Crypsis influences escape decisions in the Round-tailed Horned Lizard (Phrynosoma modestum)

2010 ◽  
Vol 88 (10) ◽  
pp. 1003-1010 ◽  
Author(s):  
William E. Cooper, ◽  
Wade C. Sherbrooke
Keyword(s):  
Body Temperature ◽  
Predation Risk ◽  
Upright Posture ◽  
Flight Initiation Distance ◽  
Lower Body ◽  
Running Speed ◽  
Predator Prey ◽  
Sandy Area ◽  
Lower Body Temperature ◽  
Flight Initiation

Flight initiation distance (predator–prey distance when escape begins) increases as predation risk increases. Prey should have longer flight initiation distance when their background, movement, or current posture reduces crypsis. Flight initiation distance of ectotherms may increase at lower body temperature to compensate for slower running speed. However, for cryptic prey, fleeing might increase the probability of being detected. The Round-tailed Horned Lizard ( Phrynosoma modestum Girard, 1852) is eucryptic and resembles small stones. We predicted that flight initiation distance by P. modestum is shorter among stones than on uniform sand. Because movement and upright posture disrupt crypsis, we predicted that flight initiation distance is greater after movement and when standing than when still and lying on the ground. As predicted, flight initiation distances were shorter on a rocky than sandy area, when lying flat than standing, and while immobile than after moving. We measured running speed and flight initiation distance to determine relationships among body temperature, speed, and escape decisions. Running speed and flight initiation distance were reduced at lower body temperature, suggesting that crypsis reinforced by immobility is more advantageous than longer flight initiation distance for cool, slow lizards. The lizards adjusted escape decisions to current effectiveness of crypsis and escape ability.

Take only pictures, leave only… Cameras influence marmot vigilance but not perceptions of risk

2021 ◽  
Author(s):  
Kenta Uchida ◽  
Albert A. Burkle ◽  
Daniel T. Blumstein
Keyword(s):  
Risk Assessment ◽  
Predation Risk ◽  
Visual Stimulus ◽  
Zoom Lens ◽  
Flight Initiation Distance ◽  
Vulnerable Species ◽  
Species Ranges ◽  
Perceptions Of Risk ◽  
Flight Initiation ◽  
Subsequent Risk

Ecotourism promotes conservation efforts while also allowing for low impact observation of wildlife. Many ecotourists photograph wildlife and photography plays an important role in focusing the public’s attention on nature. Although photography is commonly believed to be a low impact activity, how the visual stimulus of a camera influences wildlife remains unknown. Since animals are known to fear eyes pointed towards them, we predicted that a camera with a large zoom lens would increase animal’s vigilance levels. Using yellow-bellied marmots (Marmota flaviventer) as a mammalian model, and adopting a behavioural approach to identify how marmots responded to cameras, we experimentally quantified vigilance and flight initiation distance towards humans when marmots were approached with and without a camera. While a camera was pointed at an individual, marmots allocated less time to searching predators and increased time to looking at the observer than they did without a camera. However, whether a camera was pointed at a marmot or not had no effect on the distance the marmot flushed. Our results indicated that cameras distracted marmots but did not influence subsequent risk assessment (i.e., flight initiation distance); marmots may be curious about cameras but were not threatened by them. Capturing animals’ attentions reduces searching for predators and may increase the vulnerability to predation. Therefore, regulating photography in locations where predation risk is high or vulnerable species ranges’ overlap with humans may be required to reduce photography’s impact on wildlife.

Compensatory changes in escape and refuge use following autotomy in the lizard Sceloporus virgatus

2007 ◽  
Vol 85 (1) ◽  
pp. 99-107 ◽  
Author(s):  
W.E. Cooper, Jr.
Keyword(s):  
Body Part ◽  
Control Group ◽  
Flight Initiation Distance ◽  
Refuge Use ◽  
Predator Prey ◽  
Escape Theory ◽  
Antipredatory Strategies ◽  
Sceloporus Virgatus ◽  
Flight Initiation ◽  
Predator Effects

