Mechanisms of trophic niche compression: Evidence from landscape disturbance DOI
Francis J. Burdon, Angus R. McIntosh, Jon S. Harding

et al.

Journal of Animal Ecology, Journal Year: 2019, Volume and Issue: 89(3), P. 730 - 744

Published: Nov. 6, 2019

Natural and anthropogenic disturbances commonly alter patterns of biodiversity ecosystem functioning. However, how networks interacting species respond to these changes remains poorly understood. We described aquatic food webs using invertebrate fish community composition, functional traits stable isotopes from twelve agricultural streams along a landscape disturbance gradient. predicted that excessive deposition fine inorganic sediment (sedimentation) associated with activities would negatively influence trophic diversity (e.g. reduced vertical horizontal niche breadths). hypothesized multiple mechanisms might cause 'compression', as indicated by in realized roles. Food-web properties based on consumer isotope data (δ13 C δ15 N) showed increasing was diversity. In particular, the occupied smaller area isotopic space sedimentation gradient best explained narrowing δ13 range. Decreased partitioning, driven habitat homogeneity, environmental filtering resource scarcity all seemingly lead greater equivalency caused collapse autochthonous food-web channel. Bayesian mixing-model analyses supported this contention consumers increasingly reliant detritus gradient, predatory invertebrates relying more prey basal resources. The range contributed an apparent 'trophic shift' towards terrestrial carbon, further indicating loss On axis, became separated increase their estimated position. combination, responses were most likely mediated through densities diminished reliance prey. Although losses remain major threat integrity, roles biota persist dictate functioning change. Sedimentation nonlinear reductions which could affect stability ecosystems. Our study helps explain may radically reshape response type disturbance.

Language: Английский

High Redundancy as well as Complementary Prey Choice Characterize Generalist Predator Food Webs in Agroecosystems DOI Creative Commons

Eve Roubinet,

Tomas Jönsson,

Gerard Malsher

et al.

Scientific Reports, Journal Year: 2018, Volume and Issue: 8(1)

Published: May 17, 2018

Abstract Food web structure influences ecosystem functioning and the strength stability of associated services. With their broad diet, generalist predators represent key nodes in many food webs they contribute substantially to services such as biological pest control. However, until recently it has been difficult empirically assess with predators. We utilized DNA-based molecular gut-content analyses prey use a set invertebrate predator species common temperate agricultural fields. investigated degree specialization predator-prey at two stages cropping season analysed link temperature different trophic links, identify non-random predation. found low level our webs, identified warm cool links which may result from active choice or avoidance. also within-season variation interaction between aphid pests differed among species. Our results show high time-specific functional redundancy community, but suggest temporally complementary due succession some

Language: Английский

Citations

62
Land use alters trophic redundancy and resource flow through stream food webs DOI
Elliott L. Price, Mirela Sertić Perić, Gustavo Q. Romero

et al.

Journal of Animal Ecology, Journal Year: 2019, Volume and Issue: 88(5), P. 677 - 689

Published: Feb. 3, 2019

Abstract The changes to physical and chemical ecosystem characteristics as a response pervasive intensifying land use have the potential alter consumer–resource interactions rewire flow of energy through entire food webs. We investigated these structural functional properties webs in stream ecosystems distributed across woodland, agricultural urban areas Zagreb region Croatia. compared resource availability consumer diet composition using stable isotope mixing models tested how isotopic variance basal resources, primary consumers, macroinvertebrate predators other web change with different land‐use types. Combination increased loading altered nutrients, lower water discharge higher light at sites likely promoted contribution aquatic macrophytes diets consumers. Macroinvertebrate shifted their diet, relying more on active filterers relative woodland sites. Urban also had trophic redundancy (i.e. fewer species each level) homogenized from levels. There was no effect variation consumers or predators, but all groups were 15 N‐enriched counterparts associated intensive availability, levels, potentially negative consequences for community dynamics functioning. These empirical findings indicate that reducing nutrient pollution, runoffs maintaining riparian vegetation can mitigate impacts structure function ecosystems.

Language: Английский

Citations

62
Methods for Trophic Ecology Assessment in Fishes: A Critical Review of Stomach Analyses DOI
Estevan Luiz da Silveira, Nabil Semmar, Joan Enric Cartes

et al.

Reviews in Fisheries Science & Aquaculture, Journal Year: 2019, Volume and Issue: 28(1), P. 71 - 106

Published: Nov. 4, 2019

Assessment of fish trophic ecology in natural environments is imperative to understand biological and ecological requirements, supporting the management conservation populations environments. There are several methods available assess diets, generically divided noninvasive approaches, such as underwater observations, invasive analyses lipid biomarkers, stable isotopes stomach contents. Each one has application assumptions conditions that must be aligned with study objectives methodological criteria, assuring results robustness allowing comparability among different studies. This review addresses advantages limitations these methods, highlighting those applied for analysis (SA). work presents complete updated concerning qualitative quantitative SA: sixty equations were reviewed comprising four formulae value stomachs per se and, content analysis, eight single indices, fifteen composite indices thirty-three related modeling approaches. The potentialities associated standardizes distinct names a same method, provides clarifications on confusion sources due use source scientific mistakes detected specialized literature.

Language: Английский

Citations

56
Prey partitioning and livestock consumption in the world’s richest large carnivore assemblage DOI Creative Commons

Xinning Shao,

Qi Lu,

Mengyin Xiong

et al.

Current Biology, Journal Year: 2021, Volume and Issue: 31(22), P. 4887 - 4897.e5

Published: Oct. 22, 2021

Language: Английский

Citations

56
Mechanisms of trophic niche compression: Evidence from landscape disturbance DOI
Francis J. Burdon, Angus R. McIntosh, Jon S. Harding

et al.

Journal of Animal Ecology, Journal Year: 2019, Volume and Issue: 89(3), P. 730 - 744

Published: Nov. 6, 2019

Natural and anthropogenic disturbances commonly alter patterns of biodiversity ecosystem functioning. However, how networks interacting species respond to these changes remains poorly understood. We described aquatic food webs using invertebrate fish community composition, functional traits stable isotopes from twelve agricultural streams along a landscape disturbance gradient. predicted that excessive deposition fine inorganic sediment (sedimentation) associated with activities would negatively influence trophic diversity (e.g. reduced vertical horizontal niche breadths). hypothesized multiple mechanisms might cause 'compression', as indicated by in realized roles. Food-web properties based on consumer isotope data (δ13 C δ15 N) showed increasing was diversity. In particular, the occupied smaller area isotopic space sedimentation gradient best explained narrowing δ13 range. Decreased partitioning, driven habitat homogeneity, environmental filtering resource scarcity all seemingly lead greater equivalency caused collapse autochthonous food-web channel. Bayesian mixing-model analyses supported this contention consumers increasingly reliant detritus gradient, predatory invertebrates relying more prey basal resources. The range contributed an apparent 'trophic shift' towards terrestrial carbon, further indicating loss On axis, became separated increase their estimated position. combination, responses were most likely mediated through densities diminished reliance prey. Although losses remain major threat integrity, roles biota persist dictate functioning change. Sedimentation nonlinear reductions which could affect stability ecosystems. Our study helps explain may radically reshape response type disturbance.

Language: Английский

Citations

55