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Temporal and spatial distribution of floating objects in coastal waters of central-southern Chile and Patagonian fjords

Citation

Hinojosa Toledo, IA and Rivadeneira, MM and Thiel, M, Temporal and spatial distribution of floating objects in coastal waters of central-southern Chile and Patagonian fjords, Continental Shelf Research, 31, (3-4) pp. 172-186. ISSN 0278-4343 (2011) [Refereed Article]

Copyright Statement

Copyright 2010 Elsevier

DOI: doi:10.1016/j.csr.2010.04.013

Abstract

Floating objectsaresuggestedtobetheprincipalvectorforthetransportanddispersalofmarine invertebrateswithdirectdevelopmentaswellascatalystsforcarbonandnutrientrecyclingin accumulationareas.Thefirststepinidentifyingtheecologicalrelevanceoffloatingobjectsinaspecific area istoidentifytheirspatio-temporaldistribution.Weevaluatedthecomposition,abundance, distribution,andtemporalvariabilityoffloatingobjectsalongthecontinentalcoastofcentral–southern Chile (33–421S) andthePatagonianfjords(42–501S) usingshipsurveysconductedinaustralwinter (July/August)andspring(November)oftheyears2002–2005and2008.Potentialsourcesoffloating items wereidentifiedwiththeaidofpubliclyavailabledatabasesandscientificreports.Wefoundthree main typesoffloatingobjects,namelyfloatingmarinedebris(mainlyplasticobjectsandStyrofoam), wood (trunksandbranches),andfloatingkelps(Macrocystispyrifera and Durvillaea antarctica).Floating marinedebriswereabundantalongmostoftheexaminedtransects,withmarkedlylowerabundances towardthesouthernfjordareas.Floatingmarinedebrisabundancesgenerallycorrespondedtothe distributionofhumanactivities,andwerehighestintheInteriorSeaofChiloe´ , whereaquaculture activitiesareintense.Floatingwoodappearedsporadicallyinthestudyarea,oftenclosetothemain rivers. Inaccordancewithseasonalriverrun-off,woodwasmoreabundantalongthecontinentalcoast in winter(rainyseason)andinthePatagonianfjordsduringthespringsurveys(snowmelt).Densitiesof the twofloatingkelpspeciesweresimilaralongthecontinentalcoast,withoutaclearseasonalpattern. M. pyrifera densitiesincreasedtowardsthesouth,peakinginthePatagonianfjords,whereitwas dominantover D. antarctica. Densitiesof M. pyrifera in thePatagonianfjordswerehighestinspring. Correlationanalysesbetweentheabundancesoffloatingobjectsandthedistancetothenearestsources were generallynon-significant,suggestingthatpost-supplyprocessesaffectthedistributionofthe floating objectsinthestudyregion.Theidentificationofseveralmajorretentionzonessupportsthis idea.Accumulationareasoffloatingobjectsappeartobemorecommoninthefjordzones.Ingeneral, the resultsunderscoretheabundanceoffloatingobjectsthroughoutthestudyregionandthefactthat floating marinedebrissourcesaremostlylocal,whereasfloatingalgaemaybedispersedovergreater distances.Futurestudiesshouldfocusontheecologicalroleoffloatingobjectsinbiotadispersaland nutrientcycling.

Item Details

Item Type:Refereed Article
Keywords:Rafting, Floating kelp, Driftwood, Anthropogenic debris, Fjords, Dispersal
Research Division:Environmental Sciences
Research Group:Environmental Science and Management
Research Field:Conservation and Biodiversity
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Hinojosa Toledo, IA (Mr Ivan Hinojosa)
ID Code:88826
Year Published:2011
Web of Science® Times Cited:43
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2014-02-18
Last Modified:2014-05-22
Downloads:0

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