scholarly journals Functional diversity responses of a nearshore fish community to restoration driven by large-scale dam removal

2018 ◽  
Vol 213 ◽  
pp. 245-252 ◽  
Author(s):  
J. Anne Shaffer ◽  
Stuart Munsch ◽  
Francis Juanes
Keyword(s):  
Functional Diversity ◽  
Fish Community ◽  
Large Scale ◽  
Dam Removal

Nearshore fish community responses to large scale dam removal: implications for watershed restoration and fish management

2017 ◽  
Vol 79 (3) ◽  
pp. 643-660 ◽  
Author(s):  
J. Anne Shaffer ◽  
Francis Juanes ◽  
Thomas P. Quinn ◽  
Dave Parks ◽  
Tara McBride ◽  
...  
Keyword(s):  
Fish Community ◽  
Large Scale ◽  
Dam Removal ◽  
Watershed Restoration ◽  
Community Responses ◽  
Fish Management

scholarly journals Repeated surveying over 6 years reveals that fine-scale habitat variables are key to tropical mountain ant assemblage composition and functional diversity

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mulalo M. Muluvhahothe ◽  
Grant S. Joseph ◽  
Colleen L. Seymour ◽  
Thinandavha C. Munyai ◽  
Stefan H. Foord
Keyword(s):  
Climate Change ◽  
Species Composition ◽  
High Altitude ◽  
Functional Diversity ◽  
Large Scale ◽  
Climate Models ◽  
Spatial Scales ◽  
Abiotic Factors ◽  
Composition Analysis ◽  
Fine Scale

AbstractHigh-altitude-adapted ectotherms can escape competition from dominant species by tolerating low temperatures at cooler elevations, but climate change is eroding such advantages. Studies evaluating broad-scale impacts of global change for high-altitude organisms often overlook the mitigating role of biotic factors. Yet, at fine spatial-scales, vegetation-associated microclimates provide refuges from climatic extremes. Using one of the largest standardised data sets collected to date, we tested how ant species composition and functional diversity (i.e., the range and value of species traits found within assemblages) respond to large-scale abiotic factors (altitude, aspect), and fine-scale factors (vegetation, soil structure) along an elevational gradient in tropical Africa. Altitude emerged as the principal factor explaining species composition. Analysis of nestedness and turnover components of beta diversity indicated that ant assemblages are specific to each elevation, so species are not filtered out but replaced with new species as elevation increases. Similarity of assemblages over time (assessed using beta decay) did not change significantly at low and mid elevations but declined at the highest elevations. Assemblages also differed between northern and southern mountain aspects, although at highest elevations, composition was restricted to a set of species found on both aspects. Functional diversity was not explained by large scale variables like elevation, but by factors associated with elevation that operate at fine scales (i.e., temperature and habitat structure). Our findings highlight the significance of fine-scale variables in predicting organisms’ responses to changing temperature, offering management possibilities that might dilute climate change impacts, and caution when predicting assemblage responses using climate models, alone.

scholarly journals Appraising the Status of Fish Community Structure in the Yellow Sea Based on an Indicator-Testing Framework

2021 ◽  
Vol 8 ◽  
Author(s):  
Yuru Li ◽  
Shuyang Ma ◽  
Caihong Fu ◽  
Yongjun Tian ◽  
Jianchao Li ◽  
...  
Keyword(s):  
Climate Change ◽  
Fisheries Management ◽  
Fish Community ◽  
Large Scale ◽  
The Yellow Sea ◽  
Total Catch ◽  
Fish Community Structure ◽  
Testing Framework ◽  
The Status ◽  
Ecosystem Based Fisheries Management

