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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 management |
| Research Field: | Conservation and biodiversity |
| Objective Division: | Environmental Management |
| Objective Group: | Marine systems and management |
| Objective Field: | Marine biodiversity |
| UTAS Author: | Hinojosa Toledo, IA (Mr Ivan Hinojosa) |
| ID Code: | 88826 |
| Year Published: | 2011 |
| Web of Science® Times Cited: | 77 |
| Deposited By: | Sustainable Marine Research Collaboration |
| Deposited On: | 2014-02-18 |
| Last Modified: | 2014-05-22 |
| Downloads: | 0 |
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