Invasive carp alter trophic niches of consumers and basal resources in African reservoirs

Dalu, Tatenda; Cuthbert, Ross N.; Moyo, Sydney; Wasserman, Ryan; Chari, Lenin D.; Weyl, Olaf L. F.; Jackson, Michelle C.

doi:10.1016/j.scitotenv.2021.152625

Cited by 4 publications

(3 citation statements)

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“…One of the main issues of the global disruption of the ecosystems is that it enhances vulnerability to biological invasion, as invasive species show a wide range of growth conditions, making it difficult to link their establishment to one single factor, but can take advantage of disturbed conditions (Boudouresque and Verlaque, 2012;Delpy et al, 2012;Dalu et al, 2022). This was the case for Berre lagoon's invasion by the ctenophore M. leidyi, where it was not possible to simply trace back this event to hydrological modification or salinity variations (Delpy et al, 2012).…”

Section: Global Ecological Evolution Contextmentioning

confidence: 99%

“…This species is a really disruptive invader, as it can bring about physical, chemical, and biological alterations through its feeding behavior, by increasing turbidity and resuspending sediments. It is well known for boosting phytoplankton blooms and deteriorating seagrass meadows (Fischer et al, 2013;Qiu et al, 2019;Dalu et al, 2022). F. enigmaticus and A. melas seem to be less concerning in the Biguglia lagoon case, as they were long-established and seem to have reached an equilibrium in the system.…”

Section: Global Ecological Evolution Contextmentioning

confidence: 99%

“…This species is known to have negative impacts on macrophytes, fish nets, water and sediment circulation, inducing cascade effects along the trophic network and ecological and economic damages (Fornoś et al, 1997;Bazterrica et al, 2012;Brundu and Magni, 2021). Eurasian carps Cyprinus carpio (Linnaeus, 1758) are the most widely introduced species in temperate aquatic systems and are drivers of ecological disruption by destructing seagrass beds and fueling phytoplankton blooms in lakes and reservoirs through their feeding behavior (Fischer et al, 2013;Qiu et al, 2019;Dalu et al, 2022). Other very recent and rapidly wide-spreading invaders in Mediterranean lagoons are the ctenophore Mnemiopsis leidyi (Agassiz, 1865) and the blue crab Callinectes sapidus (Rathbun, 1896).…”

Section: Introductionmentioning

confidence: 99%

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Long-term ecological trajectories of a disturbed Mediterranean coastal lagoon (Biguglia lagoon): Ecosystem-based approach and considering its resilience for conservation?

Ligorini

Garrido²,

Four

et al. 2022

Front. Mar. Sci.

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Coastal lagoons are subjected to ever-increasing direct or indirect anthropic pressures and are inexorably deteriorating with serious issues regarding their resilience. In this paper, we assessed the functioning and evolution of the highly disturbed Biguglia coastal lagoon (Mediterranean Sea, Corsica) through an ecosystem-based approach (EBA), using multiple biotic and abiotic proxies (hydro-climatic context and eutrophication), considering its connectivity to sea and watershed and biological compartments (macrophytes, phytoplankton, and invasive species) and taking into account human influence (management actions and fishing activities). The aim of this work is firstly to provide a comprehensive analysis of its long-term (2000–2021) ecological evolution trajectory and then, based on these results, to anticipate management strategies for supporting its conservation and restoration, and the maintenance of ecosystem services it offers. Results revealed that while the lagoon showed these days a good capacity to recover after disturbance and absorb change, it recently exhibited considerable changes in its phytoplankton community composition, developed an increased susceptibility to biological invasion, and experienced a drastic reduction in fish stocks. The major interannual variations of the mean salinity, strongly dependent on management interventions beyond natural climatic variability, summarized this instability. In the future, the lagoon may no longer be able to cope with even small disturbances, which could then be sufficient to reach a breakpoint and tip the system permanently into undesired/degraded states. We demonstrated that local and punctual management actions are not always beneficial for the entire ecosystem or even detrimental in some instances. Such a retrospective ecosystem-based approach is fundamental for producing the holistic insights required to implement efficient integrated ecosystem management. This further helps enhance lagoon resilience and hence preserve its ecosystem services in the context of increasing global changes. Such lessons are useful anywhere for comparable ecosystems.

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Section: Global Ecological Evolution Contextmentioning

confidence: 99%

Section: Global Ecological Evolution Contextmentioning

confidence: 99%