Coccolithophore and benthic foraminifera distribution patterns in the Gulf of Cadiz and western Iberian margin during Integrated Ocean drilling program (IODP) expedition 339

Barbara Balestra, Patrick Grunert, B. Ausin, David Hodell, Jose-Abel Flores, Carlos A. Alvarez-Zarikian, Francisco-Javier Hernández-Molina, Dorrik Stow, W. E. Piller, A. Paytan

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Abstract

For the first time during an Integrated Ocean Drilling Program (IODP) Expedition (Exp. 339, Mediterranean Outflow) water samples for living coccolithophore distributions and mudline samples for coccoliths, benthic foraminifera, and geochemical analyses in the underlying surface sediments were collected. In total, 14 water samples (from 5 to 20 m water depth) and 7 mudline samples were gathered at the drill sites. Coccolithophore distributions show spatial variations in species diversity. In particular, assemblages that characterize the Western Iberian Margin differ from those in the Gulf of Cadiz, indicative of oceanographic and environmental controls on the community in the upper ocean (0–20 m depth). Comparison of the living assemblages to those in surface sediments shows differences in the presence of some species, suggesting the influence of post deposition sedimentary processes. Other factors such as the season of sampling and the limited sampling depth may also have a role in the differences recorded. Benthic foraminiferal assemblages seem to be primarily determined by source, quantity and quality of available food. Sites in the Gulf of Cadiz are bathed by Mediterranean Outflow Water (MOW) and characterized by a considerable amount of advected food particles. Elevated epibenthic foraminifera exploit this niche, while arborescent epifaunal and infaunal taxa thrive on food particles falling out of MOW. The combined data suggest different flow speeds and settling of MOW suspension load in the Gulf of Cadiz. In contrast, assemblages from the Western Iberian Margin located farthest from or outside of MOW are determined by local export productivity and mirror trophic conditions in the surface waters. Both assemblages reveal variation in the composition at intermediate and deep water depths along the southern and western Iberian Margins with distance from the Strait of Gibraltar.
Original languageEnglish
Pages (from-to)50–67
Number of pages18
JournalJournal of Marine Systems
Volume170
Early online date8 Feb 2017
DOIs
StatePublished - Jun 2017

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Water
outflow
gulfs
margins
food
oceans
expeditions
water depth
drilling
sediments
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benthic foraminifera
Ocean Drilling Program
sediment
Drilling
Sediments
Sampling
Gibraltar
environmental control

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Balestra, Barbara; Grunert, Patrick; Ausin, B.; Hodell, David; Flores, Jose-Abel; Alvarez-Zarikian, Carlos A.; Hernández-Molina, Francisco-Javier; Stow, Dorrik; Piller, W. E.; Paytan, A. / Coccolithophore and benthic foraminifera distribution patterns in the Gulf of Cadiz and western Iberian margin during Integrated Ocean drilling program (IODP) expedition 339.

In: Journal of Marine Systems, Vol. 170, 06.2017, p. 50–67.

Research output: Contribution to journalArticle

@article{39c8fc48a70047debcf3a932587eb6ca,
title = "Coccolithophore and benthic foraminifera distribution patterns in the Gulf of Cadiz and western Iberian margin during Integrated Ocean drilling program (IODP) expedition 339",
abstract = "For the first time during an Integrated Ocean Drilling Program (IODP) Expedition (Exp. 339, Mediterranean Outflow) water samples for living coccolithophore distributions and mudline samples for coccoliths, benthic foraminifera, and geochemical analyses in the underlying surface sediments were collected. In total, 14 water samples (from 5 to 20 m water depth) and 7 mudline samples were gathered at the drill sites. Coccolithophore distributions show spatial variations in species diversity. In particular, assemblages that characterize the Western Iberian Margin differ from those in the Gulf of Cadiz, indicative of oceanographic and environmental controls on the community in the upper ocean (0–20 m depth). Comparison of the living assemblages to those in surface sediments shows differences in the presence of some species, suggesting the influence of post deposition sedimentary processes. Other factors such as the season of sampling and the limited sampling depth may also have a role in the differences recorded. Benthic foraminiferal assemblages seem to be primarily determined by source, quantity and quality of available food. Sites in the Gulf of Cadiz are bathed by Mediterranean Outflow Water (MOW) and characterized by a considerable amount of advected food particles. Elevated epibenthic foraminifera exploit this niche, while arborescent epifaunal and infaunal taxa thrive on food particles falling out of MOW. The combined data suggest different flow speeds and settling of MOW suspension load in the Gulf of Cadiz. In contrast, assemblages from the Western Iberian Margin located farthest from or outside of MOW are determined by local export productivity and mirror trophic conditions in the surface waters. Both assemblages reveal variation in the composition at intermediate and deep water depths along the southern and western Iberian Margins with distance from the Strait of Gibraltar.",
author = "Barbara Balestra and Patrick Grunert and B. Ausin and David Hodell and Jose-Abel Flores and Alvarez-Zarikian, {Carlos A.} and Francisco-Javier Hernández-Molina and Dorrik Stow and Piller, {W. E.} and A. Paytan",
year = "2017",
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Balestra, B, Grunert, P, Ausin, B, Hodell, D, Flores, J-A, Alvarez-Zarikian, CA, Hernández-Molina, F-J, Stow, D, Piller, WE & Paytan, A 2017, 'Coccolithophore and benthic foraminifera distribution patterns in the Gulf of Cadiz and western Iberian margin during Integrated Ocean drilling program (IODP) expedition 339' Journal of Marine Systems, vol 170, pp. 50–67. DOI: 10.1016/j.jmarsys.2017.01.005

