scholarly journals Diversity and ecology of Pilargidae (Annelida: Polychaeta) from the Gulf of Carpentaria and Arafura Sea, northern Australia

Zoosymposia ◽  
2009 ◽  
Vol 2 (1) ◽  
pp. 537-550
Author(s):  
SHONA A. HOCKNULL ◽  
CHRISTOPHER J. GLASBY
Keyword(s):  
Species Composition ◽  
Distribution Patterns ◽  
Sediment Type ◽  
Geological History ◽  
Northern Australia ◽  
Sediment Types ◽  
Arafura Sea ◽  
History Of ◽  
Unit Depth ◽  
Sand And Gravel

This study identifies to species or species units 572 lots (>1000 specimens) of pilargids from six localities in the Arafura Sea and Gulf of Carpentaria (including the ports at Gove and McArthur River). We analyze the taxonomic data against geomorphic unit, depth, and sediment type. Preliminary results show that pilargid fauna of northern Australia comprises 13 species in seven genera (Ancistrosyllis, Cabira, Litocorsa, Loandalia, Pilargis, Sigambra, and Synelmis). Although all four localities have a similar diversity of species (six or seven species each), the species composition differs between each region: Litocorsa annamita and Synelmis rigida were found in all sediment types in the Arafura Sea and Gulf of Carpentaria; Ancistrosyllis cf. hartmanae (mud and sand dominated sediments only) and Sigambra pettiboneae (all sediment types) were restricted to the inshore localities of Gove and McArthur River; Loandalia gladstonensis and Sigambra sp. 2 were found on the shelf and in the inshore habitats of the Gulf of Carpentaria only; Litocorsa sp. ‘arafura’, Sigambra sp. ‘arafura’ and Synelmis gibbsi were found only in the Arafura Sea, with sediments dominated by sand and gravel; and Cabira sp. 1 and Sigambra cf. tentaculata were found at all locations, in all sediment types. Based on these distribution patterns and the Recent Quaternary geological history of the area, hypotheses of post-glacial colonization of the Gulf of Carpentaria are presented. The pilargid species composition in northern Australia is also compared to neighboring Indo-west Pacific regions.

The distribution of red, yellow and grey earths in the Torrens Creek area, central north Queensland

Soil Research ◽  
1982 ◽  
Vol 20 (1) ◽  
pp. 1 ◽  
Author(s):  
RJ Coventry
Keyword(s):  
Sedimentary Rock ◽  
Distribution Patterns ◽  
Northern Australia ◽  
Weathered Rock ◽  
South West ◽  
Tropical Area ◽  
History Of ◽  
Lower Slope ◽  
Hydrological Regimes ◽  
Different Soils

Red, yellow, and grey earths mantle extensive plains in northern Australia. They have been studied in a semiarid, tropical area at Torrens Creek, some 200-300 km south-west of Townsville, Queensland. An examination of boreholes drilled along transects across these soils shows that the red earths usually occupy the lower slope sites and broad, non-channeled, drainage lines. The yellow and grey earths generally occur at midslope sites or over broadly convex upper regions of the low undulations that rise 10-30 m above the non-dissected parts of the plains. The distribution patterns of the red, yellow, and grey earths cannot be explained by differential weathering of the gently dipping Mesozoic sedimentary rock substrates. Nor can they be attributed to simple, topography-controlled, hydrological regimes in the soils. The distribution patterns of the different soils depend on factors related to the geology and the late Cainozoic geomorphic history of the area. These include the transported or sedentary nature of the soil parent materials, the hydrological regimes of the soils and of the weathered rock substrates, and the depth to the underlying, weathered rock.

