رسالة جامعية
Metabolic and Oxidative Stress Responses of Cassiopea sp. to Environmental Stress : Towards a Better Physiological Understanding of Jellyfish's Tolerance ; Metabolischer und oxidativer Stress Reaktionen von Cassiopea sp. zu Umweltstress : Auf dem Weg zu einem besseren physiologischen Verständnis der Toleranz der Qualle
| العنوان: | Metabolic and Oxidative Stress Responses of Cassiopea sp. to Environmental Stress : Towards a Better Physiological Understanding of Jellyfish's Tolerance ; Metabolischer und oxidativer Stress Reaktionen von Cassiopea sp. zu Umweltstress : Auf dem Weg zu einem besseren physiologischen Verständnis der Toleranz der Qualle |
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| المؤلفون: | Aljbour, Samir |
| المساهمون: | Zimmer, Martin, Kunzmann, Andreas |
| بيانات النشر: | Universität Bremen FB2 Biologie/Chemie |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | Cassiopea, jellyfish, cellular respiration, oxidative stress, jellyfish tolerance, lactate dehydrogenase, pyruvate kinase, Gulf of Aqaba, jellyfish bloom, electron transport system, superoxide dismutase, 570 Life sciences, biology, ddc:570, envir, geo |
| الوقت: | 570 |
| الوصف: | Jellyfish are commonly seen as robust, noxious and unwelcoming animals. In recent decades, reports concerning jellyfish outbreaks and invasions are increasing worldwide. Regardless of the debate about the underlying drivers of jellyfish blooms, climate change and anthropogenic activities are commonly perceived as the main drivers. There is, however, scarcity of strong evidences to support this perception, because only few manipulative experiments have addressed the physiological responses of jellies to varying environmental stressors. The overall aim of this thesis is to use manipulative experiments and field excursions to test hypotheses about tolerance of jellyfish to stressors associated with climate change and anthropogenic activities for better prediction of their fate in the future. Due to climate change, extreme weather conditions are becoming more frequent and severe. In chapters 2 and 3, I investigate the metabolic and oxidative responses of the upside-down jellyfish Cassiopea sp. (Cassiopea hereafter) medusae to sudden changes in seawater temperature (i.e., either rise or drop by 6 AdegreeC from the control temperature). Medusae responded in contrasting manners to drop and rise in seawater temperature. While medusae treated at low temperature (20 AdegreeC) looked unhealthy and showed signs of decreased physiological performance (i.e., in term of decreased body mass and size) after two weeks, medusae treated at high temperature (32 AdegreeC) gained in body mass and size, indicating an enhanced performance for the same period. At the cellular level, medusae treated at low temperature suffered from oxidative stress-induced cellular damage and elevated metabolic demand, while no oxidative stress or signs of increased energy demand were evident in medusae at higher temperature. The overall results of these two chapters suggest that Cassiopea medusae are more tolerant to temperature rise than drop. They might benefit from global warming to spread and expand their populations in the future as well. Coastal . |
| نوع الوثيقة: | thesis |
| اللغة: | English |
| العلاقة: | https://media.suub.uni-bremen.de/handle/elib/1350Test |
| الإتاحة: | https://media.suub.uni-bremen.de/handle/elib/1350Test |
| حقوق: | undefined |
| رقم الانضمام: | edsbas.3CC12D67 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |