Marine food webs are more complex but less stable in sub-Antarctic (Beagle Channel, Argentina) than in Antarctic (Potter Cove, Antarctic Peninsula) regions

Rodriguez, Iara Diamela; Marina, Tomás I.; Schloss, Irene R; Saravia, Leonardo A.

doi:10.1016/j.marenvres.2022.105561

Cited by 24 publications

(35 citation statements)

References 90 publications

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“…Understanding the differences and similarities between the northern and southern hemispheres is necessary to monitor the changes that are occurring and are expected in the coming decades (Timmermann et al, 2015;Rodriguez et al, 2022). In the present study, Tintinnina diversity in both NASG and SASG was very high, encompassing 142 and 124 Tintinnina species, respectively.…”

Section: Differences Of Tintinnina Assemblages In Nasg and Sasgmentioning

confidence: 57%

Organization of planktonic Tintinnina assemblages in the Atlantic Ocean

Tarran²,

Dall’Olmo³

et al. 2023

Front. Mar. Sci.

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Marine plankton have different biogeographical distribution patterns. However, it is not clear how the entire plankton assemblage is composed of these species with distinct biogeographical patterns. Tintinnina (tintinnids) is single-celled planktonic protozoa commonly used as model organisms in planktonic studies. In this research, we investigated the organization of Tintinnina assemblages along the Atlantic Meridional Transect (AMT) spanning over 90 degrees of latitude during the 29th AMT cruise (2019). Tintinnina with high frequency of occurrence was classified into four biogeographic distribution patterns (equatorial, gyre, frontal, and deep Chl a maximum) according to their vertical and horizontal distribution. All species falling within each distribution pattern formed a sub-assemblage. Equatorial sub-assemblage dominated in upper waters of the equatorial zone and gyre centres. Equatorial and frontal sub-assemblages co-dominated in upper waters of the frontal zones. Deep Chlorophyll a maximum Layer (DCM) sub-assemblage dominated in the DCM waters. Some Tintinnina species with high abundance could be used as indicator species of sub-assemblages. The Tintinnina assemblages in the northern and southern hemispheres exhibited asymmetry in terms of species composition. The latitudinal gradient of Tintinnina species richness was bimodal, which was shaped by the superposition of the species number of the four sub-assemblages with latitude. The result of this study contributes to the understanding of Tintinnina assemblage in the equatorial zone and subtropical gyres of the Pacific and Indian Ocean. It is also valuable for predicting the influence of global warming on changes in Tintinnina distribution and species richness.

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Section: Differences Of Tintinnina Assemblages In Nasg and Sasgmentioning

confidence: 57%

Organization of planktonic Tintinnina assemblages in the Atlantic Ocean

Tarran²,

Dall’Olmo³

et al. 2023

Front. Mar. Sci.

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“…3 ) since they were generalists and omnivores ( 47 ). A greater number of species and longer food chains can be sustained, which correlates positively with omnivory, in which species have a higher chance of encountering prey in various habitats ( 13 ).…”

Section: Discussionmentioning

confidence: 99%

“…Notably, the habitat type plays a vital role in shaping the structure and stability of Antarctic food webs ( 10 ), whereas temperature was previously believed to have a positive correlation with food web complexity (connectivity) and omnivory and trophic levels ( 11 , 12 ). Climate change and anthropogenic activities have led to more complex food webs in the Beagle Channel; however, the food webs are less stable than those in Potter Cove ( 13 ). As biotic factors, generalist top predators have enhanced the stability of food webs ( 14 ), while trophic coherence has been a determining factor for food web stability ( 15 ).…”

Section: Introductionmentioning

confidence: 99%

Predation has a significant impact on the complexity and stability of microbial food webs in subalpine lakes

