Hydrodynamic effects on the origin and quality of organic matter for bivalves: an integrated isotopic, biochemical and transplant study

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Abstract

Different hydrodynamic conditions can affect both the origin and the quality of organicmatter available to bivalve molluscs. I chose 2 environments with very different hydrodynamics(a Mediterranean lagoon open to flow and a closed pond), but similar with regard to temperature, salinity, depth, wind exposure and algae coverage, to investigate this. The lagoon was characterised by active flow and bivalve molluscs, whereas the pond was closed off from the lagoon’s main flow but characterised by mussel beds of the highest density ever observed in the western Mediterranean.Biochemical features, 13C and 15N contents of particulate and sedimentary organic matter, and isotopic signatures of dominant organisms, were used as descriptors of the trophodynamics in both systems. In the lagoon, intense lateral drifting forces moved organic matter far from production sites, thereby depleting the water column of resuspended sedimentary organic matter. In the pond, winddriven conditions enhanced the coupling between the water column and the sediments, enriching the pond with resuspended sedimentary products. Integrating results, it was deduced that mussels in thepond could exploit, over time, organic matter produced in loco, continually rearranged in loco by means of wind-driven resuspension and consumed in loco with an efficiency able to sustain a massive secondary production. In contrast, under lagoon conditions, the benthic and pelagic habitats were uncoupled, so that each had its own independent status with its own dynamics and production. This reduced the suitability of this habitat for high levels of secondary production.
Lingua originaleEnglish
pagine (da-a)65-73
Numero di pagine9
RivistaMARINE ECOLOGY PROGRESS SERIES
Volume328
Stato di pubblicazionePublished - 2006

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hydrodynamics
bivalve
Bivalvia
lagoon
organic matter
pond
secondary productivity
algae
secondary production
mussels
mollusc
water column
habitats
habitat
particulates
resuspension
water
salinity
sediments
alga

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology

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title = "Hydrodynamic effects on the origin and quality of organic matter for bivalves: an integrated isotopic, biochemical and transplant study",
abstract = "Different hydrodynamic conditions can affect both the origin and the quality of organicmatter available to bivalve molluscs. I chose 2 environments with very different hydrodynamics(a Mediterranean lagoon open to flow and a closed pond), but similar with regard to temperature, salinity, depth, wind exposure and algae coverage, to investigate this. The lagoon was characterised by active flow and bivalve molluscs, whereas the pond was closed off from the lagoon’s main flow but characterised by mussel beds of the highest density ever observed in the western Mediterranean.Biochemical features, 13C and 15N contents of particulate and sedimentary organic matter, and isotopic signatures of dominant organisms, were used as descriptors of the trophodynamics in both systems. In the lagoon, intense lateral drifting forces moved organic matter far from production sites, thereby depleting the water column of resuspended sedimentary organic matter. In the pond, winddriven conditions enhanced the coupling between the water column and the sediments, enriching the pond with resuspended sedimentary products. Integrating results, it was deduced that mussels in thepond could exploit, over time, organic matter produced in loco, continually rearranged in loco by means of wind-driven resuspension and consumed in loco with an efficiency able to sustain a massive secondary production. In contrast, under lagoon conditions, the benthic and pelagic habitats were uncoupled, so that each had its own independent status with its own dynamics and production. This reduced the suitability of this habitat for high levels of secondary production.",
keywords = "Food availability, Mediterranean, Mollusc, POM, Physical factors, SOM, δ13C, δ15N",
author = "Gianluca Sara'",
year = "2006",
language = "English",
volume = "328",
pages = "65--73",
journal = "Marine Ecology - Progress Series",
issn = "0171-8630",
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TY - JOUR

T1 - Hydrodynamic effects on the origin and quality of organic matter for bivalves: an integrated isotopic, biochemical and transplant study

AU - Sara', Gianluca

PY - 2006

Y1 - 2006

N2 - Different hydrodynamic conditions can affect both the origin and the quality of organicmatter available to bivalve molluscs. I chose 2 environments with very different hydrodynamics(a Mediterranean lagoon open to flow and a closed pond), but similar with regard to temperature, salinity, depth, wind exposure and algae coverage, to investigate this. The lagoon was characterised by active flow and bivalve molluscs, whereas the pond was closed off from the lagoon’s main flow but characterised by mussel beds of the highest density ever observed in the western Mediterranean.Biochemical features, 13C and 15N contents of particulate and sedimentary organic matter, and isotopic signatures of dominant organisms, were used as descriptors of the trophodynamics in both systems. In the lagoon, intense lateral drifting forces moved organic matter far from production sites, thereby depleting the water column of resuspended sedimentary organic matter. In the pond, winddriven conditions enhanced the coupling between the water column and the sediments, enriching the pond with resuspended sedimentary products. Integrating results, it was deduced that mussels in thepond could exploit, over time, organic matter produced in loco, continually rearranged in loco by means of wind-driven resuspension and consumed in loco with an efficiency able to sustain a massive secondary production. In contrast, under lagoon conditions, the benthic and pelagic habitats were uncoupled, so that each had its own independent status with its own dynamics and production. This reduced the suitability of this habitat for high levels of secondary production.

AB - Different hydrodynamic conditions can affect both the origin and the quality of organicmatter available to bivalve molluscs. I chose 2 environments with very different hydrodynamics(a Mediterranean lagoon open to flow and a closed pond), but similar with regard to temperature, salinity, depth, wind exposure and algae coverage, to investigate this. The lagoon was characterised by active flow and bivalve molluscs, whereas the pond was closed off from the lagoon’s main flow but characterised by mussel beds of the highest density ever observed in the western Mediterranean.Biochemical features, 13C and 15N contents of particulate and sedimentary organic matter, and isotopic signatures of dominant organisms, were used as descriptors of the trophodynamics in both systems. In the lagoon, intense lateral drifting forces moved organic matter far from production sites, thereby depleting the water column of resuspended sedimentary organic matter. In the pond, winddriven conditions enhanced the coupling between the water column and the sediments, enriching the pond with resuspended sedimentary products. Integrating results, it was deduced that mussels in thepond could exploit, over time, organic matter produced in loco, continually rearranged in loco by means of wind-driven resuspension and consumed in loco with an efficiency able to sustain a massive secondary production. In contrast, under lagoon conditions, the benthic and pelagic habitats were uncoupled, so that each had its own independent status with its own dynamics and production. This reduced the suitability of this habitat for high levels of secondary production.

KW - Food availability

KW - Mediterranean

KW - Mollusc

KW - POM

KW - Physical factors

KW - SOM

KW - δ13C

KW - δ15N

UR - http://hdl.handle.net/10447/24909

M3 - Article

VL - 328

SP - 65

EP - 73

JO - Marine Ecology - Progress Series

JF - Marine Ecology - Progress Series

SN - 0171-8630

ER -