The effect of temperature gradients and stomach fullness on the vertical distribution of larval herring in experimental columns

2011 ◽  
Vol 404 (1-2) ◽  
pp. 26-32 ◽  
Author(s):  
I.A. Catalán ◽  
K.W. Vollset ◽  
B. Morales-Nin ◽  
A. Folkvord
Keyword(s):  
Vertical Distribution ◽  
Temperature Gradients ◽  
Effect Of Temperature ◽  
Stomach Fullness ◽  
The Vertical Distribution

Water temperature, vertical distribution, and risk of ectoparasitism in juvenile sticklebacks

1988 ◽  
Vol 66 (9) ◽  
pp. 2002-2005 ◽  
Author(s):  
Robert Poulin ◽  
Gerard J. FitzGerald
Keyword(s):  
Vertical Distribution ◽  
Water Temperature ◽  
Attack Rate ◽  
Abiotic Factors ◽  
Natural Habitat ◽  
Early Morning ◽  
Effect Of Temperature ◽  
Different Temperatures ◽  
Diel Fluctuations ◽  
The Vertical Distribution

We tested the hypothesis that the risk of juvenile sticklebacks (Gasterosteidae) being parasitized by the crustacean ectoparasite Argulus canadensis decreases with increasing water temperature. In the laboratory, juvenile sticklebacks and parasites were acclimated to three different temperatures, 18, 22, and 26 °C. The attack performances of single parasites on groups of 20 fish were measured at each temperature. We found no significant effect of temperature on the attack success (percentage of attacks successful) or the attack rate (number of attacks per minute) of parasites. In addition, we sampled sticklebacks in their natural habitat, salt marsh tide pools, three times per day, when water temperatures were lowest, intermediate, and highest. The relative abundance of parasites on fish (total number of A. canadensis divided by the total number of sticklebacks sampled) was twice as high during midafternoon, when temperature was highest, than in the early morning, when temperature was lowest. Sticklebacks usually swam close to the bottom of tide pools, where parasites were resting, in midafternoon, and at the water surface in the early morning. These changes in the vertical distribution of the fish may result from diel fluctuations in temperature or in other abiotic factors, and small differences in these factors between the bottom and the surface of the pools. Our results indicate that, while it had no direct effects on the attack success and attack rate of the parasites, water temperature, or other abiotic factors, may have indirectly affected the sticklebacks' chances of being parasitized by changing their vertical distribution, and thus their spatial overlap with parasites.

Vertical distribution of snow crab (Chionoecetes opilio) pelagic stages in the Gulf of St. Lawrence (Canada) and effect of temperature on development and survival

2017 ◽  
Vol 75 (2) ◽  
pp. 773-784 ◽  
Author(s):  
Patrick Ouellet ◽  
Bernard Sainte-Marie
Keyword(s):  
Vertical Distribution ◽  
Close Association ◽  
Relative Survival ◽  
Effect Of Temperature ◽  
Snow Crab ◽  
Eastern Canada ◽  
Chionoecetes Opilio ◽  
Thermal Habitat ◽  
The North ◽  
The Vertical Distribution

Abstract Knowledge of the vertical distribution, thermal habitat, and growth of the larvae of the cold stenothermic snow crab (Chionoecetes opilio) is incomplete and inconsistent. This study explored aspects of the vertical distribution and development rate of larvae from eastern Canada. In the Gulf of St. Lawrence (GSL), during 2002, the mean vertical positions of the snow crab zoeae I and II larvae were recorded within and above the permanent thermocline and in close association with the depth of strong density discontinuities in the stratified water column. No statistically significant differences were detected between nighttime and daytime vertical positions. The water temperatures at the centre of the larvae distributions were 2–3 °C in late May in the colder northern GSL and 7–8 °C in June in the warmer southern GSL. Data from the literature and from a rearing experiment in 2014 were used to develop functions linking development and survival to water temperature. Assuming the snow crab larvae remain in the upper mixed layer until final metamorphosis, development may last 2.2–4 months depending on hatch time and location. Development would be prolonged by several weeks if premolt megalopae move into and reside in the deeper, colder waters as appears to be the case. A relative survival index suggests that optimum temperature for development is around 10.8 °C, 9.5 °C, and 8.7 °C for snow crab zoea I, zoea II, and megalopa, respectively. These results should contribute to modelling efforts that aim to evaluate the extent of larval drift and location of potential settlement areas, as well as the potential impact of climate change on snow crab in the North Atlantic.

The vertical distribution of thin features over the Arctic analysed from CALIPSO observations. Part I: Optically thin clouds

Tellus B ◽  
2011 ◽  
Vol 63 (1) ◽  
Author(s):  
Abhay Devasthale ◽  
Michael Tjernström ◽  
Karl-Göran Karlsson ◽  
Manu Anna Thomas ◽  
Colin Jones ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
The Arctic ◽  
The Vertical Distribution

Effect of Temperature Gradients on Anammox Activity- A Genome Wide Approach

2018 ◽  
Vol 2018 (7) ◽  
pp. 5219-5228
Author(s):  
Ananda Shankar Bhattacharjee ◽  
Sha Wu ◽  
Ramesh Goel
Keyword(s):  
Temperature Gradients ◽  
Effect Of Temperature ◽  
Genome Wide ◽  
A Genome ◽  
Anammox Activity
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