Fish community structure (FCS) of the Yellow Sea (YS) is affected by multiple pressures. Quantifying the responses of indicators of FCS (IFCSs) to pressures is a key aspect of ecosystem-based fisheries management. Quantitative methodology has hitherto been rarely applied to evaluate the performance of ecological indicators in response to physical and anthropogenic pressures and management actions. In this study, we adopted a quantitative and flexible framework to quantify the performance of IFCSs in the YS as well as to identify a suite of operational IFCSs to evaluate the status of the FCS via two state-space approaches. A total of 22 IFCSs were tested for their responses to three types of pressures including anthropogenic activities (fishing), large-scale climate change, and regional environmental variables. Our results indicate that the majority of IFCSs have good performance in terms of sensitivity in their responses to pressures, but weak performance in terms of robustness. The IFCSs tend to respond stronger to fishing than to large-scale climatic indices and regional environmental indices both in terms of sensitivity and robustness. A final indicator suite of five best-performing IFCSs was identified. The five IFCSs include total catch (ToC), mean trophic level (MTL), the ratio of catch of large predatory groups to total catch (LPC/ToC), mean temperature of catch (MTC) [or alternatively catch of small pelagic groups (SPC)], and functional evenness based on thermal groups (T-J′FD), all of which show regime shift patterns consistent with climate change. Compared to a reference period (1960–1964), the status of the current FCS has been obviously changed, and the long-term trajectories of the final indicator suite is consistent with that of fishing pressure. This study demonstrates the applicability of the indicator-testing framework in appraising the status of FCS, and facilitates moving towards ecosystem-based fisheries management in the YS.

scholarly journals Functional Diversity of the Fish Community Associated to Soft-Bottoms in the Lagoon of La Paz B.C.S., México

2020 ◽  
Vol 10 (04) ◽  
pp. 233-244
Author(s):  
Hernandez-Villasana Carlos Samuel ◽  
Barjau-González Emelio ◽  
López-Vivas Juan Manuel ◽  
Armenta-Quintana José Angel ◽  
Suárez-Villavicencio Jaime
Keyword(s):  
Functional Diversity ◽  
Fish Community ◽  
La Paz ◽  
Soft Bottoms

Debris dams as habitat for aquatic invertebrates in forested headwater streams: a large-scale field experiment

2019 ◽  
Vol 70 (5) ◽  
pp. 734
Author(s):  
Brenda R. Baillie ◽  
Brendan J. Hicks ◽  
Ian D. Hogg ◽  
Michael R. van den Heuvel ◽  
Mark O. Kimberley
Keyword(s):  
Large Scale ◽  
Aquatic Invertebrates ◽  
Headwater Streams ◽  
Dam Removal ◽  
Aquatic Invertebrate ◽  
Invertebrate Communities ◽  
Debris Dams ◽  
Scale Field ◽  
Large Scale Field ◽  
Debris Dam

To evaluate the effects of debris dams on aquatic invertebrate communities, we sampled benthic invertebrates in debris dams and riffles in three forested headwater streams in New Zealand. As part of a large-scale field experiment, debris dams were subsequently removed from three treatment sections in each of the streams to assess effects on invertebrate communities. Prior to debris dam removal, total invertebrate densities in debris dams were not significantly different from those in riffles. However, densities of Ephemeroptera, Plecoptera and Trichoptera taxa were significantly higher in debris dams than in riffles. Debris dams contained a higher number of less common taxa (defined as <1% of total catch) and significantly higher densities of shredders. Densities for Coleoptera, Diptera and Trichoptera taxa were significantly higher in the autumn than in the spring. Non-metric multidimensional scaling axis scores indicated that both habitat and season had a significant effect on aquatic invertebrate community composition. At the reach scale, the effects of debris dam removal on the aquatic invertebrate communities were not statistically detectable because debris dams comprised only a small proportion of total habitat. However, these data highlight the importance of debris dams in contributing to the diversity of aquatic invertebrates in forested headwater streams.

