scholarly journals DIEL ACTIVITY RHYTHMS AND THERMOREGULATORY BEHAVIOR OF BLUEGILL IN RESPONSE TO UNNATURAL PHOTOPERIODS

1975 ◽  
Vol 149 (1) ◽  
pp. 96-108 ◽  
Author(s):  
THOMAS L. BEITINGER
Keyword(s):  
Diel Activity ◽  
Thermoregulatory Behavior ◽  
Activity Rhythms

Pheromone-Mediated Diel Activity Rhythms of Male Asian Gypsy Moths (Lepidoptera: Lymantriidae) in Relation to Female Eclosion and Temperature

1996 ◽  
Vol 89 (5) ◽  
pp. 745-753 ◽  
Author(s):  
Ring T. Cardé ◽  
Ralph E. Charlton ◽  
William E. Wallner ◽  
Yuri N. Baranchikov
Keyword(s):  
Diel Activity ◽  
Activity Rhythms ◽  
Gypsy Moths

Diel activity and thermoregulatory behavior of a fully aquatic frog: Xenopus laevis

Hydrobiologia ◽  
1980 ◽  
Vol 75 (2) ◽  
pp. 189-191 ◽  
Author(s):  
Martha Elizabeth Casterlin ◽  
William Wallace Reynolds
Keyword(s):  
Xenopus Laevis ◽  
Diel Activity ◽  
Thermoregulatory Behavior

scholarly journals Freezer on, lights off! Environmental effects on activity rhythms of fish in the Arctic

2017 ◽  
Vol 13 (12) ◽  
pp. 20170575 ◽  
Author(s):  
Kate L. Hawley ◽  
Carolyn M. Rosten ◽  
Thrond O. Haugen ◽  
Guttorm Christensen ◽  
Martyn C. Lucas
Keyword(s):  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Individual Variability ◽  
Day Length ◽  
The Arctic ◽  
Diel Activity ◽  
Polar Regions ◽  
Winter Solstice ◽  
Activity Rhythms ◽  
Polar Day

Polar regions are characterized by acute seasonal changes in the environment, with organisms inhabiting these regions lacking diel photoperiodic information for parts of the year. We present, to our knowledge, the first high-resolution analysis of diel and seasonal activity of free-living fishes in polar waters (74°N), subject to extreme variation in photoperiod, temperature and food availability. Using biotelemetry, we tracked two sympatric ecomorphs of lake-dwelling Arctic charr ( Salvelinus alpinus n = 23) over an annual cycle. Charr activity rhythms reflected the above-surface photoperiod (including under ice), with diel rhythms of activity observed. During the dark winter solstice period, charr activity became arrhythmic and much reduced, even though estimated light levels were within those at which charr can feed. When twilight resumed, charr activity ensued as diel vertical migration, which continued throughout spring and with increasing day length, despite stable water temperatures. Diel activity rhythms ceased during the polar day, with a sharp increase in arrhythmic fish activity occurring at ice-break. Despite contrasting resource use, circannual rhythms were mirrored in the two ecomorphs, although individual variability in activity rhythms was evident. Our data support conclusions of functionally adaptive periods of arrhythmicity in polar animals, suggesting maintenance of a circannual oscillator for scheduling seasonal behavioural and developmental processes.

Diverse Activity Rhythms in Sharks (Elasmobranchii)

2020 ◽  
Vol 35 (5) ◽  
pp. 476-488 ◽  
Author(s):  
Michael L. Kelly ◽  
Errol R. P. Murray ◽  
Caroline C. Kerr ◽  
Craig A. Radford ◽  
Shaun P. Collin ◽  
...  
Keyword(s):  
Activity Patterns ◽  
Respiratory Physiology ◽  
Diel Activity ◽  
Spiny Dogfish ◽  
Activity Rhythms ◽  
Light Regimes ◽  
Circadian Organization ◽  
Galeorhinus Galeus ◽  
Port Jackson ◽  
Constant Dark

Sharks are an interesting group of vertebrates, as many species swim continuously to “ram” oxygen-rich seawater over their gills (ram ventilators), whereas other species “pump” seawater over their gills by manipulating buccal cavity volume while remaining motionless (buccal pumpers). This difference in respiratory physiology raises the question: What are the implications of these differences in lifestyle for circadian rhythms? We investigated the diel activity patterns of 5 species of sharks, including 3 ram ventilating species: the school shark ( Galeorhinus galeus), the spotted estuary smooth-hound ( Mustelus lenticulatus), and the spiny dogfish ( Squalus acanthias); and 2 buccal pumping species: the Port Jackson ( Heterodontus portusjacksoni) and draughtsboard ( Cephaloscyllium isabellum) sharks. We measured the amount, duration, and distance traveled while swimming over multiple days under a 12:12 light:dark light regime for all species and used modified light regimes for species with a clear diel rhythm in activity. We identified a surprising diversity of activity rhythms. The school shark and smooth-hound swam continuously; however, whereas the school shark swam at the same speed and covered the same distance during the day and night, the smooth-hound swam slower at night and traversed a shorter distance. A similar pattern was observed in the spiny dogfish, although this shark swam less overall. Both the Port Jackson and draughtsboard sharks showed a marked nocturnal preference for swimming. This pattern was muted and disrupted during constant light and constant dark regimes, although circadian organization of this pattern was maintained under certain conditions. The consequences of these patterns for other biological processes, such as sleep, remain unclear. Nonetheless, these 5 species demonstrate remarkable diversity within the activity rhythms of sharks.

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