Recovering trophic structure through habitat restoration: A review

Food Webs, Journal Year: 2020, Volume and Issue: 25, P. e00162 - e00162

Published: Aug. 22, 2020

Language: Английский

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Widespread variation in stable isotope trophic position estimates: patterns, causes, and potential consequences

Ecological Monographs, Journal Year: 2021, Volume and Issue: 91(3)

Published: March 5, 2021

Abstract Stable isotope analysis is one of the most widely used techniques to estimate trophic position and provides fundamental insight into structure management ecological communities. To account for effects geographic variation in levels, typically estimated relative an “baseline” (i.e., material representing variation) using a methodology such as formula or statistical analysis. There is, however, remarkable baselines methodologies from stable isotopes. The consequences this lack standardization are unknown but could result biased erroneous conclusions. We conducted literature review quantify Next, we assessed on individual species estimates food web by extracting published positions applying various existing data sets. identified 10 eight methodologies, use which varied ecosystem studied. Moreover, found that different yield significantly species, well conclusions about structure. Authors should avoid biological interpretations absolute, stand‐alone (as these prone number biases). recommend pairing with other more robust Increased sample size may mitigate some caused methodologies; alarmingly large proportion studies collected only at least group (41% all reviewed studies). collect minimum five samples per (but ten best practices) many groups possible increase power redundancy comparisons. When unavoidably constrained, compound‐specific taxon‐specific discrimination factor, because it be accurate require fewer maintain appropriate power. Implementing our recommendations will robustness accuracy based isotopes, resulting better decisions understanding

Language: Английский

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Trophic niche dynamics of two fish mesoconsumers in adjacent coastal habitats with varying nutrient regimes

Oecologia, Journal Year: 2025, Volume and Issue: 207(3)

Published: Feb. 28, 2025

Language: Английский

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Restored streams recover food web properties but with different scaling relationships when compared with natural streams

Ecological Applications, Journal Year: 2025, Volume and Issue: 35(2)

Published: March 1, 2025

Despite extensive studies revealing differences in the composition of aquatic assemblages between restored streams and natural or pre-restoration states, understanding ecological consequences trajectories stream restoration remains challenging. Food webs are an important way mapping biodiversity to ecosystem functioning by describing feeding linkages energy transfer pathways. Describing food can provide insights into restoration. This study analyzed unprecedented large quantity web data (more than 1700 webs) based on long-term (2008-2018) biomonitoring South Korea using a link extrapolation. By doing so, we aimed describe general patterns for reassembly streams. Specifically, 12 indices related structure robustness compared them with those First, species richness, numbers, density, connectance were all lower streams, indicating smaller less complexity. Second, scaling relationship analyses other richness showed different mechanisms structuring In particular, greater generalist consumers was identified as major mechanism that increased which may increase their against external disturbances. The fractions top, intermediate, basal nodes changed rapidly tended over time, reaching level similar suggests recovery is underway. Overall, our findings indicate have features distinct from suggesting high compositional flexibility, broad diet driving forces behind these differences. Our help support sustainable management through strategies. These results new potential

Language: Английский

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Long-term recovery of benthic food webs after stream restoration

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 923, P. 171499 - 171499

Published: March 5, 2024

The assessment of restoration success often neglects trophic interactions within food webs, focusing instead on biodiversity and community structure. Here, we analysed the long-term recovery web structure based stable isotopes (δ13C δ15N) benthic invertebrates quantified responses metrics to time since restoration. samples derived from twelve restored sites with different ages, sampled annually 2012 2021, covering an investigation period up 28 years after for whole catchment. Temporal developments were compared development two near-natural sites. measures consisted cessation sewage inflow morphological channels. As a clear consistent result over almost all sites, similarity (proportion co-existing species occupying similar niches) increased restoration, reached values suggesting increase in stability resilience webs. Surprisingly, resource diversity decreased at most 10 probably due removal wastewater-derived resources, shift towards leaf litter as dominant following regrowth riparian vegetation. Food chain length showed no pattern both increasing decreasing Overall, had effects stream ecosystems. While some such others response context dependent. study demonstrates potential utilizing metrics, particularly similarity, research achieve more holistic understanding ecosystem recovery.

