The Brackish Water Clam Rangia Cuneata as Indicator of Ecological Effects of Salinity Changes in Coastal Waters

The Brackish Water Clam Rangia Cuneata as Indicator of Ecological Effects of Salinity Changes in Coastal Waters

Author: Sewell Hepburn Hopkins

Publisher:

Published: 1973

Total Pages: 270

ISBN-13:

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In the search for a laboratory test that could be used to determine when estuarine salinity changes were favorable or unfavorable, salinities in the range from 0 to 38 were tested on adult Rangia clams for effects on survival; regulation of internal salinity; intake, use and release of amino acids; respiration; glycogen use under aerobic and anaerobic conditions; feeding rate; ciliary activity; uptake of glucose; glycogen storage and 'index of condition' in natural environments through a seasonal cycle; carbohydrate-digesting enzymes; and reproduction. It was determined that Rangia cuneata has a system of compensating reactions that allows it to adjust to changes in salinity over the range from 0 to 38 ppt and over the temperature range from 10 to 35C without harm. It was concluded from these and further studies that the key to the welfare of a Rangia population is not the physiology of the adult individuals, but reproduction and recruitment. The keys to the use of Rangia cuneata as an indicator were found to be two facts: (1) a change in salinity, either up from near 0 or down from 15 ppt and above, is necessary to induce spawning; (2) the embryos and early larvae can survive only in salinities between 2 and 10 (or 15) ppt. (Modified author abstract).


Trends and Traditions in Southeastern Zooarchaeology

Trends and Traditions in Southeastern Zooarchaeology

Author: Tanya M. Peres

Publisher: University Press of Florida

Published: 2014-02-25

Total Pages: 243

ISBN-13: 0813048737

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While most works of southeastern archaeology focus on stone artifacts or ceramics, this volume is the first to bring together past and current trends in zooarchaeological studies. Faunal reports are often relegated to appendices and not synthesized with the rest of the archaeological data, but Trends and Traditions in Southeastern Zooarchaeology calls attention to the diversity of information that faunal remains can reveal about rituals, ideologies, socio-economic organization, trade, and past environments. These essays, by leading practitioners in this developing field, highlight the differences between the archaeological focus on animals as the food source of their time and the belief among zooarchaeologists that animals represent a far more complex ecology. With broad methodological and interpretive analysis of sites throughout the region, the essays range in topic from the enduring symbolism of shells for more than 5,000 years to the domesticated dog cemeteries of Spirit Hill in Jackson County, Alabama, and to the subsistence strategies of Confederate soldiers at the Florence Stockade in South Carolina. Ultimately challenging traditional concepts of the roles animals have played in the social and economic development of southeastern cultures, this book is a groundbreaking and seminal archaeological study.


Monthly Catalog, United States Public Documents

Monthly Catalog, United States Public Documents

Author: United States. Superintendent of Documents

Publisher:

Published: 1973

Total Pages: 1252

ISBN-13:

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February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index.