Studies On Some Arctic And Baltic Astarte Species Bivalvia Mollusca

Author : G. Høpner Petersen
Publisher : Museum Tusculanum Press
ISBN 13 : 9788763512565
Total Pages : 76 pages
Book Rating : 4.64/5 ( download)

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Download or read book Studies on Some Arctic and Baltic Astarte Species (Bivalvia, Mollusca) written by G. Høpner Petersen and published by Museum Tusculanum Press. This book was released on 2001 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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ISBN 13 :
Total Pages : 456 pages
Book Rating : 4.28/5 ( download)

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Download or read book Journal of Shellfish Research written by and published by . This book was released on 2002 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Anne Birgitte Gotfredsen
Publisher : Museum Tusculanum Press
ISBN 13 : 9788763512640
Total Pages : 248 pages
Book Rating : 4.45/5 ( download)

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Download or read book Nipisat - a Saqqaq Culture Site in Sisimiut, Central West Greenland written by Anne Birgitte Gotfredsen and published by Museum Tusculanum Press. This book was released on 2004 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: From 1989 to 1994, more than 200 m2 were excavated at the Saqqaq site of Nipisat, situated on a small island 15 km south of Sisimiut. The excellent preservation conditions for organic material, and the fact that some of the stone artefacts were not previously known from the Saqqaq Culture, were the main reasons for the excavation. More than 70,000 bone fragments, 20,000 flakes and 1,000 artefacts were recovered. A total of 33 dates, making this site one of the best dated in the entire Arctic, reveal that Nipisat was occupied continuously for nearly 1,500 years. Although protruding bedrock disturbed the stratigraphy and several lenses of crushed shells interrupted the layers, three different chronological phases could be identified. Phase 1 is dated by eight 14C dates ranging from 2020 to 1740 BC (cal). Phase 2 partly overlaps, but is mainly younger than phase 1 and dated by five 14C dates to 1860-1325 BC (cal). Phase 3 is dated by 16 14C dates to 1310-810 BC (cal). One date was very young (520 BC (cal)) and problematic because of extreme oscillations of the 14C curve. From phase 1 there is a mid-passage structure with a box-hearth. A ring of flagstones surrounds the structure. From phase 2 there is a well-defined box-hearth. There was no clear outline of a tent ring surrounding the hearth, which could be due to later disturbances in phase 3. No dwelling structures were recognised from phase 3. Instead several sherds of soapstone were recorded, indicating the use of blubber for light or cooking. From phase 1 and 2 the tool types are well known from other Saqqaq sites in Greenland and Arctic Canada e.g. small harpoon endblades, projectile points, knife blades, scrapers, burins etc. and needles, flint flakers, harpoon heads, wedges etc. But from phase 3 previously unknown types were recorded. A new tool kit for sea mammal hunting is seen in the very sturdy harpoon or lance head made of antler. In addition there are many different kinds of barbed leisters or spears. New types of bevelled harpoon heads, bevelled knife blades and bevelled projectile points, all made of killiaq (silicified slate), were also registered. The faunal assemblage of Nipisat yielded 28,823 identified bone fragments representing at least 42 species of fish, birds and mammals. The fish remains, comprising c. 2% of the faunal material, consisted nearly entirely (98%) of fairly large sized cod (). The bird remains comprise c. 47% of the material and derive from at least 24 bird species. Gulls are the dominant group (c. 54% of the bird remains) followed by eider ducks (spp.) (24%) and spp. (13%) presumably barnacle geese (), while auks () were found in lower frequencies. The most spectacular finds, however, were skeletal remains of subadult great auks () from the oldest phase. A total of 60 presumed whooper swan () remains constitute the hitherto largest, northernmost and oldest occurrence in Greenland. At least 14 mammalian species were identified revealing a surprisingly large proportion of caribou () (51% of the mammal remains) for a coastal site. Seals accounted for 45%, with the common seal () as the absolutely dominant component. Other marine mammals were walrus () and harbour porpoise (), which played an important but minor role. Polar bear () hunting was documented by the presence of four fragments from the youngest phase. Saqqaq people were accompanied by fairly large and robust dogs (). Nipisat, the first larger Saqqaq site to be excavated from the Open Water Area was a coastal site and through all occupation phases the game animals of the surrounding waters and fjords were hunted. For more than a millennium, the site was visited briefly from time to time, at least during spring, summer and early autumn. Staging geese were captured during spring. In June and July the breeding birds were exploited for their eggs and easily accessible young, as documented by large numbers of juvenile gull bones in particular. The common seal hunting specialised on immature individuals caught primarily during their first summer on the breeding grounds. The inhabitants at Nipisat also hunted caribou on the mainland. The age structure and sex distribution of the caribou remains primarily reflect stalking. Selected body parts, especially the fore and hind legs and the heads, were transported to the island for raw material, meat filleting and further processing for marrow extraction and fat rendering. The exploitation of fauna through the entire occupation period was remarkably constant with respect to choice of game animal and the selected age groups. Although eiders were more abundant in phase 1 (36%) than in phase 3 (17%) while gulls increased from 43 to 61% in the same time period. The same trend was found valid for geese, which increased over time while the importance of auks decreased. Harbour porpoise seem to have decreased while walrus increased in relative importance through time. Caribou seem to be of greater importance in phase 3 with 55% compared to 45% in phase 1. The slight shift in preferred resources may be explained by fluctuating abundance and availability of the game species combined with the development of new hunting tools. Based on the new investigations in the Sisimiut District, the gap between Saqqaq and Dorset Culture in Central West Greenland has been diminished. Although resource exploitation at the site seems to have been very stable through all three phases, there are aspects of cultural change bridging the transition from Saqqaq to Dorset Cultures. The introduction of bevelled tools, sturdy harpoon or lance heads and the abandonment of the bow and arrow in phase 3, show cultural affiliation with Dorset technology. This is also true in terms of lithic raw material preference, the introduction of soapstone artefacts and the absence of dwelling structures with a well-defined box-hearth. At the same time it looks like, the central occupation area for the Saqqaq Culture shifted southwards from the Qeqertarsuup Tunua area towards Sisimiut and Nuuk.

