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Datasets of project "Coastal Ecology @ AWI"

Mostrando recursos 1 - 20 de 319

  1. Stickleback F2 generation transgenerational plasticity experiment: egg and body size data

    Shama, Lisa N S; Wegner, K Mathias
    Nongenetic inheritance mechanisms such as transgenerational plasticity (TGP) can buffer populations against rapid environmental change such as ocean warming. Yet, little is known about how long these effects persist and whether they are cumulative over generations. Here, we tested for adaptive TGP in response to simulated ocean warming across parental and grandparental generations of marine sticklebacks. Grandparents were acclimated for two months during reproductive conditioning, whereas parents experienced developmental acclimation, allowing us to compare the fitness consequences of short-term vs. prolonged exposure to elevated temperature across multiple generations. We found that reproductive output of F1 adults was primarily determined by...

  2. Gasterosteus aculeatus body sizes vs. experiment setup after 90 days

    Shama, Lisa N S; Wegner, K Mathias

  3. Gasterosteus aculeatus body sizes vs. experiment setup after 60 days

    Shama, Lisa N S; Wegner, K Mathias

  4. Gasterosteus aculeatus body sizes vs. experiment setup

    Shama, Lisa N S; Wegner, K Mathias

  5. Gasterosteus aculeatus hatching success vs. experiment setup

    Shama, Lisa N S; Wegner, K Mathias

  6. Gasterosteus aculeatus clutch sizes vs. experiment setup

    Shama, Lisa N S; Wegner, K Mathias

  7. Gasterosteus aculeatus egg sizes vs. experiment setup

    Shama, Lisa N S; Wegner, K Mathias

  8. Single beam survey data and links to sea-bottom video files off Helgoland

    Mielck, Finn; Bartsch, Inka; Hass, H Christian; Wölfl, Anne-Cathrin; Bürk, Dietmar; Betzler, Christian G
    Kelp forests represent a major habitat type in coastal waters worldwide and their structure and distribution is predicted to change due to global warming. Despite their ecological and economical importance, there is still a lack of reliable spatial information on their abundance and distribution. In recent years, various hydroacoustic mapping techniques for sublittoral environments evolved. However, in turbid coastal waters, such as off the island of Helgoland (Germany, North Sea), the kelp vegetation is present in shallow water depths normally excluded from hydroacoustic surveys. In this study, single beam survey data consisting of the two seafloor parameters roughness and hardness...

  9. Links to sea-bottom video files along 13 transects off Helgoland

    Mielck, Finn; Bartsch, Inka; Hass, H Christian; Wölfl, Anne-Cathrin; Bürk, Dietmar; Betzler, Christian G

  10. Single beam survey data consisting of the two seafloor parameters roughness and hardness were obtained with the acoustic ground discrimination system RoxAnn off Helgoland in 2011

    Mielck, Finn; Bartsch, Inka; Hass, H Christian; Wölfl, Anne-Cathrin; Bürk, Dietmar; Betzler, Christian G

  11. Effects of ocean acidification on growth and physiology of Ulva lactuca (Chlorophyta) in a rockpool-scenario, link to supplementary data

    Olischläger, Mark; Bartsch, Inka; Gutow, Lars; Wiencke, Christian
    Rising atmospheric CO2-concentrations will have severe consequences for a variety of biological processes. We investigated the responses of the green alga Ulva lactuca (Linnaeus) to rising CO2-concentrations in a rockpool scenario. U. lactuca was cultured under aeraton with air containing either preindustrial pCO2 (280µatm) or for the end of the 21st century predicted (700µatm) pCO2 for 31 days. We addressed the following question: Will elevated CO2-concentrations affect photosynthesis (net photosynthesis, rETR(max), Fv/Fm, pigment composition) and growth of U. lactuca in rockpools with limited water exchange? Two phases of the experiment were distinguished: In the initial phase (day 1-4) the Seawater...