LATE QUATERNARY GEOLOGICAL HISTORY OF RIO GRANGE DO SUL COASTAL PLAIN, SOUTHERN BRAZIL

2000 ◽  
Vol 30 (3) ◽  
pp. 474-476 ◽  
Author(s):  
LUIZ JOSÉ TOMAZELLI ◽  
SÉRGIO REBELLO DILLENBURG ◽  
JORGE ALBERTO VILLWOCK
Keyword(s):  
Coastal Plain ◽  
Late Quaternary ◽  
Geological History ◽  
Southern Brazil ◽  
History Of

Geoinformation Mapping Through the Types of Geological and Geomorphological Structure of the Katun Valley (Altay Mountains) Based on Morphometric Indicators

2018 ◽  
Vol 938 (8) ◽  
pp. 38-43
Author(s):  
S.A. Kotler ◽  
I.D. Zolnikov ◽  
D.V. Pchelnikov
Keyword(s):  
Morphometric Parameters ◽  
Morphometric Parameter ◽  
Geological History ◽  
Mountain Rivers ◽  
Quaternary Period ◽  
Modern Variety ◽  
Altay Mountains ◽  
History Of

The types of geological and geomorphological structure of the Katun valley are distinguished in the work. For this, a method of geoinformation mapping using morphometric indicators of the valley’s width and meandering of the channel was developed. The morphometric parameter of the valley’s width was calculated as the total area of terraces. As the morphometric parameters of the channel’s meandering, the angles of the river segments’ deviation relative to each other were calculated. Conjugated analysis of these morphometric indicators enabled identifying 18 morphotypes. These morphotypes according to the geological and geomorphological structure of the valley were combined into 4 classes. Separation of the Katun valley in certain classes and morphotypes is due to the different geological history of these sites during the Quaternary period. The most important reasons predetermining the modern variety of geological and geomorphological types of the valley are neotectonic movements and exogenous phenomena (glaciers, dam lakes, landslides, etc.) naturally localized in the space from the upstream of the river to its exit into the foothills. The developed method can be applied for quantitative morphometric classification of the mountain rivers’ valleys in other regions.

BORON ISOTOPES AS TRACERS OF THE TECTONIC ORIGIN AND GEOLOGICAL HISTORY OF SERPENTINITES IN SUBDUCTION AND SUTURE ZONES

2016 ◽  
Author(s):  
Celine Martin ◽  
◽  
George E. Harlow ◽  
George E. Harlow ◽  
George E. Harlow ◽  
...  
Keyword(s):  
Boron Isotopes ◽  
Geological History ◽  
History Of ◽  
Tectonic Origin

Metal burial: Understanding caching behaviour and contact material culture in Australia's NE Kimberley

2021 ◽  
Vol 21 (1) ◽  
pp. 28-52
Author(s):  
Sam Harper ◽  
Ian Waina ◽  
Ambrose Chalarimeri ◽  
Sven Ouzman ◽  
Martin Porr ◽  
...  
Keyword(s):  
Material Culture ◽  
Cultural Practices ◽  
Raw Materials ◽  
Cross Cultural ◽  
Contact Material ◽  
Northern Australia ◽  
Assemblage Theory ◽  
Close Proximity ◽  
History Of ◽  
Human Burials

This paper explores identity and the recursive impacts of cross-cultural colonial encounters on individuals, cultural materials, and cultural practices in 20th-century northern Australia. We focus on an assemblage of cached metal objects and associated cultural materials that embody both Aboriginal tradition and innovation. These cultural materials were wrapped in paperbark and placed within a ring of stones, a bundling practice also seen in human burials in this region. This ‘cache' is located in close proximity to rockshelters with rich, superimposed Aboriginal rock art compositions. However, the cache shelter has no visible art, despite available wall space. The site shows the utilisation of metal objects as new raw materials that use traditional techniques to manufacture a ground edge metal axe and to sharpen metal rods into spears. We contextualise these objects and their hypothesised owner(s) within narratives of invasion/contact and the ensuing pastoral history of this region. Assemblage theory affords us an appropriate theoretical lens through which to bring people, places, objects, and time into conversation.

