Movement patterns of female feral camels in central and northern Australia

2001 ◽  
Vol 28 (3) ◽  
pp. 283 ◽  
Author(s):  
Glenn P. Edwards ◽  
Stephen R. Eldridge ◽  
David Wurst ◽  
David M. Berman ◽  
Vanessa Garbin
Keyword(s):  
Kernel Method ◽  
Satellite Telemetry ◽  
Movement Patterns ◽  
Annual Rainfall ◽  
Northern Australia ◽  
Buffer Zones ◽  
Movement Rates ◽  
Environmentally Sensitive Areas ◽  
Large Home Range ◽  
Pattern Of Variation

Movement patterns of female feral camels were studied over four years (February 1993 to December 1996) in central and northern Australia using satellite telemetry. Areas used over 12-month periods (calculated using the fixed kernel method) were large (449–4933 km 2 ) and increased with increasing aridity as measured by long-term mean annual rainfall. No consistent pattern of variation was detected in movement rates of camels across seasons. Data collected over several years are needed to classify movements in feral camels. The only telemetered camel that has been monitored for longer than two years (this study) appeared to move within a large home range over the concluding 3.5 years that it was tracked. Because the areas used are large, extensive buffer zones will be needed in arid regions to protect environmentally sensitive areas from the impacts of feral camels.

Variation in the morphology and flowering time of cluster clover (Trifolium glomeratum L.) and its relationship to distribution in southern Australia

1995 ◽  
Vol 46 (5) ◽  
pp. 1027 ◽  
Author(s):  
FP Smith ◽  
PS Cocks ◽  
MA Ewing
Keyword(s):  
Genetic Variation ◽  
Flowering Time ◽  
Seed Mass ◽  
Annual Rainfall ◽  
Strongly Correlated ◽  
Summer Maximum ◽  
Maximum Temperatures ◽  
Pattern Of Variation ◽  
Growth Habits

Cluster clover is a widely distributed and ecologically successful introduced legume in southern Australia. In an attempt to understand the role of genetic variation in this success, morphological and physiological traits were measured in 94 accessions from southern Australia and 6 from the Mediterranean basin. Flowering time ranged from 105 to 185 days after sowing, but was not strongly correlated with annual rainfall or length of growing season at the site of collection. Variation in other traits partitioned the populations into two morphs which, apart from flowering time and leaf marker, were largely homogeneous. The morphs differed significantly in floret number per inflorescence (22 v. 32-37) and seed mass (379 8g v. 523 8g), had different growth habits and strong within-morph associations between leaf markers and stipule and petal coloration. The morphs differed in their distributions within southern Australia and the pattern of distribution was related to summer maximum temperatures, winter minimum temperatures and spring rainfall. These results demonstrate that genetic variation has been important to the success of cluster clover and suggests that the variation is organized. The pattern of variation observed and its relationship to ecogeography is consistent with findings for other highly inbreeding species. A map of the species distribution in Western Australia is presented.

scholarly journals VERTICAL AND HORIZONTAL MOVEMENTS OF THE SCALLOPED HAMMERHEAD SHARK (SPHYRNA LEWINI) AROUND MALPELO AND COCOS ISLANDS (TROPICAL EASTERN PACIFIC) USING SATELLITE TELEMETRY

2016 ◽  
Vol 40 ◽  
Author(s):  
Sandra Bessudo ◽  
Germán A. Soler ◽  
Peter A. Klimley ◽  
James Ketchum ◽  
Randall Arauz ◽  
...  
Keyword(s):  
Satellite Telemetry ◽  
Movement Patterns ◽  
Eastern Pacific ◽  
Depth Range ◽  
Tropical Eastern Pacific ◽  
Sphyrna Lewini ◽  
Scalloped Hammerhead ◽  
Distribution Ranges ◽  
Cocos Island ◽  
Hammerhead Sharks

