Network analyses on photographic surveys reveal that invertebrate predators do not structure epibenthos in the deep (~2000m) rocky Powell Basin, Weddell Sea, Antarctica DOI Creative Commons
Tasnuva Ming Khan, Huw J. Griffiths, Rowan J. Whittle

et al.

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

Published: July 2, 2024

Predator-prey interactions in marine ecosystems control population sizes, maintain species richness, and provide intermediate disturbance. Such ecosystem structuring may be rare Antarctic epibenthic communities, which are unique among worldwide for their dominance of soft bodied fauna (sponges, hard corals, echinoderms) a simultaneous paucity shell crushing predators (sharks, rays durophagous decapods). In the shallow benthos, instead durophagy, important such as starfish, pycnogonids (sea spiders), nemertean worms, nudibranchs employ grazing, scavenging, or sucking strategies. Far less is known about deep sea (>1000 m) benthic communities due to challenging nature polar data collection, so that photographic surveys one only means making situ observations these communities. We used seabed photographs (~2000m) slope Powell Basin, northwest Weddell Sea, taken by Ocean Floor Observation Bathymetry System on board RV Polarstern (PS118, April 2019) investigate community composition, Bayesian Network Inference (BNI) determine ecological network, namely associations, including potential invertebrate predator-prey relationships between taxa. Photographs show rocky substrates basin support 10-22 morphotaxa per photo, highly abundant (density 106 553 individuals/m 2 ). BNI results reveal network associations sessile mobile suspension filter feeding organisms physical environment. However, like other organisms, were not detected network. This lack inclusion within suggests that, despite presence normally predators, Basin do have same ecosystem-regulating impact they

Language: Английский

Food web structure and species’ role in the sub-Antarctic Marine Protected Area Yaganes DOI

Melina Scian,

Luciana Riccialdelli,

Tomás I. Marina

et al.

Polar Biology, Journal Year: 2025, Volume and Issue: 48(2)

Published: Feb. 20, 2025

Language: Английский

Citations

0
Ichthyoplankton temporal and spatial patterns in sub-Antarctic coastal and oceanic waters of the Southwestern Atlantic DOI
Daniel O. Bruno,

Luciana Riccialdelli,

Yamila A. Becker

et al.

Estuarine Coastal and Shelf Science, Journal Year: 2025, Volume and Issue: unknown, P. 109260 - 109260

Published: March 1, 2025

Language: Английский

Citations

0
Food web structure and species’ role in an oceanic Marine Protected Area in the subantarctic DOI Creative Commons

Melina Scian,

Luciana Riccialdelli,

Tomás I. Marina

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: June 4, 2024

Abstract The Marine Protected Area Yaganes (MPAY) was created in response to the great deterioration that has been suffering ecosystems due environmental crisis is affecting our planet, with aim protect key ocean habitats and species. Located at southern tip of South America, MPAY home a wide variety marine biodiversity habitats, which makes it ​​special interest for conservation subantarctic environments. For first time, we described potential trophic interactions within MPAY, emphasis pelagic realm. We applied both network-level species-level approach characterise structure complexity properties, aiming comprehend dynamics specific roles certain species food web. In terms complexity, web consists 127 658 predator-prey interactions, density 5.18 connectance 0.04. Regarding its structure, around 69% occupied intermediate levels. Keystone Species Index (KSI), highlighted importance some such as Patagonian toothfish (Dissostichus eleginoides), amphipod Themisto gaudichaudii, euphausiids myctophids, among others,

Language: Английский

Citations

1
Loop analysis quantifying important species in a marine food web DOI Creative Commons
Ferenc Jordán, Katalin Patonai, Greta Capelli

et al.

Environmental and Sustainability Indicators, Journal Year: 2024, Volume and Issue: 24, P. 100500 - 100500

Published: Oct. 10, 2024

Language: Английский

Citations

1
The response of trophic interaction networks to multiple stressors in a marine latitudinal gradient of the Southern Hemisphere DOI Creative Commons
Tomás I. Marina, Leonardo Saravia,

Iara Hernandez Rodriguez

et al.

