Competition in slow motion: the unusual case of benthic marine communities in the wake of the end-Permian mass extinction

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Hautmann, MichaelUniv Zurich, Palaontol Inst & Museum, CH-8006 Zurich, Switzerland. (author)

Competition in slow motion : the unusual case of benthic marine communities in the wake of the end-Permian mass extinction

Article/chapterEnglish2015

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2015-07-28
Wiley,2015
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LIBRIS-ID:oai:DiVA.org:uu-263450
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-263450URI
https://doi.org/10.1111/pala.12186DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

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Changes of community structure in response to competition usually take place on timescales that are much too short to be visible in the geological record. Here we report the notable exception of a benthic marine community in the wake of the end-Permian mass extinction, which is associated with the microbial limestone facies of the earliest Triassic of South China. The newly reported fauna is well preserved and extraordinarily rich (30 benthic macroinvertebrate species, including the new species Astartella? stefaniae (Bivalvia) and Eucochlis obliquecostata (Gastropoda)) and stems from an environmentally stable setting providing favourable conditions for benthic organisms. Whereas changes in the taxonomic composition are negligible over the observed time interval of 10-100ka, three ecological stages are identified, in which relative abundances of initially rare species continuously increased at the cost of previously dominant species. Concomitant with the changes of dominant species is an increase in faunal evenness and heterogeneity. In the absence of both environmental and taxonomic changes, we attribute this pattern to the long-term effects of interspecific competition, which acted at an unusually slow pace because the number of competing species and potential immigrants was dramatically reduced by the end-Permian mass extinction. We suggest that these non-actualistic conditions led to decreased rates of niche differentiation and hence to the delayed rediversification of benthos that characterizes the aftermath of the greatest Phanerozoic mass extinction event. A hyperbolic diversification model is proposed, which accounts for the positive relationship between the intensity of interspecific competition and the rate of niche differentiation and resolves the conundrum of delayed rediversification at a time when niche space was largely vacated.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Geologi hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Geology hsv//eng
NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng
diversification
competition
benthos
Early Triassic
China

Added entries (persons, corporate bodies, meetings, titles ...)

Bagherpour, BorhanUniv Zurich, Palaontol Inst & Museum, CH-8006 Zurich, Switzerland. (author)
Brosse, MorganeUniv Zurich, Palaontol Inst & Museum, CH-8006 Zurich, Switzerland. (author)
Frisk, ÅsaUppsala universitet,Paleobiologi,Univ Zurich, Palaontol Inst & Museum, CH-8006 Zurich, Switzerland.(Swepub:uu)asfri516 (author)
Hofmann, RichardUniv Zurich, Palaontol Inst & Museum, CH-8006 Zurich, Switzerland. (author)
Baud, AymonBaud Geol Consultant, CH-1018 Lausanne, Switzerland. (author)
Nuetzel, AlexanderGeoBioctr LMU, Dept Earth & Environm Sci Paleontol & Geobiol, SNSB Bayer Staatssammlung Palaontol & Geol, D-80333 Munich, Germany. (author)
Goudemand, NicolasUniv Zurich, Palaontol Inst & Museum, CH-8006 Zurich, Switzerland. (author)
Bucher, HugoUniv Zurich, Palaontol Inst & Museum, CH-8006 Zurich, Switzerland. (author)
Univ Zurich, Palaontol Inst & Museum, CH-8006 Zurich, Switzerland.Paleobiologi (creator_code:org_t)

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In:Palaeontology: Wiley58:5, s. 871-9010031-02391475-4983

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geology

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Ecology

Articles in the publication: Palaeontology

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