Spawning activity of the Australian lungfish Neoceratodus forsteri in an impoundment

Roberts, D. T., Mallett, S., Kruck, N. C., Loh, W. and Tibbetts, I. (2014) Spawning activity of the Australian lungfish Neoceratodus forsteri in an impoundment. Journal of Fish Biology, 84 1: 163-177. doi:10.1111/jfb.12264


Author Roberts, D. T.
Mallett, S.
Kruck, N. C.
Loh, W.
Tibbetts, I.
Title Spawning activity of the Australian lungfish Neoceratodus forsteri in an impoundment
Formatted title
Spawning activity of the Australian lungfish Neoceratodus forsteri in an impoundment
Journal name Journal of Fish Biology   Check publisher's open access policy
ISSN 0022-1112
1095-8649
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1111/jfb.12264
Open Access Status Not yet assessed
Volume 84
Issue 1
Start page 163
End page 177
Total pages 15
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell
Language eng
Abstract This study assessed the spawning activity of the threatened Australian lungfish Neoceratodus forsteri by measuring egg densities within the artificial habitat of a large impoundment (Lake Wivenhoe, Australia). Eggs were sampled (August to November 2009) from multiple locations across the impoundment, but occurred at highest densities in water shallower than 40cm along shorelines with a dense cover of submerged terrestrial vegetation. The numbers of eggs declined over the study period and all samples were dominated by early developmental stages and high proportions of unviable eggs. The quality of the littoral spawning habitats declined over the study as flooded terrestrial grasses decomposed and filamentous algae coverage increased. Water temperatures at the spawning site exhibited extreme variations, ranging over 204 degrees C in water shallower than 5cm. Dissolved oxygen concentrations regularly declined to <1mgl(-1) at 40 and 80cm water depth. Spawning habitats utilised by N. forsteri within impoundments expose embryos to increased risk of desiccation or excessive submergence through water-level variations, and extremes in temperature and dissolved oxygen concentration that present numerous challenges for successful spawning and recruitment of N. forsteri in large impoundment environments.
Formatted abstract
This study assessed the spawning activity of the threatened Australian lungfish Neoceratodus forsteri by measuring egg densities within the artificial habitat of a large impoundment (Lake Wivenhoe, Australia). Eggs were sampled (August to November 2009) from multiple locations across the impoundment, but occurred at highest densities in water shallower than 40cm along shorelines with a dense cover of submerged terrestrial vegetation. The numbers of eggs declined over the study period and all samples were dominated by early developmental stages and high proportions of unviable eggs. The quality of the littoral spawning habitats declined over the study as flooded terrestrial grasses decomposed and filamentous algae coverage increased. Water temperatures at the spawning site exhibited extreme variations, ranging over 20·4°C in water shallower than 5cm. Dissolved oxygen concentrations regularly declined to <1mgl-1 at 40 and 80cm water depth. Spawning habitats utilised by N. forsteri within impoundments expose embryos to increased risk of desiccation or excessive submergence through water-level variations, and extremes in temperature and dissolved oxygen concentration that present numerous challenges for successful spawning and recruitment of N. forsteri in large impoundment environments.
Keyword Littoral habitat
Recruitment
Reservoir
Spawning
Vulnerable species
Water-level variation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Centre for Marine Studies Publications
 
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