Published: Feb. 24, 2024

Ecological networks offer valuable insights into community structure, key species identification, and ecosystem management for biodiversity conservation. Understanding how these react to environmental anthropogenic stressors, especially along geographical gradients, is of increasing interest. This review presents a pioneering analysis stressor responses in marine food webs from the southwest Atlantic Antarctic (45 - 78ºS), encompassing areas such as San Jorge Gulf, Beagle Channel, Burdwood Bank, Scotia Sea, Potter Cove, Weddell Sea Antarctica. Our objectives are to: 1) describe structure this axis using network approach; 2) identify predominant stressors affecting each ecosystem; 3) summarize observed web changes hypothesize on impacts. collaborative team, comprising regional experts global authorities high-latitude effects, ensures comprehensive credible literature review. We assessed effects primarily at level, with notable exceptions like fisheries Gulf. Hypotheses study area were formulated considering: a) stressors; b) impacted parameters; c) node-level properties; d) network-level properties. Global warming emerges most common across gradient, except Channel where alien introduction more influential, respectively. specific hypotheses may affect webs. findings highlight benefits approach understanding predicting Southern Hemisphere ecosystems. provides holistic ecological networks, enhances our ability interactions, offers conservation face various stressors.

Language: Английский

Citations

0
The response of trophic interaction networks to multiple stressors along a large-scale latitudinal range in the Southern Hemisphere DOI
Tomás I. Marina, Leonardo Saravia, Iara Diamela Rodríguez

et al.

Environmental Reviews, Journal Year: 2024, Volume and Issue: unknown

Published: June 27, 2024

Ecological networks offer valuable insights into community structure, key species identification, and ecosystem management. Understanding how these respond to global change stressors is of increasing interest, especially along geographical gradients. This review summarizes potential stressor responses in marine food webs from the Southwest Atlantic Antarctic (45–78°S), encompassing areas such as San Jorge Gulf, Beagle Channel, Burdwood Bank, Scotia Sea, Potter Cove, Weddell Sea Antarctica. The objectives are (1) describe structure this latitudinal axis using a network approach; (2) identify predominant change-related affecting each ecosystem; (3) summarize observed web changes hypothesize on impacts. effects were primarily reviewed at level. Alternative hypotheses for study area formulated considering (a) main stressors; (b) impacted parameters; (c) node-level properties; (d) network-level properties. Global warming emerges most common among studied across gradient, except Channel where alien introduction fisheries more influential. We series alternative may affect webs. emphasizes benefits approach understand predict Southern Hemisphere ecosystems. provides holistic understanding ecosystems, which enhances our ability their interactions, offering management conservation face stressors.

Language: Английский

Citations

0
Network analyses on photographic surveys reveal that invertebrate predators do not structure epibenthos in the deep (~2000m) rocky Powell Basin, Weddell Sea, Antarctica DOI Creative Commons
Tasnuva Ming Khan, Huw J. Griffiths, Rowan J. Whittle

et al.

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

Published: July 2, 2024

Predator-prey interactions in marine ecosystems control population sizes, maintain species richness, and provide intermediate disturbance. Such ecosystem structuring may be rare Antarctic epibenthic communities, which are unique among worldwide for their dominance of soft bodied fauna (sponges, hard corals, echinoderms) a simultaneous paucity shell crushing predators (sharks, rays durophagous decapods). In the shallow benthos, instead durophagy, important such as starfish, pycnogonids (sea spiders), nemertean worms, nudibranchs employ grazing, scavenging, or sucking strategies. Far less is known about deep sea (>1000 m) benthic communities due to challenging nature polar data collection, so that photographic surveys one only means making situ observations these communities. We used seabed photographs (~2000m) slope Powell Basin, northwest Weddell Sea, taken by Ocean Floor Observation Bathymetry System on board RV Polarstern (PS118, April 2019) investigate community composition, Bayesian Network Inference (BNI) determine ecological network, namely associations, including potential invertebrate predator-prey relationships between taxa. Photographs show rocky substrates basin support 10-22 morphotaxa per photo, highly abundant (density 106 553 individuals/m 2 ). BNI results reveal network associations sessile mobile suspension filter feeding organisms physical environment. However, like other organisms, were not detected network. This lack inclusion within suggests that, despite presence normally predators, Basin do have same ecosystem-regulating impact they

Language: Английский

Citations

0