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  • 1
    Electronic Resource
    Electronic Resource
    Monitoring the Wadden Sea — an introduction (1989)
    Springer
    Helgoland marine research 43 (1989), S. 259-262 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Wadden Sea is an ecotone of far-reaching importance. Its nature is continuously changing, and ecological monitoring is needed to identify and analyse trends, and to inform the general public about accelerated change caused by human impact. Sustained ecological research with a diversified monitoring program is essential to overcome the ‘immature phase’ of short-term and single-site studies in ecological science. Long-term and wide-scale phenomena are of increasing relevance to human welfare. Ecological monitoring includes retrospective and ongoing recordings of physical, chemical and biological parameters on a regional scale. It improves our understanding of natural patterns and processes, and of the distortions caused by man. It may provide early warnings. It is a necessary precondition for translating the principle of anticipatory action into practical policy, and it also documents the effects of actions taken. Monitoring the Wadden Sea will help to protect its great variety of flora and fauna, and will also prevent it from deteriorating into a gray coastal backwater, serving for utility purposes only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02365887
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Historical changes in the benthos of the Wadden Sea around the island of Sylt in the North Sea (1989)
    Springer
    Helgoland marine research 43 (1989), S. 417-433 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The situation regarding the distribution and abundance of seagrass, macroalgae and benthic fauna near the island of Sylt in the south-eastern North Sea during the period 1923 to 1940 is compared with that of the 1980s. Evidence of organic enrichment in recent times is provided by (1) massive growth of green algal mats on sheltered tidal flats, (2) a decline of red algae in the subtidal zone, (3) an expansion of mussel beds along low water line and down to 20 m depth, (4) increased abundance of polychaetes inhabiting intertidal and subtidal sandy bottoms. Seagrass beds have undergone complex changes which remain unexplained. Intensified erosion has contributed to the loss of habitats in the intertidal zone, and probably affected sessile epifauna in the deep channels. Here, direct removal and disturbance by the bottom-trawling fishery may also have contributed to the observed species impoverishment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02365901
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Sewage, green algal mats anchored by lugworms, and the effects on Turbellaria and small Polychaeta (1983)
    Springer
    Helgoland marine research 36 (1983), S. 151-162 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract On sandy tidal flats at the Island of Sylt (North Sea) ephemeral mats of green algae covered wide areas in the vicinity of sewage outflows. Algae became anchored in the feeding funnels of lugworms (Arenicola marina) and thus were able to resist displacement by tidal currents. Below the algal mats anoxic conditions extend to the sediment surface. After about one month a rough sea removed all algae. Polychaetes endured this short-term environmental deterioration, while the more sensitive Turbellaria decreased in abundance and species richness. Diatom-feeders were affected most, predators to a medium extent, and bacteria-feeders the least affected. Rare and very abundant species were more affected than moderately abundant ones. None of the turbellarian species increased in abundance and none colonized the algal mats above the sediment. In a semicontrolled experiment with daily hand-removal of drift algae from a 100-m2 plot within an extensive field of algal mats, this cleaned "island" served as a refuge to Turbellaria escaping from their algal covered habitat. Here abundance doubled relative to initial conditions and was 5-times higher than below algal mats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01983854
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental sediment disturbances on a tidal flat: Responses of free-living Platyhelminthes and small Polychaeta (1984)
    Springer
    Hydrobiologia 118 (1984), S. 73-81 
    Details
    ISSN: 1573-5117
    Keywords: meiofauna ; Wadden Sea ; sand flat ; disturbance ; recolonization ; Turbellaria ; Polychaeta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Small-scale sediment disturbances on a sandy tidal flat in the North Sea changed the pattern of abundances in free-living platyhelminths (Turbellaria) and small Polychaeta, but not the species composition. Patches of 0.25 m2 were made anoxic, were regularly raked at the surface, or the upper layer of sediment was inverted. Recolonization after temporary anoxia proceeded very slowly. Raking caused diatom-feeding platyhelminths and the polychaetes to emigrate. Turning the upper 5 cm of the sediment upside down was harmful to both taxa, but platyhelminths recolonized quickly. Background densities were temporarily surpassed, first by predators, then by diatom feeders. Coherent responses of trophic guilds in platyhelminths do not suggest that release from competition is involved but indicate that such disturbances alter the availability of food resources and the organisms immigrate accordingly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00031790
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Exoten der Nordsee (1999)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 29 (1999), S. 286-291 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Kein Schiff überquert sden Ozean ganz ohne blinde passagiere. Muscheln undAsseln bohren sich in Holzplanken. Algen und Seepocken heften sich mi Unterwasserbereich an die Schiffsrümpfe. Planktische sporen und Larven gelangen in das Ballastwasser, das jedes moderne Schiff zur Stabilisierung mit sich führt ‘1 und 3’. Je größer und schneller ein Schiff ist, desto, besser ist dies für die unbeachteten Tramper der Weltmeere. Wer solch eine lange Seereise überlebt, ist auch widerstands- und anpassungsfähig genug, um sich an neuen Küsten zurechtzufinden (Abbildung 2). Günstige Gelegenheiten zur Mitreise ergeben sich auch, wenn Austern oder andere Meerestiere für die Weiterzucht an ferne Küsten versandt werden. Solch ein Handel hat weltweit zugenommen, ebenso wie der interkontinentale Schffsverkehr. Diese Entwicklung führte dazu, daß mehr und mehr Arten zu Bewohnern weit voneinander entfernter Küsten wurden. Der mensch half die natürlichen Ausbreitungsbarrieren zu überwinden und leitete eine Globalisierung der Lebensgemeinschaften an den Küsten ein. - Welchen Umfang aber hat dies im Bereich der Nordsee angenommen? - Welche ökologischen Konsequenzen ergeben sich? - Kann und soll dieser Trend aufgehalten werden? - Diese brisanten Fragen stellen sich weltweit für die Meeresküsten und ebenso auch für die Süßwasser und das Land ‘11-13’.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.960290505
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Ökosystem Wattenmeer (1993)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 23 (1993), S. 301-307 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Das Wattenmeer zeigt eine starke natürliche Variabilität. Fallen zusätzliche Änderungen durch Menschenhand da überhaupt ins Gewicht? Wie Können wir den Einfluß des Menschen messen, wenn kein vergleichbarer Naturzustand als Meßlate zur Verfügung steht? Vermutlich als Folge zugenommener Nährstoffeinträge haben sich Grünalgemmatten erstmals im Watt ausgebreitet. Sie wirken wie Warteschleifen im Stoffumstaz des ökosystems und können so andere Veränderungen hinauszögern. Wo sich aber Muschelbänke ausdehnen konnten, wirkt ihr schneller Stoffumsatz wie ein Veränderungsbeschleuniger. Ob Warteschleife oder Beschleunigung, entscheidet sich im Wechselspiel der Organismenarten untereinander. Die ökologie muß versuchen, die Spielregeln zu finden, um Vorhersagen machen zu können.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19930230507
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    Paper (German National Licenses)
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