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  • 1
    Publication Date: 2024-04-20
    Description: The presented data shows the results of suitability analyses to assess potential restoration grounds for ostrea edulis in the German Bight's marine protected areas (MPA) Borkum Reef Ground and Sylt Outer Reef. We made use of existing marine data from various sources and applied a spatial multicriteria decision analysis (MCDA). Spatial input variables are scored uniformly in order to express their respective ability to improve restoration preconditions. They are summed in a linear combination using expert's judgements founded weights using the analytical hierarchy process (AHP) algorithm. Datasets which describe circumstances to prevent a successful restoration are subtracted from the resulting suitable area. The dataset presented here includes the resulting raster datasets as described in out publication. Detailed metadata on the original raw data (not included here) are listed in Table 1 of the publication. The Analysis was performed in 2021 and modified in 2022.
    Keywords: AHP; Coastal; Ecological restoration; ecosystem service; File content; invertebrates; Marine Protected Area (MPA); MCDA; MULT; multicriteria decision analysis; Multiple investigations; Ostrea_edulis_German_Bight_MPA; Ostrea edulis; Oyster; Raster graphic, GeoTIFF format; reef; Restoration of the European oyster (Ostrea edulis) in the German North Sea: Development and practical testing of methods and approaches for a sustainable population recovery; RESTORE
    Type: Dataset
    Format: text/tab-separated-values, 6 data points
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  • 2
    Publication Date: 2023-02-08
    Description: Understanding the distribution and structure of biotopes is essential for marine conservation according to international legislation, such as the European Marine Strategy Framework Directive (MSFD). The biotope 'Sea Pen and Burrowing Megafuna Communities' is included in the OSPAR list of threatened and/or declining habitats. Accordingly, the MSFD prescribes a monitoring of this biotope by the member states of the EU. In the German North Sea, however, the distribution and spatial extent of this biotope as well as the structuring of its benthic species inventory is unknown. We used an extensive geo-referenced dataset on occurrence, abundance and biomass of the benthic infauna of the south-eastern North Sea to estimate the distribution of the biotope and to characterize the associated infauna assemblages. Sediment preferences of the burrowing megafauna, comprising decapod crustaceans and echiurids, were identified and the core distribution areas of the burrowing megafauna were modelled using Random Forests. Clusters of benthic infauna inside the core distribution areas were identified by fuzzy clustering. The burrowing megafauna occurred on a wide range of sediments with varying mud contents. The core distribution area of the burrowing megafauna was characterized by elevated mud content and a water depth of 25-55 m. The analysis of the benthic communities and their relation to sedimentological conditions identified four infauna clusters of slightly varying species composition. The biotope type 'Sea Pen and Burrowing Megafuna Communities' is primarily located inside the paleo valley of the river Elbe and covers an area of 4980 km2. Dedicated monitoring will have to take into account the spatial extent and the structural variability of the biotope. Our results can provide a baseline for the evaluation of the future development of the environmental status of the biotope. The maps generated herein will facilitate the communication of information relevant for environmental management to authorities and policy makers.
