Der Darstellungs-Dienst beinhaltet folgende Eutrophierungsparameter: max. Bedeckungsgrad von Seegras bzw. Grünalgen und ist relevant für den MSRL-Deskriptor 5 im Nationalpark Schleswig-Holsteinisches Wattenmeer. Der Dienst wurde im Rahmen des Projektes MDI-DE (Marine Daten-Infrastruktur Deutschland) erstellt. Die Daten werden im Rahmen des trilateralen Makrophyten-Monitoring-Programmes (TMAP) mittels Flugzeugkartierungen erhoben. Dieser Dienst gibt von den drei Kartierungen nur die Daten eines Fluges pro Jahr aus, bei dem der Bedeckungsgrad am höchsten war. Der Bedeckungsgrad wird in 2 Dichteklassen der geschlossenen Bestände angegeben. Die Identifizierung der Flächen ist erst ab ca. 20% Deckung möglich. Die Daten wurden auf Basis einzelner Shapes in einer Datenbank zusammengeführt. Aus den Jahren 1989 und 1990 liegen ähnliche, aber in der Klassifikation abweichende, Kartierungen im Rahmen der Ökosystemforschung Schleswig-Holsteinsches Wattenmeer vor. Dieser Dienst stellt sowohl für Seegras als auch für Grünalgen eine Kartenansicht der max. Bedeckung ab dem Jahr 1994 mit einzelnen Jahres-Layern bereit.
Der Download-Dienst beinhaltet folgende Eutrophierungsparameter: max. Bedeckungsgrad von Seegras bzw. Grünalgen und ist relevant für den MSRL-Deskriptor 5 im Nationalpark Schleswig-Holsteinisches Wattenmeer. Der Dienst wurde im Rahmen des Projektes MDI-DE (Marine Daten-Infrastruktur Deutschland) erstellt. Die Daten werden im Rahmen des trilateralen Makrophyten-Monitoring-Programmes (TMAP) mittels Flugzeugkartierungen erhoben. Dieser Dienst gibt von den drei Kartierungen nur die Daten eines Fluges pro Jahr aus, bei dem der Bedeckungsgrad am höchsten war. Der Bedeckungsgrad wird in 2 Dichteklassen der geschlossenen Bestände angegeben. Die Identifizierung der Flächen ist erst ab ca. 20% Deckung möglich. Die Daten wurden auf Basis einzelner Shapes in einer Datenbank zusammengeführt. Aus den Jahren 1989 und 1990 liegen ähnliche, aber in der Klassifikation abweichende, Kartierungen im Rahmen der Ökosystemforschung Schleswig-Holsteinsches Wattenmeer vor. Dieser Dienst stellt sowohl für Seegras als auch für Grünalgen je eine Gesamttabelle ab dem Jahr 1994 bereit, also auch einzelne Jahreslayer: Seegras: ZOS_ALLYEARS_MAXCOVab1994 und Grünalgen: GRALG_ALLYEARS_MAXCOVab1994.
The data were generated during an experiment simulating different frequencies of heatwaves (zero, one and three) in late spring/summer 2015. The experiment was carried out at the Kiel Outdoor Benthocosm (KOB) of GEOMAR Helmholtz Centre for Ocean Research Kiel, located at the Kiel Fjord. The biomass of filamentous algae was quantified from the most abundant genus occurring inside the tanks, i.e. Ceramium sp. The biomass of Zostera marina and Fucus vesiculosus was estimated from growth rates measurements carried out every 15 days. The biomass of all macrophytes was converted to carbon using specific carbon contents measured concomitantly with stable isotopes (https://doi.pangaea.de/10.1594/PANGAEA.966179). Respiration and primary production measurements were carried out on 09.08.2015 for filamentous algae, and on 12.08.2015 for Fucus vesiculosus. To execute these measurements, organisms were kept in gas-tight cylindrical chambers equipped with sensor spots for non-invasive oxygen measurements, which allowed continuous oxygen logging. Throughout the measurements, the chambers were kept inside the KOB tanks to maintain the temperature. The oxygen values were converted to carbon and normalized by the area of the tank (1.53 m2) per day. Note that the data of net primary production and respiration rates of the Z. marina were previously published (https://doi.org/10.1594/PANGAEA.904632). The carbon flux refers to the exports, i.e. biomass that was floating in the tanks, which was considered as carbon leaving (i.e. exported outside of) the system but still usable. The material to quantify the exports was collected every seven days, separated accounting for the contribution of each macrophyte group, dried at 80 °C until the biomass was constant and weighted. The dry weight was converted to carbon using the specific carbon contents measured concomitantly with stable isotopes (https://doi.pangaea.de/10.1594/PANGAEA.966179), and normalized by the area of the tank (1.53 m2) per day.
The data refer to an experiment simulating different frequencies of heatwaves (zero, one and three) in late spring/summer 2015. The experiment was carried out at the Kiel Outdoor Benthocosm (KOB) of GEOMAR Helmholtz Centre for Ocean Research Kiel, located at the Kiel Fjord. The organisms were collected from the mesocosm tanks, stored at -80 °C, dried at 60 °C for at least 48 hours, and ground with agate mortar and pestle. The ground material was subsampled, weighed and placed into tin capsules (3.2 × 4.0 mm, Hekatech, Wegberg, Germany). These samples were analysed with an elemental analyser system (NA 1110, Thermo, Milan, Italy) connected to a temperature-controlled gas chromatography oven (SRI 9300, SRI Instruments, Torrance, CA, USA) and to an isotope-ratio mass spectrometer (DeltaPlus Advantage, Thermo Fisher Scientific) as described in Hansen et al. (2009), https://doi.org/10.1002/rcm.4267.