Fish community succession and biomanipulation to control two common aquatic ecosystem stressors during a large-scale floodplain lake restoration

Hydrobiologia ◽  
2016 ◽  
Vol 804 (1) ◽  
pp. 73-88 ◽  
Author(s):  
Todd D. VanMiddlesworth ◽  
Nerissa N. McClelland ◽  
Greg G. Sass ◽  
Andrew F. Casper ◽  
Timothy W. Spier ◽  
...  
Keyword(s):  
Aquatic Ecosystem ◽  
Fish Community ◽  
Large Scale ◽  
Lake Restoration ◽  
Floodplain Lake ◽  
Community Succession ◽  
Ecosystem Stressors

scholarly journals Temperate fish community variation over seasons in relation to large-scale geographic seascape variables

2018 ◽  
Vol 75 (10) ◽  
pp. 1723-1732 ◽  
Author(s):  
Diana Perry ◽  
Thomas A.B. Staveley ◽  
Linus Hammar ◽  
Alyssa Meyers ◽  
Regina Lindborg ◽  
...  
Keyword(s):  
Shallow Water ◽  
Deep Water ◽  
Seasonal Changes ◽  
Fish Community ◽  
Large Scale ◽  
Spatial Scales ◽  
Wave Exposure ◽  
Fish Assemblage Structure ◽  
Swedish West Coast ◽  
Latitudinal Position

In shallow-water marine environments, ecosystem functioning is a complex interworking of fine-scale characteristics and region-wide factors, and the importance of these variables can vary on multiple temporal and spatial scales. This underwater video study targeted seasonal changes in the fish community of seagrass habitats along the Swedish west coast and the influence of offshore seascape variables (latitudinal position, wave exposure, open ocean, and deep water). Results showed that fish assemblage structure exhibited seasonal changes between summer and autumn and strong spatiotemporal variations in the importance of offshore factors affecting shallow-water fish communities. In summer, abundance from the Gobiidae family responded to wave exposure, whereas the Gadidae family and juvenile migrant habitat preference guild responded to latitudinal position and proximity to deep water. In autumn, deep water was related to abundance of Gadidae and juvenile migrants, whereas latitudinal position influenced Gasterosteidae. These findings underscore the importance of understanding the influence of offshore factors on facets of coastal fish assemblages to address large-scale geographic connectivity along nearshore–offshore gradients.

Fish Community Response to a Small-Stream Dam Removal in a Maine Coastal River Tributary

2015 ◽  
Vol 144 (3) ◽  
pp. 467-479 ◽  
Author(s):  
Robert S. Hogg ◽  
Stephen M. Coghlan ◽  
Joseph Zydlewski ◽  
Cory Gardner
Keyword(s):  
Fish Community ◽  
Dam Removal ◽  
Community Response ◽  
Small Stream ◽  
Coastal River

Response of a floodplain fish community to river-floodplain connectivity: natural versus managed reconnection

2014 ◽  
Vol 71 (2) ◽  
pp. 236-245 ◽  
Author(s):  
R.J. Stoffels ◽  
K.R. Clarke ◽  
R.A. Rehwinkel ◽  
B.J. McCarthy
Keyword(s):  
Native Species ◽  
Fish Community ◽  
Large Scale ◽  
Environmental Flows ◽  
Regulated River ◽  
Pest Species ◽  
Fish Community Structure ◽  
River Floodplain ◽  
Natural Connection ◽  
Flood Pulses

To restore lateral connectivity in highly regulated river-floodplain systems, it has become necessary to implement localized, “managed” connection flows, made possible using floodplain irrigation infrastructure. These managed flows contrast with “natural”, large-scale, overbank flood pulses. We compared the effects of a managed and a natural connection event on (i) the composition of the large-bodied fish community and (ii) the structure of an endangered catfish population of a large floodplain lake. The change in community composition following the managed connection was not greater than that exhibited between seasons or years during disconnection. By contrast, the change in fish community structure following the natural connection was much larger than that attributed to background, within- and between-year variability during disconnection. Catfish population structure only changed significantly following the natural flood. While the natural flood increased various population rates of native fishes, it also increased those of non-native carp, a pest species. To have a positive influence on native biodiversity, environmental flows may need to be delivered to floodplains in a way that simulates the properties of natural flood pulses. A challenge, however, will be managing river-floodplain connectivity to benefit native more than non-native species.

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