Beyond Wallace: a new lineage of Chrysorthenches (Lepidoptera: Yponomeutoidea: Glyphipterigidae) reveals a journey tracking its host-plants, Podocarpus (Pinopsida: Podocarpaceae)

2020 ◽  
Vol 190 (2) ◽  
pp. 709-736
Author(s):  
Jae-Cheon Sohn ◽  
Shigeki Kobayashi ◽  
Yutaka Yoshiyasu
Keyword(s):  
Maximum Likelihood ◽  
East Asia ◽  
Host Plants ◽  
Morphological Characters ◽  
Species Group ◽  
Geological History ◽  
Dna Barcodes ◽  
History Of ◽  
Species Groups ◽  
Maximum Likelihood Phylogeny

Abstract A northward trans-Wallacean radiation is demonstrated for Chrysorthenches, a member of the Orthenches group. Here we review Chrysorthenches and allied genera resulting in a generic transfer of Diathryptica callibrya to Chrysorthenches and two new congeners: C. muraseaeSohn & Kobayashisp. nov. from Japan and C. smaragdinaSohnsp. nov. from Thailand. We review morphological characters of Chrysorthenches and allied genera, and find polyphyly of Diathryptica and the association of the Orthenches-group with Glyphipterigidae. These findings were supported in a maximum likelihood phylogeny of DNA barcodes from ten yponomeutoids. We analysed 30 morphological characters for 12 species of Chrysorthenches, plus one outgroup, via a cladistic approach. The resulting cladogram redefined two pre-existing Chrysorthenches species-groups and identified one novel lineage: the C. callibrya species-group. We review the host associations between Chrysorthenches and Podocarpaceae, based on mapping the working phylogenies. Our review suggests that ancestral Chrysorthenches colonized Podocarpus and later shifted to other podocarp genera. Biogeographical patterns of Chrysorthenches show that they evolved long after the Podocarpaceae radiation. Disjunctive trans-Wallacean distribution of the C. callibrya species-group is possibly related to the tracking of their host-plants and the complicated geological history of the island-arc system connecting Australia and East Asia.

Assessment of loading history of compartments in the knee using bone SPECT/CT: A study combining alignment and 99mTc-HDP tracer uptake/distribution patterns

2012 ◽  
Vol 31 (2) ◽  
pp. 268-274 ◽  
Author(s):  
Michael T. Hirschmann ◽  
Stephan Schön ◽  
Faik K. Afifi ◽  
Felix Amsler ◽  
Helmut Rasch ◽  
...  
Keyword(s):  
Distribution Patterns ◽  
Tracer Uptake ◽  
Loading History ◽  
History Of ◽  
Bone Spect

scholarly journals The geological history of the Lake Rudolf Basin, Kenya colony

1939 ◽  
Vol 229 (560) ◽  
pp. 219-274 ◽  
Keyword(s):  
Rift Valley ◽  
Public Works ◽  
General Description ◽  
Geological History ◽  
East African ◽  
The Public ◽  
Geographical Society ◽  
History Of ◽  
African Rift ◽  
At Home

The Lake Rudolf Rift Valley Expedition was designed to carry out many different lines of investigation in the Lake Rudolf Basin. One of the chief of these was a study of the geological history of that part of the East African Rift Valley. The expedition was assisted financially by The Royal Society, The Geological Society of London, The Royal Geographical Society, The Percy Sladen Trustees and the Geographical and Geological Sections of the British Association. A general description of the activities of the Expedition was given in a paper read before the Royal Geographical Society (Fuchs 1935). Owing to the tragic loss of two members of the expedition, Dr W. S. Dyson and Mr W. R. H. Martin, two fruitless months were spent searching for them. Consequently a great amount of the work planned for the east side of the lake had to be abandoned. Nevertheless, the considerable distance travelled within the 50,000 sq. miles of the Rudolf Basin has enabled me to make out the chief events of its geological history. I am very much indebted to all those who assisted us in the field and at home, in particular to the Kenya Government, the Officers of the King’s African Rifles, and Mr H. L. Sikes of the Public Works Department; I would also like to thank Mr A. M. Champion, Provincial Commissioner of Turkana, who wholeheartedly assisted us in every way possible both in the field and at home, for he has placed at my disposal his own excellent topographical maps and his extensive observations on the geology of the area. I am also deeply indebted to Professor O. T. Jones, Mr Henry Woods and Mr W. Campbell Smith for their criticisms. Mr Campbell Smith has also given me provisional identifications of the rocks.

Sign in / Sign up

Export Citation Format

Share Document