  12. Crustaceans and fish abundances and species at and around artificially introduced tetrapod fields in the southern North Sea, 2013

    Wehkamp, Stephanie; Fischer, Philipp

  13. Crustaceans and fish abundances and species at and around artificially introduced tetrapod fields in the southern North Sea, 2010-2011

    Wehkamp, Stephanie; Fischer, Philipp
    In the coming decades, artificial defence structures will increase in importance worldwide for the protection of coasts against the impacts of global warming. However, the ecological effects of such structures on the natural surroundings remain unclear. We investigated the impact of experimentally introduced tetrapod fields on the demersal fish community in a hard-bottom area in the southern North Sea. The results indicated a significant decrease in fish abundance in the surrounding area caused by migration effects towards the artificial structures. Diversity (HB) and evenness (E) values exhibited greater variation after the introduction of the tetrapods. Additionally, a distinct increase in...

  14. Crustaceans and fish abundances and species at and around artificially introduced tetrapod fields in the southern North Sea, 2009

    Wehkamp, Stephanie; Fischer, Philipp
    The micro-scale spatial distribution patterns of a demersal fish and decapod crustacean assemblage were assessed in a hard-bottom kelp environment in the southern North Sea. Using quadrats along line transects, we assessed the in situ fish and crustacean abundance in relation to substratum types (rock, cobbles and large pebbles) and the density of algae. Six fish and four crustacean species were abundant, with Ctenolabrus rupestris clearly dominating the fish community and Galathea squamifera dominating the crustacean community. Differences in the substratum types had an even stronger effect on the micro-scale distribution than the density of the dominating algae species. Kelp...

  15. Effects of ocean acidification on different life-cycle stages of the kelp Laminaria hyperborea (Phaeophyceae), link to supplementary data

    Olischläger, Mark; Bartsch, Inka; Gutow, Lars; Wiencke, Christian
    Our objective for this study was to evaluate the influence of preindustrial and expected future atmospheric CO2 concentrations (280 µatm and 700 µatm pCO2, respectively) on different life-cycle stages of the kelp Laminaria hyperborea from Helgoland (Germany, North Sea). Zoospore germination, gametogenesis, vegetative growth, sorus formation and photosynthetic performance of vegetative and fertile tissue were examined. The contribution of external carbonic anhydrase (exCA) to C-supply for net-photosynthesis (net-PS) and the Chla- and phlorotannin content were investigated. Female gametogenesis and vegetative growth of sporophytes were significantly enhanced under the expected future pCO2. rETR(max) and net-PS of young vegetative sporophytes tended to...

  16. Microbiota and Microsatellite genotypes of Pacific oysters stemming from three oyster bed in the Northern Wadden Sea

    Wegner, K Mathias; Volkenborn, Nils; Peter, Hannes; Eiler, Alexander
    Background: Studies of oyster microbiomes have revealed that a limited number of microbes, including pathogens, can dominate microbial communities in host tissues such as gills and gut. Much of the bacterial diversity however remains underexplored and unexplained, although environmental conditions and host genetics have been implicated. We used 454 next generation 16S rRNA amplicon sequencing of individually tagged PCR reactions to explore the diversity of bacterial communities in gill tissue of the invasive Pacific oyster Crassostrea gigas stemming from genetically differentiated beds under ambient outdoor conditions and after a multifaceted disturbance treatment imposing stress on the host. Results: While the...

  17. Operational taxonomic unit table of Pacific oysters stemming from three oyster bed in the Northern Wadden Sea, part 2, OTU 4000-9339

    Wegner, K Mathias; Volkenborn, Nils; Peter, Hannes; Eiler, Alexander

  18. Operational taxonomic unit table of Pacific oysters stemming from three oyster bed in the Northern Wadden Sea, part 1, OTU 1-3999

    Wegner, K Mathias; Volkenborn, Nils; Peter, Hannes; Eiler, Alexander

  19. Microsatellite genotypes of Pacific oysters stemming from three oyster bed in the Northern Wadden Sea

    Wegner, K Mathias; Volkenborn, Nils; Peter, Hannes; Eiler, Alexander

  20. Oceanography and methane of waters from the Lena Delta

    Bussmann, Ingeborg
    The Lena River is one of the largest Russian rivers draining into the Laptev Sea. The permafrost areas surrounding the Lena are predicted to thaw at increasing rates due to global temperature increases. With this thawing, large amounts of carbon - either organic or in the gaseous forms carbon dioxide and methane - will reach the waters of the Lena and the adjacent Buor-Khaya Bay (Laptev Sea). Methane concentrations and the isotopic signal of methane in the waters of the Lena Delta and estuary were monitored from 2008 to 2010. Creeks draining from permafrost soils produced hotspots for methane input...

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