Locomotor Activity Patterns and Feeding Habits in the Prawn Palaemon Serratus (Pennant, 1777) (Decapoda, Palaemonidae) in the Alfacs Bay, Ebro Delta, Spain

Crustaceana ◽  
1996 ◽  
Vol 69 (1) ◽  
pp. 101-112 ◽  
Author(s):  
G. Guerao ◽  
C. Ribera
Keyword(s):  
Feeding Habits ◽  
Activity Patterns ◽  
Video Recording ◽  
Time Lapse ◽  
Maximum Activity ◽  
Ebro Delta ◽  
Diel Activity ◽  
Organic Debris ◽  
Endogenous Rhythmicity ◽  
Composition Changes

AbstractDiel activity rhythms of the prawn Palaemon serratus from Alfacs Bay, Ebro Delta, Spain, were studied under laboratory conditions by time-lapse video recording. The activity pattern showed endogenous rhythmicity of a circadian period with maximum activity at night. The feeding habits of P. serratus were studied using the frequency-of-occurrence method and the points method. The food of this species mainly consists of molluscs and crustaceans, and the remains of gastropods, amphipods, isopods, bivalves, mysids, copepods, and decapods were identified. The remaining items consisted of cnidarians, polychaetes, ophiuroids, plant material, sand, and unidentified organic debris. Results indicate that P. serratus is a predator of benthic invertebrates rather than a scavenger or detritus feeder. Diet composition changes with the size of the prawn.

scholarly journals Night of the hunter: using cameras to quantify nocturnal activity in desert spiders

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e10684
Author(s):  
Tamara I. Potter ◽  
Aaron C. Greenville ◽  
Christopher R. Dickman
Keyword(s):  
Fire History ◽  
Sand Dunes ◽  
Activity Patterns ◽  
Time Lapse ◽  
Camera Traps ◽  
Diel Activity ◽  
Wolf Spiders ◽  
Research Attention ◽  
Burned Areas ◽  
Night Of The Hunter

Invertebrates dominate the animal world in terms of abundance, diversity and biomass, and play critical roles in maintaining ecosystem function. Despite their obvious importance, disproportionate research attention remains focused on vertebrates, with knowledge and understanding of invertebrate ecology still lacking. Due to their inherent advantages, usage of camera traps in ecology has risen dramatically over the last three decades, especially for research on mammals. However, few studies have used cameras to reliably detect fauna such as invertebrates or used cameras to examine specific aspects of invertebrate ecology. Previous research investigating the interaction between wolf spiders (Lycosidae: Lycosa spp.) and the lesser hairy-footed dunnart (Sminthopsis youngsoni) found that camera traps provide a viable method for examining temporal activity patterns and interactions between these species. Here, we re-examine lycosid activity to determine whether these patterns vary with different environmental conditions, specifically between burned and unburned habitats and the crests and bases of sand dunes, and whether cameras are able to detect other invertebrate fauna. Twenty-four cameras were deployed over a 3-month period in an arid region in central Australia, capturing 2,356 confirmed images of seven invertebrate taxa, including 155 time-lapse images of lycosids. Overall, there was no clear difference in temporal activity with respect to dune position or fire history, but twice as many lycosids were detected in unburned compared to burned areas. Despite some limitations, camera traps appear to have considerable utility as a tool for determining the diel activity patterns and habitat use of larger arthropods such as wolf spiders, and we recommend greater uptake in their usage in future.

Diel Activity and Foraging Behavior of Juvenile American Lobsters, Homarus americanus

1987 ◽  
Vol 44 (6) ◽  
pp. 1195-1205 ◽  
Author(s):  
Peter Lawton
Keyword(s):  
Foraging Behavior ◽  
Behavior Pattern ◽  
Time Budget ◽  
Video Recording ◽  
Time Lapse ◽  
Homarus Americanus ◽  
Central Place ◽  
Diel Activity ◽  
Agonistic Interactions ◽  
Phase Activity

The activity of wild-caught juvenile American lobsters, Homarus americanus (20–46 mm carapace length (CL)), was monitored in the laboratory using time-lapse video recording techniques. Behavioral time-budget analyses indicated that juvenile lobsters are nocturnally active within or close to available shelter. Mussels, Mytilus edulis, provided as prey were picked up, apparently nonselectively, when lobsters ventured out from shelter and were immediately taken back to shelter for consumption. Such shelter-related or central-place foraging behaviors may minimize risk from predation during transition to the wide-ranging activity pattern typical of larger lobsters. Increased hunger led to greater light-phase activity, primarily shelter-related foraging behavior, among individually monitored lobsters. Dominant lobsters in CL-matched pairs also exhibited this behavior pattern, but spent less time within shelter and feeding during dark phases due to involvement in agonistic interactions. Subdominant lobsters spent the least time in shelter, often remained inactive in open areas of tanks, and foraged predominantly during light phases. Increase in predation risk due to adoption of these behaviors may be the major consequence of subdominant status rather than a reduction in food intake.

