scholarly journals Nocturnal and diurnal activity of armored suckermouth catfish (Loricariidae: Pterygoplichthys) associated with wintering Florida manatees (Trichechus manatus latirostris)

2010 ◽  
Vol 8 (4) ◽  
pp. 893-898 ◽  
Author(s):  
Leo G. Nico
Keyword(s):  
River Basin ◽  
Activity Pattern ◽  
Diel Activity ◽  
Diurnal Activity ◽  
Trichechus Manatus ◽  
Trichechus Manatus Latirostris ◽  
Size Classes ◽  
Diel Activity Pattern ◽  
Spring System ◽  
Diel Period

Several Pterygoplichthys species, members of the Neotropical catfish family Loricariidae, have been widely introduced outside their native ranges. In this paper, I present observations on the diel activity pattern of non-native Pterygoplichthys, tentatively identified as P. disjunctivus, with respect to their attachment and grazing on endangered Florida manatees, Trichechus manatus latirostris. The study was conducted in December 2009 at Volusia Blue Spring, an artesianal spring system in the St. Johns River basin, Florida (USA). Supplemented by information gathered during previous visits to the spring site, this study revealed that adult Pterygoplichthys are active throughout the diel period (day, twilight and night). However, juvenile Pterygoplichthys were largely nocturnal and only at night did they consistently join adults in attaching to manatees. The juveniles generally remain hidden during the day, probably responding to presence of diurnal predators, mainly birds. Differences in diel behaviors among different Pterygoplichthys size classes in Florida are consistent with published observations on loricariids inhabiting clearwater streams within their native ranges.

Diel Activity Pattern and Swimming Speeds of Northern Pike (Esox lucius) in Lac Ste. Anne, Alberta

1980 ◽  
Vol 37 (9) ◽  
pp. 1454-1458 ◽  
Author(s):  
James S. Diana
Keyword(s):  
Key Words ◽  
Activity Pattern ◽  
Northern Pike ◽  
Esox Lucius ◽  
Diel Activity ◽  
Seasonal Activity ◽  
Diel Changes ◽  
Pike Esox Lucius ◽  
Diel Activity Pattern ◽  
Ultrasonic Transmitters

Movements of six northern pike (Esox lucius) were monitored for 5 to 51 days by ultrasonic transmitters implanted surgically. The pike were inactive during 80% of the eight hundred and eighty-nine 5-min intervals monitored during summer and winter. No regular diel changes in activity were noted, except that pike were inactive at night. Swimming velocities calculated from gross displacements were maximum, 42 cm/s (0.91 body lengths (BL)/s); average, 23.1 cm/s (0.45 BL/s).Key words: movements, diel activity, seasonal activity, northern pike, Esox lucius; swimming speeds

scholarly journals Diel activity pattern of meso-carnivores in the suburban tropical dry evergreen forest of the Coromandel Coast, India

2019 ◽  
Vol 11 (8) ◽  
pp. 13960-13966
Author(s):  
Kangaraj Muthamizh Selvan ◽  
Bawa Mothilal Krishnakumar ◽  
Pasiyappazham Ramasamy ◽  
Thangadurai Thinesh
Keyword(s):  
Activity Pattern ◽  
Activity Patterns ◽  
Camera Trap ◽  
Diel Activity ◽  
Evergreen Forest ◽  
Breeding Ecology ◽  
Canis Aureus ◽  
Diel Activity Pattern ◽  
Diel Activity Patterns ◽  
Felis Chaus

Sympatric and similar body-sized species exhibit interspecific competition for resources.  The present study investigated diel activity of five meso-carnivore species (Canis aureus, Felis chaus, Paradoxurus hermaphroditus, Viverricula indica, and Herpestes edwardsii) in a human-dominated region of Auroville and around Pondicherry University using camera-trap survey data.  Diel activity pattern and overlap were estimated using the kernel density method.  The Jungle Cat Felis chaus and the Golden Jackal Canis aureus exhibited cathemeral diel activity with a high overlap between them (Δ̂1 = 0.78).  The Indian Grey Mongoose Herpestes edwardsii displayed a diurnal activity pattern and had low overlap with the Small Indian Civet Viverricula indica (Δ̂1 = 0.34).  Moderate overlap was found between the Small Indian Civet and the Palm Civet Paradoxurus hermaphroditus (Δ̂1 = 0.32).  Therefore, diel activity patterns of mesocarnivores indicate inter- and intra-specific trade-off competition avoidance resulting in successful foraging.  The present camera-trap survey has provided insights into diel activity patterns and more attention is required to be paid to the study of feeding and breeding ecology of these species in human-dominated landscapes. 

The emergence of cercariae of Trichobilharzia ocellata and its relationship to the activity of its snail host Lymnaea stagnalis

1976 ◽  
Vol 54 (9) ◽  
pp. 1481-1487 ◽  
Author(s):  
P. A. Anderson ◽  
J. W. Nowosielski ◽  
N. A. Croll
Keyword(s):  
Activity Pattern ◽  
Lymnaea Stagnalis ◽  
Close Association ◽  
Snail Host ◽  
Diel Activity ◽  
Locomotory Activity ◽  
Diel Pattern ◽  
Dark Light ◽  
Diel Activity Pattern ◽  
Trichobilharzia Ocellata

The emergence pattern of cercariae of Trichobilharzia ocellata from Lymnaea stagnalis was examined at 2-h intervals from infected snails acclimatized to 12 h light – 12 h dark periods. A marked diel pattern of emergence was found during the periods of illumination; this was reversed when the light–dark regime was reversed.A method for the continuous recording of the locomotory activity of L. stagnalis is described. Snails acclimatized to either normal or reversed dark–light regimes showed a consistent diel pattern of activity during illumination. Peak activity occurred in the first few hours of illumination.It is proposed that the diel activity pattern results from an internal rhythm in which the snail becomes entrained to the lighting regime. The close association between the diel activity pattern of the snail and the emergence of T. ocellata indicates that host movement stimulates cercarial emergence. Light is thought to influence the cercariae directly and indirectly through the snail.

scholarly journals Observation of Eurasian Otter’s Diel Activity Using Camera Trapping in Central-Eastern Romania

2019 ◽  
Vol 53 (1) ◽  
pp. 47-56
Author(s):  
G. Bouroş ◽  
D. T. Ionescu ◽  
C. Hodor
Keyword(s):  
Activity Pattern ◽  
Camera Traps ◽  
Camera Trapping ◽  
Diel Activity ◽  
The Third ◽  
Eurasian Otter ◽  
Diel Activity Pattern ◽  
Central Eastern ◽  
Flowing Waters

Abstract The observation of elusive mammals, is still problematic, particularly in flowing waters or wetlands. But with the usage of camera traps, it was possible to obtain valuable information about otters. The aim of this study was finding the diel activity of the otters that live in Central-Eastern Romania. The diel activity of the Eurasian otter along its habitat was studied from March 2011 to April 2016 over 1356 days & nights of camera trapping. The camera traps have recorded a total of 222 otter visits at all 10 observation sites. Otters, passing through the observation sites, were strongly nocturnal and displayed a trimodal diel activity pattern, one occurring just before dawn (between 04:00 and 06:30 h), the second one occuring just after dusk (between 18:30 and 22:00 h) and the third one occurring in the middle of the night (between 00:30 and 01:30). Otters have been also active during the Civil Twilight (7.2 %), more active during the dusk (5 %) than during the dawn (2.3 %). Seasonally the Eurasian otters were more active during winter (39.6 %) and progressively less active in spring (31.5 %) summer (9 %) or autumn (19.8 %).

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