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Sneaking up on "enemies"; alleviating inherent disadvantages in competitive outcomes in a nearly 3-million-year-old palaeocommunity from Florida, USA

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doi: 10.1111/let.12376
Authors:Di Martino, Emanuela; Liow, Lee Hsiang; Perkins, Tom; Portell, Roger W.; Taylor, Paul D.
Author Affiliations:Primary:
University of Oslo, Natural History Museum, Oslo, Norway
Other:
Natural History Museum, United Kingdom
University of Florida, United States
Volume Title:Lethaia
Source:Lethaia, 53(4), p.553-562. Publisher: Wiley for the Lethaia Foundation, Oslo, Norway. ISSN: 0024-1164
Publication Date:2020
Note:In English. Includes appendix. 20 refs.; illus., incl. 6 tables, sketch map
Summary:Bryozoans offer one of the few systems in which competitive interactions for living space can be studied in the fossil record. Here, we describe the outcome of competitive overgrowths in a 3-million-year-old bryozoan palaeocommunity encrusting shells of the bivalve Anomia simplex from the lower Tamiami Formation in Florida (upper Pliocene, Piacenzian). We found that win-lose overgrowths are more common than stand-offs in interspecific encounters, while stand-offs are more common than win-lose overgrowths in intraspecific encounters. We observed more intraspecific encounters and fewer interspecific interactions than expected under a null hypothesis, suggesting that bryozoans of the same species are likely to be clustered. For some species, intraspecific encounters are more likely to result in the apparent fusion of the two colonies, with the development of rows of kenozooids along the contact edge, probably reflecting relatively low dispersal. We also identified some clear winners and some clear losers. A negative correlation was found between the number of colonies observed and the probability of winning for a species, resulting in a dominance of loser species in the assemblage, a pattern previously described as typical for early colonizers of hard substrates. Our results also confirm the finding of earlier studies that having large zooids and, subordinately, multilayered growth are key traits for success in overgrowth competition, with angle of encounter also having an effect for both poor and good competitors that take advantage of 'attacking' colonies of other species from the rear and the flank. Abstract Copyright (2020), John Wiley & Sons, Ltd.
Subjects:Bivalvia; Bryozoa; Cenozoic; Colonial taxa; Communities; Electron microscopy data; Encrustations; Epibiotism; Faunal list; Faunal studies; Mollusca; Morphology; Neogene; Paleoecology; Piacenzian; Pliocene; SEM data; Shells; Tamiami Formation; Tertiary; Upper Cenozoic; Upper Pliocene; Florida; Sarasota County Florida; United States; Anomia simplex; Sarasota Florida
Coordinates:N272200 N272200 W0822200 W0822200
Record ID:889754-10
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom
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