Understanding distribution ranges and the daily movement patterns of pelagic fishes are key aspects for the establishment and planning of protected areas for their conservation. In this study the vertical and horizontal movements of scalloped hammerhead sharks, Sphyrna lewini, were recorded in Malpelo and Cocos Island using satellite telemetry. Nine sharks were tagged with satellite transmitters during March 2006, 2007 and 2008 at Malpelo Island, and three hammerhead sharks were tagged at Cocos Island in June 2008. The sharks moved between islands in the Tropical Eastern Pacific and made regional movements from Malpelo to the south of Cocos and around the Malpelo ridge. When away from the island, sharks made infrequent nocturnal short dives down to 1000 m where temperatures were as low as 4 °C. For a shark that was tracked for five months, results indicated significant differences between the time spent at different depth ranges, as well as an interaction between depth, water layers, and the time of the day. The shark swam mostly at surface waters (0-10 m) during the cold water season, and spent more time at the deepest depth range (>100 m) during nigh time. Further long-term studies on shark movement patterns are required for a better management of this highly mobile and vulnerable species.

scholarly journals Movement and Home Range of Nile Crocodiles in Ndumo Game Reserve, South Africa

Koedoe ◽  
2015 ◽  
Vol 57 (1) ◽  
Author(s):  
Peter M. Calverley ◽  
Colleen T. Downs
Keyword(s):  
South Africa ◽  
Home Range ◽  
Satellite Telemetry ◽  
Movement Patterns ◽  
Breeding Site ◽  
Water Levels ◽  
Home Ranges ◽  
Total Length ◽  
Game Reserve ◽  
Nile Crocodile

The study of movement patterns and home range is fundamental in understanding the spatial requirements of animals and is important in generating information for the conservation and management of threatened species. Ndumo Game Reserve, in north-eastern KwaZulu-Natal, bordering Mozambique, has the third largest Nile crocodile (Crocodylus niloticus) population in South Africa. Movement patterns of 50 Nile crocodiles with a total length of between 202 cm and 472 cm were followed over a period of 18 months, using mark-resight, radio and satellite telemetry. The duration of radio transmitter attachment (131 ± 11.4 days) was significantly and negatively related to total length and reproductive status. Satellite transmitters failed after an average of 15 ± 12.5 days. Home range was calculated for individuals with 10 or more radio locations, spanning a period of at least 6 months. There was a significant relationship between home range size and total length, with sub-adults (1.5 m – 2.5 m) occupying smaller, more localised home ranges than adults (> 2.5 m). The largest home ranges were for adults (> 2.5 m). Home ranges overlapped extensively, suggesting that territoriality, if present, does not result in spatially discrete home ranges of Nile crocodiles in Ndumo Game Reserve during the dry season. Larger crocodiles moved farther and more frequently than smaller crocodiles. The reserve acts as a winter refuge and spring breeding site for an estimated 846 crocodiles, which also inhabit the Rio Maputo during the summer months. Nile crocodile movement out of the reserve and into the Rio Maputo starts in November and crocodiles return to the reserve as water levels in the floodplain recede in May.Conservation implications: Movement patterns of Nile crocodiles show the important role the reserve plays in the conservation of Nile crocodile populations within the greater Ndumo Game Reserve–Rio Maputo area.

scholarly journals Movement patterns and home range in Diplomystes camposensis (Siluriformes: Diplomystidae), an endemic and threatened species from Chile

2018 ◽  
Vol 16 (1) ◽  
Author(s):  
Alejandra Oyanedel ◽  
Evelyn Habit ◽  
Mark C. Belk ◽  
Katherin Solis-Lufí ◽  
Nicole Colin ◽  
...  
Keyword(s):  
Home Range ◽  
Radio Telemetry ◽  
High Mobility ◽  
Movement Patterns ◽  
Large River ◽  
San Pedro River ◽  
Portable Radio ◽  
Upstream Direction ◽  
Dam Building ◽  
Large Home Range

ABSTRACT We document movement patterns and home range of Diplomystes camposensis, an endemic and threatened freshwater catfish from Chile. We tracked the movements of seven individuals of different body size (13.5 to 19 cm SL) using portable radio telemetry equipment to investigate movement patterns in relation to day/night activity and habitat use in the San Pedro River (Valdivia Basin). Tracked movements and model-based analyses revealed that D. camposensis has a large home range and high mobility. The average home range was 0.068163 ± 0.033313 km2, and the average area of higher activity was 0.005646 ± 0.011386 km2. The mean linear home range was 387.4 m. The results also showed that movements were longer during the night, supporting nocturnal habits. Movements tended to be in an upstream direction for some individuals, although these differences were not significant when data was pooled. Large home range and movements suggest that the species may require large river areas to meet ecological demands, an aspect that could be severely affected by fragmentation. These results, along with previously published genetic data, suggest that the conservation of D. camposensis would be seriously threatened by hydromorphological alterations (e.g. lack of connectivity), such as those resulting from dam building.