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ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.94/5 ( download)

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Download or read book Jökull written by and published by . This book was released on 2006 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Jón Eiríksson
Publisher : Springer Nature
ISBN 13 : 303059663X
Total Pages : 882 pages
Book Rating : 4.37/5 ( download)

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Download or read book Pacific - Atlantic Mollusc Migration written by Jón Eiríksson and published by Springer Nature. This book was released on 2021-02-17 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume sheds new light on the marine fauna and geological setting of the Tjörnes Sequence, North Iceland, which is a classic site for the Pliocene and Pleistocene stratigraphy of the North Atlantic region. Readers will discover descriptions of new data collected by the editors over a period of over three decades on marine faunal assemblages and sedimentology available for palaeoenvironmental reconstructions, as well as the tectonic and stratigraphical relationships on Tjörnes Peninsula. The book includes a comprehensive account of all the collections of marine fossil invertebrate macrofossils and foraminifera known to the editors from the Tjörnes Sequence. It is expected to elucidate sedimentological and faunal changes from relatively stable Pliocene conditions to highly variable and periodically harsh climatic conditions of recurring Quaternary glaciations. The distribution, recent or fossil, of various species is recorded and pertinent ecological and biological features are also discussed. The Tjörnes Sequence records the Neogene migration of Pacific species into the North Atlantic. Researchers in geology, climate science, environmental science and earth science will find this book particularly valuable.

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ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.61/5 ( download)

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Download or read book Cainozoic Research written by and published by . This book was released on 2010-04 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Eugene V. Coan
Publisher : Paul Valentich-Scott
ISBN 13 : 0936494301
Total Pages : 774 pages
Book Rating : 4.02/5 ( download)

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Download or read book Bivalve Seashells of Western North America. Marine Bivalve Mollusks from Arctic Alaska to Baja California written by Eugene V. Coan and published by Paul Valentich-Scott. This book was released on 2000-05-10 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt: The culmination of a ten-year study, Bivalve Seashells of Western North America treats all bivalve mollusks living from northern Baja California, Mexico to Arctic Alaska. A total of 472 species are described and illustrated with detailed photographs and drawings. All habitats in the region are included from the intertidal splash zone to the abyssal depths of the ocean basins. The book has over 4,800 complete bibliographic references to the bivalves, including citations on the biology, physiology, ecology, and taxonomy of this commercially and biologically important group. Character tables and dichotomous keys assist the reader in identification. Also included in the 764 page book is an illustrated key to the superfamiles of the region, and a complete glossary.

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ISBN 13 :
Total Pages : 218 pages
Book Rating : 4.64/5 ( download)

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Download or read book The Nautilus written by and published by . This book was released on 2015 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : F. R. Bernard
Publisher :
ISBN 13 :
Total Pages : 114 pages
Book Rating : 4.66/5 ( download)

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Download or read book Catalogue of the Living Bivalvia of the Eastern Pacific Ocean written by F. R. Bernard and published by . This book was released on 1983 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work consists of a systematic catalogue and primary bibliography of the living Bivalvia of the eastern Pacific Ocean from Bering Strait, Alaska (66 deg N) to Cape Horn, Tierra del Fuego (60 deg S). 1308 species from the high intertidal zone to deep waters extending approximately two thousand kilometers offshore are included, representing the total described fauna. Also presented are the thermal range and fossil occurrence in the region, abstracted from the literature and collections.

Author : Sherif Ramadan Abd El-Ghany El-Refaey
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659884504
Total Pages : 360 pages
Book Rating : 4.02/5 ( download)

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Download or read book Biological Studies on Some Bivalves written by Sherif Ramadan Abd El-Ghany El-Refaey and published by LAP Lambert Academic Publishing. This book was released on 2019-02-04 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: The biomass of the molluscs is very important to ecosystems. In marine environments, molluscs may form the dominant group, especially in their larval stage, but also on soft substrates (bivalves), and on hard substrates, where some molluscs such as Pearl oysters (Pinctada) and mussels may be more important in terms of their biomass than corals (Van Bruggen, 1995). In freshwater environments biomass of molluscs is significant in some environments: for example in temperate countries lake bottoms may be covered with the small bivalves from families Sphaeriidae and Pisidiidae. In tropical areas, the same can be true. Brown (1994) summarises much of the data available on contribution of molluscs to the biomass of freshwater systems in Africa, and shows that prosobranchs contribute the major part in Lakes, such as Chad, Malawi, Tanganyika and Victoria. Molluscs in the man-made Lake Kariba made up nearly the entire biomass of the benthic animals (Prosobranchs 4.1 % and Bivalves 95.8%) (Machena and Kautsky, 1988).