Species diversity, spatial distribution, and assemblages of zooplankton within the Strait of Magellan in austral summer

Zagami, Giacomo; Antezana, Tarsicio; Ferrari, I.; Granata, Antonia; Sitran, Raffaella; Minutoli, Roberta; Guglielmo, Letterio

doi:10.1007/s00300-011-0962-9

Cited by 13 publications

(6 citation statements)

References 20 publications

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“…This latter species is widely distributed in shelf areas off Argentina and Chile, southern South America (Mazzocchi et al 1995). During summer, D. forcipatus is the most abundant copepod in the Beagle Channel (this study), the Straits of Magellan (Zagami et al 2011), and some shelf areas of the south-western Atlantic Ocean (Sabatini 2008). The other two dominant species (O. similis and C. citer) have been previously described as the dominant copepods in some coastal areas of the Beagle Channel (Ferna ´ndez-Severini & Hoffmeyer 2005;Biancalana et al 2007).…”

Section: Taxamentioning

confidence: 71%

Seasonal variability of metazooplankton in coastal sub-Antarctic waters (Beagle Channel)

Aguirre

Capitanio

Lovrich

et al. 2012

Marine Biology Research

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This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden.The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae, and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand, or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.

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Section: Taxamentioning

confidence: 71%

Seasonal variability of metazooplankton in coastal sub-Antarctic waters (Beagle Channel)

Aguirre

Capitanio

Lovrich

et al. 2012

Marine Biology Research

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“…Thus, it is an important member of the food web, influencing the overall ecosystem. In addition, other species, such as Thysanoessa gregaria, Nematoscelis megalops, Euphausia lucens, Stylocheiron longicornis and S. maximum have been occasionally found in the Magellan Strait (Zagami et al 2011). The wide range of abundance of E. vallentini we found may be caused by diurnal and noc turnal sampling of this species, which performs conspicuous vertical (circadian) migration.…”

Section: Euphausiid Ecologymentioning

confidence: 76%

Carbon flow through the pelagic food web in southern Chilean Patagonia: relevance of Euphausia vallentini as a key species

González¹,

Graeve²,

Kattner³

et al. 2016

Mar. Ecol. Prog. Ser.

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The southernmost Patagonian region constitutes a major glaciered area with a high freshwater input loaded with particulate and dissolved matter. We assessed the relevance of the terrestrial (allochthonous) and marine (autochthonous) matter that permeates into the fjord and channel system and their possible impact on the euphausiid-based food web. A research cruise (CIMAR 16) was conducted from 18 October to 13 November 2010 (austral spring) in the area between Magellan Strait and Drake Passage to study the physical-chemical and biological characteristics of the pelagic food web, as well as the main biological processes linked with the food web. The dominance of phytoplankton within the autochthonous fractions of particulate organic carbon (POC) and the high abundance and bacterivory rate shown by the heterotrophic nanoflagellates suggest an interplay between microbial and classical food webs. Euphausia vallentini showed a moderate grazing impact (3% of the gross primary production) and a daily ration of 18.6%, and the fecal pellet production rate corresponded to 24.5% of the ingestion rate. This species removed heterotrophic prey (67.5%) preferentially over diatoms (32.5%), and the ingested diet was mainly dinoflagellates, tintinnids, crustacean nauplii and centric diatoms. Overall, euphausiids fed preferentially on marine matter, which showed a tight link with the pelagic food web. Congeneric species of the genus Euphausia shared the condition of 'key species' as they constitute a major carbon and energy flow from lower to higher trophic levels and an important part of the POC flux through their active vertical migration and passive fecal-carbon export. KEY WORDS: Chilean Patagonia · Euphausia vallentini · Pelagic carbon flux · Euphausiid dietResale or republication not permitted without written consent of the publisher

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“…Locations with low salinity (e.g., Poca Esperanza [ 12 , 13 ], Península Benson [ 18 , 19 ], Isla Hunter [ 16 , 17 ], and Baverstock [ 4 , 5 ]) clustered towards the high end of RDA Axis 1 and were correlated with the Chilean mussel Mytilus chilensis and the orange trumpet sponge Amphimedon maresi . Locations in the Strait of Magellan (e.g., Carlos III [ 1 , 22 ], Isla Rupert [ 23 ], and Isla Duntze [ 24 , 25 ]) clustered towards the lower end of RDA Axis 1 and were correlated with a diversity of mobile taxa, which included the sea stars Anasterias antarctica , Cosmasterias lurida , the painted shrimp Campylonotus vagans , painted keyhole limpets Fissurella picta + oriens , and an assemblage of chitons of the genus Tonicia .…”

Section: Resultsmentioning

confidence: 99%

“…The Strait of Magellan is a 565 km interoceanic route and a major hydrological feature that separates the South American continent from Tierra del Fuego. It is the confluence of water masses from the Pacific and Atlantic oceans, with influence from the Southern Ocean [ 17 , 18 ]. The waters of the Strait of Magellan are fresher and cooler than the open shelf waters, owing to the effects of melting water from numerous glaciers [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Marine communities of the newly created Kawésqar National Reserve, Chile: From glaciers to the Pacific Ocean

et al. 2021

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The newly created Kawésqar National Park (KNP) and National Reserve (KNR) in southern Chile consists of diverse terrestrial and marine habitats, which includes the southern terminus of the Andes, the Southern Patagonia Ice Fields, sub-Antarctic rainforests, glaciers, fjords, lakes, wetlands, valleys, channels, and islands. The marine environment is influenced by wide ranging hydrological factors such as glacier melt, large terrigenous inputs, high precipitation, strong currents, and open ocean water masses. Owing to the remoteness, rugged terrain, and harsh environmental conditions, little is known about this vast region, particularly the marine realm. To this end, we conducted an integrated ecological assessment using SCUBA and remote cameras down to 600 m to examine this unique and largely unexplored ecosystem. Kelp forests (primarily Macrocystis pyrifera) dominate the nearshore ecosystem and provide habitat for myriad benthic organisms. In the fjords, salinity was low and both turbidity and nutrients from terrigenous sources were high, with benthic communities dominated by active suspension feeders (e.g., Bivalvia, Ascidiacea, and Bryozoa). Areas closer to the Pacific Ocean showed more oceanic conditions with higher salinity and lower turbidity, with benthic communities experiencing more open benthic physical space in which predators (e.g., Malacostraca and Asteroidea) and herbivorous browsers (e.g., Echinoidea and Gastropoda) were more conspicuous components of the community compared to the inner fjords. Hagfish (Myxine sp.) was the most abundant and frequently occurring fish taxa observed on deep-sea cameras (80% of deployments), along with several taxa of sharks (e.g., Squaliformes, Etmopteridae, Somniosidae, Scyliorhinidae), which collectively were also observed on 80% of deep-sea camera deployments. The kelp forests, deep fjords, and other nearshore habitats of the KNR represent a unique ecosystem with minimal human impacts at present. The KNR is part of the ancestral territory of the indigenous Kawésqar people and their traditional knowledge, including the importance of the land-sea connection in structuring the marine communities of this region, is strongly supported by our scientific findings.

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Species diversity, spatial distribution, and assemblages of zooplankton within the Strait of Magellan in austral summer

Cited by 13 publications

References 20 publications

Seasonal variability of metazooplankton in coastal sub-Antarctic waters (Beagle Channel)

Seasonal variability of metazooplankton in coastal sub-Antarctic waters (Beagle Channel)

Carbon flow through the pelagic food web in southern Chilean Patagonia: relevance of Euphausia vallentini as a key species

Marine communities of the newly created Kawésqar National Reserve, Chile: From glaciers to the Pacific Ocean

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