scholarly journals Into a rhythm: diel activity patterns and behaviour in Mediterranean slipper lobsters, Scyllarides latus

2015 ◽  
Vol 72 (suppl_1) ◽  
pp. i147-i154 ◽  
Author(s):  
Jason S. Goldstein ◽  
Elizabeth A. Dubofsky ◽  
Ehud Spanier
Keyword(s):  
Natural Habitat ◽  
Activity Patterns ◽  
Time Lapse ◽  
Diel Activity ◽  
Physiological Data ◽  
Night Time ◽  
Endogenous Rhythms ◽  
Diel Activity Pattern ◽  
Insight Into ◽  
Constant Dark

Abstract Although the natural history for Mediterranean slipper lobsters (Scyllarides latus) is well established, there exists a disproportionate lack of important biological and physiological data to verify many key traits, including to what extent endogenous rhythms modulate aspects of their behaviour. Although Scyllarids appear nocturnally active, few studies exist that quantify this tendency. Our overall objective was to test the hypothesis that adult slipper lobsters are nocturnal and to determine if their diel activity rhythms are under the influence of an endogenous circadian clock. In the laboratory, we exposed a total of 16 animals (CLavg = 92.6 ± 6.6 mm; CL, carapace length) to a 12 : 12 light : dark (LD) cycle for 7–10 d, followed by ***constant dark (DD) for 15–20 d. Activity was assessed using a combination of time-lapse video and accelerometers. Of a total of 16 lobsters, we analysed data from 15 (one mortality). All 15 lobsters were evaluated using video. Thirteen of these lobsters were also evaluated using accelerometers. All lobsters were more active during night-time than during daytime and synchronized their activity to the LD cycle, expressing a diel activity pattern (τ = 24.04 ± 0.13 h). In DD, lobsters maintained a circadian rhythm with a τ of 23.87 ± 0.07 h. These findings may provide insight into the behaviour of these animals in their natural habitat and help explain their ability to anticipate dawn and dusk.

A Hyperbaric Chamber for Observation of Cell Cultures at Pressure

1987 ◽  
Vol 14 (3) ◽  
pp. 158-160
Author(s):  
J. Jenssen ◽  
G. Bolstad ◽  
T. Syversen
Keyword(s):  
Phase Contrast ◽  
Video Recording ◽  
Time Lapse ◽  
Pressure Effects ◽  
Chamber System ◽  
Hyperbaric Chamber ◽  
Stainless Steel Tubing ◽  
Injection Pump ◽  
Pharmacological Studies ◽  
Steel Tubing

A chamber system has been constructed for the study of hydrostatic and gas pressure effects on cells in culture. The chamber is fitted with a phase contrast light microscope allowing direct observation and video recording of the cells at pressure. Cell differentiation over a period of hours to days may thus be recorded and taped from as many as 24 cell samples in the same experiment, using a time-lapse recording technique. Solutions may be introduced and removed through stainless steel tubing via an injection pump, thus providing the additional possibility of biochemical and pharmacological studies.

scholarly journals Reconstruction scheme for excitatory and inhibitory dynamics with quenched disorder: application to zebrafish imaging

2021 ◽  
Author(s):  
Lorenzo Chicchi ◽  
Gloria Cecchini ◽  
Ihusan Adam ◽  
Giuseppe de Vito ◽  
Roberto Livi ◽  
...  
Keyword(s):  
Structural Information ◽  
Activity Patterns ◽  
Synthetic Data ◽  
Light Sheet ◽  
Time Lapse ◽  
Inhibitory Neurons ◽  
Mean Field Approximation ◽  
Directed Network ◽  
Dynamical Regime ◽  
Power Law Distribution

AbstractAn inverse procedure is developed and tested to recover functional and structural information from global signals of brains activity. The method assumes a leaky-integrate and fire model with excitatory and inhibitory neurons, coupled via a directed network. Neurons are endowed with a heterogenous current value, which sets their associated dynamical regime. By making use of a heterogenous mean-field approximation, the method seeks to reconstructing from global activity patterns the distribution of in-coming degrees, for both excitatory and inhibitory neurons, as well as the distribution of the assigned currents. The proposed inverse scheme is first validated against synthetic data. Then, time-lapse acquisitions of a zebrafish larva recorded with a two-photon light sheet microscope are used as an input to the reconstruction algorithm. A power law distribution of the in-coming connectivity of the excitatory neurons is found. Local degree distributions are also computed by segmenting the whole brain in sub-regions traced from annotated atlas.

