Temperature and phytoplankton size class biomass drives the zooplankton food web dynamics in the Indian Ocean sector of the Southern Ocean

Venkataramana, V.; Anilkumar, N.; Naik, Ravidas K.; Mishra, Rajani Kanta; Sabu, P.

doi:10.1007/s00300-019-02472-w

Cited by 19 publications

(6 citation statements)

References 24 publications

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“…Observations indicate that during austral summer, cold and well-mixed waters are dominated by large phytoplankton on the Kerguelen Plateau (Quéguiner, 2013). The resulting zooplankton composition is dominated by large copepods, leading to a short, energy-efficient pathway for predators (Quéguiner, 2013;Venkataramana et al, 2019). Results from our comparison between model output and environmental variables are consistent with these observations.…”

Section: Environmental Drivers Of Food Web Dynamicssupporting

confidence: 79%

Time-Dynamic Food Web Modeling to Explore Environmental Drivers of Ecosystem Change on the Kerguelen Plateau

et al. 2020

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Understanding the impacts of climate and fishing on marine systems is important for ecosystem-based management in the Southern Ocean, but can be difficult to evaluate due to patchy data in space and time. We developed the first time-dynamic food web model for the Kerguelen Plateau using Ecopath with Ecosim to explore likely drivers of change in this relatively data-poor region. The Kerguelen Plateau is located at the centre of intersecting frontal systems and is inhabited by one of the largest populations of the commercially important Patagonian toothfish. We used this model to evaluate the environmental and human drivers of food web dynamics in the region by calibrating it with French and Australian fisheries data from 1997-2018 and biomass data for the period 1986-2018. Fishing was not identified as a driver of food web dynamics within this model, which could indicate that current management strategies are sustainable. A correlation analysis with environmental parameters likely to drive food web dynamics (sea surface temperature, zonal wind, Southern Annular Mode and chlorophyll a concentration) highlighted cool sea surface temperature, higher zonal wind speeds and negative phases of the Southern Annular Mode as important drivers of change, particularly during the summer. As the Southern Ocean is predicted to warm and winds are expected to intensify under future climate change, our study illustrates the importance of considering environmental change in ecosystem management.

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Section: Environmental Drivers Of Food Web Dynamicssupporting

confidence: 79%

Time-Dynamic Food Web Modeling to Explore Environmental Drivers of Ecosystem Change on the Kerguelen Plateau

et al. 2020

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“…These findings are consistent with the observations of Asha Devi et al (2020) from the Subtropical Front (40-43°S, 52-60°E), which reveal a strong impact of eddies on productivity, food web structure and zooplankton community composition. Venkataramana et al (2019) observed a high-standing stock of small copepods in the Subtropical Front (~42°S, 57°E), transitioning to larger copepods further south in the Polar Front.…”

Section: Zooplanktonmentioning

confidence: 96%

Nutrient, phytoplankton, and zooplankton variability in the Indian Ocean

Hood,

Coles,

Huggett

et al. 2024

The Indian Ocean and Its Role in the Global Climate System

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“…Zooplankton has a key role in the aquatic trophic webs [38][39][40][41][42]. This importance is mainly related to the use of these organisms in the marine aquaculture industry, in which planktonic organisms such as rotifers and brine shrimp (Artemia sp.)…”

Section: Introductionmentioning

confidence: 99%

The Influence of Polystyrene Microspheres Abundance on Development and Feeding Behavior of Artemia salina (Linnaeus, 1758)

et al. 2021

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In the present study, it has been evaluated how 10 µm of polyethylene microspheres can be ingested by Artemia salina (Linnaeus, 1758) larvae within the first 7 days of the life cycle, and the impact on their health. Twelve A. salina larvae (instar I) groups were exposed to different microplastics (MPs) concentrations (0-1-10-102-103-104 MPs/mL), with and without Dunaliella salina as a food source. The results highlighted that A. salina larvae ingest MPs in relation to the exposure times in a dose-dependent manner and are significantly influenced by food availability. The highest contamination found was 306.2 MPs/individual at 104 MPs/mL exposure without a food source. No MPs were found in the presence of the food source from 1 to 102 MPs/mL, while contamination was detected at all concentrations of MPs without a food source. The worst effect on the developmental stages was evaluated at 168 h with a food source, with a delay compared to the control of I and II instars at 103 and 104 MPs/mL, respectively. Furthermore, microalgal feeding was significantly reduced for about 50% in the presence of 104 MPs/mL. These results highlight that aquatic microplastics pollution could affect the A. salina’s feeding behavior and life cycle.

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Temperature and phytoplankton size class biomass drives the zooplankton food web dynamics in the Indian Ocean sector of the Southern Ocean

Cited by 19 publications

References 24 publications

Time-Dynamic Food Web Modeling to Explore Environmental Drivers of Ecosystem Change on the Kerguelen Plateau

Time-Dynamic Food Web Modeling to Explore Environmental Drivers of Ecosystem Change on the Kerguelen Plateau

Nutrient, phytoplankton, and zooplankton variability in the Indian Ocean

The Influence of Polystyrene Microspheres Abundance on Development and Feeding Behavior of Artemia salina (Linnaeus, 1758)

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