understanding of streamflow and sediment regimes, so river form and function are now viewed as involving the tripartite system of water, sediment, and wood. A growing community of researchers and river managers is extending understanding of large wood in rivers to climatic, forest, landform, and social contexts not previously investigated. © 2020 John Wiley & Sons, Ltd.

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Section: Knowledge Gaps and Future Workmentioning

confidence: 99%

Reflections on the history of research on large wood in rivers

Swanson

Gregory

Iroumé

et al. 2020

Earth Surf Processes Landf

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“…On the mesohabitat scale, the richness and abundance of macroinvertebrates in fast habitats (riffles) were linked to the pronounced variability of depth [65]. On the contrary, at the microhabitat scale, most of the studies focused on the relationships between macroinvertebrate distribution and habitat attributes, especially hydraulic parameters such as roughness, Reynolds number, shear velocity, and Froude number [20,21,33,69,70]. Nevertheless, it is undeniable that the mesohabitat scale can reasonably summarize microhabitat conditions, thereby streamlining sampling efforts in terms of time and resources [21].…”

Section: Discussionmentioning

confidence: 99%

“…The role of environmental attributes, particularly hydraulics, in shaping macroinvertebrate assemblages at the genus or family level has been extensively explored [18,30,31]. However, the significance of other factors such as detritus, woody debris, and aquatic vegetation and their influence on macroinvertebrate communities, remains underexplored [32][33][34][35][36]. Furthermore, the integration of biological traits, reflecting species adaptation to the environment, into the study of macroinvertebrate communities has recently gained prominence [37].…”

Section: Introductionmentioning

confidence: 99%

Drivers of Macroinvertebrate Communities in Mediterranean Rivers: A Mesohabitat Approach

Alcaraz-Hernández,

Sánchez-Hernández,

Muñoz-Mas

et al. 2024

Sustainability

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We investigated the relationship between benthic macroinvertebrate community attributes (richness, abundance, biodiversity, and climate-specific and resistance forms) and the physical characteristics of distinct mesohabitats (hydromorphological unit types) discretized into fast (e.g., riffles or rapids) and slow (e.g., pools or glides) flow types in four Mediterranean rivers of Spain. Key attributes of hydromorphological units, including length, width, depth, shade, substrate composition, embeddedness, abundance of aquatic vegetation, and density of woody debris, were considered. Through a comprehensive suite of multivariate analyses, we unraveled taxonomic and habitat distinctions among rivers and hydromorphological unit types, with a notable influence of spatial proximity (greater similarity within the same river basin). In slow hydromorphological units, aquatic vegetation, depth, and abundance of coarse substrate emerged as pivotal factors shaping macroinvertebrate assemblages, whereas in fast-flowing units, vegetation, substrate embeddedness, and density of woody debris were the most important. Contrary to the remaining community attributes, the studied resistance forms (absent, eggs, cocoons, and cells against desiccation and diapause) exhibited uniformity across rivers despite observed variations in macroinvertebrate communities, underscoring regional functional analogies in biological and ecological mechanisms within the investigated Mediterranean river basins. This study contributes valuable insights for anticipating the repercussions of ongoing climate change, particularly in regions where fast-flowing hydromorphological units are more susceptible to depletion during drought periods.

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“…The shifts in the cover, structure, and typical stand‐age of riparian vegetation that we have documented likely have a web of implications for the properties of riparian habitats for moose, beavers, hares, songbirds, and other wildlife. In addition, riparian “greening” could impact aquatic biota in clearwater streams, since the addition of coarse woody debris and plant biomass is known to stimulate increases in invertebrate populations, which in turn have cascading aquatic ecosystem effects (Enefalk & Bergman, 2016; Melody & Richardson, 2004). These shifts could also serve as a bioindicator of change to physical processes and disturbance regime on subarctic floodplains.…”

Section: Discussionmentioning

confidence: 99%

Dynamic disequilibrium: Recent widespread increases in vegetation cover on subarctic floodplains of Interior Alaska

2023

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Boreal forest and tundra ecosystems are undergoing rapid climatic and environmental changes with consequences for ecosystem structure, function, and services. Although riparian zones occupy a small footprint within subarctic landscapes, they have disproportionately high value as foci of hydrological processes, biogeochemical cycling, ecological disturbance, biodiversity, and wildlife activity. Recent observations of increased winter discharge, reduced peak flows, and increased connectivity between catchments, streams, and groundwater in subarctic riparian zones have prompted predictions of altered riverine disturbance regimes, increased channelization, and a decline in the extent of active floodplains. However, few observational data exist concerning the spatiotemporal dynamics of subarctic floodplain vegetation, which can serve as a bioindicator to corroborate such predictions. We analyzed the distribution and extent of riparian ecotypes across a network of streams in 12 Interior Alaska watersheds using high-resolution image pairs from circa 1981-2010. All stream reaches encompassed pronounced elevational gradients and included elevational forest-tundra ecotones. We classified riparian ecotypes using an image-based point-intercept sampling approach, calculated the probability of ecotype transitions, and evaluated relationships between ecotype transitions and environmental covariates. Our results reveal widespread increases in the stature, density, and extent of riparian vegetation spanning gradients of elevation, floodplain morphology, and climate. Ecotype transitions occurred at >20% of sample points, and there was a strong imbalance toward forward successional transitions (16.5%) versus backward transitions (4.0%). That is, we observed a strong tendency toward increasing cover, stature, and density of vegetation communities across our extensive sampling domain across our approximately 30-year sample period. This relatively rapid riparian "greening" signal tended to be most pronounced in our glaciated watersheds.Although the streams we studied displayed high local variability in ecotype transitions, our results support hypotheses of increasing channelization and

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Effects of fine wood on macroinvertebrate drift in four boreal forest streams

Cited by 7 publications

References 59 publications

Reflections on the history of research on large wood in rivers

Reflections on the history of research on large wood in rivers

Drivers of Macroinvertebrate Communities in Mediterranean Rivers: A Mesohabitat Approach

Dynamic disequilibrium: Recent widespread increases in vegetation cover on subarctic floodplains of Interior Alaska

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