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Articles by Jochen Halfar
Rhodoliths can act as daily resolution paleotemperature archives in the Red Sea
Abstract Long-term, high-frequency temperature records are critical for evaluating the vulnerability of marine ecosystems to ongoing ocean warming. Commonly used paleoceanographic archives, such as corals and bivalves, face regional and ecological constraints. Rhodoliths, free-living coralline red algal nodules, are established and globally accessible alternatives, yet their complex three-dimensional growth structures hinder the construction of continuous age models.
Crustose coralline algae biomineral-bound nitrogen isotopes provide a baseline to reconstruct coral trophic strategies
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Abstract Coral resilience is shaped by trophodynamic flexibility – the balance between photosymbiont-derived energy and feeding-based heterotrophy – yet quantifying this balance across taxa and through time remains difficult. Nitrogen (N) isotopes are a powerful tool to investigate trophic strategies, but their use requires information on local isotopic baselines.
By Jonathan Jung, Tanja Wald, Alan Foreman, Dorte Janussen, Simone Moretti, Nicolas N. Duprey, Dario Marconi, Aaron O’Dea, Ralf Schiebel, Jochen Halfar, Cindy Fernández-García, Mary Donovan, Amy Frazier, Katie Cramer, Gerald H. Haug, Daniel M. Sigman, Alfredo Martínez-García, Aaron L. Bieler, Carmen Pérez-Medina, Madeline Berger
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Nature
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Keystone predators govern the pathway and pace of climate impacts in a subarctic marine ecosystem
Report View ORCID ProfileDouglas B. Rasher1,*, View ORCID ProfileRobert S. Steneck2, View ORCID ProfileJochen Halfar3, View ORCID ProfileKristy J. Kroeker4, View ORCID ProfileJustin B. Ries5, View ORCID ProfileM. Tim Tinker4,6, View ORCID ProfilePhoebe T. W. Chan3,7, View ORCID ProfileJan Fietzke8, View ORCID ProfileNicholas A. Kamenos9, View ORCID ProfileBrenda H. Konar10, View ORCID ProfileJonathan S. Lefcheck11, View ORCID ProfileChristopher J. D. Norley12, View ORCID ProfileBenjamin P.
The Potential Pros and Cons of Seabed Mining
The International Seabed Authority recently concluded its annual meeting in Kingston, Jamaica. Many people have never heard of this relatively obscure board, but the results of their deliberations may have profound implications for the health of the ocean. The topic of this year’s meeting was to develop guidelines for seabed mining, an up-and-coming method of resource extraction that has many potential benefits—and serious potential for harm.
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