Inference of ecology from the ontogeny of microfossils
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 1989 This work comprises three detailed studies of ontogeny and ecology. In the first chapter, four living specie...
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Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
1989
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/5395 2023-05-15T17:14:59+02:00 Inference of ecology from the ontogeny of microfossils Schweitzer, Peter N. Sippewissett Marsh, Buzzards Bay, MA Ceara Rise Sierra Leone Rise Bermuda Rise 1989-06 application/pdf https://hdl.handle.net/1912/5395 en_US eng Massachusetts Institute of Technology and Woods Hole Oceanographic Institution WHOI Theses https://hdl.handle.net/1912/5395 doi:10.1575/1912/5395 doi:10.1575/1912/5395 Ecology Paleontology Ontogeny Thesis 1989 ftwhoas https://doi.org/10.1575/1912/5395 2022-05-28T22:58:38Z Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 1989 This work comprises three detailed studies of ontogeny and ecology. In the first chapter, four living species of the ostracode genus Cyprideis were studied both morphologically and ecologically to determine whether differences in age at maturity are correlated with heterochrony as expected; accelerated maturity should yield generalized morphology and small size, while delayed maturity should produce specialized morphology and large size. Two of the four species show the expected pattern, the other two do not. Cyprideis does not support the generalization that life-history evolution causes heterochrony, and casts doubt on the inference of life-history evolution from heterochrony where the data are drawn exclusively from extinct forms. In the second chapter, populations of Globorotalia menardii and G. tumida were subjected to careful morphological analysis; the stable-isotopic composition of the growth stages revealed that both species inhabit the upper fifty meters of the ocean, descending to deeper water (75-l00m) for the emplacement of an enveloping calcite crust. The third chapter shows a simple relationship between proloculus size and rate of chamber expansion in the polar planktonic foraminifer Neogloboquadrina pachyderma. The consequences for morphology of variations in ontogeny can be used to suggest ways of selecting specimens that minimize ontogenetic variations in shell chemistry. Thesis Neogloboquadrina pachyderma Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Woods Hole, MA |
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Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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ftwhoas |
language |
English |
topic |
Ecology Paleontology Ontogeny |
spellingShingle |
Ecology Paleontology Ontogeny Schweitzer, Peter N. Inference of ecology from the ontogeny of microfossils |
topic_facet |
Ecology Paleontology Ontogeny |
description |
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 1989 This work comprises three detailed studies of ontogeny and ecology. In the first chapter, four living species of the ostracode genus Cyprideis were studied both morphologically and ecologically to determine whether differences in age at maturity are correlated with heterochrony as expected; accelerated maturity should yield generalized morphology and small size, while delayed maturity should produce specialized morphology and large size. Two of the four species show the expected pattern, the other two do not. Cyprideis does not support the generalization that life-history evolution causes heterochrony, and casts doubt on the inference of life-history evolution from heterochrony where the data are drawn exclusively from extinct forms. In the second chapter, populations of Globorotalia menardii and G. tumida were subjected to careful morphological analysis; the stable-isotopic composition of the growth stages revealed that both species inhabit the upper fifty meters of the ocean, descending to deeper water (75-l00m) for the emplacement of an enveloping calcite crust. The third chapter shows a simple relationship between proloculus size and rate of chamber expansion in the polar planktonic foraminifer Neogloboquadrina pachyderma. The consequences for morphology of variations in ontogeny can be used to suggest ways of selecting specimens that minimize ontogenetic variations in shell chemistry. |
format |
Thesis |
author |
Schweitzer, Peter N. |
author_facet |
Schweitzer, Peter N. |
author_sort |
Schweitzer, Peter N. |
title |
Inference of ecology from the ontogeny of microfossils |
title_short |
Inference of ecology from the ontogeny of microfossils |
title_full |
Inference of ecology from the ontogeny of microfossils |
title_fullStr |
Inference of ecology from the ontogeny of microfossils |
title_full_unstemmed |
Inference of ecology from the ontogeny of microfossils |
title_sort |
inference of ecology from the ontogeny of microfossils |
publisher |
Massachusetts Institute of Technology and Woods Hole Oceanographic Institution |
publishDate |
1989 |
url |
https://hdl.handle.net/1912/5395 |
op_coverage |
Sippewissett Marsh, Buzzards Bay, MA Ceara Rise Sierra Leone Rise Bermuda Rise |
genre |
Neogloboquadrina pachyderma |
genre_facet |
Neogloboquadrina pachyderma |
op_source |
doi:10.1575/1912/5395 |
op_relation |
WHOI Theses https://hdl.handle.net/1912/5395 doi:10.1575/1912/5395 |
op_doi |
https://doi.org/10.1575/1912/5395 |
op_publisher_place |
Woods Hole, MA |
_version_ |
1766073097895542784 |