Chromosomal status of the parthenogenetic earthworm Dendrobaena octaedra (Sav.) (Oligochaeta: Lumbricidae) in southern Finland
نویسندگان
چکیده
منابع مشابه
Dual roles of glucose in the freeze-tolerant earthworm Dendrobaena octaedra: cryoprotection and fuel for metabolism.
Ectothermic animals inhabiting the subarctic and temperate regions have evolved strategies to deal with periods of continuous frost during winter. The earthworm Dendrobaena octaedra is freeze tolerant and accumulates large concentrations of glucose upon freezing. The present study investigates the roles of glucose accumulation for long-term freeze tolerance in worms kept frozen at -2 degrees C ...
متن کاملVariation in gene expression within clones of the earthworm Dendrobaena octaedra
Gene expression is highly plastic, which can help organisms to both acclimate and adapt to changing environments. Possible variation in gene expression among individuals with the same genotype (among clones) is not widely considered, even though it could impact the results of studies that focus on gene expression phenotypes, for example studies using clonal lines. We examined the extent of with...
متن کاملStress synergy between environmentally realistic levels of copper and frost in the earthworm Dendrobaena octaedra.
In their natural habitat, animals are exposed to a variety of stress factors, including extreme temperatures, low water availability, and toxic stress from chemical pollutants. In this study we examined the interaction between realistic environmental levels of soil-copper contamination and realistic winter temperatures on survival of the cosmopolitan freeze-tolerant earthworm Dendrobaena octaed...
متن کاملSlow desiccation improves dehydration tolerance and accumulation of compatible osmolytes in earthworm cocoons (Dendrobaena octaedra Savigny).
The earthworm, Dendrobaena octaedra, is a common species in temperate and subarctic regions of the northern hemisphere. The egg capsules ('cocoons') of D. octaedra are deposited in the upper soil layers where they may be exposed to desiccation. Many previous studies on desiccation tolerance in soil invertebrates have examined acute exposure to harsh desiccating conditions, however, these animal...
متن کاملInteractions between climatic and toxic stress – Studies with the freeze tolerant earthworm Dendrobaena octaedra
In traditional ecotoxicological studies, test organisms are usually exposed to a single chemical at increasing concentrations, performed under otherwise optimal conditions. However, in natural environments it is very likely that these organisms will also be exposed to other stressful factors, including climatic stressors as frost and drought. This means that traditional laboratory tests may und...
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ژورنال
عنوان ژورنال: Hereditas
سال: 2008
ISSN: 0018-0661
DOI: 10.1111/j.1601-5223.1989.tb00440.x