1731. Rare Middle Triassic coleoids from the Alpine-Carpathian system: new records from Slovakia and their signifcanceMartin Košťák, Ján Schlögl, Dirk Fuchs, Milan Havrila, Tea Kolar-Jurkovšek, Attila Vörös, Martina Havelcová, Juraj Šurka, Jakub Havrila, Katarína Holcová, 2024, original scientific article Abstract: Two stratigraphically well constrained (by ammonites and conodonts) coleoid remains have been recorded from the Triassic (Anisian) dark-grey organodetritic limestones (Ráztoka Limestone) of Western Carpathians (Hronic Nappe). The limestones deposited at the periphery of a former carbonate platform. It yields a highly diverse cephalopod fauna including nautiloids (2 taxa), ammonoids (7 taxa) and indetermined aulacoceratids. Two unusual coleoid specimens are referred to genus Mojsisovicsteuthis (M. boeckhi) and probably to a new taxon (described as Breviconoteuthis aff. breviconus herein) possessing similar morphological features of genus Breviconoteuthis (Phragmoteuthida) and/or Zugmontites. Based on index ammonites and conodonts, both records are of the uppermost Trinodosus through the lowermost Reitzi zones (Anisian—lower Illyrian). While the genus Mojsisovicsteuthis has been widely dispersed (however its records are rare), the occurrence of Breviconoteuthis and Zugmontites is strictly limited to the Alpine-Carpathian region. Comparing with the holotype and additional specimens stored in the Hungarian Natural History Museum, the overal shell of Mojsisovicsteuthis and its size has been reconstructed. Its relationship to aulacoceratids and phragmoteuthids is briefly discussed. Geochemical record (n-alkanes from the bulk rock) provided a relevant signal of the existence of algal meadows.
Keywords: Cephalopods, Conodonts, Anisian, Palaeoenvironment
Published in DiRROS: 21.05.2024; Views: 415; Downloads: 337
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1736. Tuning the long-term corrosion behaviour of biodegradable WE43 magnesium alloy by PEO coatingJulia Nachtsheim, Songyun Ma, Jaka Burja, Barbara Šetina, Bernd Markert, 2023, original scientific article Keywords: long-term degradation, in vitro corrosion mechanisms: biodegradable, magnesium, DMEM fluid, hydrogen evolution, PEO coating
Published in DiRROS: 20.05.2024; Views: 424; Downloads: 195
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1737. Effect of microalloying on tempering of Mo-W high thermal conductivity steelJaka Burja, Aleš Nagode, Jože Medved, Tilen Balaško, Klemen Grabnar, 2023, original scientific article Keywords: hot work tool steel, microalloying, močybdenum, tungsten, tempering, heat treatment
Published in DiRROS: 20.05.2024; Views: 417; Downloads: 193
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1740. Too hot to handle : effects of water temperature on the early life stages of Gongolaria barbata (Fucales)Ana Lokovšek, Valentina Pitacco, Annalisa Falace, Domen Trkov, Martina Orlando-Bonaca, 2024, original scientific article Abstract: Gongolaria barbata plays a crucial role as a habitat-forming Fucales species in the Mediterranean Sea, thriving in shallow, sheltered coastal regions, where it exhibits optimal growth in a temperature range of 10 to 25 °C. In the northern Adriatic Sea, a semi-enclosed part of the Mediterranean, there has been a remarkable increase in seawater temperatures in recent decades, often exceeding 28 °C in summer. These high temperatures pose a significant threat to the vulnerable early life stages of G. barbata. This study delves into the effects of four temperatures (15, 18, 24, and 28 °C) on the growth of G. barbata over its first 16 days, closely monitoring mortality, deformities, and overall survival. Our experiments reveal that higher temperatures can result in deformities and increased mortality of germlings. Notably, a temperature of 28 °C resulted in the death of all germlings within the first week, whereas those exposed to 24 °C survived until the second week, albeit with significant deformities prior to death. In contrast, germlings cultivated at 15 and 18 °C exhibited normal development with minimal deformities. These results highlight the susceptibility of the early life stages of G. barbata to temperature-induced stress and provide valuable insights into the potential consequences of rising seawater temperatures in the Mediterranean.
Keywords: sea temperature, early stages of growth, deformations, macroalgae, climate change, Mediterranean Sea
Published in DiRROS: 17.05.2024; Views: 493; Downloads: 451
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