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Closed Access item Long-term changes in the abundance and deepening of the deep-sea shrimp Aristaeomorpha foliacea in the Balearic Basin: Relationships with hydrographic changes at the Levantine Intermediate Water
|Authors:||Cartes, Joan Enric|
Gil de Sola, Luis
|Keywords:||Deep Sea, Levantine Intermediate Water (LIW), Physical oceanography, Aristaeomorpha foliacea, Dissolved oxygen, Metabolic acclimatation, Species extinction, Loss of diversity|
|Citation:||Journal of Marine Systems 88(4) 516–525 (2011)|
|Abstract:||We compiled long-term data (from commercial landings and scientific surveys) on the density (D) and the
depth distribution of the deep-living shrimp Aristaeomorpha foliacea in the Balearic Basin (western
Mediterranean) from the 1950s to 2010. We analyzed these data in relation to changes in temperature (T)
and salinity (S) of the intermediate water column, where the species inhabits. A. foliacea showed the highest
densities in the 1950s–1960s in the northern sector of the Balearic Basin off the central coasts of Catalonia, ca.
0.6–20.7 ind/ha, and to the north of Mallorca, ca. 7.5–43 ind/ha. Later, densitiesN1 ind/ha were only found
close to Eivissa Channel at the south side of the Balearic Basin: 1.9–11.4 ind/ha in 1992, 2001 and 2005. In the
northern Balearic Basin, A. foliacea has almost disappeared since the 1970s. In the same period A. foliacea
showed significant deepening (r2=0.90) of its population Center of Gravity (CoG) from the 1950s–60s
(CoG=466 m) to 1995–2002 (CoG=538 m) and then stabilized during 2003–2010 (CoG=535m).
Temperature of the Levantine Intermediate Water (LIW) core (at ca. 400 m depth) off the central coasts of
Catalonia progressively increased from 12.95 °C in 1957 to 13.31 °C in 1977, reaching 13.44 °C and 13.41 °C in
1998 and 2007 respectively. Salinity showed a similar increase from 38.40 psu in 1957 to 38.43 psu in 1977,
then reaching 38.55 psu in 1998 and 38.56 psu in 2007. Estimated D of A. foliacea decreased significantly
(Spearman ρ) when the T and S at the LIW core increased (pb10−6), as did T and S at the optimum depth of A.
foliacea (pb0.001). Multiple Linear regression (MLR) models related the decrease of A. foliacea D with
increasing T at LIW (up to 55% of explained variance, depending upon the variables included in the MLR
model). The optimum depth of A. foliacea was always deeper than the LIW core, with the depth difference
between the CoG and the LIW core increasing from 80.6 m in 1957 to 138.1–153.7 m in the 1990s–2000s.
Thus, the optimum habitat of the species was never directly linked to LIW conditions (maxima of T and S) as
previously thought. We discuss possible physiological and trophic effects that could explain the local
extinction of A. foliacea in the northern Balearic Basin due to changes of T and S in its habitat, associated with
reduced O2 concentration at the LIW core.|
|Description:||10 pages, 7 figures,4 tables|
|Publisher version (URL):||http://dx.doi.org/10.1016/j.jmarsys.2011.07.001|
|Appears in Collections:||(ICM) Artículos|
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