Distribution of the native earthworm fauna of Australia - a continent-wide perspective

Soil Research ◽  
1994 ◽  
Vol 32 (1) ◽  
pp. 117 ◽  
Author(s):  
I Abbott
Keyword(s):  
Geographical Distribution ◽  
Western Australia ◽  
South Australia ◽  
Large Rivers ◽  
Annual Rainfall ◽  
Northern Australia ◽  
Distribution Map ◽  
South West ◽  
Wide Perspective ◽  
Central Australia

Based on nearly 2000 available records, the broadscale geographical distribution of the native earthworm fauna of Australia was mapped. Native earthworms were recorded from south-eastern, eastern and northern Australia within 400 km of the coast. Isolated faunas were present in Tasmania and south-west Western Australia, and apparently isolated faunas occurred in the Adelaide area/Fleurieu Peninsula of South Australia and the ranges of central Australia. All but 30 locality records occurred where annual rainfall averaged or exceeded 400 mm; 16 of these records were instances of moisture-gaining sites (moist caves, waterholes, banks of large rivers, edge of granite domes). A collecting strategy to both fill in gaps in the distribution map and discover additional anomalous occurrences (with respect to the 400 mm isohyet) is outlined.

scholarly journals Use of satellite telemetry data, GIS, and HTML to create an interactive display of caribou movements

Rangifer ◽  
2003 ◽  
Vol 23 (5) ◽  
pp. 101
Author(s):  
Alexander K. Prichard ◽  
Geoffry M. Carroll ◽  
John C. George ◽  
Stephen M. Murphy ◽  
Mike D. Smith ◽  
...  
Keyword(s):  
General Public ◽  
Annual Variation ◽  
Satellite Telemetry ◽  
Telemetry Data ◽  
Daily Movement ◽  
Movement Rates ◽  
Interactive Display ◽  
Wintering Areas

The use of animation clearly reveals the large annual variation in wintering areas and large differences in daily movement rates for this herd. This interactive display can be adapted for school groups, subsistence hunters, the general public, or scientists.

Biogeography of the ant fauna of the Tiwi Islands, in northern Australia's monsoonal tropics

2004 ◽  
Vol 52 (1) ◽  
pp. 97 ◽  
Author(s):  
Alan N. Andersen ◽  
John C. Z. Woinarski ◽  
Ben D. Hoffmann
Keyword(s):  
Northern Territory ◽  
Species Level ◽  
Annual Rainfall ◽  
Tropical Species ◽  
South East Asia ◽  
Northern Australia ◽  
Exotic Invasive Species ◽  
Exotic Invasive ◽  
Species Groups ◽  
North Western

This paper describes the biogeography at the species level of ants from the Tiwi Islands, and represents the first such analysis for any region in Australia. The Tiwi Islands are located 20 km off the mainland coast near Darwin in northern Northern Territory, and include Australia's second largest insular landmass after Tasmania. The islands receive the highest mean annual rainfall (up to 2000 mm) in monsoonal northern Australia, and they are the closest part of the Australian landmass to south-east Asia. On the basis of ~1300 species records, we list 154 species (including nine introduced) from 34 genera. The richest genera are Polyrhachis (20 species), Monomorium (15), Camponotus (14), Pheidole (12), and Iridomyrmex (11). In all, 66% of the native Tiwi species belong to Torresian (tropical) species groups, which is considerably higher than the 44% for Australia's monsoonal ant fauna as a whole. Fifteen Tiwi ant species are not known from mainland Australia. These include a species of Anonychomyrma, which is the only record of the genus in monsoonal Australia, Polyrhachis debilis, the only representative of the sub-genus Cyrtomyrma known from north-western Australia, and the only species of the araneoides group of Rhytidoponera known from the Northern Territory. Unfortunately, the Tiwi ant fauna also includes the exotic invasive species Pheidole megacephala, which represents a serious conservation threat.

