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Population structure of graptolite assemblages

Underwood, Charlie J. (1998) Population structure of graptolite assemblages. Lethaia 31 , pp. 33-41.


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Graptolite rhabdosomes display a diverse suite of morphologies. The range of morphotypes present within most moderate to high diversity assemblages from the Ordovician and Silurian is similar, despite the different taxonomic composition of the faunas at different times. Survivorship analyses of graptolite faunas from the Ordovician and Silurian demonstrate strong similarities in the mortality rates of unrelated graptolites of similar functional morphology. It also shows a strong correlation of decreasing mortality rates amongst more mature colonies with increasing rhabdosome complexity. This similarity in both functional morphology and life history of graptolites suggests that they lived within a very stable planktic community structure.

Item Type: Article
Keyword(s) / Subject(s): Graptolites, ontogeny, palaeoecology, populations, survivorship.
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Earth and Planetary Sciences
Depositing User: Charles Underwood
Date Deposited: 30 Mar 2005
Last Modified: 17 Apr 2013 12:32

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