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Full-Text Articles in Life Sciences
Phenotypic Leaf Variation In Avicennia Marina In Tropical Australia: Can Discrete Subpopulations Be Recognised In The Field?, Peter Saenger, Lyndon O. Brooks
Phenotypic Leaf Variation In Avicennia Marina In Tropical Australia: Can Discrete Subpopulations Be Recognised In The Field?, Peter Saenger, Lyndon O. Brooks
Dr Lyndon O Brooks
The geographic patterns of phenotypic variation in leaf morphology traits were studied in the mangrove Avicennia marina (Forsk.) Vierh. in tropical Queensland, Australia, to determine whether discrete subpopulations could be recognised in the field. Significant differences in the various leaf characters occurred among the sites, which were not explained by longitude or latitude, nor by inter-site distances. Hierarchical cluster analysis of the estimated site means showed no coherent geographical groupings of the sites, suggesting that site populations do not follow a differentiation by distance model. Principal component analysis showed that site groupings with consistent leaf morphological characteristics could be identified, …
Growth And Species Interactions Of Eucalyptus Pellita In A Mixed And Monoculture Plantation In The Humid Tropics Of North Queensland, Mila Bristow, Jerome K. Vanclay, Lyndon O. Brooks, Mark Hunt
Growth And Species Interactions Of Eucalyptus Pellita In A Mixed And Monoculture Plantation In The Humid Tropics Of North Queensland, Mila Bristow, Jerome K. Vanclay, Lyndon O. Brooks, Mark Hunt
Dr Lyndon O Brooks
This study investigated whether mixed-species designs can increase the growth of a tropical eucalypt when compared to monocultures. Monocultures of Eucalyptus pellita (E) and Acacia peregrina (A) and mixtures in various proportions (75E:25A, 50E:50A, 25E:75A) were planted in a replacement series design on the Atherton Tablelands of north Queensland, Australia. High mortality in the establishment phase due to repeated damage by tropical cyclones altered the trial design. Effects of experimental designs on tree growth were estimated using a linear mixed effects model with restricted maximum likelihood analysis (REML). Volume growth of individual eucalypt trees were positively affected by the presence …
Modelling Growth, Recruitments And Mortality To Describe And Simulate Dynamics Of Subtropical Rainforests Following Different Levels Of Disturbance, Maina Kariuki, Robert M. Kooyman, Lyndon O. Brooks, R Geoff B. Smith, Jerome K. Vanclay
Modelling Growth, Recruitments And Mortality To Describe And Simulate Dynamics Of Subtropical Rainforests Following Different Levels Of Disturbance, Maina Kariuki, Robert M. Kooyman, Lyndon O. Brooks, R Geoff B. Smith, Jerome K. Vanclay
Dr Lyndon O Brooks
The capacity of rainforests to recover from logging disturbance is difficult to model due to the compounding interactions between long-term disturbance effects, natural dynamics, site characteristics and tree species regeneration strategies. The aim of this study was to develop a quantitative model using over three decades of data from stands subjected to various levels of disturbance ranging from natural, through increasing intensities of tree removal to intensive logging. Data for trees ¡Ý 10 cm diameter at 1.3 m above the ground (dbh) in subtropical rainforest of north-east New South Wales, Australia were used. Botanical identity of trees at species level, …