Inter-annual climate variability and zooplankton: applying teleconnection indices to two deep subalpine lakes in Italy

Manca, Marina; Rogora, Michela; Salmaso, Nico

doi:10.4081/jlimnol.2014.1014

Cited by 11 publications

(22 citation statements)

References 49 publications

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“…The effect of TP TURN on Daphnia confirms what observed in other deep subalpine lakes, where phosphorus availability positively influences Daphnia population growth in spring, e.g. leading to higher population densities of Daphnia after complete vertical mixing events (Leoni et al, ; Manca et al, ). These peaks have been attributed to greater phosphorus replenishment in epilimnion, which can improve food quality for grazers and in particular for Daphnia (Gulati & Demott, ; Leoni et al, ).…”

Section: Discussionsupporting

confidence: 81%

“…These complex interrelations between weather, maximum depth of mixing, phosphorus replenishment, and plankton succession are well documented for oligomictic and meromictic lakes located at the edge of the Alps (Leoni, Nava, & Patelli, 2018;Manca, Rogora, & Salmaso, 2015;Salmaso et al, 2013;Straile, 2000). In short, in these lakes cold and windy winters lead to greater vertical mixing during late-winter turnovers and greater replenishment of phosphorus in the epilimnion (Leoni, Garibaldi, & Gulati, 2014;Lepori, Bartosiewicz, Simona, & Veronesi, 2018;Salmaso et al, 2013;Straile, 2000).…”

Section: Introductionmentioning

confidence: 95%

“…In short, in these lakes cold and windy winters lead to greater vertical mixing during late‐winter turnovers and greater replenishment of phosphorus in the epilimnion (Leoni, Garibaldi, & Gulati, ; Lepori, Bartosiewicz, Simona, & Veronesi, ; Salmaso et al, ; Straile, ). The replenishment of epilimnetic phosphorus is thought to be important to the development of Daphnia population in spring (Leoni et al, ; Manca et al, ) because a greater replenishment is expected to increase food (phytoplankton) production (Manca et al, ) and/or improve phytoplankton nutritional quality (Anneville, Gammeter, & Straile, ; Salmaso et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Causes of Daphnia midsummer decline in two deep meromictic subalpine lakes

2019

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Daphnia are key organisms in pelagic food webs, acting as a food resource for fish and predatory zooplankton and regulating phytoplankton through grazing. Its population dynamic follows regular seasonal patterns, with spring peaks followed by summer population declines (midsummer declines, MSDs). Midsummer declines show high inter‐annual variation, which has been attributed to different causes. However, the mechanisms controlling the MSD remain poorly understood, especially in deep stratified lakes. We tried to disentangle the factors causing Daphnia MSDs in Lake Lugano and Lake Iseo (in Switzerland and Italy), two deep peri‐alpine lakes with similar trophic status and vertical mixing dynamics, characterised by phosphorus accumulation in the hypolimnion and variable mixing during late‐winter turnovers. Specifically, we assessed the effects of three different hypothetical pathways according to which: (1) winter air temperature controls MSDs by influencing mixing depth during turnovers and epilimnetic phosphorus replenishment; (2) vernal air temperature influences MSD by accelerating the timing of spring population peak; and (3) summer temperature influences MSDs by increasing fish predation. We assessed the relative strength of these pathways using structural equation modelling on long‐term datasets for the two lakes (29 years for Lake Lugano and 19 years for Lake Iseo). Between the hypothesised pathways, the one driven by winter air temperature (through P replenishment) influenced Daphnia abundance in spring in both lakes, but the effects propagated to summer Daphnia abundance only in Lake Lugano. Additionally, summer Daphnia abundance was influenced by the summer air temperature through a positive (although weak) effect. By comparison, vernal air temperature had no detectable effects on summer Daphnia abundance. The results revealed marked differences between the meromictic study lakes and the shallow hypertrophic water bodies that were the focus of previous research on Daphnia MSD, and also between the two study lakes. The influence of epilimnetic P replenishment on the summer Daphnia abundance in Lake Lugano, which was recovering from past eutrophication, may have reflected the greater susceptibility of deep, stratified lakes to P depletion after spring compared to shallow hypertrophic lakes or reservoirs. This effect might not have been detected in Lake Iseo because P was more consistently depleted during the study period (i.e. variance in the predictor was too low to detect an effect). This study highlighted the complexity of the effects of climate variability on Daphnia MSD in deep lakes, showing that the responses can differ even between two neighbouring lakes with similar vertical mixing dynamics and trophic status. At the same time, the results suggest that future increases in winter air temperature, caused by global warming, may cause critically low densities of Daphnia during spring and summer and compromise the ability of zooplankton to control phytoplankton biomass.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Causes of Daphnia midsummer decline in two deep meromictic subalpine lakes

