mgr Niklas Hohmann

@article{Agiadi2024c,

title = {A revised marine fossil record of the Mediterranean before and after the Messinian salinity crisis},

author = {Konstantina Agiadi and Niklas Hohmann and Elsa Gliozzi and Danae Thivaiou and Francesca R. Bosellini and Marco Taviani and Giovanni Bianucci and Alberto Collareta and Laurent Londeix and Costanza Faranda and Francesca Bulian and Efterpi Koskeridou and Francesca Lozar and Alan Maria Mancini and Stefano Dominici and Pierre Moissette and Ildefonso Bajo Campos and Enrico Borghi and George Iliopoulos and Assimina Antonarakou and George Kontakiotis and Evangelia Besiou and Stergios D. Zarkogiannis and Mathias Harzhauser and Francisco Javier Sierro and Angelo Camerlenghi and Daniel García-Castellanos},

doi = {10.5194/essd-16-4767-2024},

issn = {1866-3516},

year  = {2024},

date = {2024-10-22},

urldate = {2024-10-22},

journal = {Earth System Science Data},

volume = {16},

number = {10},

pages = {4767--4775},

publisher = {Copernicus GmbH},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Agiadi2024b,

title = {Late Miocene transformation of Mediterranean Sea biodiversity},

author = {Konstantina Agiadi and Niklas Hohmann and Elsa Gliozzi and Danae Thivaiou and Francesca R. Bosellini and Marco Taviani and Giovanni Bianucci and Alberto Collareta and Laurent Londeix and Costanza Faranda and Francesca Bulian and Efterpi Koskeridou and Francesca Lozar and Alan Maria Mancini and Stefano Dominici and Pierre Moissette and Ildefonso Bajo Campos and Enrico Borghi and George Iliopoulos and Assimina Antonarakou and George Kontakiotis and Evangelia Besiou and Stergios D. Zarkogiannis and Mathias Harzhauser and Francisco Javier Sierro and Marta Coll and Iuliana Vasiliev and Angelo Camerlenghi and Daniel García-Castellanos},

doi = {10.1126/sciadv.adp1134},

issn = {2375-2548},

year  = {2024},

date = {2024-09-25},

urldate = {2024-09-25},

journal = {Science Advances},

volume = {10},

number = {39},

pages = {eadp1134},

publisher = {American Association for the Advancement of Science (AAAS)},

abstract = {<jats:p>Understanding deep-time marine biodiversity change under the combined effects of climate and connectivity changes is fundamental for predicting the impacts of modern climate change in semi-enclosed seas. We quantify the Late Miocene–Early Pliocene [11.63 to 3.6 million years (Ma)] taxonomic diversity of the Mediterranean Sea for calcareous nannoplankton, dinocysts, foraminifera, ostracods, corals, molluscs, bryozoans, echinoids, fishes, and marine mammals. During this time, marine biota was affected by global climate cooling and the restriction of the Mediterranean’s connection to the Atlantic Ocean that peaked with the Messinian salinity crisis. Although the net change in species richness from the Tortonian to the Zanclean varies by group, species turnover is greater than 30% in all cases, reflecting a high degree of reorganization of the marine ecosystem after the crisis. The results show a clear perturbation already in the pre-evaporitic Messinian (7.25 to 5.97 Ma), with patterns differing among groups and subbasins.</jats:p>},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Agiadi2024,

title = {The marine biodiversity impact of the Late Miocene Mediterranean salinity crisis},

author = {Konstantina Agiadi and Niklas Hohmann and Elsa Gliozzi and Danae Thivaiou and Francesca R. Bosellini and Marco Taviani and Giovanni Bianucci and Alberto Collareta and Laurent Londeix and Costanza Faranda and Francesca Bulian and Efterpi Koskeridou and Francesca Lozar and Alan Maria Mancini and Stefano Dominici and Pierre Moissette and Ildefonso Bajo Campos and Enrico Borghi and George Iliopoulos and Assimina Antonarakou and George Kontakiotis and Evangelia Besiou and Stergios D. Zarkogiannis and Mathias Harzhauser and Francisco Javier Sierro and Marta Coll and Iuliana Vasiliev and Angelo Camerlenghi and Daniel García-Castellanos},

doi = {10.1126/science.adp3703},

year  = {2024},

date = {2024-08-29},

urldate = {2024-08-29},

journal = {Science},

volume = {385},

number = {6712},

pages = {986--991},

publisher = {American Association for the Advancement of Science (AAAS)},

abstract = {<jats:p>Massive salt accumulations, or salt giants, have formed in highly restricted marine basins throughout geological history, but their impact on biodiversity has been only patchily studied. The salt giant in the Mediterranean Sea formed as a result of the restriction of its gateway to the Atlantic during the Messinian Salinity Crisis (MSC) 5.97 to 5.33 million years ago. Here, we quantify the biodiversity changes associated with the MSC based on a compilation of the Mediterranean fossil record. We conclude that 86 endemic species of the 2006 pre-MSC marine species survived the crisis, and that the present eastward-decreasing richness gradient in the Mediterranean was established after the MSC.</jats:p>},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tsuboi2024,

