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Author: William A. Newman
Publisher: American Geophysical Union
ISBN: 087590114X
Category : Cirripedia
Languages : en
Pages : 315
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Book Description
Author: William A. Newman
Publisher: American Geophysical Union
ISBN: 087590114X
Category : Cirripedia
Languages : en
Pages : 315
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Book Description
Author: Rodney M. Feldmann
Publisher: Geological Society of America
ISBN: 081371169X
Category : Science
Languages : en
Pages : 578
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Book Description
Author:
Publisher:
ISBN:
Category : Antarctica
Languages : en
Pages : 384
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Book Description
Author: Merrill W. Foster
Publisher: American Geophysical Union
ISBN: 0875901220
Category : Science
Languages : en
Pages : 192
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Book Description
Published by the American Geophysical Union as part of the Antarctic Research Series, Volume 21. The Recent brachiopod faunas from southernmost South America, Antarctica, and the Subantarctic consisting of 21 genera and 37 species are described from new material. New taxa include the genera Manithyris and Bathynanus. Also new are 11 species: Compsothyris ballenyi, Hispanirhynchia? chiliensis, Manithyris rossi, Liothyrella multiporosa, Liothyrella scotti, Bathynanus tenuicostatus, Eucalathis macrorhynchus, Amphithyris hallettensis, Dallina eltanini, Fallax antarcticus, and Magellania? spinosa. Factor analysis was used to study relationships among morphological characters and environmental parameters. In Liothyrella, negative associations were found between beak height and water depth. The size of the pedicle opening within this genus is associated with the width of the hinge plate and the loop; apparently, these associations are related to increased dorsal adjustor muscle size with increased pedicle size. Similar relationships are found in the terebratellids, although here all of the characters are also negatively associated with water depth. Characters negatively associated with water depth may relate to the differing current strength at various depths. Puncta density is positively correlated with water temperature. Examples of brachiopod variation are discussed. Synonyms have resulted from former failure to study large samples and to appreciate the extent of brachiopod variation. A priori valuation of certain characters as being specific is unwarranted, since sibling species may be more similar than different subspecies of the same species. Many Recent and fossil brachiopod genera are too narrow in definition owing to oversplitting or to a narrow conception of monophyly. I advocate somewhat broader and more practical genera for obtaining the maximal information value from such taxa. Brachiopods, contrary to popular belief, are an abundant and viable group in the southern hemisphere faunas. Most brachiopods in the Ross Sea appear to have definite niches and habitats but may overlap geographically where population densities are low. Brachiopods here can be divided roughly into a slope and a shelf assemblage. The greatest species diversity occurs at the seaward edge of the Ross Sea shelf, interpreted as an ecotone effect where two different water types meet. Only South America and Antarctica appear to have or have had direct communication between some elements of their brachiopod faunas. Other similarities between separate southern continents are related to retention of common pre-Cenozoic elements or to chance dispersal of larvae across barriers. Events related to cooling during the late Pliocene or Pleistocene caused reduction of puncta density, shell thickness, and spiculation in the Recent fauna and apparently influenced the present species structure, at least in Liothyrella uva, Gyrothyris mawsoni, and Macandrevia.
Author: George A. Llano
Publisher: American Geophysical Union
ISBN:
Category : Marine biology
Languages : en
Pages : 369
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Author: George A. Llano
Publisher: American Geophysical Union
ISBN: 0875901174
Category : Science
Languages : en
Pages : 369
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Book Description
Published by the American Geophysical Union as part of the Antarctic Research Series, Volume 17. Of the volumes currently available in the Antarctic Research Series, this volume is the fourth dealing with the biology of the antarctic seas. These collected papers comprise the results of original investigations, 11 of which are concerned mainly with the identification and distribution of marine plants and animals. In the first of these papers Stewart Springer gives a systematic appraisal of the five species of elasmobranch Rajidae from Antarctica, of which one represents a new and unique species. Heretofore one of the peculiarities of the antarctic ichthyological fauna has been the absence of sharks. In this very significant contribution, the author establishes the most southerly record for any member of the elasmobranchs. The second paper, by Patricia Kott, amplifies our systematic knowledge of the tunicates of the South Atlantic, South Pacific, and Indian oceans. It extends her monograph published as volume 13 of the Research Series under the title of Antarctic Ascidiacea and is based on collections made in the Antarctic through 1967; two new species are included. Additions and corrections to volume 13 are appended to this paper. John C. Markham reports on several lower chordates of the genus Cephalodiscus and discusses the systematics and distribution of the five species known from the Antarctic. The Deep Freeze materials examined in the course of this study were obtained through the U.S. Navy Hydrographic Office oceanographers from icebreakers assigned to task force 43 prior to and after the 1955–1959 International Geophysical Year and precede the National Science Foundation sponsored research now being conducted by the USNS Eltanin and the R/V Hero under the U.S. Antarctic Research Program.
Author: Bozzano G Luisa
Publisher: Academic Press
ISBN: 0323139256
Category : Business & Economics
Languages : en
Pages : 343
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Book Description
The Biology of Crustacea
Author: D.T. Anderson
Publisher: Springer Science & Business Media
ISBN: 9780412444203
Category : Science
Languages : en
Pages : 382
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Book Description
A great deal is now known about the functional organization, physiology, reproduction, and development of barnacles. For the first time, this book brings to bear all aspects of this knowledge on our interpretation of the dynamics of barnacle evolution relating them to the fossil history and biogeography of the group.
Author: Robert H. Gore
Publisher: Routledge
ISBN: 1351456881
Category : Science
Languages : en
Pages : 318
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Book Description
This work covers the geographical distribution of Crustaceans with hypotheses on how the distribution took place, based on fossil and recent records.
Author: Alan J. Southward
Publisher: Routledge
ISBN: 1351464744
Category : Science
Languages : en
Pages : 498
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Book Description
This text gives an overview of almost all aspects of barnacle biology covering advances made since Charles Darwin to the present day.
