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dc.contributor.authorJames, Cassandra S.
dc.contributor.authorW. Eaton, John
dc.contributor.authorHardwick, Keith
dc.date.accessioned2017-05-03T14:31:11Z
dc.date.available2017-05-03T14:31:11Z
dc.date.issued2006
dc.identifier.issn03043770
dc.identifier.doi10.1016/j.aquabot.2006.01.002
dc.identifier.urihttp://hdl.handle.net/10072/21484
dc.description.abstractIn some eutrophic inland waters the invasive aquatic macrophyte Elodea canadensis has been displaced by the morphologically similar species Elodea nuttallii and subsequently E. nuttallii by Lagarosiphon major. We investigated whether differences in the responses of these species and their associated epiphytic floras to five nutrient loadings in the range 30-480 姠L-1 P and 0.21-3.36 mg L-1 N could explain their observed field displacements. The mean relative growth rate (RGR) of E. nuttallii (RGR 0.086 d-1) was significantly higher than that of either E. canadensis (RGR 0.066 d-1) or L. major (RGR 0.063 d-1). All three species exhibited a plastic morphological response to increasing nutrient loadings with mean root weights reduced at the highest nutrient loading compared with the lowest loading by 33, 75 and 56% for E. canandensis, E. nuttallii and L. major, respectively. Mean tissue nitrogen concentrations increased significantly with increasing nutrient loading, with concentrations in E. canadensis (1.83-2.10% dry wt.) significantly higher than either E. nuttallii (1.56-2.10% dry wt.) or L. major (1.50-1.90% dry wt.). Tissue phosphorus concentrations likewise increased with increasing nutrient loadings although this trend was not as pronounced. Epiphyte biomass per unit photosynthetic surface area (PSA) was significantly higher on E. canadensis than on either E. nuttallii or L. major, but did not increase significantly with increasing nutrient loadings. We suggest that differences in species responses to nutrient enrichment do not explain the species displacements observed in the field. E. nuttallii's higher RGR may, regardless of nutrient supply, enable this species to shade out neighbouring species and outpace the establishment of algae on its leaves.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeNetherlands
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom347
dc.relation.ispartofpageto353
dc.relation.ispartofjournalAquatic Botany
dc.relation.ispartofvolume84
dc.rights.retentionY
dc.subject.fieldofresearchEcology
dc.subject.fieldofresearchPlant biology
dc.subject.fieldofresearchEcological applications
dc.subject.fieldofresearchcode3103
dc.subject.fieldofresearchcode3108
dc.subject.fieldofresearchcode4102
dc.titleResponses of three invasive aquatic macrophytes to nutrient enrichment do not explain their observed field displacements
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.date.issued2015-02-16T01:33:33Z
gro.hasfulltextNo Full Text
gro.griffith.authorJames, Cassie


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