    Type: Article , PeerReviewed
    Format: text
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  • 3
    Publication Date: 2017-12-11
    Description: The concept of the marine ecological community has recently experienced renewed attention, mainly owing to a shift in conservation policies from targeting single and specific objec- tives (e.g. species) towards more integrated approaches. Despite the value of communities as dis- tinct entities, e.g. for conservation purposes, there is still an ongoing debate on the nature of spe- cies associations. They are seen either as communities, cohesive units of non-randomly associated and interacting members, or as assemblages, groups of species that are randomly associated. We investigated such dualism using fuzzy logic applied to a large dataset in the German Bight (south- eastern North Sea). Fuzzy logic provides the flexibility needed to describe complex patterns of natural systems. Assigning objects to more than one class, it enables the depiction of transitions, avoiding the rigid division into communities or assemblages. Therefore we identified areas with either structured or random species associations and mapped boundaries between communities or assemblages in this more natural way. We then described the impact of the chosen sampling design on the community identification. Four communities, their core areas and probability of occurrence were identified in the German Bight: AMPHIURA-FILIFORMIS, BATHYPOREIA-TELLINA, GONIADELLA-SPISULA, and PHORONIS. They were assessed by estimating overlap and compactness and supported by analysis of beta-diversity. Overall, 62% of the study area was characterized by high species turnover and instability. These areas are very relevant for conservation issues, but become undetectable when studies choose sampling designs with little information or at small spatial scales.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 4
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    ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
    In:  EPIC3Journal of Environmental Management, ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 255, pp. 109876, ISSN: 0301-4797
    Publication Date: 2019-11-28
    Description: Understanding the distribution and structure of biotopes is essential for marine conservation according to international legislation, such as the European Marine Strategy Framework Directive (MSFD). The biotope ‘Sea Pen and Burrowing Megafuna Communities’ is included in the OSPAR list of threatened and/or declining habitats. Accordingly, the MSFD prescribes a monitoring of this biotope by the member states of the EU. In the German North Sea, however, the distribution and spatial extent of this biotope as well as the structuring of its benthic species inventory is unknown. We used an extensive geo-referenced dataset on occurrence, abundance and biomass of the benthic infauna of the south-eastern North Sea to estimate the distribution of the biotope and to characterize the associated infauna assemblages. Sediment preferences of the burrowing megafauna, comprising decapod crustaceans and echiurids, were identified and the core distribution areas of the burrowing megafauna were modelled using Random Forests. Clusters of benthic infauna inside the core distribution areas were identified by fuzzy clustering. The burrowing megafauna occurred on a wide range of sediments with varying mud contents. The core distribution area of the burrowing megafauna was characterized by elevated mud content and a water depth of 25–55 m. The analysis of the benthic communities and their relation to sedimentological conditions identified four infauna clusters of slightly varying species composition. The biotope type ‘Sea Pen and Burrowing Megafuna Communities’ is primarily located inside the paleo valley of the river Elbe and covers an area of 4980 km2. Dedicated monitoring will have to take into account the spatial extent and the structural variability of the biotope. Our results can provide a baseline for the evaluation of the future development of the environmental status of the biotope. The maps generated herein will facilitate the communication of information relevant for environmental management to authorities and policy makers.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 5
    Publication Date: 2020-12-10
    Description: The glacier retreat observed during the last decades at Potter Cove (PC) causes an increasing amount of suspended particulate matter (SPM) in the water column, which has a high impact on sessile filter feeder’ species at PC located at the West Antarctic Peninsula. SPM presents a highly-fluctuating dynamic pattern on a daily, monthly, seasonal, and interannual basis. Geostatistical interpolation techniques are widely used by default to generate reliable spatial information and thereby to improve the ecological understanding of environmental variables, which is often fundamental for guiding decision-makers and scientists. In this study, we compared the results of default and configured settings of three geostatistical algorithms (Simple Kriging, Ordinary Kriging, and Empirical Bayesian) and developed a performance index. In order to interpolate SPM data from the summer season 2010/2011 at PC, the best performance was obtained with Empirical Bayesian Kriging (Standard mean = -0.001 and Root mean square standardized = 0.995). It showed an excellent performance (Performance Index = 0.004) improving both evaluation parameters when radio and neighbourhood were configured. About 69% of the models showed improved standard means when configured compared to the default settings following a here proposed guideline.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
