Untitled

McKie, Brendan G.; Cranston, Peter S.

doi:10.1023/a:1011974813551

Cited by 35 publications

(3 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The development of biofi lm on bark did not in-crease its consumption by invertebrates (Hax & Golladay 1993, Friberg & Jacobsen 1994. Whether this was a result of the substrata (bark + biofi lm) poor quality, toxicity (Canhoto & Graça 1999, McKie & Cranston 2001 or/and a consequence of the presence of a high quality resource in the stream -alder leaves -is unclear . Nonetheless, present evidence suggests a dominant physical and microbial degradative pathway for both eucalyptus leaves and bark, with macroinvertebrate processing playing a minor role.…”

Section: Discussionmentioning

confidence: 98%

The breakdown of Blue Gum (Eucalyptus globulus Labill.) bark in a Portuguese stream

Gonçalves¹,

Gama²,

Ferreira³

et al. 2007

fal

View full text Add to dashboard Cite

Eucalypt forests produce large amounts of bark, which potentially accumulate in streams, constituting an important carbon and nutrient source for benthic food webs. In this study, we compared the breakdown (and associated microbial activity and diversity and invertebrate abundance) of Eucalyptus globulus bark and leaves, enclosed in coarse and fi ne mesh bags, in a 3 rd order stream of central Portugal. Biofi lm development on bark was also analyzed with scanning electronic microscopy and respiration rates quantifi ed. After 90 days of incubation, bark lost 21-51 % of its initial mass while leaves lost 48-57 %. Fungal biomass (as determined from ergosterol concentrations) increased over time and was higher in leaves than in bark (79 vs. 50 mg [g AFDM] -1 at day 90). Sporulation by aquatic hyphomycetes was only observed after 2 weeks (leaves and bark in coarse mesh bags) or 2 months (bark in fi ne mesh bags). The initial litter mass converted into conidia in leaves was 7-45 fold the values found in bark. Fungal communities were dissimilar in the two substrates with bark presenting the lowest number of species. Lunulospora curvula and Anguillospora crassa dominated the fungal communities in bark, while L. curvula and Tetrachaetum elegans were the dominant species in leaves. Respiration rates, as a measurement of microbial activity, were lower in bark than in leaves (0.10 vs. 0.25 mg O 2 [g AFDM] -1 h -1 in fi ne mesh and 0.11 vs. 0.39 mg O 2 [g -1 AFDM] -1 h -1 in coarse mesh). Biofi lms in bark clearly increased after 15 days of immersion and contributed to 6-85 % of total oxygen consumption. Overall, the results suggest that microbial decomposition pathways dominate the processing of eucalyptus leaves and bark, although leaching and physical fragmentation may stimulate and facilitate the breakdown of bark.

show abstract

Section: Discussionmentioning

confidence: 98%

The breakdown of Blue Gum (Eucalyptus globulus Labill.) bark in a Portuguese stream

Gonçalves¹,

Gama²,

Ferreira³

et al. 2007

fal

View full text Add to dashboard Cite

show abstract

“…Community metrics recorded during field surveys therefore might not only reflect in-stream habitat conditions, but also the state of the surrounding terrestrial environment that provides the streams with colonists (Arnaiz et al, 2011;Collier, 1995;Moraes et al, 2014). If the riparian area is impaired or not fully natural, there may not be sufficient insects in their adult, terrestrial stages to produce eggs and aquatic larvae to colonise the stream bed even when wood may have created complex and favourable in-stream habitats (Jähnig et al, 2010;McKie & Cranston, 2001). This may have been the case in the upper River Cover catchment as the study tributaries were all draining homogeneous moors and conifer plantations, which were found to accommodate a limited diversity of macroinvertebrates (Ormerod et al, 1993).…”

Section: Benthic Macroinvertebratesmentioning

confidence: 99%

Effects of natural flood management woody dams on benthic macroinvertebrates and benthic metabolism in upland streams: Importance of wood‐induced geomorphic changes

Lo,

Klaar,

Smith

et al. 2024

Ecohydrology

View full text Add to dashboard Cite

Natural Flood Management (NFM) aims to reduce flood hazard by working with nature and is gaining prominence worldwide. One particular NFM technique involves the use of channel‐spanning woody dams that maintain a clearance height above baseflow. These dams function by increasing channel roughness during high flows and by forcing excessive water onto the floodplain. Whether these dams provide additional benefits to nature remains unclear. While there are many existing studies on natural in‐stream wood structures, very few have documented the impact of NFM woody dams in particular. This study adopted a multidisciplinary approach and a Before–After Control–Impact (BACI) research design to assess whether NFM woody dams installed in a small upland catchment had driven changes in benthic macroinvertebrate assemblages and benthic metabolic activities through the geomorphic changes that they had created. Statistical results indicate that macroinvertebrate density, richness, and diversity did not show any difference between stream reaches with and without NFM woody dams. The metrics were generally not related to grain‐size parameters and volumes of sediments eroded or deposited. However, individual genera such as Baetis and Rhithrogena became more dominant in the control reach towards the end of the study period, likely due to the higher flow velocities and coarser sediments there resulting from the lack of flow resistance in the absence of NFM woody dams. Rates of benthic respiration (but not rates of photosynthesis) were consistently significantly higher in woody dam reaches than in control reaches, likely due to the presence of patches of finer sediments in the former.

show abstract

“…These structural measures capture variation in the composition and distribution of benthic invertebrate communities, and sometimes include information about their functional traits, and thus are widely used to assess the current ecological status of habitats and to track changes in status as management measures are applied (Burdon et al, 2020;Dahl & Johnson, 2004). Inferences of ecosystem level impacts (e.g., on ecosystem processes regulating fluxes of nutrients and energy) from these structural measurements are possible-for example a decline in abundance or diversity of invertebrates consuming algal biofilms might indicate a reduction in the importance of algae as an energy source in that system (McKie & Cranston, 2001). However, such inferences should always be heavily qualified because underlying assumptions simplify the ecological complexity of the system studied.…”

Section: From Analyses Of Structure To Functional Metricsmentioning

confidence: 99%

Plant Litter Decomposition as a Tool for Stream Ecosystem Assessment

Frainer

Bruder

Colas

et al. 2021

The Ecology of Plant Litter Decomposition in Stream Ecosystems

View full text Add to dashboard Cite

The decomposition of plant litter in freshwaters is an integrative process involving multiple organism groups and connecting terrestrial and freshwater ecosystems. The quantification of leaf litter decomposition has been advocated as an effective indicator of ecosystem functional integrity in the bioassessment of freshwaters. Indeed, variation in litter decomposition rates has been used to detect the impacts of a wide range of anthropogenic disturbances on the functioning of detritus-based food webs in freshwater ecosystems, particularly in streams. However, these assessments have almost exclusively been undertaken as part of research projects, and the application of litter decomposition as a tool in routine biomonitoring remains limited. We evaluate the potential for litter decomposition as a tool for ecosystem assessment by environmental agencies and managers, drawing on insights and experiences from three lines of evidence: (i) a broad selection of published research projects, (ii) an

show abstract

Untitled

Cited by 35 publications

References 52 publications

The breakdown of Blue Gum (Eucalyptus globulus Labill.) bark in a Portuguese stream

The breakdown of Blue Gum (Eucalyptus globulus Labill.) bark in a Portuguese stream

Effects of natural flood management woody dams on benthic macroinvertebrates and benthic metabolism in upland streams: Importance of wood‐induced geomorphic changes

Plant Litter Decomposition as a Tool for Stream Ecosystem Assessment

Contact Info

Product

Resources

About