This dataset reports physiological measurements of two bivalve species, Mytilus edulis (blue mussel) and Magallana gigas (Pacific oyster), obtained during a three-month mesocosm experiment conducted in Sylt, Germany, in 2023. Physiological data were collected between 27 April 2023 and 25 June 2023.Twelve mesocosms were used to investigate the effects of temperature on individual-level physiological traits, with treatments including ambient temperature and ambient +3°C. Parameters measured include clearance rate, ingestion rate, and respiration rate. Environmental variables such as water temperature, depth, and sampling time were recorded for each measurement. Individual bivalves were labeled for tracking, and species identification followed WoRMS taxonomy. Measurements were performed using handheld multiparameter instruments and laboratory analyses. The dataset provides high-resolution, individual-based physiological responses of bivalves to moderate warming, supporting research on temperature-dependent feeding, metabolic processes, and energy flux in coastal ecosystems.
We analyzed concentrations of dissolved and particulate trace metals, including iron (Fe), manganese (Mn), vanadium (V), molybdenum (Mo), thallium (Tl), and rare earth elements (REE), during a mesocosm-based phytoplankton summer bloom mimicking the intertidal zone of the southern North Sea (Jade Bay). The studies aimed to identify key drivers controlling their biogeochemical cycling in dynamic, high-productivity coastal environments. Our results highlight the tidally influenced coastal zone as a critical interface that alters the behavior of supposedly conservative elements such as Mo and Tl (Mori et al., 2021) as well as natural and anthropogenic REE (incl., lanthanum, samarium, and gadolinium) (Mori et al., under review). Trace metal concentrations and shale-normalized REE patterns, determined by quadrupole inductively coupled plasma–mass spectrometry (ICP-MS) and inductively coupled plasma–optical emission spectrometry (ICP-OES), were combined with biogeochemical bulk parameters and pigment-based assessments of phytoplankton growth and community composition (Mustaffa et al., 2020). Trace metal and REE cycling were evaluated in relation to phytoplankton dynamics, particulate organic matter composition (C, N, P), dissolved organic carbon, total dissolved nitrogen, and macronutrient concentrations (nitrate, ammonium, silicate, and inorganic phosphate). The dataset was obtained during a Planktotron-based mesocosm experiment conducted within the framework of the Coastal Ocean Darkening project (Mustaffa et al., 2020).
Der Datensatz aus Karte 4b des Niedersächsischen Landschaftsprogramms enthält die für die Wasserrahmenrichtlinie (WRRL) relevanten Küstengewässer, die seewärtig an die Übergangsgewässer / Ästuare anschließen und bis eine Seemeile seewärts der sogenannten Basislinie in die Hoheitsgewässer hineinreichen. Der Bereich außerhalb der Küstengewässer bis an die Niedersächsische Hoheitsgrenze (12-Seemeilen-Grenze) wird als Küstenmeer bezeichnet und dient hier zur Darstellung der Küstenlebensräume. Karte 4b „Landesweiter Biotopverbund“ stellt die landesweite Biotopverbundplanung dar, die sich aus verschiedenen Komponenten zusammensetzt. Ausgewählte qualifizierte Biotopflächen des Offenlandes, der Wälder, der Fließgewässer mit ihren Auen gemäß Aktionsprogramm Niedersächsische Gewässerlandschaften bilden als Kernflächen der jeweiligen Biotopobergruppen die Basis der einzelnen Verbundsysteme, ergänzt um die länderübergreifenden Biotopverbundachsen des BfN sowie ausgewählte Haupt- und Nebenachsen des Wildkatzenwegeplans BUND. Quellennachweis: © 2025, daten@nlwkn.niedersachsen.de
The rewetting of drained peatlands is a promising measure to mitigate carbon dioxide (CO2) emissions by preventing the further mineralization of the peat soil through aeration. While freshwater rewetted peatlands can be significant methane (CH4) sources in the short-term, in coastal ecosystems the input of sulfate-rich seawater could potentially mitigate these emissions. The purpose of the data collection was to examine whether the presence of sulfate, known as an alternative electron acceptor, can cause lower CH4 production and thus, emissions by favoring the growth of sulfate-reducers, which outcompete methanogens for substrate. We therefore investigated underlying variables such as the methane-cycling microbial