Show simple item record  

dc.contributor.authorHicks, Brendan J.
dc.contributor.authorTana, Raymond
dc.date.accessioned2013-04-04T20:13:57Z
dc.date.available2013-04-04T20:13:57Z
dc.date.issued2012
dc.identifier.citationHicks, B.J. & Tana, R. (2012). Influence of open and closed river systems on the migrations of two northern New Zealand populations of banded kokopu (Galaxias fasciatus). New Zealand Natural Sciences, 37, 24-34.en_NZ
dc.identifier.issn0113-7492
dc.identifier.urihttps://hdl.handle.net/10289/7418
dc.description.abstractOtolith microchemical analysis by laser ablation inductively coupled mass spectrometry (ICP-MS) was used to investigate the migratory life histories of banded kokopu (Galaxias fasciatus) in two streams on the North Island of New Zealand. Known differences in marine and freshwater chemistry were used as a premise to document the migratory life strategies of banded kokopu between these environments. More specifically, temporal trends in high and low strontium/calcium ratios (Sr/Ca) identified in fish otoliths were used to determine evidence of migration between fresh and saltwater environments. Trace element analysis of fish captured above the Whau Valley Reservoir reflected non-migratory life histories and exhibited consistently low Sr/Ca ratios across the entire otolith. However, one fish from above the reservoir indicated unusually high Sr/Ca ratios in early adulthood. These high Sr levels were attributed to localised inputs from mineral-rich seepages associated with past mining practices in the region and low calcium availability within the Pukenui Stream. Otoliths from banded kokopu collected from Komiti Stream were shown to be migratory with a marine larval stage (high Sr/Ca ratio levels at the otolith nucleus), followed by a freshwater adult phase (low Sr/Ca ratio levels towards the edge) indicating their amphidromous origins. The study provides further evidence of non-diadromous recruitment for banded kokopu as a consequence of a large in-stream barrier and will add to the known distribution of landlocked species in New Zealand.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherNew Zealand Natural Sciencesen_NZ
dc.relation.urihttp://www.nznaturalsciences.org.nz/en_NZ
dc.rightsThis article is published in the journal: New Zealand Natural Sciences. © 2012 New Zealand Natural Sciences.en_NZ
dc.subjectbanded kokopuen_NZ
dc.subjectGalaxias fasciatusen_NZ
dc.subjectdiadromyen_NZ
dc.subjectotolith microchemistryen_NZ
dc.subjectlandlockeden_NZ
dc.subjectlaser ablation ICP-MSen_NZ
dc.titleInfluence of open and closed river systems on the migrations of two northern New Zealand populations of banded kokopu (Galaxias fasciatus)en_NZ
dc.typeJournal Articleen_NZ
dc.relation.isPartOfNew Zealand Natural Sciencesen_NZ
pubs.begin-page25en_NZ
pubs.elements-id38752
pubs.end-page36en_NZ
pubs.volume37en_NZ


Files in this item

This item appears in the following Collection(s)

Show simple item record