scholarly journals The neritic marine copepod Centropages typicus does not suffer physiological costs from diel temperature fluctuations associated with its vertical migration

2021 ◽  
Vol 84 (1) ◽  
Author(s):  
Manuel Olivares ◽  
Albert Calbet ◽  
Enric Saiz
Keyword(s):  
Vertical Migration ◽  
Temperature Fluctuations ◽  
Marine Copepod ◽  
Centropages Typicus

Demographic Strategy of Vertical Migration by a Marine Copepod

1974 ◽  
Vol 108 (959) ◽  
pp. 91-102 ◽  
Author(s):  
Ian A. McLaren
Keyword(s):  
Vertical Migration ◽  
Marine Copepod

scholarly journals Dietary polyunsaturated fatty acid supply improves Daphnia performance during vertical migration

2019 ◽  
Author(s):  
Jana Isanta Navarro ◽  
Matthias Fromherz ◽  
Michelle Dietz ◽  
Bettina Zeis ◽  
Anke Schwarzenberger ◽  
...  
Keyword(s):  
Lipid Peroxidation ◽  
Vertical Migration ◽  
Temperature Fluctuations ◽  
Temperature Acclimation ◽  
Trophic Levels ◽  
List Type ◽  
Dietary Pufa ◽  
Pufa Supplementation ◽  
Cold Temperatures ◽  
Cascading Effects

AbstractDiel vertical migration (DVM) is a common predator avoidance strategy of zooplankton. Migration to deeper water layers during the day to escape visually hunting predators most likely requires physiological adaptations to periodically changing temperatures. Polyunsaturated fatty acids (PUFA) are essential nutrients that play crucial roles in membrane temperature acclimation. Exposure to cold temperatures typically results in an increase in the relative abundance of PUFA in cell membranes and PUFA requirements of Daphnia have been shown to increase with decreasing temperatures.To assess the significance of dietary PUFA for coping with temperature fluctuations experienced during DVM, we reared Daphnia magna at either constantly warm or fluctuating temperatures simulating DVM both with and without dietary PUFA supplementation.We show that the well-known positive effect of dietary eicosapentaenoic acid (EPA) supplementation on offspring production and population growth rates of Daphnia is more pronounced at alternating temperatures than at constantly warm temperatures. Exposure to alternating temperatures caused modification in body PUFA concentrations and, consequently, increased lipid peroxidation. However, detrimental effects of lipid peroxidation were not evident.Our data demonstrate that the capacity to cope with the distinct temperature fluctuations experienced during DVM increases with dietary EPA supplementation, suggesting that an adequate dietary PUFA supply is crucial especially for migrating Daphnia populations. A dietary deficiency in long-chain PUFA may thus severely constrain predator evasion, potentially resulting in increased mortality and cascading effects on lower trophic levels.

scholarly journals Effects of water of reduced salinity on the vertical migration of zooplankton

1962 ◽  
Vol 42 (2) ◽  
pp. 131-154 ◽  
Author(s):  
Joan Lance
Keyword(s):  
Vertical Migration ◽  
Developmental Stages ◽  
Marked Effect ◽  
Sea Water ◽  
Acartia Tonsa ◽  
Upward Migration ◽  
Southampton Water ◽  
Water Columns ◽  
Temora Longicornis ◽  
Centropages Typicus

SUMMARYEffects of water of reduced salinity on the vertical migration of the zooplankton of Southampton Water were investigated in the laboratory using the adults of six copepod species (Acartia tonsa, A. bifilosa, A. discaudata, A. clausi, Centropages hamatus, Temora longicornis) and the larvae of one decapod species (Porcellana longicornis). Additional observations were made on Centropages typicus adults taken off Plymouth.Salinity discontinuity layers had a marked effect on the vertical migration of zooplankton. A single discontinuity layer formed by placing less dense diluted sea water over full strength sea water acted as a barrier to animals attempting to swim toward the surface of an experimental water column and no individuals were able to enter the zone of reduced salinity when an extreme dilution was used. Comparison of the behaviour of various species and of different sexes or developmental stages of a particular species suggests that vertical distribution was partly dependent on the salinity tolerances of individuals. Upward migration was also restricted by a vertical series of discontinuity layers.The swimming activity of copepods was depressed in homogeneous water columns of reduced salinity. Activity depended both on the degree of dilution and on the period of immersion. There were indications that behaviour varied according to the salinity tolerances of the different species.

Vertical Migration of Centropages typicus (Copepoda) in Chesapeake Bay, with Some Thoughts on Migration Studies

Estuaries ◽  
1979 ◽  
Vol 2 (1) ◽  
pp. 61 ◽  
Author(s):  
Harris H. White ◽  
Jeff S. Heaton ◽  
Kathleen B. Schmitz
Keyword(s):  
Chesapeake Bay ◽  
Vertical Migration ◽  
Migration Studies ◽  
Centropages Typicus
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