community along with CH4 fluxes and set them in context with CO2 fluxes along a transect in a coastal peatland before and directly after rewetting. In this way, a conclusion about the short-term greenhouse gas mitigation potential of brackish water rewetting of coastal peatlands could be drawn. This data collection consists of six data sets, with direct comparisons before and after rewetting of CO2 and CH4 fluxes (Tab. 2) and associated microbial communities (Tab. 1) being the main data. Pore water geochemistry (Tab. 1 and 3) and surface water parameters (Tab. 4) were collected simultaneously to provide potential explanatory variables. The sampling of continuous water level (Tab. 5) within wells and atmospheric weather data (air and soil temperature, relative humidity, photosynthetic photon flux density; Tab. 6) from a weather station was done in addition. Measurements started in June/July/August 2019 after field installation was finalized and were conducted on the drained coastal fen "Polder Drammendorf" on the island of Rügen in North-East Germany. On 26th November 2019, the dike was opened and channeled in order to rewet the peatland with brackish water. Before, the dike separated the peatland from the adjacent bay "Kubitzer Bodden", which is part of a brackish lagoon system connected to the Baltic Sea. Therefore, the peatland was nearly completely flooded and now resembles a shallow lagoon with high fluctuating water levels. We measured along a humidity (pre-rewetting)/water level (post-rewetting) gradient (stations 0-8) towards and across the main North-South oriented drainage ditch, including four stations on the Eastern side of the ditch (1–4), two ditch stations (0, 5) and two stations (6, 7) on the Western side of the ditch. Station 8 was chosen as an additional station farther towards the adjacent bay on the Western side, but was only accessible before rewetting. CH4 and CO2 fluxes (stations 0-7) were calculated from online gas concentrations measurements using laser-based analyzers and manual closed chambers (Livingston, G. P., & Hutchinson, G. (1995). Enclosure-based measurement of trace gas exchange: Applications and sources of error. In P.A. Matson, & R.C. Harriss (Eds.). Biogenic trace gases: Measuring emissions from soil and water (pp. 14–51). Blackwell Science Ltd., Oxford, UK). Soil cores for microbial, dissolved gas concentrations and isotopic analysis were taken using a Russian type peat corer (De Vleeschouwer, F., Chambers, F. M., & Swindles, G. T. (2010). Coring and sub-sampling of peatlands for palaeoenvironmental research. Mires and Peat, 7, 1–10) before and after rewetting. Each time, we took duplicates at stations 1-8 for this rather labor-intensive process and divided the core into four depth sections: surface, 5–20, 20–40 and 40–50 cm. Subsamples for dissolved gases and stable carbon isotope analyses were taken with tip-cut syringes with a distinct volume of 3 ml (Omnifix, Braun, Bad Arolsen, Germany) and immediately placed into NaCl-saturated vials (20 ml, Agilent Technologies, 5182-0837, Santa Clara, USA) leaving no headspace and closed gas-tight using rubber stoppers and metal crimpers (both: diameter 20 mm, Glasgerätebau Ochs, Bovenden, Germany). Absolute abundances of specific functional target genes, including methane- and sulfate-cycling microorganisms, were measured with quantitative PCR (qPCR) after DNA was extracted (GeneMATRIX Soil DNA Purification Kit, Roboklon, Berlin, Germany) and quantified (Qubit 2.0 Fluorometer, ThermoFisher Scientific, Darmstadt, Germany). Surface and pore water parameters were measured in parallel to the gas measurements and soil coring for microbial analyses. Most surface water variables (pH, specific conductivity, salinity, nutrients, oxygen, sulfate and chloride concentrations, DOC/DIC) were measured in-situ using a multiparameter digital water quality meter or taken to the laboratory as water samples for further analysis. Likewise, pore water/soil variables (pH, specific conductivity, nutrients, metals, sulfate and chloride concentrations, CNS) were either measured in-situ or taken to the laboratory as soil samples. While surface water analysis was only conducted in the drainage ditch before rewetting, it was done along the entire transect after rewetting. In contrast, pore water/soil analysis was mostly conducted before rewetting and only repeated occasionally after rewetting where possible.
