Spatiotemporal dynamics of C and N isotopic signature of zooplankton: a seasonal study on a man-made lake in the Mediterranean region

Fadda, Amedeo; Rawcliffe, R. D.; Padedda, Bachisio Mario; Lugliè, Antonella Gesuina Laura; Sechi, Nicola; Camin, Federica; Ziller, Luca; Manca, Marina

doi:10.1051/limn/2014022

Cited by 8 publications

(8 citation statements)

References 54 publications

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“…Hydrology, SPM and isotopic ratios SC was strongly affected by WLFs throughout the year (Fadda et al, 2014), with a clear seasonality as is generally reported for reservoirs in the Mediterranean area (Naselli-Flores, 2003;Geraldes and Boavida, 2005; Naselli-Flores and Barone, 2005). The lowest water level was reached in the autumn months (October and December) at the end of the driest period, and because of the constant year-round water withdrawal (Fig.…”

Section: Discussionsupporting

confidence: 53%

Study on the suspended particulate matter of a Mediterranean artificial lake (Sos Canales Lake) using Stable Isotope Analysis of carbon and nitrogen

Fadda

Manca

Camin

et al. 2016

Ann. Limnol. - Int. J. Lim.

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Stable isotope analysis of carbon (C) and nitrogen (N) was used to study the nature and origin of the suspended particulate matter (SPM) in a small Mediterranean reservoir, Lake Sos Canales (SC). The d 13 C and d 15 N isotopic ratios, physical-chemical parameters, nutrients and phytoplankton were analyzed ca. monthly over a hydrological year on the vertical profile at two stations (lacustrine and riverine). SPM quantity and composition were related to the hydrological annual dynamic. In Mediterranean reservoirs, water-level fluctuation is one of the most important stressors, largely dependent on the strong seasonality of climate and water exploitation for human uses. Mediterranean reservoirs show different phases during a hydrological year, alternating empty and low water level (summer-autumn), re-filling (winter-spring) and high water (spring-summer) phases. Isotopic ratios of C and N were similar on the vertical profile and at the two stations during the low water phase, but differed during the re-filling and high water phases. Significant correlations were found between d 15 N and water level, and between d 13 C and temperature in the surface layer at the lacustrine station. An unusual d 13 C distribution along the water column during the re-filling phase was interpreted on the basis of phytoplankton species composition, mainly due by Gymnodinium uberrimum.

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Section: Discussionsupporting

confidence: 53%

Study on the suspended particulate matter of a Mediterranean artificial lake (Sos Canales Lake) using Stable Isotope Analysis of carbon and nitrogen

Fadda

Manca

Camin

et al. 2016

Ann. Limnol. - Int. J. Lim.

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“…∆ 15 N enrichment confirms some traits found in other lakes, independently from their size, typology, and trophy. In particular, cyclopoids were the most enriched in all but Lake Endine, in which the diaptomids were more enriched than the cyclopoids [20]. The small seasonal variability of δ 15 N signature also suggests a small plasticity in trophic position in all lakes but Pusiano, the hypereutrophic lake.…”

Section: Discussionmentioning

confidence: 91%

“…Carbon fractionation with respect to seston is therefore negligible, and seasonal changes in Daphnia carbon signature entirely overlap those of phytoplankton, thus providing a reliable pelagic baseline [6,8,[33][34][35]. Changes in carbon baseline signature with thermal stratification in turn reflect changes in taxa composition and carbon dynamics of phytoplankton in the upper water layers [6,20,21]. According to this interpretation, also in lakes Pusiano and Moro, summer thermal stratification led to increased contribution of the upper layers to phytoplankton production in summer.…”

Section: Discussionmentioning

confidence: 99%

“…On each date, Daphnia signatures identified lake-specific pelagic baseline, representing timespecific signature of seston particles (in a range 1.2-50 µm), fueling the pelagic food web [5,6,8,12,[20][21][22]. Taxa-specific signatures were referred to time-specific baseline signatures, allowing for tracing seasonal changes of deeper vs. more surficial carbon sources and relative position in the food web.…”

