2024-03-28T23:25:12Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1396842019-03-06T13:55:35Zcom_10261_88com_10261_8com_10261_123col_10261_341col_10261_376
DIGITAL.CSIC
author
Román, Sara
author
Vanreusel, Ann
author
Romano, Chiara
author
Ingels, Jeroen
author
Puig, Pere
author
Company, Joan B.
author
Martin, Daniel
2016-11-02T07:49:54Z
2016-11-02T07:49:54Z
2016
Deep Sea Research Part I 117 : 70-83 (2016)
0967-0637
http://hdl.handle.net/10261/139684
10.1016/j.dsr.2016.10.004
We investigated the natural and anthropogenic drivers controlling the spatiotemporal distribution of the
meiofauna in the submarine Blanes Canyon, and its adjacent western slope (NW Mediterranean margin of the
Iberian Peninsula). We analyzed the relationships between the main sedimentary environmental variables (i.e.
grain size, Chl-a, Chl-a: phaeopigments, CPE, organic carbon and total nitrogen) and the density and structure
of the meiofaunal assemblages along a bathymetric gradient (from 500 to 2000 m depth) in spring and autumn
of 2012 and 2013.
Twenty-one and 16 major taxa were identified for respectively the canyon and slope, where the assemblages
were always dominated by nematodes. The gradual decreasing meiofaunal densities with increasing depth at the
slope showed little variability among stations and corresponded with a uniform pattern of food availability. The
canyon was environmentally much more variable and sediments contained greater amounts of food resources
(Chl-a and CPE) throughout, leading not only to increased meiofaunal densities compared to the slope, but also
different assemblages in terms of composition and structure. This variability in the canyon is only partly
explained by seasonal food inputs. The high densities found at 900 m and 1200 m depth coincided with
significant increases in food availability compared to shallower and deeper stations in the canyon. Our results
suggest that the disruption in expected bathymetric decrease in densities at 900–1200 m water depth coincided
with noticeable changes in the environmental variables typical for disturbance and deposition events (e.g.,
higher sand content and CPE), evoking the hypothesis of an anthropogenic effect at these depths in the canyon.
The increased downward particle fluxes at 900–1200 m depth caused by bottom trawling along canyon flanks,
as reported in previous studies, support our hypothesis and allude to a substantial anthropogenic factor
influencing benthic assemblages at these depths. The possible relationships of the observed patterns and some
major natural environmental (e.g., surface productivity or dense shelf water cascading) and anthropogenic (e.g.
the lateral advection and downward transport of food-enriched sediments resuspended by the daily canyonflank
trawling activities) drivers are discussed.
eng
openAccess
Submarine canyon
Northwestern Mediterranean
Meiobenthos
Deep-sea
Response to food sources
Anthropogenic activities
Trawling
High spatiotemporal variability in meiofaunal assemblages in Blanes Canyon (NW Mediterranean) subject to anthropogenic and natural disturbances
artículo
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URL
https://digital.csic.es/bitstream/10261/139684/3/Roman%20et%20al%202016_High%20spatiotemporal%20variability%20in%20meiofaunal%20assemblages%20in%20Blanes%20Canyon_NW%20Mediterranean%20subject%20to%20anthropogenic%20and%20natural%20distu.pdf
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d29708e6c3046b82c01ae524c4401e0f
719168
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Roman et al 2016_High spatiotemporal variability in meiofaunal assemblages in Blanes Canyon_NW Mediterranean subject to anthropogenic and natural distu.pdf