Some life history responses of the cladoceran Ceriodaphnia cf. dubia to variations in population density at two different food concentrations

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Show simple item record Rose, RM Warne, MSJ Lim, RP 2009-06-26T04:11:08Z 2002-08-01
dc.identifier.citation Hydrobiologia, 2002, 481 pp. 157 - 164
dc.identifier.issn 0018-8158
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract The combined effects of food concentration and population density on some life history characteristics of the small-bodied cladoceran Ceriodaphnia cf. dubia were studied by examining animals maintained at densities of 100-3000 individuals 1-1 for 8 days that had been fed either abundant (30 × 104 algal cells ml-1 ind-1) or limited (5 × 104 algal cells ml-1 ind-1) food. The amount of food provided significantly (p<0.05) affected the density at which the cladocerans produced fewer neonates. Cladocerans maintained at 1000 ind 1-1 produced significantly (p<0.05) fewer neonates than those at 100 or 200 ind 1-1 when fed abundant food, while cladocerans fed limited food showed a statistically significant (p<0.05) reduction in fecundity at 500 ind 1-1 compared to those at 100 or 200 ind 1-1. There was a general trend towards decreased age at sexual maturity with increased cladoceran density, and a significant (p<0.05) decrease in the age at sexual maturity for cladocerans maintained at 3000 ind 1-1 was observed in some experiments. Sexual reproduction, as indicated by the presence of resting eggs, was observed in animals maintained at 2000 and 3000 ind 1-1 and fed limited food. This indicated that, for the range of densities and food concentrations tested, a combination of crowding and limited food was required to induce sexual reproduction. Increasing the food concentration while maintaining a constant cladoceran density lead to significantly (p<0.05) increased reproduction, and no significant (p>0.05) effect on the age at sexual maturity. This indicated that the effects observed in crowded animals were not the result of negative effects due to the increased food concentrations, but were an adaptive response to crowding.
dc.language eng
dc.relation.isbasedon 10.1023/A:1021225423730
dc.title Some life history responses of the cladoceran Ceriodaphnia cf. dubia to variations in population density at two different food concentrations
dc.type Journal Article
dc.description.version Published
dc.description.version Published
dc.description.version Published
dc.parent Hydrobiologia
dc.journal.volume 481
dc.journal.number 1-3 en_US
dc.publocation Dordrecht en_US
dc.identifier.startpage 157 en_US
dc.identifier.endpage 164 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.for 050102 Ecosystem Function
dc.personcode 870336
dc.personcode 0000016598
dc.percentage 70 en_US Ecosystem Function en_US
dc.classification.type FOR-08 en_US
dc.description.keywords Allelopathy
dc.description.keywords Ceriodaphnia cf. dubia
dc.description.keywords Food concentration
dc.description.keywords Life history
dc.description.keywords Negative interference
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
utslib.collection.history School of the Environment (ID: 344)
utslib.collection.history General Collection (ID: 346) [2015-05-15T14:11:16+10:00]
utslib.collection.history Closed (ID: 3)

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