INVESTIGADORES
IRIBARNE Oscar Osvaldo
artículos
Título:
Crab bioturbation and herbivory may account for variability in carbon sequestration and stocks in South West Atlantic salt marshes
Autor/es:
MARTINETTO P; D. I. MONTEMAYOR; ALBERTI, J; COSTA, C; O. IRIBARNE,
Revista:
Frontiers in Marine Science
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2016 vol. 3 p. 122 - 126
ISSN:
2296-7745
Resumen:
Coastalvegetationplaysanimportantroleforclimatechangemitigation.Comparedwithterrestrialecosystems,coastalvegetationshowshigherratesofatmosphericCO2uptakeandamoreefficientretentionofcarbon(C)insediments.SaltmarshespresentthehighestvaluesasCbinders,althoughaglobalestimationofthesevaluesisstillpendingduetoregionalgapsintherecordspredominantlyfromthesouthernhemisphere.Therearenoclearpatternsordominantprocesseswithenoughevidencetoaccountfortheobservedvariability,suggestingthatcontextdependentprocessesarelikelygreatestinfluencersonCstorage.SaltmarshesintheSouthWestAtlantic(SWA)coastaredenselypopulatedbytheintertidalburrowingandherbivorecrabNeohelice(=Chasmagnathus)granulata.ManyecologicalprocessesrelatedtoCtransformationoccurringinthesesaltmarshesareinfluencedbycrabactivities,eitherthroughbioturbationorviaherbivory.WehypothesizethatN.granulatacouldhaveasignificantroleinthecapacityofSWAsaltmarshestobindC.Reductionofplantbiomass,increasedaerobicdecompositioninthesedimentandfacilitationoferosionaresomeofthemultipleeffectsexertedbyN.granulatathatcandirectlyandindirectlymodifythecapacityofsaltmarshestobindC.Here,wecompiledinformationavailableregardingCsequestrationandaccumulationinSWAcoastalsaltmarshesandproposeahypotheticalmodelincludingthemechanismsmediatedbyN.granulatathatinterferethetransformationpathsofCinsaltmarshes.Thedatasuggestthatmechanismsthataretop-downregulated,negativelyaffectCaccumulationintheformofabovegroundbiomassespeciallyinsaltmarshesdominatedbySpartinaalterniflora.While,mechanismsmediatedbybioturbationcannegatively(increasingoxygenationandthusfacilitatingaerobicdegradation)affectaswellaspositively(increasingretentionofmacrodetritus)affecttheaccumulationofC,thelatterbeingofgreatermagnitudeinSpartinadensiflorasaltmarshes.
