An Aerial Survey of Potential Nesting Areas of the Saltwater Crocodile, Crocodylus porosus Schneider, on the North Coast of Arnehem Land, Northern Australia

1978 ◽  
Vol 5 (3) ◽  
pp. 401 ◽  
Author(s):  
WE Magnusson ◽  
GC Grigg ◽  
JA Taylor
Keyword(s):  
Coastal Wetlands ◽  
Aerial Survey ◽  
North Coast ◽  
Northern Australia ◽  
National Library ◽  
The North ◽  
Arnhem Land ◽  
Saltwater Crocodile ◽  
Different Types ◽  
Crocodylus Porosus

Results of a study of habitats used by C, povosus for nesting on the Liverpool and Tomkinson Rivers, Arnhem Land, northern Australia, are presented. These were used as the basis of an aerial survey for potential crocodile nesting habitat in coastal wetlands between Smith Point (Cobourg Peninsula) and Gove. General conclusions of the survey are given, and areas in which different types of management could be applied are indicated. Detailed results are lodged with the Australian National Library,Canberra (catalogue No. MS5640).

Morphometric analysis of Crocodylus porosus from the north coast of Arnhem Land, Northern Australia

1978 ◽  
Vol 26 (1) ◽  
pp. 1 ◽  
Author(s):  
. Webb.G.J.W ◽  
H Messel
Keyword(s):  
Body Size ◽  
Specific Problem ◽  
Maximum Size ◽  
The Body ◽  
Tissue Loss ◽  
North Coast ◽  
Northern Australia ◽  
The North ◽  
Crocodylus Porosus ◽  
Mandibular Teeth

Utilizing measurements from 1354 C. porosus, we have derived formulae for predicting snout-vent length from 17 other attributes. The specific problem of predicting body size from an isolated head or skull is treated separately and some data are presented on proportional tissue loss in skull preparation. Sexual dimorphism was examined, and is demonstrated in interocular width, the width at the midpoint of the cranial platform, and the length of the tail. Discriminant analysis has been used to distinguish males from females on the basis of external measurements of both the whole animal and the isolated head. Hatchling C. porosus from Arnhem Bay and the Blyth River have longer heads than those from the Liverpool River. C. porosus from Sarawak have longer tails and are heavier than those from northern Australia. Predicting the maximum size of C. porosus from large skulls in museums is difficult because of variations in basic skull shape. The body size at which mandibular teeth protrude through the premaxilla is quantified.

scholarly journals Distribution and conservation status of the Antillean manatee (Trichechus manatus manatus) in Honduras

2014 ◽  
Vol 9 (2) ◽  
pp. 123-131
Author(s):  
Daniel Gonzalez-Socoloske ◽  
Cynthia R. Taylor ◽  
Olivia R. Rendon Thompson
Keyword(s):  
Public Awareness ◽  
Conservation Status ◽  
Aerial Survey ◽  
Current Status ◽  
Eastern Coast ◽  
North Coast ◽  
Rapid Population Growth ◽  
Conservation Areas ◽  
Trichechus Manatus ◽  
The North

The Antillean manatee, Trichechus manatus manatus, is among the most threatened mammals in Honduras, yet the last published study is from 1980. Since then, the North Coast of Honduras has experienced rapid population growth and land cover change possibly causing habitat loss for manatees. We conducted aerial, boat, and interview surveys between 2005-2007 along the northern and remote eastern coasts of Honduras to assess the current status and distribution of manatees. In addition, we compiled all available data on manatee mortality from museum specimens, unpublished reports, and interviews to determine current threats. We averaged 1.2 manatee sightings per survey hour during six flights along the North Coast in March-April 2006 during 14.4 aerial survey hours. Sightings were mainly clustered in Cuero y Salado Wildlife Refuge (CSWR) and Rios Chapagua and Aguan, which we indentify as important conservation areas. Our total and average sightings per survey hour in CSWR were much lower than those reported in 1979-80, in spite of the area being protected since 1987. Our interviews indicate that manatees are still present on the eastern coast (La Mosquitia), however we observed none during 14.5 survey hours in June 2005 and April 2007. The major cause of known mortality from 1970-2007, based on 26 records, was due to entanglement in fishnets. Despite local and federal protection, manatees are still poached and opportunistically caught in fishnets. While some efforts have been made by local NGOs to raise public awareness for manatees, a national conservation program is highly recommended to centralize and coordinate efforts.

The Foods and Feeding Habits of Subadult Crocodylus Porosus Schneider in Northern Australia.

1979 ◽  
Vol 6 (3) ◽  
pp. 347 ◽  
Author(s):  
JA Taylor
Keyword(s):  
Feeding Habits ◽  
Stomach Contents ◽  
Northern Territory ◽  
Northern Australia ◽  
Wet Season ◽  
Flood Plains ◽  
Significant Difference ◽  
Arnhem Land ◽  
Crocodylus Porosus ◽  
Slow Moving

Stomach contents were studied for 289 live young crocodiles (Crocodylus porosus) less than 180 cm long, collected from coast, river and swamp of Arnhem Land, Melville Island and Grant Island, Northern Territory, Australia; the crocodiles were then released. Tables give orders and families and some generic and specific names for prey or carrion eaten and for 3 parasites on the crocodiles, for a dry and a wet season in 1975-76. Between crocodiles 50 to 120 cm long and those smaller or larger there was no significant difference in the proportion of crocodiles having eaten crabs, shrimps, fish or insects or with empty stomachs, but only the larger crocodiles ate mammals or birds. Frequency of different foods eaten differed significantly with type of habitat or with salinity. Weight of food or incidence of empty stomachs did not differ between seasons, habitats or salinities. Condition of the crocodiles was significantly poorer for those from freshwater swamps than for those from lower mangrove or flood plains, and highest for those from upper mangrove. Main foods in both seasons were crustaceans, mainly crabs of subfamily Sesarminae and shrimps of genus Macrobrachium. The only fish eaten regularly was Pseudogobius sp., a slow-moving fish found by the water's edge. Amphibians were not found in the stomach.

