| | | Document Type | : | Latin Dissertation | | Language of Document | : | English | | Record Number | : | 53359 | | Doc. No | : | TL23313 | | Call number | : | 3303238 | | Main Entry | : | Michael G. Newbrey | | Title & Author | : | Climate change and evolution of growth in North American Hiodontidae, Esocidae, and PercidaeMichael G. Newbrey | | College | : | North Dakota State University | | Date | : | 2007 | | Degree | : | Ph.D. | | student score | : | 2007 | | Page No | : | 257 | | Abstract | : | Relationships between temperature and von Bertalanffy growth characteristics (i.e., total length prior to sexual maturity, maximum total length, growth rate, and longevity) are examined for extinct and extant taxa of North American Hiodontidae, Esocidae, and Percidae. Multiple relationships are reported with significant differences in size, growth rate, and life span of fossil hiodontids and esocoids. Total length prior to sexual maturity was significantly and positively correlated with mean annual temperature (MAT) for all taxa examined. There were negatively correlated relationships between maximum total length (MTL) and MAT for three of the taxa. Growth rate was mostly correlated with MAT in extant hiodontids and esocids. For the extant percids, 66% of the relationships between growth rate and MAT were significant and positively correlated. Life span was significantly greater in colder climates for extant and extinct Hiodontidae and Esocidae, but only half of the relationships examined for the percids were significant. In general, the Percidae had fewer relationships between growth characteristics and temperature. The relationships between most of the growth characteristics and temperature for Esox niger are correlated in an opposite polarity compared to those of the other esocid species examined. Cretaceous hiodontids and esocoids were significantly smaller than those of the Cenozoic, but for the esocoids size changed around two major climatic events, the Cretaceous-Cenozoic and Pliocene-Pleistocene boundaries. Growth rates in Cenozoic esocids were significantly slower than extant taxa following the Pliocene-Pleistocene boundary. Growth rates for Eocene hiodontids were significantly slower compared to those of extant Hiodon. Prior to the Pliocene-Pleistocene boundary, only esocids showed significantly longer life spans at similar temperatures. The latitudinal distribution of Cenozoic hiodontids, esocids, and percids is correlated with temperature with the exception for the esocoids at the EETM when a new subgenus appeared. Unlike Miocene and Pliocene Eurasian percids, esocids and hiodontids dispersed northward during warm episodes and southward during cool episodes. Given the many significant relationships between temperature and growth characteristics, it is plausible that times of major climate change were especially significant in the evolution of the Hiodontidae and Esocidae. | | Subject | : | Earth sciences; Climate change; Esocidae; Hiodontidae; Percidae; Paleontology; 0418:Paleontology | | Added Entry | : | A. C. Ashworth | | Added Entry | : | North Dakota State University |
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