Language: Английский

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Spatial and Ontogenetic Trophic Dynamics of Co-occurring Predatory Fishes in a Northern Gulf of Mexico Estuary

Estuaries and Coasts, Journal Year: 2024, Volume and Issue: 47(4), P. 1119 - 1138

Published: April 24, 2024

Abstract Co-occurring predators often exhibit ecological niche partitioning, resulting from competition over evolutionary time. However, in productive estuarine ecosystems with high resource availability, may occupy similar niches without conflict. Determining the degree of partitioning and overlap among co-occurring can provide insights into a food web’s function its potential resiliency to perturbations. This study used stable isotope analysis assess trophic ecology four Galveston Bay, Texas, USA: spotted seatrout, black drum, bull shark, alligator gar. Spatially distinct primary producer isotopic ratios emerged for both δ 13 C 15 N following salinity regimes, which translated patterns predator tissue. The volume species’ also varied spatially, species-specific expansion contraction across freshwater-marine continuum. observed were likely related movements, implications coupling landscape. Using regional delineations baseline values yielded position estimates that validated by compound-specific isotopes (3.77 3.96) all species but drum (3.25). Trophic increased body length these relationships differed when using estuary-wide versus regionally baselines. Alligator gar gut contents examined, primarily aligned piscivory included previously unreported taxa (insect, mammal). Collectively, results evidence spatial ontogenetic shifts within this assemblage highlight importance scale examine webs.

Language: Английский

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Individual consumer movement mediates food web coupling across a coastal ecosystem

Ecosphere, Journal Year: 2020, Volume and Issue: 11(12)

Published: Dec. 1, 2020

Abstract The movement and foraging patterns of consumers are a major driver nutrient energy distribution in ecosystems. However, relatively little is known about how intraspecific variation consumer behavior might affect food web coupling ecosystem processes across landscapes seascapes. Here we use long‐term acoustic telemetry stable isotope niche metrics to understand differences predatory fish control resource subsidies the Florida Coastal Everglades (USA). We found common snook ( Centropomus undecimalis ) that spent most their time freshwater riverine areas Shark River Estuary primarily foraged on prey originating from adjacent marsh habitats, serving as an important vector downstream habitats. Snook majority estuarine habitats displayed diversity usage wide spatial scales, occupied much larger trophic niche, serve multidirectional among marine, estuarine, These results demonstrate individual variations predator can mediate direction scale coastal

Language: Английский

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Differences in trophic structure and trophic pathways between artificial reef and natural reef ecosystems along the coast of the North yellow Sea, China, based on stable isotope analyses

Ecological Indicators, Journal Year: 2021, Volume and Issue: 125, P. 107476 - 107476

Published: Feb. 21, 2021

Artificial reefs have been employed to promote enrichment of degraded habitats communities and support local fisheries. To better evaluate the performance artificial reefs, simultaneous comparisons with relatively undisturbed natural nearby are essential. With inclusion stable isotope method characterize compare ecosystem functioning for two reef systems, both trophic structure flow at an a evaluated in present work. We found that: 1) macrobenthos fish can be clustered into five groups each site, similar grouping configurations structures, 2) energy pathways from basal resources between reef, although pathway magnitudes may spatially different. elucidate comprehensive viewpoint, we reconstructed general model up fishes where pelagic based on POM benthic either Chlorophyta or mixture microphytobenthos, identified. conclude that has established years those provided by ecosystem. In future, call specific compartments combination ecology community structure, understand development systems.

Language: Английский

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Trophic interactions of reef-associated predatory fishes (Hexagrammos otakii and Sebastes schlegelii) in natural and artificial reefs along the coast of North Yellow Sea, China

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 791, P. 148250 - 148250

Published: June 6, 2021

Language: Английский

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Spectral diversity allows remote detection of the rehabilitation status in an Amazonian iron mining complex

International Journal of Applied Earth Observation and Geoinformation, Journal Year: 2021, Volume and Issue: 106, P. 102653 - 102653

Published: Dec. 16, 2021

Mineland rehabilitation is intended to reduce the overall impacts of mining on biodiversity and ecosystem services requires periodic monitoring guarantee institutional tractability refine practices. As time- money-consuming field surveys challenge this monitoring, aim study was develop a remote sensing framework assess environmental quality minelands undergoing based free open-access multispectral Sentinel-2 images. For purpose, we linked spectral diversity, i.e., measures variation among neighboring pixels, field-surveyed chronosequence covering five waste piles in Carajás National Forest, Eastern Amazon. Field data were separated into training set from 2017 (54 plots) testing 2019 (66 plots). Based set, optimized computational parameters diversity (separation vegetated nonvegetated pixels by normalized difference vegetation index [NDVI], size buffer zones, number clusters representing distinct species applied metrics), maximizing accuracy approach. Then, validated procedure with compared areas their 2019. The our methodology 83%, user producer accuracies exceeded 60% for all classes, enabling successional advancement rehabilitating minelands. Despite punctual losses detected comprehensive gains within target structures. This due an increase area 282.39 364.54 ha, but enhancements already indicate these time, reducing impact activities services. We conclude that presented here promising mapping rehabilitation, encourage its integration current protocols costs transparency company's activities, as freely available satellite images open-source software are applied.

Language: Английский

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