Habitat and Microhabitat Distributions in Relation to Ecological Overlap in Two Species of Ranidella (Anura)

1985 ◽  
Vol 33 (3) ◽  
pp. 329 ◽  
Author(s):  
Nally RC Mac
Keyword(s):  
Volcanic Soils ◽  
Ecological Relationships ◽  
Central Victoria ◽  
Anuran Amphibians ◽  
South Central ◽  
Geographic Distributions

The geographic distributions of two species of anuran amphibians, Ranidella signifera and R. parinsignifera, were examined. The physiognomies of more than 200 sites in south central Victoria were recorded. R. signifera is ubiquitous but R. parinsigngem is restricted to low-elevation sites (<380 m) that are not underlain by quaternary volcanic soils. There is no microhabitat differentiation at sites where both species occur. These results are discussed in relation to the overall ecological relationships of these species in this region of Australia.

Geographical Elements in the Flora of Victoria

1976 ◽  
Vol 24 (2) ◽  
pp. 249 ◽  
Author(s):  
PB Bridgewater
Keyword(s):  
Plant Communities ◽  
Vascular Plants ◽  
Distribution Data ◽  
Inverse Association ◽  
Central Victoria ◽  
South Central ◽  
Southern Half ◽  
Species Groups ◽  
Geographical Elements ◽  
Very High

Distribution data for vascular plants in Victoria were recorded on grid squares of 1° latitude by 1.5° longitude. Data for six angiosperm families (Cyperaceae, Liliaceae, Chenopodiaceae, Rhamnaceae, Rutaceae and Myrtaceae) were analysed by the techniques of normal and inverse association analysis. Analyses of the data produced a series of species groups with similar geographical ranges (elements). These elements may be broadly divided into eastern and western groups, with two exceptions-one extending over the southern half of the State and the other occupying the coastal fringe. Geographical elements are helpful in defining the range of plant communities, as well as suggesting hypotheses as to the origins of floras. South central Victoria is seen to be a junction for species of both the eastern and western groups of elements, which may explain the very high number of species recorded from the Melbourne region.

The Litoria ewingi Complex (Anura:Hylidae) in South-Eastern Australia VIII.* Hybridization between L. ewingi and L. verreauxi alpina in the Mount Baw Baw Area, South Central Victoria

1985 ◽  
Vol 33 (2) ◽  
pp. 143 ◽  
Author(s):  
GF Watson ◽  
MJ Littlejohn ◽  
DF Gartside ◽  
JJ Loftus-Hills
Keyword(s):  
Northern Slope ◽  
Blood Proteins ◽  
Genetic Compatibility ◽  
Hybrid Swarm ◽  
Geographic Ranges ◽  
Central Victoria ◽  
South Central ◽  
Eastern Australia ◽  
High Level

Contacts between the geographic ranges of the widely distributed species, Litoria ewingi, and the montane-adapted taxon, L. verreauxi alpina, occur at about 1200 m on the Great Dividing Range in south central Victoria. Data for adult morphology, genetic compatibility, blood proteins (haemoglobins and transferrins), and structure of male advertisement calls, were obtained from seven populations at altitudes between 640 m and 1450 m in the region of the Mount Baw Baw Plateau. The results indicate that hybrids are present at intermediate altitudes (1140-1270 m), but that the nature of the interaction differs between overlap of parental taxa together with recombination products on the south-westem slope (the Baw Baw transect), and a hybrid swarm on the northern slope of the Mount Baw Baw plateau. Results of in vitro crosses (female L, ewingi by male L. v. alpina) indicate that there is a high level of genetic compatibility between the taxa. Estimates of the width of the hybrid zone on the Baw Baw transect vary from less than 4 km for morphology and calls, to between 10 and 24 km for blood proteins.

