Global Changes Jeopardize the Trophic Carrying Capacity and Functioning of Estuarine Ecosystems

Chevillot, Xavier; Tecchio, Samuele; Chaalali, Aurélie; Lassalle, Géraldine; Selleslagh, Jonathan; Castelnaud, Gérard; David, Valérie; Bachelet, Guy; Niquil, Nathalie; Sautour, Benoît; Lobry, Jérémy

doi:10.1007/s10021-018-0282-9

Cited by 23 publications

(21 citation statements)

References 106 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While we documented a major decline in r-selected fishes in parallel to rapid warming, changes in trophic structure and ecosystem functioning may have exacerbated the shift in functional structure (Chevillot et al, 2016(Chevillot et al, , 2018. Given the relative increase in K-selected fishes in parallel to the decline in r-selected fishes, it is possible that trophic re-balancing reinforced community changes as Kselected piscivores may have over-exploited the already-declining rstrategists, leading to a negative feedback.…”

Section: Discussionmentioning

confidence: 74%

Functional reorganization of marine fish nurseries under climate warming

McLean

Mouillot

Goascoz

et al. 2018

Global Change Biology

View full text Add to dashboard Cite

While climate change is rapidly impacting marine species and ecosystems worldwide, the effects of climate warming on coastal fish nurseries have received little attention despite nurseries’ fundamental roles in recruitment and population replenishment. Here, we used a 26‐year time series (1987–2012) of fish monitoring in the Bay of Somme, a nursery in the Eastern English Channel (EEC), to examine the impacts of environmental and human drivers on the spatial and temporal dynamics of fish functional structure during a warming phase of the Atlantic Multidecadal Oscillation (AMO). We found that the nursery was initially dominated by fishes with r‐selected life‐history traits such as low trophic level, low age and size at maturity, and small offspring, which are highly sensitive to warming. The AMO, likely superimposed on climate change, induced rapid warming in the late 1990s (over 1°C from 1998 to 2003), leading to functional reorganization of fish communities, with a roughly 80% decline in overall fish abundance and increased dominance by K‐selected fishes. Additionally, historical overfishing likely rendered the bay more vulnerable to climatic changes due to increased dominance by fishing‐tolerant, yet climatically sensitive species. The drop in fish abundance not only altered fish functional structure within the Bay of Somme, but the EEC was likely impacted, as the EEC has been unable to recover from a regime shift in the late 1990s potentially, in part, due to failed replenishment from the bay. Given the collapse of r‐selected fishes, we discuss how the combination of climate cycles and global warming could threaten marine fish nurseries worldwide, as nurseries are often dominated by r‐selected species.

show abstract

Section: Discussionmentioning

confidence: 74%

Functional reorganization of marine fish nurseries under climate warming

McLean

Mouillot

Goascoz

et al. 2018

Global Change Biology

View full text Add to dashboard Cite

show abstract

“…As spatial variation in the trophic ecology of predators like C. latus and C. hippos may not only influence the growth and survival of their juveniles, but also modulate their respective roles in the functioning of estuarine food webs, such cross-sites comparisons could be key for evaluating the implications of different co-existence scenarios, not only on the maintenance of coastal fish stocks but also on the composition and functioning of estuarine systems. This should be undertaken keeping in mind that both anthropic pressures and Climate Change may displace the environmental boundaries of estuaries or alter the composition and productivity of their food webs (Araújo et al 2016, Chevillot et al 2019, thereby affecting the way fish species exploit estuarine resources and modifying their roles in food webs. and Sirinhaém (c.) estuaries (black dots).…”

Section: Discussionmentioning

confidence: 99%

Trophic ecology of the juveniles of two jack species (Caranx latus and C. hippos) in contrasted tropical estuaries

Gonzalez

Darnaude

Duarte‐Neto

et al. 2021

Estuarine, Coastal and Shelf Science

View full text Add to dashboard Cite

“…For that reason, empirically based food web studies on time-varying environments using a steady-state assumption usually reduce their system to a succession of steady-states, each corresponding to a given time slice, be it the year (e.g. Chevillot et al, 2019;Legagneux et al, 2012) or the season (e.g. Saavedra, Rohr, Fortuna, Selva, & Bascompte, 2016).…”

Section: Introductionmentioning

confidence: 99%

From winter to summer and back: Lessons from the parameterization of a seasonal food web model for the Białowieża forest

Sauve

Barraquand

2020

Journal of Animal Ecology

View full text Add to dashboard Cite

1. Dynamic food web models describe how species abundances change over time as a function of trophic and life-history parameters. They are essential to predicting the response of ecosystems to perturbations. However, they are notoriously difficult to parameterize, so that most models rely heavily either on allometric scaling of parameters or inverse estimation of biomass flows. The allometric approach makes species of comparable body mass have near-identical parameters which can generate extinctions within a trophic level. The biomass flow approach is more precise, but is restricted to steady-states, which is not appropriate for time-varying environments.2. Adequately parameterizing large food webs of temperate and arctic environments requires dealing both with many species of similar sizes and a strongly seasonal environment. Inspired by the rich empirical knowledge on the vertebrate food web of the Białowieża forest, we parameterize a bipartite food web model comprising 21 predators and 124 prey species. Our model is a non-autonomous coupled ordinary differential equations system that allows for seasonality in life-history and predation parameters.3. Birth and death rates, seasonal descriptions of diet for each species, food requirements and biomass information are combined into a seasonal parameterization of a dynamic food web model. Food web seasonality is implemented with time-varying intrinsic growth rate and interaction parameters, while predation is modelled with both type I and type II functional responses.4. All our model variants allow for >80% persistence in spite of massive apparent competition, and a quantitative match to observed (seasonal) biomasses. We also identify trade-offs between maximizing persistence, reproducing observed biomasses, and ensuring model robustness to sampling errors. Although multi-annual cycles are expected with type II functional responses, they are here prevented by a strong predator self-regulation. We discuss these results and possible improvements on the model. 5. We provide a general workflow to parameterize dynamic food web models in seasonal environments, based on a real case study. This may help to better predict how biodiverse food webs respond to changing environments.

show abstract

Global Changes Jeopardize the Trophic Carrying Capacity and Functioning of Estuarine Ecosystems

Cited by 23 publications

References 106 publications

Functional reorganization of marine fish nurseries under climate warming

Functional reorganization of marine fish nurseries under climate warming

Trophic ecology of the juveniles of two jack species (Caranx latus and C. hippos) in contrasted tropical estuaries

From winter to summer and back: Lessons from the parameterization of a seasonal food web model for the Białowieża forest

Contact Info

Product

Resources

About