In diesem Use-Case wird die Entwicklung eines Web-Tools für eine webbasierte Berechnung von Parameterschnittmengen zur Abschätzung von potentiellen Habitaten im Wattenmeer dargestellt. Eine Parameterschnittmenge beschreibt, welcher Wertebereich unterschiedlicher Parameter an welchem Ort gleichzeitig gültig ist. Falls ein Habitat sich beispielsweise durch geringe Wassertiefen, definierte Salzgehalte und bestimmte Bodenschubspannungen auszeichnet, können mittels der Schnittmenge eben genannter Parameter Bereiche identifiziert werden, die diese Bedingungen erfüllen. Ein Habitatkalkulator, bzw. der TrilaWatt Parameterschnittmengenkalkulator (PANDA), wurde in TrilaWatt partizipativ mit Stakeholdern entwickelt und getestet, um so perspektivisch eine Hilfestellung für Habitatfragen im trilateralen Wattenmeer im Sinne eines Web-GIS Systems zu geben. Hierfür wurde eine prototypische Implementierung eines webbasierten Muschelpotentialkarten-WPS durch eine Auswahl von Parametern und Parametergrenzen dynamisch gestaltet, um so bspw. Lebensräume, oder auch Wattflächen aus TrilaWatt Daten filtern und exportieren zu können. Literatur: Aue, Hendrik; Wiemers, Sven; Trautwein, Simon; Lepper, Robert; Lehfeldt, Rainer (2024): Web-GIS gestützte Habitatklassifizierung. Vorstellung des Parameterschnittmengenkalkulators (PANDA). https://doi.org/10.18451/TRILAW_2024_06
This dataset comprises abiotic parameters measured during a mesocosm experiment using the AWI Sylt Outdoor Mesocosm (AWISOM) facility (Dummermuth et al., 2023) conducted on the island of Sylt, Germany, in 2022. The experiment spanned approximately three months, beginning on 23 March 2022. A total of 12 mesocosms were deployed, with four mesocosms assigned to each of three temperature treatments: in situ ambient, ambient +1.5 °C, and ambient +3.0 °C. Water samples were collected from each mesocosm at a depth of 0.1 m on 67 discrete sampling days. The sampling frequency varied by parameter, with some variables measured daily and others once or several times per week. Recorded parameters include water temperature, dissolved oxygen, pH (NBS scale), conductivity, chlorophyll a, total alkalinity, and concentrations of dissolved inorganic nutrients (phosphate, nitrate, nitrite, ammonium, and silicate). Measurements were carried out using multiparameter probes and laboratory methods. The dataset provides a multi-parameter time series from a controlled coastal mesocosm experiment designed to investigate the effects of warming on musselbank communities in the Wadden Sea.
This dataset comprises abiotic parameters measured during a mesocosm experiment using the AWI Sylt Outdoor Mesocosm (AWISOM) facility conducted on the island of Sylt, Germany, in 2023. The experiment spanned approximately three months, beginning on 16 March 2023. A total of 12 mesocosms were deployed, with six mesocosms assigned to each of two temperature treatments: in situ ambient, and ambient +3.0 °C. Water samples were collected from each mesocosm at a depth of 0.1 m on 103 discrete sampling days. The sampling frequency varied by parameter, with some variables measured daily and others once or several times per week. Recorded parameters include water temperature, dissolved oxygen, pH (HBS scale), conductivity, chlorophyll a, total alkalinity, and concentrations of dissolved inorganic nutrients (phosphate, nitrate, nitrite, ammonium, and silicate). Measurements were carried out using multiparameter probes and laboratory methods. The dataset provides a multi-parameter time series from a controlled coastal mesocosm experiment designed to investigate the effects of warming on musselbank communities in the Wadden Sea.