Seagrass meadows play a significant role in the formation of carbonate sediments, serving as a substrate for carbonate-producing epiphyte communities. The magnitude of the epiphyte load depends on plant structural and physiological parameters, related to the time available for epiphyte colonization. Yet, the carbonate accumulation is likely to also depend on the carbonate saturation state of seawater (Omega) that tends to decrease as latitude increases due to decreasing temperature and salinity. A decrease in carbonate accumulation with increasing latitude has already been demonstrated for other carbonate producing communities. The aim of this study was to assess whether there was any correlation between latitude and the epiphyte carbonate load and net carbonate production rate on seagrass leaves. Shoots from 8 different meadows of the Zostera genus distributed across a broad latitudinal range (27 °S to up to 64 °N) were sampled along with measurements of temperature and Omega. The Omega within meadows significantly decreased as latitude increased and temperature decreased. The mean carbonate content and load on seagrass leaves ranged from 17 % DW to 36 % DW and 0.4-2.3 mg CO3/cm**2, respectively, and the associated mean carbonate net production rate varied from 0.007 to 0.9 mg CO3/cm**2/d. Mean carbonate load and net production rates decreased from subtropical and tropical, warmer regions towards subpolar latitudes, consistent with the decrease in Omega. These results point to a latitudinal variation in the contribution of seagrass to the accumulation of carbonates in their sediments which affect important processes occurring in seagrass meadows, such as nutrient cycling, carbon sequestration and sediment accretion.
This study simulated a 9-months warming scenario on the common seagrass Zostera marina from winter into summer (December 2015 - August 2016) in the Western Baltic Sea (Kiel Fijord), using outdoor mesocosms. Two treatments were applied: Ambient temperature regime (Ambient) and Ambient + 3.6C (Heat) over the entire course of the experiment. Temperature regimes were compared to the 22-year temperature average in the area. This dataset shows final above and below ground biomass per shoot for each shoot measured. The organization of the data is hierarchical: Treatment (Heat, Ambient), Benthocosms number (6 benthocosms per treatment), Seagrass box number (4 boxes per benthocosm), shoot number (originally 6 shoots per box, some were lost throughout the experiment). Unit of biomass is g dry weight per shoot.
A total of 169 sediment cores (30 cm length; 5.5 cm inner diameter) were sampled in seagrass meadows (n = 110 cores) and nearby unvegetated sediments (n = 59 cores). Nine cores (with some exceptions) were collected at each site, from three sublocations: (1) in the high-density part of the meadow ("dense seagrass" hereafter), (2) low density or fringe of the meadow ("sparse seagrass" hereafter), and (3) adjacent unvegetated sediments at least 5 m from seagrass ("unvegetated"). Dense and sparse seagrass sublocations are collectively referred to as "seagrass-vegetated" sediments or sublocations. Sediment cores taken within the seagrass meadow were sampled at least 10 m apart from each other. Several biophysical parameters were collected alongside each core, including seawater depth, sediment grain size, current velocity at the seafloor, and seagrass complexity. The measure of "seagrass complexity" was defined as the product of seagrass canopy height and shoot density, to obtain the sum of leaf heights within a unit of area (in m/m2). Cores were collected between 1 and 5 m seawater depth manually via self-contained underwater breathing apparatus (SCUBA) divers pounding impact-resistant PVC tubes into the sediment with a rubber mallet. Sediment total Corg was determined using an Elemental Analyzer (EURO EA Elemental Analyzer).
13 response variable have been measured for Fucus vesiculosus and Zostera marina. Year: 2015 Where: Kiel Outdoor Benthocosm Treatments: - Co (0HW) = ambient treatment with no heatwaves - 1HW = one summer heatwave - 3HWs = three heatwaves, 2 spring/early summer heatwaves After 3HW means end of the experiment.
This study simulated a 9-months warming scenario on the common seagrass Zostera marina from winter into summer (December 2015 - August 2016) in the Western Baltic Sea (Kiel Fijord), using outdoor mesocosms. Two treatments were applied: Ambient temperature regime (Ambient) and Ambient + 3.6C (Heat) over the entire course of the experiment. Temperature regimes were compared to the 22-year temperature average in the area. This dataset shows monthly or bi-monthly measurements taken of each shoot: Number of shoots [no. per box], Number of new shoots at counting event [no. per box], number of new shoots per month [no. per box per month], and number of flowering shoots [no. per box]. Derived data in %: Number of shoots [% of original shoots], number of new shoots [% of original shoots], number of flowering shoots [% of original shoots]. The organization of the data is hierarchical: Treatment (Heat, Ambient), Benthocosms number (6 benthocosms per treatment), Seagrass box number (4 boxes per benthocosm), shoot number (originally 6 shoots per box, some were lost throughout the experiment).
This study simulated a 9-months warming scenario on the common seagrass Zostera marina from winter into summer (December 2015 - August 2016) in the Western Baltic Sea (Kiel Fijord), using outdoor mesocosms. Two treatments were applied: Ambient temperature regime (Ambient) and Ambient + 3.6C (Heat) over the entire course of the experiment. Temperature regimes were compared to the 22-year temperature average in the area. This dataset shows daily values of salinity in each benthocosms and in the adjacent fjord. Benthocosms A1, A2, C1, C2, E1, E2 = Heat; Benthocosms B1, B2, D1, D2, F1, F2 = Ambient.
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