The realised niche of the helmeted honeyeater, in terms of the floristic and structural attributes of the vegetation, was determined using logistic discrimination. The vegetation was divided into two communities, Eucalyptus camphora swampland and E. viminalis-dominated riparian forest, based on differences observed in other studies on foraging behaviour within these two communities. The variables describing the realised niche of the helmeted honeyeater in the E. camphora community were a high bark index, a large number of E. camphora stems and the presence of surface water. The results for the E. viminalis community were less conclusive, but suggest that a deep eucalypt canopy may be important. These variables relate to the feeding and breeding biology of the helmeted honeyeater. Habitat models of this form will allow appropriate habitat management strategies for Yellingbo State Nature Reserve to be developed, as well as allow the suitability of potential helmeted honeyeater release or relocation sites to be assessed.
On the Pancontinental Jabiluka exploration lease, between July 1979 and September 1981, mammals of 30 native and five introduced species were recorded, with an overall trap success rate of 5% and an average of 1.9 sightings per spotlight-hour. Three major groups of mammal species corresponded to the primary groupings of vegetation in the study area: riparian woodland, dryland woodland and open forest, and sandstone. This last group was subdivided into three on site preferences. Two ungrouped species were found in a variety of habitats. The distribution of mammals was very patchy, and their abundance varied seasonally. This may result from rainfall patterns, fire occurrence and fire history, as well as from landform and edaphic factors. The species responded to the variation in environment and the consequent mosaic of habitats by three strategies: by rapid response to changes in microhabitat through increased dispersion or moving to more favourable habitats, by restriction to stable habitats, or by adaptation to a variety of habitats.
Numerical cladistic and phenetic analyses were undertaken on allozyme and morphometric data from 11 populations of the south-western Australian granite rock mallee Eucalyptus caesia. Differing minimum-length Wagner networks were obtained from both the continuous and binary coded allozyme and morphometric data sets. Pooling the continuous allozyme and morphometric data sets, or analysing the morphometric data set alone, gave the most biogeographically parsimonious networks. These analyses suggest that, of the two subspecies of E. caesia, magna is monophyletic while caesia is paraphyletic. Magna probably was derived from an ancestral population of caesia to which the extant Yanneymooning Hill caesia population shares the closest phylogenetic relationship. The most western caesia population bears the closest affinity to the putative ancestor of the species as a whole, and a sequence of increasingly derived caesia populations occurs eastwards, as does the derived subspecies magna. In most cases, equally plausible and largely congruent phylogenetic reconstructions were obtained using either cladistic or phenetic analyses of the same data sets in E. caesia. The possible occurrence of interpopulational hybridization between neighbouring populations and of differential rates of allozyme and morphometric character state changes may have introduced errors in the phylogenetic reconstructions obtained by cladistic and phenetic methods.
This study aimed to investigate the extent of habitat overlap and competition between helmeted honeyeaters and bell miners at Yellingbo State Nature Reserve by comparing the structural attributes of occupied habitat, the spatial distribution of suitable and occupied habitat, and the reoccupation of former habitat by the helmeted honeyeater following bell miner removal. The results suggest that little niche overlap occurs between the two honeyeaters, at least within the range of structural attributes measured in the study, and that competition appears to be for space rather than any other limiting resource. It is concluded that, in the short term, the best way to minimise the conflict between the two honeyeaters and favour the expansion of helmeted honeyeaters is to remove bell miners from adjacent habitat.
Numerical cladistic and phenetic analyses were undertaken on morphometric data from 22 Western Australian populations of the southern Australian shrub Boronia inornata and from the southern Western Australian tree Eucalyptus diptera and its unnamed allies. The E. diptera species complex includes four taxa, three of which are at present unnamed. These species are largely allopatric, although in one location the ranges of two species overlap. Two subspecies of Boronia inornata are described and one of them, subsp. leptophylla, contains three informal variants. Subsp. inornata and two of the variants of subsp. leptophylla are restricted to Western Australia. One variant of subsp. leptophylla is sympatric with subsp. inornata in Western Australia and also occurs in southern South Australia. The events which gave rise to the four species of the E. diptera complex and to the subspecies and variants of B. inornata occurred within the semiarid mallee zone of Western Australia, probably during the Quaternary. Speciation has occurred in a replacement pattern across the southern transitional rainfall zone, which is reflected in at least one other, unrelated taxon.
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