With increasing global change, coastal protection measures are becoming increasingly important for preserving our coastal features and infrastructure. Coastal protection often comes in the form of artificial structures however, artificial structures can also appear as renewable energy projects, maritime infrastructure and aquaculture installations. The ecological effects of such structures on the natural surroundings remains largely unclear. 36 tetrapod structures (4-footed concrete breakwaters each weighing 2.8 t) in groups of six were added to the MarGate underwater experimental (see figure 1 in metadata description) area to the north of Helgoland, in the Southern North Sea, in 2009 at 5 and 10 m water depth. The 5 m fields TN5 (North), TM5 (Middle) and TS5 (South) have been monitored monthly, since their introduction, with respect to the abundance, species composition and size of the associated biota community. By carrying out this monitoring project, we aim to study the long-term effects of artificial structures on the local biotic community in shallow coastal ecosystems. Line transect based visual fish census conducted by trained scientific divers is used to survey the fish communities in the vicinity of each tetrapod field. Data collection is communicated by the diver via voice communication of the surface and noted directly in the standardized protocol together with metadata on algae coverage other environmental parameters. Further details regarding the sampling design can be found in the metadata section "Survey Design and Sampling Methodology". Survey Design and Sampling Methodology At each tetrapod field (TN5, TM5, and TS5), four permanent 20-meter transect lines were established in the cardinal directions (figure 1): North (N), East (O), South (S), and West (W). Each transect was marked at intervals of 0, 5, 10, 15, and 20 meters from the respective outer edge of the tetrapod field. At each of these five counting stations along the transects, fish were surveyed within a 2 m² area — 1 m² to the left and 1 m² to the right of the transect line — totaling 10 m² per transect and 40 m² per field. For each observation, the following data were recorded: • Species identity, • Total number of individuals (abundance), • Individual total length (in cm). This standardized method resulted in a total surveyed area of 120 m² per counting event: • 3 tetrapod fields × 4 transect lines × 5 stations × 2 m² per station = 120 m².
Die EU-Meeresstrategie-Rahmenrichtlinie (MSRL) und die EU-Wasserrahmenrichtlinie (WRRL) erfordern die Erreichung bzw. Erhaltung des guten Umweltzustands von Nord- und Ostsee. Grundsätzlich wird davon ausgegangen, dass ein effektiver Meeresschutz einen wichtigen Beitrag zum Klimaschutz leistet. Dahinter steckt die Annahme, dass gesunde Küsten- und Meeresökosysteme mehr Kohlendioxid und Nährstoffe speichern können als anthropogen beeinträchtige Systeme. So führt z.B. die Eutrophierung zu vermehrtem Algenwachstum und einer Trübung des Wassers, die die Ausbreitung von Seegraswiesen beeinträchtigt, die größere Mengen an Kohlenstoff speichern. Andere Zusammenhänge sind weniger gut erforscht. So könnte es z.B. durch die Reduktion der Nährstoffeinträge und des in Folge abnehmenden Algenwachstums zu einer Reduktion des Transports von Kohlenstoff in die Meeressedimente kommen. Der gute Umweltzustand gemäß MSRL und der gute ökologische/ chemische Zustand gemäß WRRL sind anhand ausgewählter Indikatoren und ihrer Schwellenwerte klar definiert. Ziel des Vorhabens ist es, das Kohlenstoffs- und Nährstoffspeicherpotential im gegenwärtigen Zustand und im guten Umweltzustand auf der Basis von Monitoringdaten und Literaturstudien zu quantifizieren und zu vergleichen. Dies soll an ausgewählten, gut untersuchten Modellgebieten jeweils in den Küsten- und Meeresgewässern und in Nord- und Ostsee erfolgen. Der Fokus liegt zunächst auf der Eutrophierung, es sollen aber soweit auf der Basis der Datenlage möglich auch andere relevante Belastungen wie Schadstoffe und Baggergutentnahme untersucht werden. Auf der Basis der Untersuchungen der Modellgebiete soll eine Prognose des Kohlenstoffs- und des Nährstoffspeicherpotenzials für die gesamte Nord- und Ostsee im aktuellen und im guten Umweltzustand erarbeitet werden. Das Vorhaben soll darüber hinaus Empfehlungen erarbeiten, durch welche Maßnahmen sich das Kohlenstoffspeicherpotential von Nord- und Ostsee weiter stärken lässt.
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