Coccolithophore and benthic foraminifera distribution patterns in the Gulf of Cadiz and western Iberian margin during Integrated Ocean drilling program (IODP) expedition 339. / Balestra, Barbara; Grunert, Patrick; Ausin, B.; Hodell, David; Flores, Jose-Abel; Alvarez-Zarikian, Carlos A.; Hernández-Molina, Francisco-Javier; Stow, Dorrik; Piller, W. E.; Paytan, A.

In: Journal of Marine Systems, Vol. 170, 06.2017, p. 50–67.

Research output: Contribution to journalArticle

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T1 - Coccolithophore and benthic foraminifera distribution patterns in the Gulf of Cadiz and western Iberian margin during Integrated Ocean drilling program (IODP) expedition 339

AU - Balestra,Barbara

AU - Grunert,Patrick

AU - Ausin,B.

AU - Hodell,David

AU - Flores,Jose-Abel

AU - Alvarez-Zarikian,Carlos A.

AU - Hernández-Molina,Francisco-Javier

AU - Stow,Dorrik

AU - Piller,W. E.

AU - Paytan,A.

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N2 - For the first time during an Integrated Ocean Drilling Program (IODP) Expedition (Exp. 339, Mediterranean Outflow) water samples for living coccolithophore distributions and mudline samples for coccoliths, benthic foraminifera, and geochemical analyses in the underlying surface sediments were collected. In total, 14 water samples (from 5 to 20 m water depth) and 7 mudline samples were gathered at the drill sites. Coccolithophore distributions show spatial variations in species diversity. In particular, assemblages that characterize the Western Iberian Margin differ from those in the Gulf of Cadiz, indicative of oceanographic and environmental controls on the community in the upper ocean (0–20 m depth). Comparison of the living assemblages to those in surface sediments shows differences in the presence of some species, suggesting the influence of post deposition sedimentary processes. Other factors such as the season of sampling and the limited sampling depth may also have a role in the differences recorded. Benthic foraminiferal assemblages seem to be primarily determined by source, quantity and quality of available food. Sites in the Gulf of Cadiz are bathed by Mediterranean Outflow Water (MOW) and characterized by a considerable amount of advected food particles. Elevated epibenthic foraminifera exploit this niche, while arborescent epifaunal and infaunal taxa thrive on food particles falling out of MOW. The combined data suggest different flow speeds and settling of MOW suspension load in the Gulf of Cadiz. In contrast, assemblages from the Western Iberian Margin located farthest from or outside of MOW are determined by local export productivity and mirror trophic conditions in the surface waters. Both assemblages reveal variation in the composition at intermediate and deep water depths along the southern and western Iberian Margins with distance from the Strait of Gibraltar.

AB - For the first time during an Integrated Ocean Drilling Program (IODP) Expedition (Exp. 339, Mediterranean Outflow) water samples for living coccolithophore distributions and mudline samples for coccoliths, benthic foraminifera, and geochemical analyses in the underlying surface sediments were collected. In total, 14 water samples (from 5 to 20 m water depth) and 7 mudline samples were gathered at the drill sites. Coccolithophore distributions show spatial variations in species diversity. In particular, assemblages that characterize the Western Iberian Margin differ from those in the Gulf of Cadiz, indicative of oceanographic and environmental controls on the community in the upper ocean (0–20 m depth). Comparison of the living assemblages to those in surface sediments shows differences in the presence of some species, suggesting the influence of post deposition sedimentary processes. Other factors such as the season of sampling and the limited sampling depth may also have a role in the differences recorded. Benthic foraminiferal assemblages seem to be primarily determined by source, quantity and quality of available food. Sites in the Gulf of Cadiz are bathed by Mediterranean Outflow Water (MOW) and characterized by a considerable amount of advected food particles. Elevated epibenthic foraminifera exploit this niche, while arborescent epifaunal and infaunal taxa thrive on food particles falling out of MOW. The combined data suggest different flow speeds and settling of MOW suspension load in the Gulf of Cadiz. In contrast, assemblages from the Western Iberian Margin located farthest from or outside of MOW are determined by local export productivity and mirror trophic conditions in the surface waters. Both assemblages reveal variation in the composition at intermediate and deep water depths along the southern and western Iberian Margins with distance from the Strait of Gibraltar.

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