scholarly journals Phytoplankton functional traits and seston stable isotopes signature: a functional-based approach in a deep, subalpine lake, Lake Maggiore (N. Italy)

2012 ◽  
Vol 71 (1) ◽  
pp. 8 ◽  
Author(s):  
Rossana Caroni ◽  
Gary Free ◽  
Anna Visconti ◽  
Marina Manca
Keyword(s):  
Stable Isotopes ◽  
Functional Traits ◽  
Lake Maggiore ◽  
Subalpine Lake

scholarly journals Picocyanobacterial community structure and space-time dynamics in the subalpine Lake Maggiore (N. Italy)

2012 ◽  
Vol 71 (1) ◽  
pp. 9 ◽  
Author(s):  
Cristiana Callieri ◽  
Emanuele Caravati ◽  
Gianluca Corno ◽  
Roberto Bertoni
Keyword(s):  
Community Structure ◽  
Space Time ◽  
Time Dynamics ◽  
Lake Maggiore ◽  
Subalpine Lake

scholarly journals Model simulations of the ecological dynamics induced by climate and nutrient load changes for deep subalpine Lake Maggiore (Italy/Switzerland)

2020 ◽  
Author(s):  
Andrea Fenocchi ◽  
Michela Rogora ◽  
Aldo Marchetto ◽  
Stefano Sibilla ◽  
Claudia Dresti
Keyword(s):  
Climate Change ◽  
Temporal Dynamics ◽  
Numerical Models ◽  
Ghg Emissions ◽  
Climate Change Scenarios ◽  
Nutrient Loads ◽  
Nutrient Input ◽  
Lake Ecosystems ◽  
Lake Maggiore ◽  
Subalpine Lake

Climate warming affects lake ecosystems both through its direct effect on the phenology of species and through the alteration of the physical and chemical environments, which in turn affect community composition. In deep lakes, stratification enhancement and mixing reduction have already been observed, leading to hypolimnetic anoxia and to the rise of cyanophytes. The increase in stability depends on the rise of air temperature due to global emissions of greenhouse gases (GHG). Primary production could then either increase with rising epilimnetic temperature and buoyancy or decrease as fewer nutrients are upwelled from deep layers. The prevailing outcome, as well as the quantitative and temporal dynamics of all climate-induced modifications, depend on the specific lake characteristics. Individual analyses are then needed, one-dimensional coupled hydrodynamic-ecological numerical models being suitable tools for such predictions. Here, we simulated with GLM-AED2 (General Lake Model – Aquatic EcoDynamics) the 2020-2085 dynamics of the oligomictic and oligotrophic deep subalpine Lake Maggiore (Italy/Switzerland), according to the Swiss Climate Change Scenarios CH2011. Multiple realisations were performed for each scenario with random meteorological series obtained from the Vector-Autoregressive Weather Generator (VG), highlighting the uncertainties related to meteorology. Increase and decrease of nutrient loads were also tested. Results show that anoxia would occur in the hypolimnion regardless of nutrient input reduction, unless global GHG emissions were immediately reduced. Total phytoplankton biomass would be weakly affected by climate change, strongly depending on nutrient input, yet water warming would cause cyanophytes to compete with diatoms. Therefore, the fate of Lake Maggiore would be tied to both global and local environmental policies.

Disentangling the role of shared ancestry and the environment on leaf stable isotopes

2019 ◽  
Author(s):  
Marko J. Spasojevic ◽  
Sören Weber1
Keyword(s):  
Stable Isotopes ◽  
Environmental Conditions ◽  
Evolutionary History ◽  
Environmental Control ◽  
Phylogenetic Signal ◽  
Individual Species ◽  
Habitat Types ◽  
Δ13c And Δ15n ◽  
Environmental Controls ◽  
Shared Ancestry

Stable carbon (C) and nitrogen (N) isotopes in plants are important indicators of plant water use efficiency and N acquisition strategies. While often regarded as being under environmental control, there is growing evidence that evolutionary history may also shape variation in stable isotope ratios (δ13C and δ15N) among plant species. Here we examined patterns of foliar δ13C and δ15N in alpine tundra for 59 species in 20 plant families. To assess the importance of environmental controls and evolutionary history, we examined if average δ13C and δ15N predictably differed among habitat types, if individual species exhibited intraspecific trait variation (ITV) in δ13C and δ15N, and if there were a significant phylogenetic signal in δ13C and δ15N. We found that variation among habitat types in both δ13C and δ15N mirrored well-known patterns of water and nitrogen limitation. Conversely, we also found that 40% of species exhibited no ITV in δ13C and 35% of species exhibited no ITV in δ15N, suggesting that some species are under stronger evolutionary control. However, we only found a modest signal of phylogenetic conservatism in δ13C and no phylogenetic signal in δ15N suggesting that shared ancestry is a weaker driver of tundra wide variation in stable isotopes. Together, our results suggest that both evolutionary history and local environmental conditions play a role in determining variation in δ13C and δ15N and that considering both factors can help with interpreting isotope patterns in nature and with predicting which species may be able to respond to rapidly changing environmental conditions.

LBA-ECO CD-02 CARBON, NITROGEN, OXYGEN STABLE ISOTOPES IN ORGANIC MATERIAL, BRAZIL

2010 ◽  
Author(s):  
J. BERRY, ◽  
C. COOK, ◽  
T.F. DOMINGUES, ◽  
J. EHLERINGER, ◽  
L. FLANAGAN, ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Organic Material ◽  
Oxygen Stable Isotopes
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