Mutschke Orellana, Erika E.

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Mutschke Orellana, Erika E.

Afiliación principal

Instituto de la Patagonia

erika.mutschke@umag.cl

ORCID

0000-0002-8934-3362

Jerarquía académica

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Línea de investigación

Energía y Ambiente

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Mostrando 1 - 4 de 4

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DOI 10.1016/j.ecss.2019.106536
Benthic trophic structure of a Patagonian fjord (47°S): The role of hydrographic conditions in the food supply in a glaciofluvial system
2020-2-5
Cari, Ilia
;
Andrade Diaz, Claudia Daniela Yanett
;
Quiroga, Eduardo
;
Mutschke Orellana, Erika E.
Food web studies have provided insight into the dynamics of benthic ecosystems and their stability, stimulating research into the importance of different organic matters (OM) inputs in the ecological and metabolic processes that affect community structure. Using stable isotope analysis (SIA) and Bayesian ellipses, this study examines the influence of terrestrial OM and hydrographic conditions on food web structure and niche width in a glacial system (Baker/Martinez fjord complex). Two ecological groups were identified; one located in the inner and middle fjord and the other one in the outer fjord. Both had isotopically less diverse feeding groups in comparison to non-glacier benthic communities, comprising four trophic levels. In addition, the study area exhibited high trophic redundancy (e.g., species with overlapping trophic niches) associated with chronic natural physical disturbances from glacial sedimentations, which have shaped this non-selective feeding benthic community. The trophic structure metrics suggest that the benthic food web is supported principally by primary production and terrestrial OM pathways, but macroalgal subsidies could be important to detritivores via floating kelp in the inner area of the fjord. The results of this study suggest that glaciofluvial benthic communities have higher trophic redundancy associated with environmental disturbance conducted by sediment load, shaping a benthic community with a lower alpha diversity and fewer trophic levels in comparison to no-glacier environments.
Scopus© Citations 17 2
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DOI 10.1016/j.jcz.2022.03.001
New record and first description including SEM and μCT of the rare priapulid Acanthopriapulus horridus (Priapulida, Scalidophora)
2022-5
Schmidt-Rhaesa, Andreas
;
Cañete Aguilera, Juan Ivan
;
Mutschke Orellana, Erika E.
We report a specimen of the rare priapulid Acanthopriapulus horridus from the Magellan Strait in Chile. This species, characterized by a conspicuous spine-covered caudal appendage, is distributed along the South American coast from Rio de Janeiro (Brazil) to the Magellan Strait, but only six specimens have been reported so far. This is the first documentation using scanning electron microscopy (SEM) and mu CT. Our investigation confirms and extends most reported results from previous publications. We show that the scalids on the introvert, although more loosely arranged than in other priapulids, occur in repeated series of decreasing size. Scalids and the different papillae on the trunk are sensory structures with apical tube-like openings. The spines on the caudal appendage have an apical opening, but pores instead of tube-like receptor openings. Pharyngeal teeth appear to be of two types in different regions of the pharynx. The caudal appendage is a strongly muscular organ, but its function remains unclear. (C) 2022 Published by Elsevier GmbH.
Scopus© Citations 11 2
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DOI 10.1007/s00367-017-0530-6
The Seno Otway pockmark field and its relationship to thermogenic gas occurrence at the western margin of the Magallanes Basin (Chile)
2018-6
Kilian, R.
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Breuer, S.
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Behrmann, J. H.
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Baeza, O.
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Diaz-Michelena, M.
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Mutschke Orellana, Erika E.
;
Arz, H.
;
Lamy, F.
Pockmarks are variably sized crater-like structures that occur in young continental margin sediments. They are formed by gas eruptions and/or long-term release of fluid or gas. So far no pockmarks were known from the Pacific coast of South America between 51 degrees S and 55 degrees S. This article documents an extensive and previously unknown pockmark field in the Seno Otway (Otway Sound, 52 degrees S) with multibeam bathymetry and parametric echosounding as well as sediment drill cores. Up to 31 pockmarks per square kilometer occur in water depths of 50 to > 100 m in late glacial and Holocene sediments. They are up to 150 m wide and 10 m deep. Below and near the pockmarks, echosounder profiles image acoustic blanking as well as gas chimneys often crosscutting the 20 to >30 m thick glacial sediments above the acoustic basement, in particular along fault zones. Upward-migrating gas is trapped within the sediment strata, forming dome-like features. Two 5 m long piston cores from inside and outside a typical pockmark give no evidence for gas storage within the uppermost sediments. The inside core recovered poorly sorted glacial sediment, indicating reworking and re-deposition after several explosive events. The outside core documents an undisturbed stratigraphic sequence since similar to 15 ka. Many buried paleo-pockmarks occur directly below a prominent seismic reflector marking the mega-outflow event of the Seno Otway at 14.3 ka, lowering the proglacial lake level by about 80 m. This decompression would have led to frequent eruptions of gas trapped in reservoirs below the glacial sediments. However, the sediment fill of pockmarks formed after this event suggests recurrent events throughout the Holocene until today. Most pockmarks occur above folded hydrocarbon-bearing Upper Cretaceous and Paleogene rocks near the western margin of the Magallanes Basin, constraining them as likely source rocks for thermogenic gas.
Scopus© Citations 3 2
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DOI 10.3856/vol47-issue1-fulltext-21
Ascidia ceratodes (Huntsman, 1912) (Tunicata: Ascidiidae) off the northern Chilean coast: new record
2019-3
Cañete Aguilera, Juan Ivan
;
López, José L.
;
Mutschke Orellana, Erika E.
ABSTRACT The ascidian fauna of northern Chile (18° to 25°S) is poorly known. A member of the family Ascidiidae, Ascidia ceratodes (Huntsman, 1912), is reported in this study. We collected samples of A. ceratodes under intertidal boulders off the northern Chilean coast between Arica (18°S) and Iquique (20°S) (17 to 20°C; intertidal pool; <0.5 m depth; August, 2016). This finding verified a questionable record established by Van Name (1945) from Tocopilla (22°S), northern Chile. This record extends the confirmed geographical distribution of A. ceratodes along of the eastern Pacific coast from British Columbia, Canada, to northern Chile.
Scopus© Citations 3 2

Mutschke Orellana, Erika E.

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