Framework-building cold-water coral ecosystem characterisation [Elektronische Ressource] : key studies from macro- to micro-scale / vorgelegt von Lydia Beuck

Lydia Beuck

Informations

• Publié par: friedrich-alexander-universitat_erlangen-nurnberg
• Publié le: 01 janvier 2008
• Nombre de lectures: 30
• Langue: English
• Poids de l'ouvrage: 18 Mo

Extrait

Framework-building cold-water coral ecosystem
characterisation:
Key studies from macro- to micro-scale
Der Naturwissenschaftlichen Fakultät
der Friedrich-Alexander Universität
Erlangen-Nürnberg
zur
Erlangung des Doktorgrades
vorgelegt von
Lydia Beuck
aus
Bad SegebergAls Dissertation genehmigt von der
Naturwissenschaftlichen Fakultät
der Friedrich-Alexander Universität
Erlangen-Nürnberg
Tag der mündlichen Prüfung: 15.08.2008
Vorsitzender der Promotionskommission: Prof. Dr. Eberhard Bänsch
Erstberichterstatter: Prof. Dr. A. Freiwald
Zweitberichterstatter: Prof. Dr. R. HöflingContent
Content
Acknowledgements....................................................................................................................V-VII
Zusammenfassung..................................................................................................................IX-XIV
Summary....................................................................................................................................XV-XIX
Chapter 1 General introduction.......................................................................................................................1-7

Framework-building cold-water corals.....................................................................................................2
coral ecosystems....................................................................................5
Aim of study.............................................................................................................................................6
Chapter 2 Cold-water corals as habitat-forming substrate.....................................................................8-129

2.1 Habitat mapping of the Franken Mound (NE Atlantic).................................................................9-28
Introduction.................................................................................................................9
Geographical setting........................................................................................................9
Material and methods.................................................................................................................11
Bathymetric mapping....................................................................................................11
OFOS and ROV video surveys........................................................................................11
Video analysis................................................................................................................12
Results...........................................................................................................................12
Classification scheme....................................................................................................12
Facies characterisation..................................................................................................17
Biocoenosis characterisation.........................................................................................21
External features............................................................................................................25
Discussion.................................................................................................................26
Coral distribution vs. oceanographic conditions........................................................26
Mound development......................................................................................................27
Biodiversity............................................................................................................28
2.2 Long-term observations of a deep-water coral thicket (Galway Mound, NE Atlantic):
characterisation of currents, facies and biocoenosis............................................................29-47
Introduction................................................................................................................29
Geographical setting......................................................................................................29
Material and methods.................................................................................................................31
CTD system...................................................................................................................31
Current metres...............................................................................................................32Content
Image analysis..............................................................................................................32
Results...........................................................................................................................32
Characterisation of currents..........................................................................................34
Translocation events.....................................................................................................35
of facies..............................................................................................36
Feeding behaviour of corals..........................................................................................38
Spatiotemporal analyses of vagile organisms..............................................................42
Discussion.................................................................................................................45
Influence of currents on the coral ecosystem...............................................................45
Feeding behaviour of corals..........................................................................................46
Spatiotemporal analyses of vagile organisms..............................................................46
2.3 Biodegradation processes of cold-water corals.......................................................................49-119
2.3.1 Bioerosion patterns in deep-water coral thickets from the northern Atlantic and
Mediterranean Sea...................................................................................................49-75
Introduction..................................................................................................49
Mineralogy.......................................................................................50
Scope of this study..........................................................................................51
Settings................................................................................................51
Materials.................................................................................................................52
Propeller Mound..............................................................................................52
Leuca Mound Province ..................................................................................52
Methodology................................................................................................................53
Vacuum cast-embedding technique..................................................................53
Thin sections....................................................................................................54
Results and interpretation..............................................................................................54
Propeller Mound..............................................................................................54
Leuca Mound Province....................................................................................63
Excursus 1: Where Topsent went wrong: Aka infesta a.k.a. Aka labyrinthica
(Demospongiae, Phloeodictyidae) and implications for other Aka spp. .......75-93
Introduction.............................................................................................75
Material and methods......................................................................................76
Systematics................................................................................79
Material examined..............................................................................79
Diagnosis for Aka infesta.....................................................................79
Description of Aka infesta from the Ionian Sea specimen
ZMA POR 19972...................................................................81
Results and discussion..................................................................................................83
Biometric comparisons of spicule characters of Aka spp. .............................83
2.3.2 Bioerosion patterns in shallow-water Desmophyllum dianthus (Scleractinia) from Chile:
characteristics of the biocoenosis, the bioeroding community, heterotrophic
interactions and (palaeo)-bathymetric implications............................................94-119Content
Introduction.............................................................................................................94
Overview of the Chilean fjord region................................................................94
Distribution of shallow-water Desmop