Factors influencing the abundance of deep pelagic bioluminescent zooplankton in the Mediterranean Sea

Jessica Craig, Alan J Jamieson, Rory Hutson, Alain F Zuur, Imants G Priede

Research output: Contribution to journalArticle

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Abstract

Measurements of the density of deep pelagic bioluminescent zooplankton (BL) were made with the Intensified Silicon Intensifier Target (ISIT) profiler in the Ligurian, Tyrrhenian, Adriatic, Ionian Seas and the Strait of Sicily from 300 m to near seafloor. Mean BL densities ranged from 2.61 m-3 at 500–1000 m depth in the Adriatic Sea to 0.01 m-3 at 4000–5000 m depth in the E Ionian Sea. We investigated drivers of spatial variation of deep pelagic BL density. Linear regression was applied between surface chlorophyll a (Chl a) concentration and underlying BL density. Chl a values were determined from satellite derived 100 km radius composites (six 10-day means per ISIT deployment, over preceding 60 days). At 500–1000 m depth we found a significant positive relationship between mean BL density and mean Chl a in the period prior to 0–10 days (at 1% level) and prior to 10–40 days (at 5% level). Beyond 40 days no relationship between BL density and Chl a was found at this depth. At depths 1000–1500 m BL density values were low and no significant relationship with Chl a was detected. Generalised additive modelling (GAM) was used to assess the influence of benthic hotspots (seamount; cold water coral mound; mud volcano) on overlying BL density. A reduction in BL density was found downstream of the Palinuro seamount from 300 to 600 m. No effect on BL density in the overlying water column was detected from the presence of cold water corals. Higher BL densities were detected over the W Madonna dello Ionio mud volcano than at other sites sampled in the NW Ionian Sea. We find surface Chl a to be a good predictor of BL density in the mesopelagic zone; below this depth we hypothesise that processes affecting the efficiency of particle export to deep water may exert greater influence on BL density.
Original languageEnglish
Pages (from-to)1474-1484
Number of pages11
JournalDeep Sea Research Part I: Oceanographic Research Papers
Volume57
Issue number11
Early online date20 Aug 2010
DOIs
Publication statusPublished - Nov 2010

Fingerprint

Mediterranean Sea
zooplankton
chlorophyll a
chlorophyll
mud volcano
volcanoes
Adriatic Sea
silicon
seamount
cold water
corals
coral
water
mesopelagic zone
Sicily
profiler
spatial variation
strait
hot spot
seafloor

Keywords

  • bioluminescent zooplankton
  • deep sea
  • pelagic zooplankton
  • Mediterranean
  • chlorophyll a
  • seamount
  • cold water coral
  • mud volcano
  • GAM

Cite this

Factors influencing the abundance of deep pelagic bioluminescent zooplankton in the Mediterranean Sea. / Craig, Jessica; Jamieson, Alan J; Hutson, Rory; Zuur, Alain F; Priede, Imants G.

In: Deep Sea Research Part I: Oceanographic Research Papers, Vol. 57, No. 11, 11.2010, p. 1474-1484.

Research output: Contribution to journalArticle

Craig, Jessica ; Jamieson, Alan J ; Hutson, Rory ; Zuur, Alain F ; Priede, Imants G. / Factors influencing the abundance of deep pelagic bioluminescent zooplankton in the Mediterranean Sea. In: Deep Sea Research Part I: Oceanographic Research Papers. 2010 ; Vol. 57, No. 11. pp. 1474-1484.
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T1 - Factors influencing the abundance of deep pelagic bioluminescent zooplankton in the Mediterranean Sea

AU - Craig, Jessica

AU - Jamieson, Alan J

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AU - Priede, Imants G

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AB - Measurements of the density of deep pelagic bioluminescent zooplankton (BL) were made with the Intensified Silicon Intensifier Target (ISIT) profiler in the Ligurian, Tyrrhenian, Adriatic, Ionian Seas and the Strait of Sicily from 300 m to near seafloor. Mean BL densities ranged from 2.61 m-3 at 500–1000 m depth in the Adriatic Sea to 0.01 m-3 at 4000–5000 m depth in the E Ionian Sea. We investigated drivers of spatial variation of deep pelagic BL density. Linear regression was applied between surface chlorophyll a (Chl a) concentration and underlying BL density. Chl a values were determined from satellite derived 100 km radius composites (six 10-day means per ISIT deployment, over preceding 60 days). At 500–1000 m depth we found a significant positive relationship between mean BL density and mean Chl a in the period prior to 0–10 days (at 1% level) and prior to 10–40 days (at 5% level). Beyond 40 days no relationship between BL density and Chl a was found at this depth. At depths 1000–1500 m BL density values were low and no significant relationship with Chl a was detected. Generalised additive modelling (GAM) was used to assess the influence of benthic hotspots (seamount; cold water coral mound; mud volcano) on overlying BL density. A reduction in BL density was found downstream of the Palinuro seamount from 300 to 600 m. No effect on BL density in the overlying water column was detected from the presence of cold water corals. Higher BL densities were detected over the W Madonna dello Ionio mud volcano than at other sites sampled in the NW Ionian Sea. We find surface Chl a to be a good predictor of BL density in the mesopelagic zone; below this depth we hypothesise that processes affecting the efficiency of particle export to deep water may exert greater influence on BL density.

KW - bioluminescent zooplankton

KW - deep sea

KW - pelagic zooplankton

KW - Mediterranean

KW - chlorophyll a

KW - seamount

KW - cold water coral

KW - mud volcano

KW - GAM

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DO - 10.1016/j.dsr.2010.08.005

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EP - 1484

JO - Deep Sea Research Part I: Oceanographic Research Papers

JF - Deep Sea Research Part I: Oceanographic Research Papers

SN - 0967-0637

IS - 11

ER -