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Dormancy in the Copepoda — an overview

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Abstract

Dormancy affects copepods in their anatomy, physiology, genetics, population biology, community ecology, evolution and local and geographic distribution. It is known from freeliving representatives of three copepod taxa, namely the Harpacticoida, Cyclopoida and Calanoida. Species showing dormancy occur in various realms and habitats, both freshwater and marine, being benthic, planktic or ice-dwelling. Depending on the taxon, dormancy occurs at various times of the year, prevailing in higher and temperate latitudes. Copepod dormancy is expressed in various ontogenetic stages, such as resting eggs, arrested larval development, juvenile and adult encystment, or arrested development of nonencysted copepodids or adults. Ecologically, dormancy is an energy saving trait, allowing the individual to bridge periods of environmental harshness. Adverse environmental conditions could be abiotic (e.g. desiccation, temperature, oxygen availability) or biotic in nature (e.g. food availability, predation). Diapause s. str. is initiated, maintained and terminated by triggering factors (e.g. photoperiod, temperature, chemical cues, population density/physiological factors). The dormant state and emergence patterns directly affect reproduction, population dynamics, community composition, coexistence and distribution of copepods, as well as the phenology of their predators and living food items. Populations having dormancy, in most cases belong to and affect communities of two realms: the water column and the bottom. Dormant stages may provide means for dispersal as well as for staying in special localities. The variability of dormancy permits flexible and complex life histories. Dormancy is subjected to and on the other hand affects copepod evolution.

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    Hans-U. Dahms

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Dahms, HU. Dormancy in the Copepoda — an overview. Hydrobiologia 306, 199–211 (1995). https://doi.org/10.1007/BF00017691

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