Arnhem Land prehistory in landscape, stone and paint

Antiquity ◽  
1995 ◽  
Vol 69 (265) ◽  
pp. 676-695 ◽  
Author(s):  
Paul S. C. Taçon ◽  
Sally Brockwell
Keyword(s):  
History Matching ◽  
Small Area ◽  
Rock Art ◽  
Landscape History ◽  
North Coast ◽  
Human Presence ◽  
Great Time ◽  
The North ◽  
Arnhem Land ◽  
Complex Landscape

Western Arnhem Land is a small area (by Australian standards) on the north coast where remarkable sequences of sediment illuminate its complex landscape history. Matching the enviromental succession is an archaeological sequence with lithic sites running back into the Pleistocene. The famous richness of the region's rock-art also documents the human presence, again over a great time-depth, and gives a direct report of how ancient Arnhem Landers depicted themselves. By ‘bridging’ between these three themes, a rare and perhaps unique synthesis can be built.

Habitat Required for Nesting by Crocodylus porosus (Reptilia : Crocodilidae)

1980 ◽  
Vol 7 (1) ◽  
pp. 149 ◽  
Author(s):  
WE Magnusson
Keyword(s):  
Discriminant Function ◽  
Discriminant Function Analysis ◽  
Function Analysis ◽  
Angular Deviation ◽  
Northern Australia ◽  
North West ◽  
Nest Sites ◽  
The North ◽  
Nesting Sites ◽  
Crocodylus Porosus

C. povosus in northern Australia does not use all available vegetation for making nests, but those materials that it does use are used in proportion to their availability. Discriminant function analysis was used to quantify the suitability of sites for nesting in terms of vegetation. Crocodiles do not select sites for nests only on the basis of available nesting materials; most nests are made on the north-west banks of rivers (mean direction: 293", angular deviation 61"). There are at least 933 suitable nesting sites for C. porosus on the Liverpool and Tomkinson Rivers. This suggests that the present population of adult crocodiles could increase by a factor of 18 before nest sites became limiting.

scholarly journals A new bent-toed gecko (Squamata: Gekkonidae: Cyrtodactylus) from the Kimberley region, Western Australia

Zootaxa ◽  
2012 ◽  
Vol 3187 (1) ◽  
pp. 33 ◽  
Author(s):  
AARON M. BAUER ◽  
PAUL DOUGHTY
Keyword(s):  
New Species ◽  
Western Australia ◽  
Gravid Female ◽  
North Coast ◽  
Northern Australia ◽  
The North ◽  
Skin Fold ◽  
Female Holotype ◽  
Cape York ◽  
Dorsal Pattern

A diminutive new species of Cyrtodactylus is described from East Montalivet Island off the north coast of the Kimberley regionof Western Australia. Cyrtodactylus kimberleyensis sp. nov. may be distinguished from all other congeners by its small size(gravid female holotype 45 mm SVL), its lack of enlarged subcaudal plates, 16–18 rows of dorsal tubercles, weakly developedventrolateral skin fold, and dorsal pattern lacking dark transverse bands and enlarged blotches. The new species is one of thesmallest in the genus and is the first Cyrtodactylus known from Western Australia. It is not closely related to the large-bodiedspecies of the Cape York Peninsula, Queensland, but rather has affinities to small to mid-sized species occurring on Timor and in the Lesser Sundas, and thus represents a second pathway of colonization of northern Australia.

The Nesting of Crocodylus porosus in Arnhem Land, Northern Australia

Copeia ◽  
1977 ◽  
Vol 1977 (2) ◽  
pp. 238 ◽  
Author(s):  
Grahame J. W. Webb ◽  
Harry Messel ◽  
William Magnusson
Keyword(s):  
Northern Australia ◽  
Arnhem Land ◽  
Crocodylus Porosus

Population-Dynamics and Status of Crocodylus-Porosus in the Tidal Waterways of Northern Australia

1986 ◽  
Vol 13 (1) ◽  
pp. 71 ◽  
Author(s):  
H Messel ◽  
GC Vorlicek
Keyword(s):  
Population Dynamics ◽  
Population Model ◽  
Total Population ◽  
Population Management ◽  
Northern Australia ◽  
Night Time ◽  
Management Implications ◽  
Arnhem Land ◽  
Crocodylus Porosus ◽  
Large Animals

The results of 10 years of systematic, standardized, night-time surveys of C. porosus in c. 100 tidal waterways in northern Australia are presented. One group of waterways in Arnhem Land has been studied intensively, especially over the last 4 years; others have been surveyed at least once and many several times. The results indicate a basically steady total population, with some signs of an increase in the proportion of large animals. As total protection has been accorded C. porosus since 1972, these results are perhaps surprising. The results of our surveys and studies have allowed a picture of C. porosus population dynamics in northern Australia to be developed, and this is presented in some detail. It enables us to account in a consistent fashion for the results of the surveys and to predict results to be expected on future surveys. The results also enable us to make an assessment of the overall status of C. porosus in northern Australia, and of the prospects for recovery of the population. Management implications of the results and population model are also discussed.

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