Atlantic Ocean

Elsevier eBooks, Год журнала: 2025, Номер unknown, С. 265 - 286

Опубликована: Янв. 1, 2025

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Macrozoobenthic Communities in the Upwelling Area off Chile (36° S) with Special Consideration of the Oxygen Minimum Zone

Diversity, Год журнала: 2025, Номер 17(4), С. 278 - 278

Опубликована: Апрель 16, 2025

The Humboldt Current System (HCS) off southwest America is known for its strong upwelling and the resulting high primary production associated oxygen minimum zones (OMZs). Macrozoobenthic species represent a group of organisms that are affected by low concentrations in OMZ. In January 2023, benthic diversity was investigated at 8 stations on transect Concepción, central Chile (in centre OMZ) water depth range from 56 to 912 m. measured values ranged 0 µmol/L OMZ 144.64 outside At each station, 3 van Veen grabs were taken, identified, counted weighed. mean abundance, biomass calculated station. This analysis provided an overview changes communities different concentrations. with levels differed greatly those higher levels. Species increased during transition (<2 µmol/L) (>100 µmol/L). contrast, abundance and, lesser extent, tended be composition various showed occurrence polychaetes. spionid polychaete Paraprionospio pinnata played important role as key within addition Paraprionospio, Ampelisca araucana, Magelona phyllisae, Nephtys ferruginea Cossura chilensis found zone (50–200 m depth). edge presumably below (300–912 m), where concentration rises again, dominance individual decreased, total number increased. addition, changed other families (Cirratulidae, Amphinomidae, Oweniidae Capitellidae) amplified. proportion polychaetes decreased almost 100% low-oxygen around 60% zone. Bivalvia Thyasiridae, Nuculidae Yoldiidae particular importance deeper share up 20% abundance. study better understand future structure function marine ecosystems hypoxic waters.

Язык: Английский

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Macrozoobenthic Diversity along an Oxygen Gradient in the Deep Trough of the Gulf of St. Lawrence (Canada)

Diversity, Год журнала: 2023, Номер 15(7), С. 854 - 854

Опубликована: Июль 14, 2023

In 2015, we studied the macrozoobenthic community composition along a dissolved oxygen gradient in deep trough of Gulf St. Lawrence (Canada). We sampled seabed at nine stations using box corers (three replicates per station), starting outer and ending Lower River Estuary. found four different communities dominated by polychaetes, crustaceans, molluscs, with emphasis shifting from mollusc to polychaete as saturation decreased. Contrary our expectations, furthest upstream estuary lowest levels had highest species diversity, also density biomass values. Key genera hypoxic zone included bivalves (Thyasira), cumaceans (Diastylis), amphipods (Harpinia), polychaetes such Ampharete, Ceratocephale, Galathowenia, Trochochaeta. attribute this stability environmental conditions absence stress, where constant supply oxygen, even low concentrations, seems be more important than absolute concentration.

Язык: Английский

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Diversity, distribution and knowledge gaps of Polychaeta on the continental shelf of southern Namibia

African Zoology, Год журнала: 2024, Номер unknown, С. 1 - 16

Опубликована: Июль 10, 2024

Язык: Английский

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