Guo,

Li,

Liu

et al. 2023

Microbiol Spectr

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Microbial food webs are drivers of material circulation and energy flow in lake ecosystems. The structural shifting of microbial food webs has important implications for the function of lake ecosystems. However, we continue to lack a clear understanding of the mechanisms underlying the complexity and stability of microbial food web structures. In this study, we investigated the diversity and structure of protist communities and bacterial communities by using DNA meta-barcoding to reveal the key factors affecting the complexity and stability of microbial food webs in subalpine lakes. Our analysis shows that significant seasonal variations occurred in protist taxonomic and functional communities (e.g., algivores, bacterivores, and phototrophs), which were mainly controlled by hydrological and nutrient parameters such as temperature, pH, and NH 4 + -N. Based on the network approach, the most complex food webs in the summer exhibited the lowest stability. We also found that the trophic interaction between bacterivorous protozoans and bacteria was the main factor significantly having influence on microbial food web complexity and stability ( P < 0.01). Moreover, biotic factors (i.e., bacterivorous protozoan composition) were better predictors of the relative abundance of several bacteria (Proteobacteria and Cyanobacteria) as prey than abiotic factors. Thus, these results suggest that predation is essential for the complexity and stability of the microbial food webs in lake ecosystems. Our findings suggest that understanding these complex interactions of microbial food webs is critical for ecosystem management and for predicting the ecological consequences of future climate changes in aquatic ecosystems. IMPORTANCE As an important part of microbial food webs, protists transfer organic carbon and nutrients to higher trophic levels in aquatic ecosystems. Protist predation often influences the abundance and composition of bacterial communities. However, we still do not understand whether and how predation affects the complexity and stability of microbial food webs. This study assessed the seasonal dynamic characteristics and driving factors of microbial food webs in terms of complexity and stability. Our findings have implications for future surveys to reveal the effects of climate and environmental changes.

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“…The presence of the physically complex and variable intertidal zone, and the fluctuating environmental conditions may promote the differentiation of ecological niches. This could drive the diversity of energy channels centred around different types of basal resources, supporting species with a mix of foraging behaviours, mobilities, and habitat traits (Gauzens et al, 2015;Rodriguez et al, 2022).…”

Section: Drivers Of Structural Differencesmentioning

confidence: 99%

“…Mobility and feeding mode also contribute to the trophic role of species within networks, by determining their activity levels and the types of resources they consume (Lazzaro et al, 2009;Gilabert et al, 2019). In fact, it has been proposed that modules in some networks represent semi-isolated energy channels, whereby energy flows from a distinct set of basal resources to an assemblage of higher consumers with a particular set of functional traits (Gauzens et al, 2015;Rodriguez et al, 2022). Clearly, despite the consensus that modularity acts to stabilise food webs, there are contrasting viewpoints on what the key determinants of modularity are and how modules are distributed within communities.…”

Section: Introductionmentioning

confidence: 99%

Trophic structuring of modularity alters energy flow through marine food webs

Eskuche-Keith

Hill²,

Hollyman³

et al. 2023

Front. Mar. Sci.

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Food web interactions govern how ecosystems respond to climate change and biodiversity loss. Modularity, where subgroups of species interact more often with each other than with species outside their subgroup, is a key structural feature which has been linked to food web stability. We sought to address the lack of understanding of how modularity varies among ecosystems by comparing the structure of four highly resolved marine food webs, using a simulated annealing algorithm to identify network modules and Random Forest models to predict the distribution of species across modules based on a set of eight functional traits. Modules in two offshore networks were partitioned largely by trophic level, creating an interdependence among them, whereas modules in two semi-enclosed bays were generally separated into energy channels with less trophic separation and containing distinct basal resources, providing greater redundancy in the flow of energy through the network. Foraging habitat and mobility predicted module membership in all networks, whilst body mass and foraging strategy also differentiated modules in the offshore and bay ecosystems, respectively. Environmental heterogeneity may be a key factor driving the differences in modularity and the relative importance of functional traits for predicting module membership. Our results indicate that, in addition to overall network modularity, the trophic structure of modules within food webs should be considered when making inferences about ecosystem stability.

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Marine food webs are more complex but less stable in sub-Antarctic (Beagle Channel, Argentina) than in Antarctic (Potter Cove, Antarctic Peninsula) regions

Cited by 24 publications

References 90 publications

Organization of planktonic Tintinnina assemblages in the Atlantic Ocean

Organization of planktonic Tintinnina assemblages in the Atlantic Ocean

Predation has a significant impact on the complexity and stability of microbial food webs in subalpine lakes

Trophic structuring of modularity alters energy flow through marine food webs

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