DC Element | Wert | Sprache |
dc.contributor.author | Hannack, K | |
dc.contributor.author | Kestler, P | |
dc.contributor.author | Sicken, O | |
dc.contributor.author | Westheide, W | |
dc.date.accessioned | 2021-12-23T16:02:46Z | - |
dc.date.available | 2021-12-23T16:02:46Z | - |
dc.date.issued | 1997 | |
dc.identifier.issn | 01743597 | |
dc.identifier.uri | https://osnascholar.ub.uni-osnabrueck.de/handle/unios/5600 | - |
dc.description.abstract | The sea anemone Cereus pedunculatus was artificially UV-irradiated to test the effect of UV-light on the number of endosymbiotic dinoflagellates in its gastrodermis and on their ultrastructure. Anemones were kept in the laboratory in a Light:dark cycle (LD 12:12; 13 W m(-2)) at 18 degrees C and briefly (2, 5 and 9 d) exposed to UV radiation at quasisolar intensities, 0.5 or 1 W m(-2). Their tentacles were then examined in the electron microscope for qualitative and quantitative changes in the zooxanthellae. There was an intensity-dependent decease in the number of symbionts, which in some cases were lost altogether (bleaching). Irradiated anemones contained a larger proportion of symbionts with ultrastructural abnormalities, namely diminished starch, some mitochondria with altered matrix and, in particular, characteristic changes in the chloroplasts; instead of being densely stacked, the thylakoids were spread apart and swollen at the ends of their membranes to form vesicle-like structures. Relatively large Vesicles also appeared in the cytoplasm. The resulting enlargement of the whole dinoflagellate cell was documented morphometrically. Another intensity-dependent effect was a significant decrease in mitosis rate, established by counting dividing symbiont cells in TEM micrographs. | |
dc.language.iso | en | |
dc.publisher | BIOLOGISCHE ANSTALT HELGOLAND | |
dc.relation.ispartof | HELGOLANDER MEERESUNTERSUCHUNGEN | |
dc.subject | B RADIATION | |
dc.subject | FLAGELLATE CRYPTOMONAS | |
dc.subject | Marine & Freshwater Biology | |
dc.subject | Oceanography | |
dc.subject | REEF CORALS | |
dc.subject | SOLAR | |
dc.subject | SP-NOV | |
dc.subject | SYMBIOTIC CNIDARIANS | |
dc.subject | TEMPERATURE | |
dc.subject | ULTRAVIOLET-RADIATION | |
dc.subject | WATER | |
dc.subject | ZOOXANTHELLAE | |
dc.title | The influence of UV radiation on number and ultrastructure of the endosymbiotic dinoflagellates in the sea anemone Cereus pedunculatus (Anthozoa : Actiniaria) | |
dc.type | journal article | |
dc.identifier.isi | ISI:000073992900007 | |
dc.description.volume | 51 | |
dc.description.issue | 4 | |
dc.description.startpage | 487 | |
dc.description.endpage | 502 | |
dc.publisher.place | BIBLIOTHEK COLUMBUSSTR, D-27568 BREMERHAVEN, GERMANY | |
dcterms.isPartOf.abbreviation | Helgol. Meeresunters. | |