    Format: application/pdf
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  • 6
    Publication Date: 2021-03-29
    Description: Die quantitative Landschaftsökologie beschäftigt sich mit der räumlichen Abgrenzung von Landschaftsstrukturen auf unterschiedlichen räumlichen Skalen sowie mit den dort beobachtbaren Wechselwirkungen zwischen der belebten und unbelebten Umwelt. Obwohl die Landschaftsökologie in ihrem Ursprung eine terrestrisch orientierte Fachdisziplin ist, sollten deren Methoden auch auf den aquatischen Bereich übertragbar sein, denn auch hier existieren in Abhängigkeit der topografischen, hydrografischen und sedimentologischen Voraussetzungen in sich homogene Lebensraumstrukturen, die man als Landschaften auffassen kann. Ein sich entwickelnder Bedarf an geeigneten planerischen Methoden und Konzepten im marinen Umweltmonitoring ergibt sich aus aktuellem Anlass: Am 17. Juni 2008 wurde die Meeresstrategie-Rahmenrichtlinie (MSRL) durch Beschluss des Europäischen Parlaments und des Rates in der Europäischen Union eingeführt. Die MSRL zielt auf eine umweltgerechte Bewirtschaftung der Meere ab und strebt die Erlangung eines Guten Umweltzustands in den europäischen Meeren bis 2020 an. Mit der Richtlinie erhöhen sich die Anforderungen an die Planung und Überwachung des Zustands der marinen Gewässer in Europa. Neben einer Anfangsbewertung der Meeresgebiete der Mitgliedsstaaten sowie der darauf aufbauenden Festlegung des Guten Umweltzustands anhand abiotischer und biotischer Merkmale und von Umweltzielen sollen auch Maßnahmen zur Erreichung dieser Ziele umgesetzt werden. Der Erfolg dieser Maßnahmen soll durch eine Überwachung des Zustands der Meeresgebiete begleitet werden. Entsprechende Monitoring-Programme sollen eine laufende Bewertung des Umweltzustands anhand chemisch-physikalischer und biologischer Merkmale zulassen. Im Hinblick auf die Planung landschaftsökologisch repräsentativer, auf die Optimierung von Suffizienz- und Effizienzkriterien ausgerichteter Umweltmessnetze in der deutschen Nordsee widmet sich vorliegende Habilitationsschrift der Überprüfung der Übertragbarkeit zweier Methoden der quantitativen Landschaftsökologie in den marinen Raum am Beispiel der deutschen Nordsee. Neben der datenbasierten Ableitung landschaftsökologischer Raumgliederungen für den erweiterten Bereich der deutschen Nordsee mittels statistischer Methoden steht dabei die für die Erfassung des Landschaftshaushalts landschaftsökologisch repräsentative Planung stoffbezogener Umweltmessnetze im Mittelpunkt.
    Description: Quantitative landscape ecology is concerned with the regional classification of landscape structures on various spatial scales, including the here observed interactions between the biological and abiotic environment. Despite the fact that landscape ecology has originally been a terrestrial research field, its methods should be applicable to the aquatic environment. Depending on the prevailing topographical, hydrographical, and sedimentological conditions, homogeneous benthic habitat structures, which we may be referred to as landscapes, do exist here as well. A developing demand for adequate planning methods and concepts in the field of marine environmental monitoring ensues in the light of current events. On July 17, 2008 the Marine Strategy Framework Directive (MSFD) was introduced by a resolution of the European Parliament and the Council of the European Union. The MSFD is targeted on an environmentally sound management of European oceans and aims at achieving a Good Environmental Status (GES) for European marine waters by the year 2020. The directive increases marine planning requirements with respect to monitoring the condition of marine waters in Europe. Apart from an initial assessment of the marine areas of the member states and the ensuing determination of the GES with regard to biotic and abiotic characteristics, as well as the definition of environmental objectives, adequate measures to reach these goals shall also be implemented. The success of these measures is to be accompanied by monitoring activities with regard to the chemical, physical and biological parameters of the marine environment. The question of where to monitor is decided for and discussed within the German Marine Monitoring Programme of the federation and the federal states. Taking the extended area of the German North Sea as an example, the habilitation thesis here submitted focuses on verifying the transferability of two application areas of terrestrial quantitative landscape ecology to the marine environment in order to assist the planning of monitoring networks in Germany’s marine waters. Next to the data-based derivation of landscape ecoregionalizations by means of statistical methods, another focus is set on the landscape-ecologically representative planning of substance based environmental monitoring networks.
    Description: thesis
    Keywords: 551 ; QD 000 ; Physische Geographie / Landschaftsökologie ; Marine Landschaftsökologie ; Biotopkartierung ; Ökogliederung ; Multivariate Statistik ; Geostatistik ; Quantitative Landschaftsökologie
    Language: German
    Type: monograph , draft
    Format: 203 S.
