Fish communities in the Anthropocene: detecting drivers of changes in the deep peri-alpine Lake Geneva

Anneville, Orlane; Vogel, Camille; Lobry, Jérémy; Guillard, Jean

doi:10.1080/20442041.2017.1294350

Cited by 12 publications

(16 citation statements)

References 67 publications

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“…Before the 2000s, catches were made up of only few cohorts, mainly age 2+ or 3+, while fishes older than 4 years were rare in the lake. In contrast, recent studies have shown that fish caught by French fishers in recent years are older (Anneville et al, 2017). Such a change in the age structure of the catches indicates a high level of recruitment and that the stock is not entirely harvested anymore.…”

Section: Factors Controlling Fish Communitiesmentioning

confidence: 85%

“…From 1979 to the mid-1990s, whitefish contribution remained low and catches were dominated by percids that made up 76% of the total catches (41% for perch and 35% for roach). Since the 1990s, whitefish contributions started to increase again (up to 66% in 2010-2012) accompanied by a decrease in roach contributions while perch remained high ranging from 32% to 70% (Anneville et al, 2017).…”

Section: Lake Genevamentioning

confidence: 99%

“…For recent years, CPUE values (kg/fisherman) have been computed based on French fish statistics provided by the Haute-Savoie's DDT. The available French data allowed CPUE computation per species (Anneville et al, 2017) for the period 1979-2012. As these CPUEs indicated significant correlations with the French catches (P<0.005), we assumed that French catches give a good indication of the abundance of the different targeted fish species from the whole lake.…”

Section: Lake Genevamentioning

confidence: 99%

“…In Lake Geneva, the decrease in TP concentration was accompanied by a decrease in roach and perch an increase in whitefish CPUE (Gerdeaux, 2004;Anneville et al, 2017), thus the observed switch from percid and cyprinid to coregonid dominated community could have been induced by a change in the lake's trophic status (Jeppesen et al, 2005). However, changes in species contributions to commercial landings may also reflect changes in the habits of fishers.…”

Section: Factors Controlling Fish Communitiesmentioning

confidence: 99%

“…Warmer spring temperatures allow whitefish larvae to grow faster, and provide a better temporal match with the seasonal development of their prey species (Anneville et al, 2009). In addition, a change in the age structure of the whitefish population in the 2000s also probably contributed to the increase in the population (Anneville et al, 2017). Because of the high fishing pressure, the whitefish cohort entering the stock used to be completely harvested (Caranhac and Gerdeaux, 1998).…”

Section: Factors Controlling Fish Communitiesmentioning

confidence: 99%

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Fisheries impacts on lake ecosystem structure in the context of a changing climate and trophic state

et al. 2017

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<p>Through cascading effects within lake food webs, commercial and recreational fisheries may indirectly affect the abundances of organisms at lower trophic levels, such as phytoplankton, even if they are not directly consumed. So far, interactive effects of fisheries, changing trophic state and climate upon lake ecosystems have been largely overlooked. Here we analyse case studies from five European lake basins of differing trophic states (Lake Võrtsjärv, two basins of Windermere, Lake Geneva and Lake Maggiore) with long-term limnological and fisheries data. Decreasing phosphorus concentrations (re-oligotrophication) and increasing water temperatures have been reported in all five lake basins, while phytoplankton concentration has decreased only slightly or even increased in some cases. To examine possible ecosystem-scale effects of fisheries, we analysed correlations between fish and fisheries data, and other food web components and environmental factors. Re-oligotrophication over different ranges of the trophic scale induced different fish responsesIn the deeper lakes Geneva and Maggiore, we found a stronger link between phytoplankton and planktivorous fish and thus a more important cascading top-down effect than in other lakes. This connection makes careful ecosystem-based fisheries management extremely important for maintaining high water quality in such systems. We also demonstrated that increasing water temperature might favour piscivores at low phosphorus loading, but suppresses them at high phosphorus loading and might thus either enhance or diminish the cascading top-down control over phytoplankton with strong implications for water quality.</p>

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Section: Factors Controlling Fish Communitiesmentioning

confidence: 85%

Section: Lake Genevamentioning

confidence: 99%

Section: Lake Genevamentioning

confidence: 99%

Section: Factors Controlling Fish Communitiesmentioning

confidence: 99%

Section: Factors Controlling Fish Communitiesmentioning

confidence: 99%

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Fisheries impacts on lake ecosystem structure in the context of a changing climate and trophic state

et al. 2017

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European large perialpine lakes under anthropogenic pressures and climate change: present status, research gaps and future challenges

Salmaso¹,

Anneville²,

Straile³

et al. 2018

Hydrobiologia

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The aim of this review is to introduce and critically comment the main research topics considered in a selection of papers on the European large perialpine lakes (LPL) presented at the XXXIII congress of the International Society of Limnology in 2016. Besides highlighting ongoing research advancements in the LPL, the review provides a critical overview of the scientific information available on the large lake's ecosystems, identifying a few emerging research topics (e.g., aquatic 'omics' and high frequency monitoring). Many limnological investigations are linked to the concept of scientific monitoring, following a ''problem solving'' approach connected with the management of water resources. Experimental studies and modeling are restricted to specific niches. Overall, the scientific knowledge is quite scattered, showing hot-spots of specialized or integrated research in specific lakes and areas. The advancement of new knowledge in the LPL should rely on a better integration of scientific disciplines using multidisciplinary approaches, and on the continuous adoption of new advanced technologies and tools, contributing, besides basic research, to the next generation monitoring approaches. Finally, the preservation of LPL has to rely on water protection policies addressed towards the sustainable development of

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Reframing Lake Geneva ecological trajectory in a context of multiple but asynchronous pressures

Bruel

Girardclos

Marchetto³

et al. 2021

J Paleolimnol

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There are no doubts long-term observatories provide unique insight on ecosystems trajectories. Can we use earliest data to set restoration goals? We take the example of Lake Geneva, for which descriptions of the ecosystem are available for as soon as the late 19 th and early 20 th century. Forel writes about how the luxuriant growth of plant communities provided important habitat for aquatic animals, as well as trapping nutrients and affecting water currents. It can be hard to believe Forel is referring to the same lake as present-day Lake Geneva; however, without continuous monitoring, this qualitative description can hardly be compared to recent observations. We resorted to paleolimnology to quantify the changes in plankton communities, as a proxy of general ecological changes, over the past 1,500 years. Our results show that from 563 AD (beginning of the record) to the 20 th century, the cladoceran assemblage remained stable, despite important amplitude of climate variability (3°C). Trajectory of LakeGeneva shifted for the first time in 1946. Online dynamic linear models revealed the following transition, in 1958-1961, transition was critical, i.e., the ecosystem changed state. Littoral associated species were totally lost, and the assemblage is now dominated by pelagic species. The shift took place around the beginning of the long-term monitoring program, when local perturbations (eutrophication) were escalading. Our result raises the vexing observation that the historical dataset, one of the longest records in the world, may not provide a baseline for Lake Geneva's condition.

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Fish communities in the Anthropocene: detecting drivers of changes in the deep peri-alpine Lake Geneva

Cited by 12 publications

References 67 publications

Fisheries impacts on lake ecosystem structure in the context of a changing climate and trophic state

Fisheries impacts on lake ecosystem structure in the context of a changing climate and trophic state

European large perialpine lakes under anthropogenic pressures and climate change: present status, research gaps and future challenges

Reframing Lake Geneva ecological trajectory in a context of multiple but asynchronous pressures

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