Zooplankton abundance and distribution along the Mawson coast, East Antarctica DOI Creative Commons
Christine K. Weldrick, M Brasier, Alicia L. Burns

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: Nov. 22, 2024

During the summer of 2021, we conducted a comprehensive study on zooplankton communities along East Antarctica (55°E to 80°E) as part Trends in Euphausiids off Mawson, Predators, and Oceanography (TEMPO) survey program. Hierarchical agglomerative clustering identified three distinct clusters based environmental factors. Seven potential indicator taxa associated with specific include copepods, pteropods, amphipods, euphausiids. Mainly consisting small chaetognaths foraminifera, Cluster 1 ( n = 34) was characterized by highest abundance (74,386 ind./1000 m 3 ), spanning wide latitudinal longitudinal gradients, deeper waters (mean depth 3,475 ± 739 m), higher chlorophyll- concentrations 49.13 mg −2 24.38 ). 2 4) featured lowest (1,059 ) fewest sampling stations narrowest range. Copepods, euphausiids, foraminifera were among most abundant this group. 10), located near ice edge, displayed temperature range (−1.46°C 1.18°C) moderate (22,629 ostracods. IndVal analysis seven species indicators conditions Generalized Additive Models (GAMs) used model their abundance, well total abundance. Across all models, significant drivers included , temperature, number days since sea melt mixed layer depth. The for explained 70.9% deviance, concentration emerging strongest predictors. These findings provide crucial insights into ecological implications changing climate repercussions broader Southern Ocean ecosystem. This research enhances our understanding intricate relationship between shifts ecology.

Language: Английский

Variability and uncertainty associated to methods for estimating diet composition: The case of Champsocephalus gunnari in the South Orkney Islands DOI
Jose Antonio Canseco,

L. Chavez,

Edwin J. Niklitschek

et al.

Estuarine Coastal and Shelf Science, Journal Year: 2023, Volume and Issue: 285, P. 108302 - 108302

Published: March 16, 2023

Language: Английский

Citations

3
New insights into the Weddell Sea ecosystem applying a quantitative network approach DOI Creative Commons
Tomás I. Marina, Leonardo Saravia, Susanne Kortsch

et al.

Published: Jan. 20, 2023

Abstract. Network approaches can shed light on the structure and stability of complex marine communities. In recent years, such have been successfully applied to study polar ecosystems, improving our knowledge how they might respond ongoing environmental changes. The Weddell Sea is one most studied ecosystems outside Antarctic Peninsula in Southern Ocean. Yet, few studies consider known complexity food web, which its current form comprises 490 species 16041 predator-prey interactions. Here we analysed focusing trophic interactions that underpin ecosystem stability. We estimated strength for each interaction characterised position web using unweighted weighted properties, species’ roles with respect web. found distribution (IS) at level asymmetric, many weak strong ones. detected a positive relationship between mean IS two properties (i.e., total number interactions). also only possess key positions terms These are by high IS, mid level, relatively interactions, low similarity. this study, integrated information, enabling more complete assessment function Our results provide new insights, important development effective policies management strategies, particularly given initiative implement Marine Protected Area (MPA) Sea.

Language: Английский

Citations

2
Mesoscale and climate environmental variability drive krill community changes in the Humboldt Current System DOI
Macarena Díaz-Astudillo, Ramiro Riquelme‐Bugueño, Gonzalo S. Saldías

et al.

Journal of Marine Systems, Journal Year: 2024, Volume and Issue: 245, P. 103998 - 103998

Published: June 15, 2024

Language: Английский

Citations

0
Growth and ecophysiology of two Antarctic benthic predators; Isotealia antarctica and Urticinopsis antarctica. DOI Creative Commons
Nadia Frontier, Joseph Marlow,

Adriana Giles

et al.

Journal of Experimental Marine Biology and Ecology, Journal Year: 2024, Volume and Issue: 579, P. 152045 - 152045

Published: July 24, 2024

There is a dearth of basic life history and physiological data from Southern Ocean species, particularly benthic vagile predators. This an important gap because species inhabiting the live in more temperature stable but seasonally varying environment than temperate tropical counterparts. For many living below 0 °C for significant proportion year, bodily functions are slowed to disproportionately lower rates would be predicted by alone. Certain processes often aligned with short summer season productivity. However, predators may behave differently they decoupled phytoplankton bloom some have been shown exhibit less seasonal change. To further our understanding Antarctic predator growth ecophysiology, field were measured two soft-bodied anemone predators, Isotealia antarctica Urticinopsis antarctica, using situ sampling anemones on uniquely marked tiles. Ex measurements oxygen consumption seven-day faecal output obtained recently collected specimens aquaria compared between winter. Winter rare, we tested hypothesis that generalist feeders or continue feed during Growth differed years. I. U. both exhibited overall positive across 15 month period 2020 2021; increasing 199.80% (± SE 25.8) mass 16.85% 8.9) increase antarctica. was no difference antarctica's 25 months deployment. After months, showed average 7.96% 8.05) buoyant weight. egestion did not differ seasonally, which, demonstrates fed at similar winter summer. In contrast members Antarctica benthos, actively all year round, whereas several other reported enter state torpor

Language: Английский

Citations

0
Zooplankton abundance and distribution along the Mawson coast, East Antarctica DOI Creative Commons
Christine K. Weldrick, M Brasier, Alicia L. Burns

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: Nov. 22, 2024

During the summer of 2021, we conducted a comprehensive study on zooplankton communities along East Antarctica (55°E to 80°E) as part Trends in Euphausiids off Mawson, Predators, and Oceanography (TEMPO) survey program. Hierarchical agglomerative clustering identified three distinct clusters based environmental factors. Seven potential indicator taxa associated with specific include copepods, pteropods, amphipods, euphausiids. Mainly consisting small chaetognaths foraminifera, Cluster 1 ( n = 34) was characterized by highest abundance (74,386 ind./1000 m 3 ), spanning wide latitudinal longitudinal gradients, deeper waters (mean depth 3,475 ± 739 m), higher chlorophyll- concentrations 49.13 mg −2 24.38 ). 2 4) featured lowest (1,059 ) fewest sampling stations narrowest range. Copepods, euphausiids, foraminifera were among most abundant this group. 10), located near ice edge, displayed temperature range (−1.46°C 1.18°C) moderate (22,629 ostracods. IndVal analysis seven species indicators conditions Generalized Additive Models (GAMs) used model their abundance, well total abundance. Across all models, significant drivers included , temperature, number days since sea melt mixed layer depth. The for explained 70.9% deviance, concentration emerging strongest predictors. These findings provide crucial insights into ecological implications changing climate repercussions broader Southern Ocean ecosystem. This research enhances our understanding intricate relationship between shifts ecology.

Language: Английский

Citations

0