title = {The Paradox of Predictability Provides a Bridge Between Micro- and Macroevolution},

author = {Masahito Tsuboi and Jacqueline Sztepanacz and Stephen De Lisle and Kjetil L Voje and Mark Grabowski and Melanie J Hopkins and Arthur Porto and Meghan Balk and Mikael Pontarp and Daniela Rossoni and Laura S Hildesheim and Quentin J-B Horta-Lacueva and Niklas Hohmann and Agnes Holstad and Moritz Lürig and Lisandro Milocco and Sofie Nilén and Arianna Passarotto and Erik I Svensson and Cristina Villegas and Erica Winslott and Lee Hsiang Liow and Gene Hunt and Alan C Love and David Houle},

doi = {10.1093/jeb/voae103},

issn = {1420-9101},

year  = {2024},

date = {2024-08-29},

urldate = {2024-08-29},

journal = {Journal of Evolutionary Biology},

pages = {voae103},

publisher = {Oxford University Press (OUP)},

abstract = {<jats:title>Abstract</jats:title>

               <jats:p>The relationship between the evolutionary dynamics observed in contemporary populations (microevolution) and evolution on timescales of millions of years (macroevolution) has been a topic of considerable debate. Historically, this debate centers on inconsistencies between microevolutionary processes and macroevolutionary patterns. Here, we characterize a striking exception: emerging evidence indicates that standing variation in contemporary populations and macroevolutionary rates of phenotypic divergence are often positively correlated. This apparent consistency between micro- and macroevolution is paradoxical because it contradicts our previous understanding of phenotypic evolution and is so far unexplained. Here, we explore the prospects for bridging evolutionary timescales through an examination of this “paradox of predictability.” We begin by explaining why the divergence-variance correlation is a paradox, followed by data analysis to show that the correlation is a general phenomenon across a broad range of temporal scales, from a few generations to tens of millions of years. Then we review complementary approaches from quantitative-genetics, comparative morphology, evo-devo, and paleontology to argue that they can help to address the paradox from the shared vantage point of recent work on evolvability. In conclusion, we recommend a methodological orientation that combines different kinds of short-term and long-term data using multiple analytical frameworks in an interdisciplinary research program. Such a program will increase our general understanding about how evolution works within and across timescales.</jats:p>},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Hohmann2024,

title = {Identification of the mode of evolution in incomplete carbonate successions},

author = {Niklas Hohmann and Joël R. Koelewijn and Peter Burgess and Emilia Jarochowska},

doi = {10.1186/s12862-024-02287-2},

issn = {2730-7182},

year  = {2024},

date = {2024-08-23},

urldate = {2024-08-23},

journal = {BMC Ecology and Evolution},

volume = {24},

number = {113},

publisher = {Springer Science and Business Media LLC},

abstract = {<jats:title>Abstract</jats:title><jats:sec>

                <jats:title>Background</jats:title>

                <jats:p>The fossil record provides the unique opportunity to observe evolution over millions of years, but is known to be incomplete. While incompleteness varies spatially and is hard to estimate for empirical sections, computer simulations of geological processes can be used to examine the effects of the incompleteness <jats:italic>in silico</jats:italic>.</jats:p>

                <jats:p>We combine simulations of different modes of evolution (stasis, (un)biased random walks) with deposition of carbonate platforms strata to examine how well the mode of evolution can be recovered from fossil time series, and how test results vary between different positions in the carbonate platform and multiple stratigraphic architectures generated by different sea level curves.</jats:p>

              </jats:sec><jats:sec>

                <jats:title>Results</jats:title>

                <jats:p>Stratigraphic architecture and position along an onshore-offshore gradient has only a small influence on the mode of evolution recovered by statistical tests. For simulations of random walks, support for the correct mode decreases with time series length.</jats:p>

                <jats:p>Visual examination of trait evolution in lineages shows that rather than stratigraphic incompleteness, maximum hiatus duration determines how much fossil time series differ from the original evolutionary process. Gradual directional evolution is more susceptible to stratigraphic effects, turning it into punctuated evolution. In contrast, stasis remains unaffected.</jats:p>

              </jats:sec><jats:sec>

                <jats:title>Conclusions</jats:title>

                <jats:p>• Fossil time series favor the recognition of both stasis and complex, punctuated modes of evolution.</jats:p>

                <jats:p>• Not stratigraphic incompleteness, but the presence of rare, prolonged gaps has the largest effect on trait evolution. This suggests that incomplete sections with regular hiatus frequency and durations can potentially preserve evolutionary history without major biases. Understanding external controls on stratigraphic architectures such as sea level fluctuations is crucial for distinguishing between stratigraphic effects and genuine evolutionary process.</jats:p>

