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  • 1.
    Zaton, Michal
    et al.
    Univ Silesia, Fac Earth Sci, Bedzinska 60, PL-41200 Sosnowiec, Poland.;KNOW Leading Natl Res Ctr, Ctr Polar Studies, Sosnowiec, Poland..
    Niedzwiedzki, Grzegorz
    Uppsala universitet, Evolution och utvecklingsbiologi.
    Blom, Henning
    Uppsala universitet, Evolution och utvecklingsbiologi.
    Kear, Benjamin P.
    Uppsala universitet, Evolutionsmuseet.
    Boreal earliest Triassic biotas elucidate globally depauperate hard substrate communities after the end-Permian mass extinction2016Inngår i: Scientific Reports, E-ISSN 2045-2322, Vol. 6, artikkel-id 36345Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The end-Permian mass extinction constituted the most devastating biotic crisis of the Phanerozoic. Its aftermath was characterized by harsh marine conditions incorporating volcanically induced oceanic warming, widespread anoxia and acidification. Bio-productivity accordingly experienced marked fluctuations. In particular, low palaeolatitude hard substrate communities from shallow seas fringing Western Pangaea and the Tethyan Realm were extremely impoverished, being dominated by monogeneric colonies of filter-feeding microconchid tubeworms. Here we present the first equivalent field data for Boreal hard substrate assemblages from the earliest Triassic (Induan) of East Greenland. This region bordered a discrete bio-realm situated at mid-high palaeolatitude (> 30 degrees N). Nevertheless, hard substrate biotas were compositionally identical to those from elsewhere, with microconchids encrusting Claraia bivalves and algal buildups on the sea floor. Biostratigraphical correlation further shows that Boreal microconchids underwent progressive tube modification and unique taxic diversification concordant with changing habitats over time. We interpret this as a post-extinction recovery and adaptive radiation sequence that mirrored coeval subequatorial faunas, and thus confirms hard substrate ecosystem depletion as a hallmark of the earliest Triassic interval globally.

    Fulltekst (pdf)
    FULLTEXT01
  • 2.
    Zaton, Michal
    et al.
    Univ Silesia Katowice, Fac Earth Sci, Bedzinska 60, PL-41200 Sosnowiec, Poland.
    Niedzwiedzki, Grzegorz
    Uppsala universitet, Institutionen för organismbiologi.
    Rakocinski, Michal
    Univ Silesia Katowice, Fac Earth Sci, Bedzinska 60, PL-41200 Sosnowiec, Poland.
    Blom, Henning
    Uppsala universitet, Institutionen för organismbiologi.
    Kear, Benjamin P.
    Uppsala universitet, Evolutionsmuseet.
    Earliest Triassic metazoan bioconstructions from East Greenland reveal a pioneering benthic community in the immediate aftermath of the end-Permian mass extinction2018Inngår i: Global and Planetary Change, ISSN 0921-8181, E-ISSN 1872-6364, Vol. 167, s. 87-98Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Marine benthic ecosystems collapsed during the catastrophic end-Permian mass extinction, and subsequently endured a protracted phase of biotic recovery under harsh environmental conditions. In particular, metazoan reef communities almost totally disappeared and were replaced by microbe-dominated mounds during the latest Permian-earliest Triassic. Here we report the stratigraphically oldest exclusively metazoan bioconstructions from earliest Triassic (mid-Induan) strata in East Greenland - these formed within the first ca 300 ka after the Permian-Triassic boundary. Unlike the multitaxic sponge-microbe and bivalve-based buildups recorded from the Early Triassic peri-paleoequatorial Panthalassan and Tethyan margins, the East Greenland bioaccumulations developed within a restricted Boreal mid-paleolatitude seaway, and comprised a monospecific primary framework of microconchid 'lophophorate tubes with shell fragments and phosphatic debris cemented by biogenic calcite. Prostrate growth of the microconchids likely facilitated their accretion into successive sheet-like biostromes and small bioherms. These are associated with a regional paleoenvironmental shift towards well-oxygenated bottom waters, and locally punctuated sedimentation that created a favorable habitat. Although microconchids were both abundant and geographically widespread throughout the earliest Triassic, such buildups formed solely by these metazoans have not been reported from that time frame outside the Boreal Realm. These apparently flourished in the absence of more stable complex communities, and suggest that a locally variable, rather than ubiquitously sequential revival of metazoan bioconstruction activity took place in the immediate aftermath of the end-Permian extinction. However, these may also suggest that ecological recovery of benthic marine ecosystems following the end-Permian mass extinction might have started earlier in higher paleolatitudes.

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