A review of the taxonomic status of the New Caledonia Wattled Bat Chalinolobus neocaledonicus Revilliod, 1914 (Chiroptera: Vespertilionidae) and Chalinolobus gouldii venatoris Thomas, 1908 from northern Australia

Zootaxa ◽  
2020 ◽  
Vol 4778 (1) ◽  
pp. 135-158
Author(s):  
HARRY E PARNABY ◽  
ANJA DIVLJAN ◽  
GLENN HOYE
Keyword(s):  
New Caledonia ◽  
Taxonomic Status ◽  
Valid Species ◽  
Original Material ◽  
Northern Australia ◽  
Species Status ◽  
The Status ◽  
Cryptic Taxa ◽  
Pattern Of Variation ◽  
Analysis Of Variation

The taxonomic status of the New Caledonia Wattled Bat Chalinolobus neocaledonicus Revilliod, 1914 has remained uncertain since its synonymy with mainland Australian Gould’s Wattled Bat C. gouldii (Gray, 1841) in 1971. Although Chalinolobus neocaledonicus is now widely accepted as a valid species, this was based on a tentative taxonomic opinion published in 1995. We examined most of the original material used to justify synonymy with C. gouldii, which included the type series of C. gouldii venatoris, a small northern Australian form that superficially resembles C. neocaledonicus but is currently not generally recognised as a valid subspecies. We found consistent differences in key diagnostic external and cranial criteria that support species status for C. neocaledonicus. We also review the taxonomic status of venatoris. Contrary to previous assessments, our re-interpretation of the taxonomic literature supports subspecific recognition of venatoris. Nevertheless, we are unable to conclusively resolve the status of venatoris because a more complex pattern of variation than a simple latitudinal size cline is apparent in C. gouldii. We argue that recognition of venatoris as the northern subspecies of C. gouldii has merit, pending a comprehensive analysis of variation in mainland C. gouldii to test for the presence of cryptic taxa. 

Variations in Populations of Eucalyptus ovata Labill., And the Effects of Waterlogging on Seedling Growth

1979 ◽  
Vol 27 (3) ◽  
pp. 301 ◽  
Author(s):  
RD Clucas ◽  
PY Ladiges
Keyword(s):  
Low Frequency ◽  
Leaf Size ◽  
Annual Rainfall ◽  
Seedling Morphology ◽  
Tree Form ◽  
Ecotypic Differentiation ◽  
Mean Annual Rainfall ◽  
Open Forest ◽  
Pattern Of Variation ◽  
Eucalyptus Ovata

Techniques of classification and ordination were used to describe the pattern of variation in tree form and leaf, fruit and seedling morphology found in four southern Victorian populations, referred to as Eucalyptus ovata (swamp gum), from sites differing in mean annual rainfall, soil type and severity of waterlogging. Trees from sites with higher mean annual rainfall were large in stature (33 + m) and smooth-trunked with a variable amount of flaky bark at the base. Fruits were typical of E. ovata in shape, although their size, and that of leaves, varied from west to east from relatively large to small. In drier coastal areas in western Victoria trees may be short (5 m), multi-stemmed, large-fruited and small-leaved compared with the more common, and typical, open-forest form of the species. Seedlings from the tall open-forest forms grew rapidly, developed distinctly square stems and broad lanceolate to cordate leaves which were opposite and sessile at least to the 10th node, and had a low frequency of lignotuber development. In contrast, seedlings from open-forest forms of lower rainfall areas, and particularly from waterlogged sites, were slower-growing and morphologically more typical of the species, having round stems, oval leaves which were petiolate and alternating at the 10th node, and lignotubers. Waterlogging reduced seedling yield, leaf size and lignotuber development. All populations responded similarly to waterlogging treatment and typical responses included development of stem hypertrophy and adventitious roots which were often negatively geotropic. The pattern of variation observed in southern Victoria may reflect ecotypic differentiation, although the source of that genetic information may have been the result of past hybridization, perhaps with E. cypellocarpa or E. viminalis depending on locality.

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