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- W315260718 abstract "Delocrinus subhemisphericus (Ds) is among the most ecologically wide-ranging and abundant Late Pennsylvanian crinoid species in the midcontinent. Multivariate analyses and coenocline reconstructions indicate that Ds was typically the dominant component of low-diversity, moderate depth assemblages. Morphometric analyses of populations of Ds from different systems-tracts of Upper Missourian sequences show that offshore individuals are small and that size increases to a maximum in nearshore facies. These differences can be attributed to developmental flexibility, accomplished by either rapid maturation in offshore populations for equal rates of size increase (growth rate) or slower growth in offshore populations for equal intervals of development (maturation rate). The offshore phenotype of this species is not adaptive in that it does not impart a unique functional advantage over the nearshore phenotype; small size offshore appears to be the outcome of slowed growth in a stressed environment having reduced current flow where larger body sizes could not be maintained. Although the small adult phenotype is not the optimally adapted offshore morphology compared to the dominant open fan crinoids, developmental and life-history flexibility can be considered adaptive for the species as a whole. This flexibility allowed it to occupy a wider range of environments than would have beenmore » habitable had size at maturity been constrained. This pattern reflects either transgressive-regressive tracking by ecophenotype populations or modification of successive generations of established populations with changing sea-level.« less" @default.
- W315260718 created "2016-06-24" @default.
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- W315260718 date "1992-01-01" @default.
- W315260718 modified "2023-09-24" @default.
- W315260718 title "Heterochronic ecophenotypes and distribution patterns of Delocrinus subhemisphericus in Upper Missourian cyclic sequences, midcontinent, North America: A species response to changing sea-level" @default.
- W315260718 hasPublicationYear "1992" @default.
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