Browsing by Author "Rautenbach, Sarah A."
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- Assessment of the marine biodegradation and suitability of textile carrier substrates for Zostera marina transplantationPublication . Rautenbach, Sarah A.; Engelen, Aschwin Hillebrand; Troch, Marleen De; Pieraccini, RiccardoSeagrass meadows provide essential eco-system services for humankind but have been declining over the past and still ongoing, mainly attributed to anthropogenic disturbances. The development of cost-effective and large-scale strategies for seagrass restoration has been challenging. In this study fundamental knowledge was generated to identify textile fabrics from natural derivatives to serve as carrier substrate for transplantation purposes. In a series of experiments the biodegradation behavior of textiles was assessed, differing in material and design. Specimen were buried in the intertidal of the Ria Formosa Lagoon and retrieved after set intervals. Weight, tensile strength and oxygen consumption rate were used as descriptors for biodegradation. The least degraded fabric was composed from coir, followed by the jute and sisal layouts, which performed similarly. The response of Zostera marina shoots towards the textiles was analyzed by placing shoots, incorporated into the fabrics, into mesocosms. Survival rates along with the development of new leaves was higher in shoots growing on sisal layouts than in controls and shoots in coir nets. This study demonstrated that the fixation of the plants onto a dense mesh as the sisal one offers significant support for shoots to grow on, resulting in superior health compared to single lose shoots. Additionally, earlier induced biodegradation in sisal layouts possibly fostered shoots with plant-growth-supporting substrates, according to the health state of these shoots. Hence, time of biodegradation was found to be vital for seagrass transplantation. Rapid degradation, leaving no carrier substrate as in controls and fertilized shoots, was proven to reduce survival chances. Retarded degradation like in coir fabrics, decelerates the supply of growth supporting substrates. Concluding, the dense sisal mesh was found to be the most successful fabric for transplantation of Zostera marina due to its biodegradation rate, high tensile strength, facilitating handling, along with sufficient fixation of the shoots.
- High-resolution observations of the ocean upper layer south of Cape St. Vincent, the western northern margin of the Gulf of CádizPublication . Rautenbach, Sarah A.; Mendes da Silva de Sousa, Carlos A; Carapuço, Mafalda; Relvas, PauloThis article presents an Eulerian physical and biogeochemical dataset from the Iberian Margin Cape St. Vincent Ocean observatory (IbMa-CSV), a facility of the European Multidisciplinary Seafloor and water column Observatory European Research Infrastructure Consortium (EMSO-ERIC), located 10 nautical miles south of Cape St. Vincent (Portugal), the southwest tip of the Iberian Peninsula and western limit of the northern margin of the Gulf of Cádiz (GoC). The observatory was installed on the shelf break, and the data time series spans 4 months for most of the variables. The upper 150 m were sampled intensively with a wave-powered vertical profiler at an average rate of 4.5 profiles per hour recording at 2 Hz when ascending at an approximate velocity of 0.2 m s−1 and 10 Hz when descending at a variable velocity. The vertical resolution was always higher than 0.2 m. Measured channels were conductivity, temperature, pressure, chlorophyll a, dissolved O2 concentration, and turbidity. Derived channels are sea pressure, depth, salinity, speed of sound, specific conductivity, dissolved O2 saturation, density anomaly, spiciness, and Brunt–Väisälä frequency. The acquired dataset includes the flow velocity and direction along the water column, taken from an upward-looking 300 kHz acoustic Doppler current profiler (ADCP) recorded every hour for 3 m depth bins extending the same depth range of the vertical profiler. A standard quality-control scheme was applied to the dataset. The dataset is preserved for multiple use and is accessible in the Sea Open Scientific Data Publication (SEANOE) repository via the following address: https://doi.org/10.17882/94769 (Rautenbach et al., 2022).
- High-resolution observations of the ocean upper layer south of Cape St. Vincent, the western northern margin of the Gulf of CádizPublication . Rautenbach, Sarah A.; Mendes da Silva de Sousa, Carlos A; Carapuço, Mafalda; Relvas, PauloThis article presents an Eulerian physical and biogeochemical dataset from the Iberian Margin Cape St. Vincent Ocean observatory (IbMa-CSV), a facility of the European Multidisciplinary Seafloor and water column Observatory European Research Infrastructure Consortium (EMSO-ERIC), located 10 nautical miles south of Cape St. Vincent (Portugal), the southwest tip of the Iberian Peninsula and western limit of the northern margin of the Gulf of C & aacute;diz (GoC). The observatory was installed on the shelf break, and the data time series spans 4 months for most of the variables. The upper 150 m were sampled intensively with a wave-powered vertical profiler at an average rate of 4.5 profiles per hour recording at 2 Hz when ascending at an approximate velocity of 0.2 ms(-1) and 10 Hz when descending at a variable velocity. The vertical resolution was always higher than 0.2 m. Measured channels were conductivity, temperature, pressure, chlorophyll a, dissolved O2 concentration, and turbidity. Derived channels are sea pressure, depth, salinity, speed of sound, specific conductivity, dissolved O2 saturation, density anomaly, spiciness, and Brunt-V & auml;is & auml;l & auml; frequency. The acquired dataset includes the flow velocity and direction along the water column, taken from an upward-looking 300 kHz acoustic Doppler current profiler (ADCP) recorded every hour for 3 m depth bins extending the same depth range of the vertical profiler. A standard quality-control scheme was applied to the dataset. The dataset is preserved for multiple use and is accessible in the Sea Open Scientific Data Publication (SEANOE) repository via the following address: 10.17882/94769 (Rautenbach et al., 2022).