Time-lapse Phase-contrast Microphotography of Cell Populations as a Basis for Improvement of In Vitro Toxicity Assessment

1992 ◽  
Vol 20 (2) ◽  
pp. 302-306
Author(s):  
Miroslav Červinka
Keyword(s):  
Cell Proliferation ◽  
Cell Morphology ◽  
Video Recording ◽  
Toxicity Testing ◽  
Time Lapse ◽  
Time Dependent ◽  
In Vitro Toxicity ◽  
Simple Modification ◽  
Pertinent Data

Recent trends in the field of in vitro toxicology have centred around the validation of in vitro methods. The ultimate goal is to obtain pertinent data with the minimum of effort. In our laboratory, we have used toxicological methods based on the evaluation of cell morphology and cell proliferation. A method suitable for this purpose is time-lapse microcinematographic (or video) recording of cellular changes, which we used for many years. For practical in vitro toxicity testing, however, this method is far too complicated. Therefore, we have tried to develop a simple modification for the evaluation of cell morphology and cell proliferation, which would still allow for a basic time-dependent analysis. Comparison of detailed microcinematographic analysis with analysis according to our new proliferation assay is demonstrated with cisplatin as the toxicant. We believe that a time-dependent approach could improve the in vitro assessment of toxicity.

Activity patterns of wild Bactrian camels (Camelus bactrianus) in the northern piedmont of the Altun Mountains, China

2015 ◽  
Vol 65 (3-4) ◽  
pp. 209-217 ◽  
Author(s):  
Yadong Xue ◽  
Diqiang Li ◽  
Wenfa Xiao ◽  
Fang Liu ◽  
Yuguang Zhang ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Endangered Species ◽  
Activity Patterns ◽  
Relative Activity ◽  
Diel Activity ◽  
Arid Areas ◽  
Critically Endangered Species ◽  
Camelus Bactrianus ◽  
Diel Activity Patterns ◽  
Bactrian Camels

There are significant gaps in our knowledge of wild camel ecology; especially the activity patterns that allow them to adapt to desert environments. The wild Bactrian camel (Camelus bactrianus) is a critically endangered species that survives in the extreme desert conditions of Central Asia. We conducted camera trapping surveys at seven watering sites in the northern piedmont of the Altun Mountains from 2010 to 2012. We analyzed the frequency of photo-captures to elucidate the wild camels’ diel activity patterns, and the seasonal variation in their activity at watering sites. We found that these wild camels were predominantly diurnal at watering sites, with an increase in relative activity from sunrise, reaching a peak toward midday, and then gradually decreasing in activity until sunset. The camels visited watering sites more often in winter than in summer. These results provide a guide for water development in the conservation of ungulates in arid areas.

scholarly journals Effects of human settlement and roads on diel activity patterns of elephants (Loxodonta africana )

2018 ◽  
Vol 56 (4) ◽  
pp. 872-881 ◽  
Author(s):  
Kaitlyn M. Gaynor ◽  
Paola S. Branco ◽  
Ryan A. Long ◽  
Dominique D. Gonçalves ◽  
Petter K. Granli ◽  
...  
Keyword(s):  
Activity Patterns ◽  
Loxodonta Africana ◽  
Diel Activity ◽  
Human Settlement ◽  
Diel Activity Patterns

Collecting Vehicle-Speed Data by Using Time-Lapse Video Recording Equipment

2003 ◽  
Vol 1855 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Christopher Strong ◽  
Scott Lowry ◽  
Peter McCarthy
Keyword(s):  
Real Time ◽  
Video Recording ◽  
Warning System ◽  
Time Lapse ◽  
Vehicle Speed ◽  
Recording Equipment ◽  
Safety Improvement ◽  
Camera Location ◽  
Message Signs ◽  
Time Lapse Video

An innovative application of time-lapse video recording is used to assist in an evaluation of a highway safety improvement. The improvement is an icy-curve warning system near Fredonyer Summit in northern California that activates real-time motorist warnings via extinguishable message signs, based on weather readings collected from road weather information systems. A measure of effectiveness is whether motorist speed is reduced as a result of real-time warnings to drivers. Why indirect speed measurement with video was preferred over radar for this case is discussed, as is how specific methodological issues related to the custom-built equipment, including camera location and orientation, distance benchmarking, and data collection and reduction. Theoretical and empirical accuracy measurements show that the video surveillance trailers yield results comparable to radar and, hence, would be applicable for studies in which speed change is measured. Because this particular technology had not been used previously, several lessons are documented that may help determine where and how similar equipment may be optimally used in future studies.

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