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  • 7
    Publication Date: 2020-11-13
    Description: 1. According to the EU Marine Strategy Framework Directive (2008/56/EC), marine protected areas (MPA) should contribute to a good environmental status of the Europeans seas. Measures maintaining or restoring a favourable conservation status of protected species and habitats are mandatory according to the EU Habitats Directive (92/43/EEC). 2. Identification of suitable sites for ecological restoration measures within MPAs is a crucial step towards successful conservation and sustainable MPA management. In terms of species restoration, it is important to restore the respective species with the best possible environment for growth, survival, fitness, and successful recruitment. 3. This study provides a comprehensive list of site-selection criteria for ecological species restoration. Three general categories were chosen: (1) ecological history: evidence for the historical distribution; (2) feasibility of restoration: regulating framework and logistics; and (3) environmental conditions: quality of abiotic and biotic factors. A total of 16 site-selection criteria were identified and applied to biogenic reef restoration, namely for reefs of the native European oyster Ostrea edulis, in the German Bight. 4. The Natura 2000 area Borkum Reef Ground was identified as a suitable site for oyster restoration. It is one of three MPAs in the German Exclusive Economic Zone of the North Sea, which have been declared as Nature Conservation Areas according to national legislation. The conservation objectives include maintenance or, if necessary, restoration of the habitat type ‘reefs’. As a reef-building species, the European oyster O. edulis is of particular importance for this habitat type in terms of nature conservation.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
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  • 8
    Publication Date: 2022-10-04
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 9
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    ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
    In:  EPIC3Estuarine Coastal and Shelf Science, ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 275, pp. 107996, ISSN: 0272-7714
    Publication Date: 2022-09-15
    Description: Extensive marine benthos surveys have resulted in a solid understanding of the broad distribution pattern of seafloor biotopes in the southeastern North Sea (temperate northeast Atlantic region). However, due to the low spatial resolution of large-scale surveys, specific smaller-scale biotopes with scattered distribution have been insufficiently captured. Consequently, knowledge regarding the environmental characteristics and species inventories of some specific biotopes is still limited. We investigated the habitat characteristics and the macroinfauna (i.e., organisms in samples collected by a sediment grab and retained in a sieve with a mesh size of 1000 μm) of a spatially restricted, patchy coarse sediment (i.e., grain size fraction 〉500 μm accounting for ≥60% of the total sample mass) biotope in the German Bight over three consecutive years. Habitat and faunal characteristics were contrasted with four other benthic biotopes sampled at the same time to allow for a comparative evaluation. Our study revealed considerable fluctuations in grain size distribution among samples of the coarse sediment, potentially resulting from a frequent redistribution of sediments. A total number of 243 infauna taxa were identified at the 66 stations sampled over three consecutive years (16–33 stations per year) with a considerable proportion of endangered and rare species. The results highlight that previous studies have underestimated the species richness of the biotope. The focus on this previously poorly studied biotope type allowed us to detect species in the study region that were formerly unreported. The macro-infauna in the coarse sediments was characterized by comparatively high abundance and biomass, which may provide a rich food resource for organisms from higher trophic levels. Therefore, coarse sediments likely are an ecologically valuable seafloor biotope despite its limited coverage.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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  • 10
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    Springer Science and Business Media LLC
    In:  EPIC3Biodiversity and Conservation, Springer Science and Business Media LLC, 32(8-9), pp. 2747-2768, ISSN: 0960-3115
    Publication Date: 2023-07-20
    Description: Marine sublittoral sandbanks are essential offshore feeding grounds for larger crustaceans, fish and seabirds. In the southern North Sea, sandbanks are characterized by considerable natural sediment dynamics and are subject to chronic bottom trawling. However, except for the Dogger Bank, sandbanks in the southeastern North Sea have been only poorly investigated until now. We used an extensive, multi-annual dataset covering ongoing national monitoring programmes, environmental impact assessments, and basic research studies to analyse benthic communities on sublittoral sandbanks, evaluating their ecological value against the backdrop of similar seafloor habitats in this region. The analysis revealed complex spatial structuring of sandy seafloor habitats of the southeastern North Sea. Different infauna clusters were identified and could be specified by their composition of characteristic species. The sandbanks shared common structural features in their infauna community composition although they were not necessarily characterized by particularly high biodiversity compared to other sandy habitats. A close association of one of the main bioturbators in the southern North Sea, the sea urchin Echinocardium cordatum, with sandbanks was detected, which may promote the sediment-bound biogeochemical activity in this particular seafloor habitat. This would corroborate the status of sandbanks as sites of high ecological value calling for consideration in marine conservation.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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