              </jats:sec>},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Hohmann2022,

title = {Global compilation of surface mixed layer parameters (sedimentation rate, bioturbation depth, mixing intensity) from marine environments: The SMLBase v1.0},

author = {Niklas Hohmann},

url = {https://www.frontiersin.org/articles/10.3389/feart.2022.1013174/full},

doi = {10.3389/feart.2022.1013174},

year  = {2022},

date = {2022-12-06},

urldate = {2023-12-06},

journal = {Frontiers in Earth Science},

volume = {10},

pages = {1013174},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Hohmann2021,

title = {Incorporating information on varying sedimentation rates into paleontological analyses},

author = {Niklas Hohmann},

url = {https://doi.org/10.2110/palo.2020.038

},

doi = {10.2110/palo.2020.038},

issn = {1938-5323},

year  = {2021},

date = {2021-02-24},

journal = {Palaios},

volume = {36},

number = {2},

pages = {53–67},

abstract = {Stratigraphic changes in the clustering of first or last taxon occurrences are a joint expression of evolutionary, ecological, taphonomic, and sedimentological processes. Sedimentation rates control the degree of sedimentary dilution and condensation and thus alter the time contained in a given thickness of sediment. However, it remains poorly explored quantitatively how distinct the stratigraphic patterns in the first and last occurrences can be under different deposition models with a constant thickness of accumulated sediment. Here, I present an algorithm that translates ecological or evolutionary signals between time and stratigraphic height. It is implemented for R Software as the package DAIME and complemented by tools to quantify the uncertainties associated with the construction of deposition models. By modeling the stratigraphic expression of the K/Pg extinction and an earlier extinction pulse potentially linked to Deccan volcanism on Seymour Island under varying sedimentation rates, I show that (1) clustering of last occurrences ∼ 250 kyr prior to the K/Pg boundary can be equally explained by a stronger earlier extinction pulse or prolonged intervals with reduced sediment accumulation rate, but (2) when the temporal variability in sedimentation rate is known, the most plausible extinction dynamics can still be identified. The approach is applicable for any type of information transported as a part of the sedimentary record (e.g., fossils or trace elements) or data derived from it (e.g., isotope ratios and rates of morphological evolution).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{https://doi.org/10.1029/2020PA003979,

title = {Reconstructing Depositional Rates and Their Effect on Paleoenvironmental Proxies: The Case of the Lau Carbon Isotope Excursion in Gotland, Sweden},

author = {E. Jarochowska and T. Nohl and M. Grohganz and N. Hohmann and T.R.A. Vandenbroucke and A. Munnecke},

url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020PA003979},

doi = {https://doi.org/10.1029/2020PA003979},

year  = {2020},

date = {2020-01-01},

journal = {Paleoceanography and Paleoclimatology},

volume = {35},

number = {12},

pages = {e2020PA003979},

abstract = {Abstract Variations in depositional rates affect the temporal depositional resolutions of proxies used for paleoenvironmental reconstructions; for example, condensation can make reconstructed environmental changes appear very abrupt. This is commonly addressed by transforming proxy data using age models, but this approach is limited to situations where numerical ages are available or can be reliably inferred by correlation. Here we propose a new solution, in which relative age models are constructed based on proxies for depositional rates. As a case study, we use the onset of the late Silurian Lau Carbon Isotope Excursion (LCIE) in Gotland, Sweden. The studied succession is a gradual record of shallowing upward in a tropical, neritic carbonate platform. As proxies for depositional rates we tested thorium concentration, carbonate content, and the concentration of pelagic palynomorphs. These three proxies were used to create relative age models using the previously published DAIME model. We applied these models to transform the δ13Ccarb values as well as concentrations of selected redox-sensitive elements. The three relative age models yielded qualitatively similar results. In our case study, variations in depositional rates resulted in peaks of redox proxies appearing up to 76% higher when taken at face value, compared to when accounting for these rates. In the most extreme cases, our corrections resulted in a reversal in the stratigraphic trend of elemental concentrations. This approach can be applied and developed across depositional setting and types of paleoenvironmental proxies. It provides a flexible tool for developing quantitative models to improve our understanding of the stratigraphic record.},

note = {e2020PA003979 2020PA003979},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{10.7717/peerj.8011,

title = {Enforced symmetry: the necessity of symmetric waxing and waning},

author = {Niklas Hohmann and Emilia Jarochowska},

url = {https://doi.org/10.7717/peerj.8011},

doi = {10.7717/peerj.8011},

issn = {2167-8359},

year  = {2019},

date = {2019-01-01},

journal = {PeerJ},

volume = {7},

pages = {e8011},

abstract = {A fundamental question in ecology is how the success of a taxon changes through time and what drives this change. This question is commonly approached using trajectories averaged over a group of taxa. Using results from probability theory, we show analytically and using examples that averaged trajectories will be more symmetric as the number of averaged trajectories increases, even if none of the original trajectories they were derived from is symmetric. This effect is not only based on averaging, but also on the introduction of noise and the incorporation of a priori known origination and extinction times. This implies that averaged trajectories are not suitable for deriving information about the processes driving the success of taxa. In particular, symmetric waxing and waning, which is commonly observed and interpreted to be linked to a number of different paleobiological processes, does not allow drawing any conclusions about the nature of the underlying process.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}