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  4. Life strategies in the long-lived bivalve Arctica islandica on a latitudinal climate gradient-Environmental constraints and evolutionary adaptations
 
Zitierlink URN
https://nbn-resolving.de/urn:nbn:de:gbv:46-00101989-19

Life strategies in the long-lived bivalve Arctica islandica on a latitudinal climate gradient-Environmental constraints and evolutionary adaptations

Veröffentlichungsdatum
2011-04-29
Autoren
Strahl, Julia  
Betreuer
Abele, Doris  
Gutachter
Abele, Doris  
Zusammenfassung
Arctica islandica reaches maximum life span potentials (MLSP) of 405 and 150 years around Iceland and Helgoland, respectively. The combined effects of a low-metabolic lifestyle, low oxidative damage, constant cellular protection and tissue maintenance, appear to slow-down the physiological aging process in A. islandica. Due to low standard metabolic rates and down-regulation of internal pO2, formation rates of reactive oxygen species (ROS) were low in the clam. Proliferation and apoptosis intensities were low, but constant over 140 years of age. Self-induced burrowing and metabolic rate depression (MRD) seem to be key energy-saving and life-prolonging parameters in A. islandica. During shell closure, mantle cavity water pO2 decreased to 0 kPa for longer than 24 h, while anaerobic metabolism was initially detected after 3.5 days of MRD. A ROS-burst was absent in isolated gills of A. islandica following hypoxia-reoxygenation, antioxidant capacities remained equally high under normoxia and MRD. Local impacts of environmental conditions on behavioral and physiological traits in the clams seem to be responsible for different population-specific MLSPs.
Schlagwörter
Arctica islandica

; 

metabolism

; 

proliferation

; 

apoptosis

; 

antioxidant capacities

; 

aging

; 

metabolic rate depression

; 

burrowing

; 

mantle cavity water pO2

; 

reactive oxygen species formation

; 

nitric oxide

; 

hemocytes
Institution
Universität Bremen  
Fachbereich
Fachbereich 02: Biologie/Chemie (FB 02)  
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

00101989-1.pdf

Size

5.65 MB

Format

Adobe PDF

Checksum

(MD5):7660ddf5a9e00d1b5362cb92b2b20a2a

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