Section: Zooplankton Sampling and Siamentioning

confidence: 99%

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Carbon and Nitrogen Isotopic Signatures of Zooplankton Taxa in Five Small Subalpine Lakes along a Trophic Gradient

Piscia

Boggio

Bettinetti

et al. 2018

Water

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Interest in Stable Isotopes Analyses (SIA) is increasing in freshwater ecology to better clarify ecosystems' functioning. By measuring carbon and nitrogen isotopic signatures, food sources and organism trophic levels can be tracked, providing quantitative estimates of bi-dimensional niches. In order to describe some general patterns of carbon and nitrogen stable isotope signatures in lakes, we applied SIA to zooplankton community in five subalpine lakes sampled in spring and summer along a trophic gradient (from oligotrophy to hypereutrophy). Within zooplankton taxa, temporal variation in food sources and trophic levels were compared to find out taxon-specific patterns. Carbon and nitrogen isotopic signatures differed among the five lakes, reflecting depth, topography, and trophic status of the lakes. Carbon isotopic signatures varied more considerably in deeper and larger lakes (Mergozzo and Pusiano) than in a shallower and smaller lake (Lake Endine). Nitrogen isotopic signatures were generally more enriched in lakes Pusiano and Moro than in Lake Mergozzo, whereas in summer, they were depleted in all lakes. These observations indicate that zooplankton taxa specific trophic roles differed among lakes and in time.

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“…In this study, seasonality was also observed in isotopic carbon and nitrogen zooplankton signatures. In pelagic zooplankton, δ 13 C% tended toward less depleted values in summer, likely mirroring phytoplankton isotopic signatures [38,39,50]. During thermal stratification, the high growth rates of phytoplankton cells can lead to the consumption of dissolved atmospheric CO 2 , causing a shift in carbon exploitation sources toward the uptake of the HCO 3 − ion [51][52][53][54].…”

Section: Discussionmentioning

confidence: 93%

Stable Isotope Analysis and Persistent Organic Pollutants in Crustacean Zooplankton: The Role of Size and Seasonality

Piscia

Mazzoni

Bettinetti

et al. 2019

Water

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Zooplankton is crucial for the transfer of matter, energy, and pollutants through aquatic food webs. Primary and secondary consumers contribute to the abundance and standing stock biomass, which both vary seasonally. By means of taxa- and size-specific carbon and nitrogen stable isotope analysis, the path of pollutants through zooplankton is traced and seasonal changes are addressed, in an effort to understand pollutant dynamics in the pelagic food web. We analyzed zooplankton plurennial changes in concentration of polychlorinated biphenyls (PCBs) and dichlorodiphenyltrichloroethane and its relatives (DDTs) and in taxa-specific δ15N signatures in two size fractions, ≥450 µm and ≥850 µm, representative of the major part of zooplankton standing stock biomass and of the fraction to which fish predation is mainly directed, respectively. Our work is aimed at verifying: (1) A link between nitrogen isotopic signatures and pollutant concentrations; (2) the predominance of size versus seasonality for concentration of pollutants; and (3) the contribution of secondary versus primary consumers to carbon and nitrogen isotopic signatures. We found a prevalence of seasonality versus size in pollutant concentrations and isotopic signatures. The taxa-specific δ15N results correlated to pollutant concentrations, by means of taxa contribution to standing stock biomass and δ15N isotopic signatures. This is a step forward to understanding the taxa-specific role in pollutant transfer to planktivores and of zooplankton enrichment in PCBs and DDTs.

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Spatiotemporal dynamics of C and N isotopic signature of zooplankton: a seasonal study on a man-made lake in the Mediterranean region

Cited by 8 publications

References 54 publications

Study on the suspended particulate matter of a Mediterranean artificial lake (Sos Canales Lake) using Stable Isotope Analysis of carbon and nitrogen

Study on the suspended particulate matter of a Mediterranean artificial lake (Sos Canales Lake) using Stable Isotope Analysis of carbon and nitrogen

Carbon and Nitrogen Isotopic Signatures of Zooplankton Taxa in Five Small Subalpine Lakes along a Trophic Gradient

Stable Isotope Analysis and Persistent Organic Pollutants in Crustacean Zooplankton: The Role of Size and Seasonality

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