Effects of the introduction of an omnivorous fish on the biodiversity and functioning of an upland Amazonian lake

Nobre, Regina L. G.; Caliman, Adriano; Guariento, Rafael Dettogni; Bozelli, Reinaldo Luiz; Carneiro, Luciana S.

doi:10.1590/1809-4392201804131

Cited by 6 publications

(2 citation statements)

References 73 publications

(82 reference statements)

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“…A study showed that phytoplankton P limitation was reduced in a lake with an invasive omnivorous fish species (Astyanax bimaculatus), showing higher chlorophyll-a concentrations than neighboring environments without the invasive fish. The P limitation of the phytoplankton was alleviated due to the high P content present in the fish excretion (Nobre et al 2019). Another study performed in a tropical reservoir also showed that Nile tilapia increased N and P availability via excretion and promoted algae growth (Figueredo & Giani 2005).…”

Section: Invasive Speciesmentioning

confidence: 97%

Human Impacts on Aquatic Ecosystems From the Lens of Ecological Stoichiometry

et al. 2022

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Aquatic ecosystems are under different anthropogenic pressures, such as climate change, eutrophication, chemical pollution, overfishing, and introducing exotic species. Human activities have accelerated biogeochemical cycles forcing organisms and ecosystems to adapt. Most ecological stoichiometry studies are focused on carbon, nitrogen, phosphorus, and their relative proportions. Still, the possibilities for investigations using other elements to better understand the impacts of human pressures on aquatic ecosystems are vast. Therefore, here we explore how different anthropogenic activities influence ecosystem balance in terms of nutrient composition and stoichiometry. We conclude that human interventions have affected the functioning of aquatic ecosystems in terms of energy flow due to stoichiometric imbalances. We also conclude that the interplay between macro and micronutrient stoichiometry might raise important axioms to predict and understand human impacts on the functioning of aquatic ecosystems.

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Section: Invasive Speciesmentioning

confidence: 97%

Human Impacts on Aquatic Ecosystems From the Lens of Ecological Stoichiometry

et al. 2022

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“…Fish predation also affects seasonal succession (Gliwicz & Pijanowska, 1989) and depth distribution (Gliwicz, 1986) of zooplankton and ‐ via cascading interactions –of phytoplankton in lakes (Hansson et al, 2004; Ogorelec et al, 2021). Consequently, changes in fish predation pressure due to the invasion of a new fish species may have pronounced effects on zooplankton assemblages (Bøhn & Amundsen, 1998; Florian et al, 2016; Nobre et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Can young‐of‐the‐year invasive fish keep up with young‐of‐the‐year native fish? A comparison of feeding rates between invasive sticklebacks and whitefish

Ogorelec

Rudstam

Straile

2022

Ecology and Evolution

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Invasion of non‐native species might alter food web structure and the strength of top‐down control within lake ecosystems. As top‐down control exerted by fish populations is often dominated by young of the year fish, the impact of new fish species might depend on the feeding rates of the juvenile fish. Here we provide comparative analyses of feeding rates of juvenile whitefish (Coregonus wartmanni) – a native and specialised planktivore and an invasive generalist (sticklebacks, Gasterosteus aculeatus). We studied feedings rates of whitefish and sticklebacks in aquaria experiments using 2 cm to 8 cm fish feeding on seven zooplankton species common to Lake Constance. As whitefish hatch several months earlier than sticklebacks, 0+ whitefish are larger than 0+ sticklebacks throughout the year and hence are predicted to have higher feeding rates on especially large zooplankton species. We show that sticklebacks as small as 2 cm were able to feed on the largest zooplankton species of Lake Constance. Further, stickleback feeding rates were similar to both the same size 0+ whitefish and the larger 0+ whitefish co‐occurring with smaller 0+ sticklebacks. Hence, 0+ sticklebacks will compete with 0+ whitefish for the same zooplankton species, therefore the invasion of sticklebacks is unlikely to change the relative feeding pressure by individual 0+ fish on zooplankton species.

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