Effects of dusk and dawn on locomotor activity rhythms in the norway lobster Nephrops norvegicus

1977 ◽  
Vol 39 (3) ◽  
pp. 253-260 ◽  
Author(s):  
R. D. Hammond ◽  
E. Naylor
Keyword(s):  
Locomotor Activity ◽  
Nephrops Norvegicus ◽  
Activity Rhythms ◽  
Norway Lobster

scholarly journals Locomotor Activity Rhythms of Continental Slope Nephrops Norvegicus (Decapoda: Nephropidae)

2004 ◽  
Vol 24 (2) ◽  
pp. 282-290 ◽  
Author(s):  
Jacopo Aguzzi ◽  
Joan B. Company ◽  
Pere Abelló
Keyword(s):  
Locomotor Activity ◽  
Continental Slope ◽  
Nephrops Norvegicus ◽  
Activity Rhythms

scholarly journals Ovary resorption in the Norway lobster (Nephrops norvegicus) and its possible causes with special reference to sperm storage

2020 ◽  
Vol 74 (1) ◽  
Author(s):  
Carola Becker ◽  
Jaimie T. A. Dick ◽  
E. Mánus Cunningham ◽  
Mathieu Lundy ◽  
Ewen Bell ◽  
...  
Keyword(s):  
North Sea ◽  
Demographic Data ◽  
Irish Sea ◽  
Natural Phenomenon ◽  
Nephrops Norvegicus ◽  
North East ◽  
The North ◽  
Norway Lobster ◽  
The North Sea ◽  
Reproductive Cycles

Abstract The Norway lobster, Nephrops norvegicus, is an important fisheries species in the North-East Atlantic area. In some circumstances, mature females of Nephrops norvegicus can resorb their ovary rather than completing spawning, but the implications of this phenomenon to reproductive biology and fisheries sustainability are not known. To understand after effects of ovary resorption, we studied long-term demographic data sets (1994–2017) collected from the western Irish Sea and the North Sea. Our considerations focused on potential correlations among the frequency of resorption, female insemination, and body size of resorbing females. Resorption was continuously rare in the western Irish Sea (less than 1%); whereas much higher rates with considerable year-to-year variation were observed in the North Sea (mean 9%). Resorption started in autumn after the spawning season (summer) had passed. The frequency stayed high throughout winter and declined again in spring. As sperm limitation can occur in male-biased fisheries, we expected a lack of insemination could be responsible for resorption, but affected females were indeed inseminated. Resorbing females were significantly larger than other sexually mature females in the North Sea, but the opposite trend was observed in the western Irish Sea. It is therefore possible that other, environmental factors or seasonal shifts, may trigger females to resorb their ovaries instead of spawning. Resorption may as well represent a natural phenomenon allowing flexibility in the periodicity of growth and reproduction. In this sense, observations of annual versus biennial reproductive cycles in different regions may be closely linked to the phenomenon of ovary resorption.

Effects of Cadmium on Locomotor Activity Rhythms of the Amphipod Gammarus aequicauda

2010 ◽  
Vol 60 (3) ◽  
pp. 444-451 ◽  
Author(s):  
P. S. Morillo-Velarde ◽  
J. Lloret ◽  
A. Marín ◽  
F. J. Sánchez-Vázquez
Keyword(s):  
Locomotor Activity ◽  
Activity Rhythms ◽  
Gammarus Aequicauda

Locomotor activity rhythms of North Atlantic coastal talitroids

2021 ◽  
pp. 1-22
Author(s):  
D. J. Wildish ◽  
S. M. C. Robinson ◽  
M. Black
Keyword(s):  
Locomotor Activity ◽  
North Atlantic ◽  
Activity Rhythms ◽  
Atlantic Coastal

Spatial ecology of Norway lobster Nephrops norvegicus in Mediterranean deep-water environments: implications for designing no-take marine reserves

2021 ◽  
Author(s):  
M Vigo ◽  
J Navarro ◽  
I Masmitja ◽  
J Aguzzi ◽  
JA García ◽  
...  
Keyword(s):  
Deep Water ◽  
Spatial Ecology ◽  
Marine Reserves ◽  
Nephrops Norvegicus ◽  
Norway Lobster

Mitochondrial DNA variation in Northeast Atlantic and Mediterranean populations of Norway lobster, Nephrops norvegicus

2004 ◽  
Vol 13 (6) ◽  
pp. 1377-1390 ◽  
Author(s):  
C. Stamatis ◽  
A. Triantafyllidis ◽  
K. A. Moutou ◽  
Z. Mamuris
Keyword(s):  
Mitochondrial Dna ◽  
Nephrops Norvegicus ◽  
Mediterranean Populations ◽  
Dna Variation ◽  
Northeast Atlantic ◽  
Norway Lobster

Effects of gender, age, and nutrition on circadian locomotor activity rhythms in the flesh fly Sarcophaga crassipalpis

2018 ◽  
Vol 107 ◽  
pp. 265-275 ◽  
Author(s):  
Fritz Prohaska ◽  
Karl H. Joplin ◽  
Darrell Moore
Keyword(s):  
Locomotor Activity ◽  
Sarcophaga Crassipalpis ◽  
Flesh Fly ◽  
Activity Rhythms
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