Geographic distributions and physiological characteristics of co-existing Flaveria species in south-central Mexico

Flora ◽  
2009 ◽  
Vol 204 (2) ◽  
pp. 89-98 ◽  
Author(s):  
Erika A. Sudderth ◽  
Francisco J. Espinosa-García ◽  
Noel M. Holbrook
Keyword(s):  
Physiological Characteristics ◽  
Central Mexico ◽  
South Central ◽  
Geographic Distributions ◽  
Flaveria Species

LIFE HISTORY, DEVELOPMENT, AND INSECT–HOST RELATIONSHIPS OF XYLEBORUS CELSUS (COLEOPTERA: SCOLYTIDAE) IN MISSOURI

1979 ◽  
Vol 111 (3) ◽  
pp. 295-304 ◽  
Author(s):  
J. A. Gagne ◽  
W. H. Kearby
Keyword(s):  
Life History ◽  
Adult Development ◽  
Ground Level ◽  
Insect Host ◽  
Above Ground Level ◽  
Ecological Relationships ◽  
South Central ◽  
Immature Development ◽  
New Hosts ◽  
Host Relationships

AbstractThe biological and ecological relationships of the hickory timber beetle, Xyleborus celsus Eichoff (Coleoptera: Scolytidae), and black hickory, Carya texana (Buckley), were studied for 2 years in south-central Missouri. X. celsus was bivoltine and overwintered as an adult. Development from egg to adult required ca. 35 days. There were three larval instars. Brood adults either extended the galleries in which they completed immature development or emerged to seek new hosts. Most attacks occurred within 1.5 m above ground level The most heavily attacked height interval in the basal 1 m of 10–17 cm D.B.H. trees varied. This variability is correlated to the temporal relation of girdling of the tree and beetle attack. Aspect of beetle attack varied at random. Conditions for X. celsus development were not uniform in the basal 1 m of infested trees.

Hook-shaped opal phytoliths in the epidermal cells of oats

1960 ◽  
Vol 8 (1) ◽  
pp. 69 ◽  
Author(s):  
G Baker
Keyword(s):  
Avena Sativa ◽  
Epidermal Cells ◽  
Solid Core ◽  
Growth Season ◽  
Opal Phytoliths ◽  
Central Victoria ◽  
The Core ◽  
South Central ◽  
Accumulator Plant ◽  
Shape And Size

Among several species of the Gramineae, Avena sativa L. (oats) is an important opal-accumulator plant in Victoria. In it, amorphous silica has been precipitated as very abundant microscopic opal phytoliths of various shapes, among which hook-shaped forms are common in alternating rows of epidermal cells. Examples studied in detail were observed within and isolatd from oats grown on basaltic soil on "Barewood Farm", approximately 2 miles north of Clarkefield in the Romsey district of South Central Victoria. They are variable in shape and size, and in their relationships to adjacent rod-like opal phytoliths that infill the lumen of several of the subepidermal cells. Each hook-shaped opal phytolith consists typically of a solid core of opal enveloped distally by a more delicate cone-like sheath of opal. The opal of the sheath is hyaline and transparent compared with the thicker, generally translucent core. Refractive index variations reveal differences between core and sheath, and between the several growth layers of slightly different composition in the sheath. These differences reflect variable ratios of silica to water in the opal of the core, the sheath, and its several layers. The hook-shaped opal phytoliths, like all other shape types secreted in short-lived plants, must have developed rapidly, because processes of opal precipitation and solidification were completed within the compass of one growth season.

The ecology of Eucalyptus regnans F. Muell.: the species and its frost resistance

1958 ◽  
Vol 6 (2) ◽  
pp. 154 ◽  
Author(s):  
DH Ashton
Keyword(s):  
Growth Rate ◽  
Frost Resistance ◽  
Organic Nitrogen ◽  
High Growth ◽  
High Growth Rate ◽  
Altitudinal Gradients ◽  
Eucalyptus Regnans ◽  
Central Victoria ◽  
South Central

The distribution, habit, and variation in Eucalyptus regnans F. Muell. are briefly described. It is shown that E. regnans almost certainly forms hybrids with E. obliqua. The seedlings of E. regnans are relatively frost-sensitive, and this sensitivity is increased by manuring with organic nitrogen. Under artificial frost, softened seedlings are killed at temperatures below 25–27°F, whilst well-hardened seedlings are killed at temperatures below 20–22°F. In the field the lethal frost temperature is some degrees lower. Ecoclines exist in the E. regnans populations in south-central Victoria. The seedlings show a gradation in both frost resistance and growth rate along altitudinal gradients. Seedlings derived from trees growing at the edge of a frost pocket at Wallaby Creek (2000 ft) combine a relatively high frost resistance (equal to that of seedlings at 3'700 ft) with a high growth rate.

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