Green vs brown food web: Effects of habitat type on multidimensional stability proxies for a highly-resolved Antarctic food web

Cordone, Georgina; Salinas, Vanesa; Marina, Tomás I.; Doyle, Santiago R.; Pasotti, Francesca; Saravia, Leonardo A.; Momo, Fernando

doi:10.1016/j.fooweb.2020.e00166

Cited by 28 publications

(26 citation statements)

References 127 publications

(134 reference statements)

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“…Potter Cove had each of the four modules associated to an independent type of basal resource (1-macroalgae, 2-aged detritus, 3fresh detritus/necromass/diatoms and 4-phytoplankton) with different habitats. These results support the important role energy pathways and habitat type play in structuring Antarctic food webs (Cordone et al 2020). This pattern was not evident for Beagle Channel.…”

Section: Food Web Differencessupporting

confidence: 77%

“…In order to perform a statistically robust comparison between food webs, we used the Strona Curveball algorithm (Strona et al 2014) to generate an ecological meaningful distribution of the metrics (Cordone et al 2020;Kéfi et al 2016). It randomizes the network structure maintaining the number of prey and predators for each species, meaning that species have the same degree, but allow them to interact with different species than in the original network.…”

Section: Food Web Structure and Stability Comparison Using A Randomization Algorithmmentioning

confidence: 99%

“…In theory, exponential networks such as Potter Cove's, can be catastrophically fragmented by random removal of nodes (Albert, Jeong, and Barabási 2000). However, Cordone et al, (2018Cordone et al, ( , 2020 simulated species extinction for Potter Cove and found no food web collapse, suggesting an apparent robustness to species loss. Our stability analysis supports their conclusion, as Potter Cove food web displayed significantly higher stability (lower QSS), meaning that it has a higher probability to recover after a perturbation, such as a local loss of a species, than the Beagle Channel food web.…”

Section: Food Web Differencesmentioning

confidence: 99%

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Marine food webs are more complex but less stable in sub-Antarctic than in Antarctic regions

Rodriguez

Marina

Schloss

et al. 2021

Preprint

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Aim: Food web structure plays an important role in determining ecosystem stability to perturbations. High latitude marine ecosystems are being affected by environmental stressors and ecological shifts. In the West Antarctic Peninsula these transformations are driven by climate change, and in the sub-Antarctic region by anthropogenic activities. Understanding the differences between these areas is necessary to monitor the changes that are expected to occur in the upcoming decades. Here, we compared the structure and stability of Antarctic and sub-Antarctic marine food webs. Location: Antarctic (Potter Cove, 25 de Mayo/King George Island, West Antarctic Peninsula) and sub-Antarctic (Beagle Channel, Tierra del Fuego, South America) regions. Time period: 1965 - 2019. Major taxa studied: from phytoplankton to fish. Methods: We compiled species trophic (predator-prey) interactions and calculated complexity (number of species and interactions, connectance), structure (mean trophic level, omnivory, degree distribution, modularity, species roles and traits) and stability (QSS) metrics. To be able to make statistical comparisons, we used a randomization algorithm (Strona Curveball) maintaining the number of prey and predators for each species and calculated metrics for each simulation. Results: The Beagle Channel food web presented higher values for complexity metrics (number of species and interactions), structure (mean trophic level, omnivory, modularity) but lower stability (QSS). Potter Cove fitted the exponential degree distribution, while Beagle Channel the power-law with exponential cutoff model. Both food webs presented the same connectance value (0.05), similar distribution of species in top, intermediate and top positions and topological roles, with only one network connector each. Main conclusions: Our results showed that Beagle Channel food web is more complex, but less stable and sensitive to the loss of its most connected species. While the Potter Cove food web presented less complexity and greater stability to perturbations.

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Section: Food Web Differencessupporting

confidence: 77%

Section: Food Web Structure and Stability Comparison Using A Randomization Algorithmmentioning

confidence: 99%

Section: Food Web Differencesmentioning

confidence: 99%

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Marine food webs are more complex but less stable in sub-Antarctic than in Antarctic regions

Rodriguez

Marina

Schloss

et al. 2021

Preprint

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“…Most Southern Ocean species have broad distributions with trophic interactions varying across seasons, regions, and habitats. Such variation impacts trajectories of network reorganisation following disturbances, illustrating the importance of accounting for spatial heterogeneity (Cordone et al, 2020; also see Section " Ecological Network Models" and Box 1 for a description of ecological networks and network modelling in a food web context). Whilst it is impossible to empirically document the spatial variability and scales of all trophic interactions across the Southern Ocean, significant progress has been made in recent decades toward characterising Southern Ocean food webs at a regional scale (see Figure 1 for locations).…”

Section: Introductionmentioning

confidence: 99%

Southern Ocean Food Web Modelling: Progress, Prognoses, and Future Priorities for Research and Policy Makers

et al. 2021

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“…Microbial organisms comprise 14% of all existing biomass on Earth (Bar-On et al, 2018;Flemming & Wuertz, 2019), while the entirety of the Animal Kingdom, for comparison, only represents 0.3% (Bar-On et al, 2018). Microbial decomposition is responsible for the recycling of organic matter back into food webs, thus partly subsidizing the flux of energy and matter in all ecosystems (Cordone et al, 2020;Mougi, 2020). Through respiration and decomposition of existing carbon pools, microorganisms are largely regarded as one of the most important biotic controls of the global carbon cycle (Bardgett et al, 2008;Gougoulias et al, 2014;Jansson & Hofmockel, 2020;Schimel & Schaeffer, 2012;Wang, 2018).…”

Section: Introductionmentioning

confidence: 99%

Predation by protists influences the temperature response of microbial communities

Rocca

Yammine

Simonin

et al. 2021

Preprint

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Temperature strongly influences microbial community structure and function, which in turn contributes to the global carbon cycle that can fuel further warming. Recent studies suggest that biotic interactions amongst microbes may play an important role in determining the temperature responses of these communities. However, how microbial predation regulates these communities under future climates is still poorly understood. Here we assess whether predation by one of the most important bacterial consumers globally, protists, influences the temperature response of a freshwater microbial community structure and function. To do so, we exposed these microbial communities to two cosmopolitan species of protists at two different temperatures, in a month-long microcosm experiment. While microbial biomass and respiration increased with temperature due to shifts in microbial community structure, these responses changed over time and in the presence of protist predators. Protists influenced microbial biomass and function through effects on community structure, and predation actually reduced microbial respiration rate at elevated temperature. Indicator species and threshold indicator taxa analyses showed that these predation effects were mostly determined by phylum-specific bacterial responses to protist density and cell size. Our study supports previous findings that temperature is an important driver of microbial communities, but also demonstrates that predation can mediate these responses to warming, with important consequences for the global carbon cycle and future warming.

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Green vs brown food web: Effects of habitat type on multidimensional stability proxies for a highly-resolved Antarctic food web

Abstract: Please cite this article as: G. Cordone, V. Salinas, T.I. Marina, et al., Green vs brown food web: Effects of habitat type on multidimensional stability proxies for a highly-resolved Antarctic food web, Food Webs (2020),

Cited by 28 publications

References 127 publications

Marine food webs are more complex but less stable in sub-Antarctic than in Antarctic regions

Marine food webs are more complex but less stable in sub-Antarctic than in Antarctic regions

Southern Ocean Food Web Modelling: Progress, Prognoses, and Future Priorities for Research and Policy Makers

Predation by protists influences the temperature response of microbial communities

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