Licht-im-Terrarium: Literaturdatenbank
Licht-im-Terrarium: Literaturdatenbank |
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Reguera, S., Zamora-Camacho, F. J., Melero, E., García-Mesa, S., Trenzado, C. E., & Cabrerizo, M. J., et al. (2014). Ultraviolet radiation does not increase oxidative stress in the lizard psammodromus algirus along an elevational gradient. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, Added by: Sarina (2014-12-27 17:57:59) |
| Resource type: Journal Article DOI: http://dx.doi.org/10.1016/j.cbpa.2014.12.015 ID no. (ISBN etc.): 1095-6433 BibTeX citation key: Reguera2014 View all bibliographic details  |
Categories: Englisch = English Keywords: Echsen = Lizards, Thermoregulation = Thermoregulation, Ultraviolett = Ultraviolet Creators: Cabrerizo, García-Mesa, Melero, Moreno-Rueda, Reguera, Sanz, Trenzado, Zamora-Camacho Collection: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology |
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Meine Sichtweise (Keine vollständige Zusammenfassung des Artikels! Meine Meinung muss nicht mit der Meinung der Autoren übereinstimmen! Bitte lesen Sie auch die Originalarbeit!)
ZusammenfassungAlgerische Sandläufer wurden im Sierra Nevada Gebirge in Spanien im Frühsommer aus sechs Populationen aus drei Lebensräumen (in einer Höhe zwischen 300 m und 2500 m über dem Meeresspiegel) gefangen. In den höher gelegenen Habitaten betrug die UVB-Bestrahlungsstärke mittags 4,80 µW/cm², in den tiefer gelegenen Habitaten 1,28 µW/cm². Die Tiere wurden 4 Tage lang einzeln gehalten anschließend wurden die Hälfte der Tiere aus jeder der drei Habitatgruppen für fünf Stunden unter eine UVB-Lampe gesetzt (Repti Glo 10.0 compact, 30cm Abstand, 1,94 µW/cm² UVB). Die andere Hälfte der Gruppe wurde nur mit weißem Licht bestrahlt. Untersucht wurde anschließend, ob Schäden durch die UV-Strahlung aufgetreten sind. Einerseits direkte Hautschäden aber auch verschiedene Parameter im Blut der Tiere, die auf Schäden hinweisen. Added by: Sarina |
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Abstract Lizards, as ectotherms, spend much time basking for thermoregulating exposed to solar radiation. Consequently, they are subjected to ultraviolet radiation (UVR), which is the most harmful component of solar radiation spectrum. {UVR} can provoke several types of damage, from the molecular to tissue level, and can even cause death. Photooxidation triggered by {UVR} produces reactive oxidative species (ROS). When antioxidant machinery cannot combat the {ROS} concentration, oxidative stress occurs in the organisms. Given that {UVR} increases with elevation, we hypothesised that lizards from high elevations should be better adapted against {UVR} than lizards from lower elevations. In this work, we test this hypothesis in Psammodromus algirus along an elevation gradient (three elevational belts, from 300 to 2500 m above sea level). We ran an experiment in which lizards from each elevation belt were exposed to 5-hour doses of {UVR} (UV-light bulb, experimental group) or photosynthetically active radiation (white-light bulb, control group) and, 24 h after the exposure, we took tissue samples from the tail. We measured oxidative damage (lipid and protein peroxidation) and antioxidant capacity as oxidative-stress biomarkers. We found no differences in oxidative stress between treatments. However, consistent with a previous work, less oxidative damage appeared in lizards from the highlands. We conclude that {UVR} is not a stressor agent for P. algirus; however, our findings suggest that the lowland environment is more oxidative for lizards. Therefore, P. algirus is well adapted to inhabit a large elevation range, and this would presumably favour the lizard in case it ascends in response to global climate change.
Added by: Sarina |