2019

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“…Peak abundance in November 2014 was higher than the maximum peak previously recorded in the cool June 2013 (Rossi et al, 2014). The shift in D. pulex population phenology, which seasonal growth started earlier and lasted longer, may be linked to a direct or indirect effect of winter temperature rise (Manca and DeMott, 2009;Manca, 2011;Manca et al, 2015). Warming may promote initial population growth by increasing fecundity per se and may be regarded as a factor able to worsen the effects of eutrophication (Schindler, 2001;Winder and Sommer, 2012).…”

Section: Discussionmentioning

confidence: 91%

“…Warming may promote initial population growth by increasing fecundity per se and may be regarded as a factor able to worsen the effects of eutrophication (Schindler, 2001;Winder and Sommer, 2012). Peak density level may be positively correlated with increase of nutrient concentration and of food sources (Schalau et al, 2008;Manca et al, 2015). Hatching cues and associated emergence dynamics from resting stage have been given minor attention but winter warming may alter the interaction between photoperiod and temperature, and have direct, different effects on the emerging population of Daphnia (Vadadi-Fülöp and Hufnagel, 2014).…”

Section: Discussionmentioning

confidence: 99%

Phenology of Daphnia in a Northern Italy pond during the weather anomalous 2014

et al. 2015

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Cladocera paleocommunity to disentangle the impact of anthropogenic and climatic stressors on a deep subalpine lake ecosystem (Lake Iseo, Italy)

et al. 2021

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In big lakes with strong anthropogenic pressure, it is usually difficult to disentangle the impacts of climate variability from those driven by eutrophication. The present work aimed at the reconstruction of change in the species distribution and density of subfossil Cladocera in Lake Iseo (Italy) in relation to climate and anthropogenic pressure. We related subfossil Cladocera species composition and density in an 80-cm sediment core collected in the pelagic zone of Lake Iseo to long-term temperature trends and phosphorus concentration inferred by diatoms frustules. The Cladocera remains detected in Lake Iseo sediment reflected the species composition and density of modern pelagic Cladocera assemblages. Cladocera rapidly respond to environmental change, and that climate change combined with eutrophication can induce changes in community composition and species density. At the beginning of twentieth century, when global warming was not yet so accentuated, the nutrient increase in water resulted as the principal driver in determining the long-term development of plankton communities and pelagic food web structure. Moreover, catchment-related processes may decisively affect both species composition and density of the lake planktonic communities due to the decrease of lake water transparency induced by input of inorganic material from the catchment area to the lake. The paleolimnological investigation, through the combined study of biotic and abiotic factor, allowed clarifying the synergic effects of the most important drivers of change in lake ecosystems, suggesting that climatic factors should be considered with nutrient availability as determinant element in controlling the temporal development of plankton communities and pelagic food web structure.

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Inter-annual climate variability and zooplankton: applying teleconnection indices to two deep subalpine lakes in Italy

Abstract: Investigating relation between meteo-climatic indices and between-year variation in

Cited by 11 publications

References 49 publications

Causes of Daphnia midsummer decline in two deep meromictic subalpine lakes

Causes of Daphnia midsummer decline in two deep meromictic subalpine lakes

Phenology of Daphnia in a Northern Italy pond during the weather anomalous 2014

Cladocera paleocommunity to disentangle the impact of anthropogenic and climatic stressors on a deep subalpine lake ecosystem (Lake Iseo, Italy)

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