113 research outputs found
Rapid recycling of coral mass-spawning products in permeable reef sediments.
No full textDuring the annual synchronous release of gametes by corals, a large amount of energy-rich organic material is released to the reef environment. In November 2001, we studied a minor spawning event at Heron Island in the Great Barrier Reef (GBR), Australia. Laboratory experiments showed that egg release by the staghorn coral Acropora millepora amounted to 19 ± 15 g dry mass (mean ± SE, n = 8) per m2 coral surface. Carbon content reached 60.1 ± 4.0% and nitrogen content 3.6 ± 0.4% of the egg dry mass. During this minor spawning period, Acropora corals from the reef crest released 7 g C and 0.4 g N as eggs m-2 reef. In situ experiments (n = 11) using stirred benthic chamber measurements revealed that the sedimentary O2 consumption (SOC) of the lagoon sediments increased sharply immediately after the coral spawning. Extreme SOC rates of 230 mmol O2 m-2 d-1 were reached 2 d after the event, exceeding the pre-spawning rate by a factor of 2.5. This maximum was followed by a steep decrease in SOC rates that gradually levelled off and reached pre-spawning values 11 d after the event. The immediate and strong response of SOC shows that the coral spawning event provides a strong food impulse to the benthic food chain. Our results demonstrate high decomposition efficiency of permeable carbonate reef sands and underline the role of these sediments as a biocatalytical recycling system in the oligotrophic reef environment
Corrigendum to “Degradation of Deepwater Horizon oil buried in a Florida beach influenced by tidal pumping” [Mar. Pollut. Bull. 126 (2018) 488–500]
No full textPlease note that the acknowledgements of our article “Degradation of Deepwater Horizon oil buried in a Florida beach influenced by tidal pumping” by: Huettel, Markus; Overholt, Will A.; Kostka, Joel E.; Hagan, Christopher; Kaba, John; Wells, Wm. Brian; Dudley, Stacia that appeared in MARINE POLLUTION BULLETIN, Volume: 126, Pages: 488–500 in January 2018 were updated to include the DOI identifiers for the data presented in this article. This research was made possible in part by grants from The Gulf of Mexico Research Initiative (231611-00) (RFP V, DEEP-C and C-IMAGE II) and in part by grants from the National Science Foundation (OCE-1044939 and OCE-1057417), the Florida Institute of Oceanography (FIO 4710-1101-00-1), and the Northern Gulf Institute (NG1 191001-306811-03). Data are archived at the National Center for Biotechnology Information (NCBI) under BioProject ID PRJNA294056 and publicly available through the Gulf of Mexico Research Initiative Information & Data Cooperative (GRIIDC) at https://data.gulfresearchinitiative.org [DOI: https://doi.org/10.7266/N7765CV9, DOI: https://doi.org/10.7266/N7XW4HBZ, DOI: https://doi.org/10.7266/N7BZ64J8, DOI: https://doi.org/10.7266/N73J3BGD, DOI: https://doi.org/10.7266/N7PZ56VV, DOI: https://doi.org/10.7266/N7PG1Q83, DOI: https://doi.org/10.7266/N7T72FZZ, DOI: https://doi.org/10.7266/N78C9TSB, DOI: https://doi.org/10.7266/N7MG7N1S]. The authors would like to apologise for any inconvenience caused
Structural Change in the Dairy Sectors of Germany and The Netherlands - A Markov Chain Analysis
No full textWith the milk quota announced to be abolished in the future, the dairy sector is going to face a significant policy regime shift. This paper sets out to analyze the impact of milk quotas on the dairy farm structure of two important milk producing member states: Germany and the Netherlands. Based on proper behavioral assumptions, non stationary Markov chain models are specified and estimated using a generalized cross entropy procedure, which takes into account both sample and prior information. Moreover four mobility indicators characterizing structural change are developed and calculated. Structural change in the dairy sector as measured by the mobility measures is faster in West Germany than in the Netherlands. However, in the transition region East Germany structural change outpaces that of the traditional German and Dutch dairy sectors by a factor two or more. The introduction of milk quotas as of April 1, 1984 reduced overall farm mobility for the Netherlands, but increased mobility in West Germany. However, in both cases the milk quotas lead to an increase in upward mobility.Markov Chain, Milk Quota, Structural Change, Livestock Production/Industries,
Dynamik der Feinfraktion im Oberflaechenhorizont permeabler Schelfsedimente
No full textThis work is part of ongoing research on the exchange of matter between marine sediments and the overlying water. The study, a subproject of the DFG graduate college 'Material Flux in Marine Geosystems' at Bremen University, was conducted at the Max Planck Institute for Marine Microbiology. My project was initiated by a group of scientists there, who investigate fluxes across the sediment-wate interface and their consequences for sedimentary biogeochemical processes. Supervised by Prof. Bo B. Joergensen and with Dr. Stefan Forster and Dr. Markus Huettel as my mentors, I focused on evidence and features of advective interfacial transport in an intertidal sandflat. During field work near Sylt island, even most adverse weather conditions could not deter Martina Alisch from providing technical assistance. The co-workers of the BAH Wadden Sea Station in List/Sylt kindly shared their lab space and their knowledge on the study area with us. I appreciate Markus Huettel, Stefan Forster and Bo Joergensen for inspiring discussions, constructive criticism and experienced advice. My room-mate Jakob Zopfi and many other colleagues created a pleasant atmosphere to work in, and dear friends kept encouraging me. Finally, my parents are thanked for continuously supporting my pursuit of education. (orig.)Available from TIB Hannover: RO 7630(155) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
Temperature and dissolved oxygen recorded two PME Mindot O2 loggers in the Florida Keys from 11-17 July 2017
No full textDataset: 3OEC-instrument Temperature and Dissolved OxygenThis dataset presents the temperature and oxygen data recorded by the two PME Minidot loggers. The loggers were deployed July 11-17, 2017 in a subtropical inner shelf environment (Salinity: 35-36, temperature: 28-31°C) approximately 9 km south of Long Key in the Florida Keys (24° 43.52'N, 80° 49.85'W). The site was located at 9 ± 1 m water depth near the center of a large flat carbonate platform covered with coral sand. The instruments were installed on the 3OEC instrument at ~35 cm above the sediment-water interface.
For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/849915NSF Division of Ocean Sciences (NSF OCE) OCE-1334117, NSF Division of Ocean Sciences (NSF OCE) OCE-133484
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