Download or read book Recent Antarctic and Subantarctic Brachiopods written by Merrill W. Foster and published by American Geophysical Union. This book was released on 1974 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book The West Antarctic Ice Sheet written by and published by American Geophysical Union. This book was released on 1998 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Brachiopods written by Howard Brunton and published by CRC Press. This book was released on 2001-11-29 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growth history of a brachiopod is entombed in its shell, but research on fossil and living brachiopods has generated unanswered questions about these marine invertebrates. Several contributors to Brachiopods Past and Present comment on their differing structures and morphological detail. They use these as examples of ontogenetic and evolutionar
Download or read book Oceanography and Marine Biology written by R. N. Gibson and published by CRC Press. This book was released on 2003-07-31 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in oceanography and marine biology and its relevance to global environmental issues continues to increase, creating a demand for authoritative reviews that summarize recent research. Oceanography and Marine Biology: An Annual Review has catered to this demand since its foundation, by the late Harold Barnes, more than 40 years ago. It is an
Download or read book Fossil Scleractinian Corals from James Ross Basin Antarctica written by Filkorn and published by American Geophysical Union. This book was released on 1994 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conservation Paleobiology written by Gregory P. Dietl and published by University of Chicago Press. This book was released on 2017-11-17 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: In conservation, perhaps no better example exists of the past informing the present than the return of the California condor to the Vermilion Cliffs of Arizona. Extinct in the region for nearly one hundred years, condors were successfully reintroduced starting in the 1990s in an effort informed by the fossil record—condor skeletal remains had been found in the area’s late-Pleistocene cave deposits. The potential benefits of applying such data to conservation initiatives are unquestionably great, yet integrating the relevant disciplines has proven challenging. Conservation Paleobiology gathers a remarkable array of scientists—from Jeremy B. C. Jackson to Geerat J. Vermeij—to provide an authoritative overview of how paleobiology can inform both the management of threatened species and larger conservation decisions. Studying endangered species is difficult. They are by definition rare, some exist only in captivity, and for those still in their native habitats any experimentation can potentially have a negative effect on survival. Moreover, a lack of long-term data makes it challenging to anticipate biotic responses to environmental conditions that are outside of our immediate experience. But in the fossil and prefossil records—from natural accumulations such as reefs, shell beds, and caves to human-made deposits like kitchen middens and archaeological sites—enlightening parallels to the Anthropocene can be found that might serve as a primer for present-day predicaments. Offering both deep-time and near-time perspectives and exploring a range of ecological and evolutionary dynamics and taxa from terrestrial as well as aquatic habitats, Conservation Paleobiology is a sterling demonstration of how the past can be used to manage for the future, giving new hope for the creation and implementation of successful conservation programs.
Download or read book Journal of the Royal Society of New Zealand written by and published by . This book was released on with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Theses in Geology 1967 1970 written by Dederick C. Ward and published by Geological Society of America. This book was released on 1973 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Marine Biology written by and published by Academic Press. This book was released on 1992-07-29 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Marine Biology
Download or read book New Zealand Journal of Zoology written by and published by . This book was released on 1981 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atmospheric Halos written by Tape and published by American Geophysical Union. This book was released on 1994 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Brachiopods written by Paul Copper and published by Routledge. This book was released on 2018-02-02 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of conference papers presents information on the molecular genetics, biomineralization, growth and ecology of extant brachiopod stocks (extrapolated back to the Cambrian), and the shell microstructure, taphonomy, paleogeography, evolution, and taxonomy of fossil brachiopods.
Download or read book New Zealand Journal of Zoology written by and published by . This book was released on 1981 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology and Paleontology of Seymour Island Antarctic Peninsula written by Rodney M. Feldmann and published by Geological Society of America. This book was released on 1988 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the Royal Society of New Zealand written by and published by . This book was released on with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the Royal Society of New Zealand written by and published by . This book was released on 1987-03 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the Royal Society of New Zealand written by and published by . This book was released on 1989-09 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
