Show simple item record  

dc.contributor.authorCollier, Kevin J.
dc.contributor.authorClapcott, Joanne E.
dc.contributor.authorHamer, Mark P.
dc.contributor.authorYoung, Roger G.
dc.date.accessioned2013-06-12T04:43:47Z
dc.date.available2013-06-12T04:43:47Z
dc.date.copyright2013-11
dc.date.issued2013
dc.identifier.citationCollier, K. J., Clapcott, J. E., Hamer, M. P. & Young, R. G. (2013). Extent estimates and land cover relationships for functional indicators in non-wadeable rivers. Ecological Indicators, 34, 53-59.en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/7702
dc.description.abstractFunctional indicators are being increasingly used to assess waterway health but their responses to pressure in non-wadeable rivers have not been widely documented or applied in modern survey designs that provide unbiased estimates of extent. This study tests the response of river metabolism and loss in cotton strip tensile strength across a land use pressure gradient in non-wadeable rivers of northern New Zealand, and reports extent estimates for river metabolism and decomposition rates. Following adjustment for probability of selection, ecosystem respiration (ER) and gross primary production (GPP) for the target population of order 5–7 non-wadeable rivers averaged −7.3 and 4.8 g O2 mˉ² dˉ¹, respectively, with average P/R < 1 indicating dominance by heterotrophic processes. Ecosystem respiration was <−3.3 g O2 mˉ² dˉ¹ for 75% of non-wadeable river length with around 20% of length between −10 and −20 g O2 mˉ² dˉ¹. Cumulative distribution functions of cotton strength loss estimates indicated a more-or-less linear relationship with river km reflecting an even spread of decay rates (range in k 0.0007–0.2875 dˉ¹) across non-wadeable rivers regionally. A non-linear relationship with land cover was detected for GPP which was typically <5 g O2 mˉ² dˉ¹ where natural vegetation cover was below 20% and greater than 80% of upstream catchment area. For cotton strength loss, the relationship with land cover was wedge-shaped such that sites with >60% natural cover had low decay rates (<0.02 dˉ¹) with variability below this increasing as natural cover declined. Using published criteria for assessing waterway health based on ER and GPP, 232–298 km (20–29%) of non-wadeable river length was considered to have severely impaired ecosystem functioning, and 436–530 km (42–50%) had no evidence of impact on river metabolism.en_NZ
dc.language.isoenen_NZ
dc.publisherElsevieren_NZ
dc.relation.ispartofEcological Indicators
dc.relation.urihttp://www.sciencedirect.com/science/article/pii/S1470160X13001738en_NZ
dc.subjectmetabolismen_NZ
dc.subjectecosystem respirationen_NZ
dc.subjectgross primary productionen_NZ
dc.subjectP/Ren_NZ
dc.subjectcelluloseen_NZ
dc.subjectdecay rateen_NZ
dc.subjectlarge riveren_NZ
dc.titleExtent estimates and land cover relationships for functional indicators in non-wadeable riversen_NZ
dc.typeJournal Articleen_NZ
dc.identifier.doi10.1016/j.ecolind.2013.04.010en_NZ
dc.relation.isPartOfEcological Indicatorsen_NZ
pubs.begin-page53en_NZ
pubs.elements-id38503
pubs.end-page59en_NZ
pubs.volume34en_NZ
uow.identifier.article-noCen_NZ


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record