Population dynamics of exploited cultures of calanoid copepods
نویسندگان
چکیده
منابع مشابه
Reproductive cycles of dominant calanoid copepods in the North Sea
The seasonal cycles of reproduction of the dominant copepods Acartia clausi, Temora longicornis, Centropages hamatus, C. typicus and Pseudocalanus spp. were studied at Helgoland Roads, southern North Sea. Egg production rate, clutch size, number of spawning females and prosome length were compared with temperature and phytoplankton concentration. Female A. clausi, T. longicornis and Pseudocalan...
متن کاملTemperature cycles affect colonization potential of calanoid copepods.
Marine calanoid copepods colonize new habitats, and some become invasive. Their fitness, measured by intrinsic growth rate and net reproductive rate, is partially driven by biochemical processes. Thus, it is a function of ambient temperature. Biochemical processes may not be approximated well by yearly mean temperature alone when temperature cycles yearly, largely. Higher order moments may also...
متن کاملCalanoid copepods, feeding currents, and the role of gravity.
Feeding currents of free-swimming calanoid copepods, observed through an expanded krypton laser beam and a back-focus dark-field optical system, show that these planktonic animals generate a double shear field to help in detecting food. The interrelation between flow field, perception of food items, and body orientation explains why these animals are generally negatively buoyant.
متن کاملMeningeal-like organization of neural tissues in calanoid copepods (Crustacea).
Meninges, the connective tissue of the vertebrate central nervous system (CNS), have not been recognized in invertebrates. We describe the ultrastructure of the adult brain, antennules, and cord in five marine copepods: Calanus finmarchicus, Gaussia princeps, Bestiolina similis, Labidocera madurae, and Euchaeta rimana. In all of these locations we identified cell types with characteristics of t...
متن کاملChemoreceptors and feeding in calanoid copepods (Arthropoda: Crustacea).
Ultrastructural studies of the mouthparts of the calanoid copepod Diaptomus pallidus have revealed the presence of numerous chemoreceptors, and the apparent absence of mechanoreceptors. The setae contain no muscles, and the setules are noncellular extensions of their chitin wall. This allows a new insight into the selective feeding of zooplankters.
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ژورنال
عنوان ژورنال: Helgoländer Wissenschaftliche Meeresuntersuchungen
سال: 1970
ISSN: 0017-9957,1438-3888
DOI: 10.1007/bf01609913