Following autotomy of a body part to escape from a predator, prey may alter antipredatory strategies to compensate for the inability to use autotomy and impaired escape ability. Because prey that have been captured may increase their assessment of risk posed by a predator, effects of capture may have been attributed to autotomy. I conducted an experiment using three groups of striped plateau lizards ( Sceloporus virgatus Smith, 1938): control, captured, and autotomized. Captured and autotomized lizards were less active on the day after autotomy than controls. Flight initiation distance and distance fled were greater in both experimental groups than in the control group, but did not differ between experimental groups. Flight initiation distance was greater in autotomized than in captured lizards only in males. No sex difference occurred for distance fled. Autotomized lizards entered refuges more than other groups. Escape strategy changed after autotomy to increased reliance on refuge and, in males, to increased flight initiation distance; behaviours that are appropriate to compensate for impaired escape ability. Decreased activity and increased distance fled might erroneously have been considered effects of autotomy, had effects of capture not been assessed. Predictions of escape theory that flight initiation distance and distance fled increase with predation risk were supported.

scholarly journals Lower body temperature in sleeping supine infants.

1995 ◽  
Vol 72 (4) ◽  
pp. 340-342 ◽  
Author(s):  
R G North ◽  
S A Petersen ◽  
M P Wailoo
Keyword(s):  
Body Temperature ◽  
Lower Body ◽  
Lower Body Temperature

scholarly journals Effectiveness Of Tepid Sponge Compresses And Plaster Compresses On Child Typhoid Patients with Fevers

2021 ◽  
Author(s):  
Dwi Hastuti ◽  
Dewi Ummu Kulsum ◽  
Siti Rahmawati Ismuhu ◽  
Oop Ropei
Keyword(s):  
Body Temperature ◽  
Typhoid Fever ◽  
Wilcoxon Test ◽  
School Age Children ◽  
P Value ◽  
Lower Body ◽  
Lower Body Temperature ◽  
Main Complaint ◽  
Before And After ◽  
Average Body

Background: Typhoid is infectious disease which is still encountered widely in various developing countries, especially those located in the tropic and subtropics. Fever is a clinincal manifestation that is often the main complaint of the sufferer. Action can be done to lower body temperature that is tepid sponge compress and plaster compress. Purpose: The purpose of this study is to determine the comparison of the effectiviness of tepid sponge compress and plaster compress of changes body temperature in school age children with typhoid fever in cibabat hospital in year 2017. Methods: The method used is quasy experiment research method with the approach of pretest and post test two design group. As many as 24 samples were taken at the patient ward of hospital Cibabat. Respondents divided into two groups namely tepid sponge compress and plaster compress by way concecutive sampling. This study was conducted for 20 minutes at each intervenstion. Data analysis used Wilcoxon test, dependen t test, and Mann-Withney. Results: Average body temperature before and after given tepid sponge compress are 38,75°C and 38,08°C with temperature different is 0,67°C. While average body temperature before and after given palster compress are 38,80°C and 38,57°C with temperature different is 0,23°C. Mann-Withney test result show that the p value = 0,000 < α = 0,05 which means bottom tepid sponge compress is more effective in lowering body temperature in scholl age children compared with plaster compress. Conclusion: Based on the result of the study, it can recommend tepid sponge compress in the implementation of nursing care to lower body temperature in typhoid fever patients.   Keywords: Fever, Plaster compress, Tepid sponge

Averted predator gaze reduces latency to flee by zebra-tailed lizards (Callisaurus draconoides)

2015 ◽  
Vol 65 (3-4) ◽  
pp. 299-310
Author(s):  
William E. Cooper ◽  
Wade C. Sherbrooke
Keyword(s):  
Short Interval ◽  
Fixed Interval ◽  
Short Latency ◽  
Flight Initiation Distance ◽  
Predator Prey ◽  
Direct Gaze ◽  
The Cost ◽  
Averted Gaze ◽  
Over Time ◽  
Flight Initiation

Directness of a predator’s gaze affects several aspects of antipredatory behavior, including flight initiation distance (FID = predator-prey distance when fleeing begins), which is longer under direct than averted gaze. However, the effect of gaze directness on probability of fleeing or latency to flee (LF) in a short interval when a prey is immobile near an immobile predator is unknown. We predicted that probability of fleeing is greater and LF is shorter if the predator’s gaze is averted than direct. If the predator has not detected the prey, it will detect it immediately and attack when the prey moves while under direct gaze. Therefore, the prey is less likely to flee than if the predator is looking elsewhere. Under direct gaze the cost of fleeing decreases over time because the predator is increasingly likely to detect the prey. Under averted gaze, risk of being detected is constant for immobile prey and increases if the prey flees. Cost of fleeing under averted gaze is therefore constant and lower if the prey flees than under direct gaze at short latency, predicting shorter LF and greater likelihood of fleeing within a short fixed interval. We test this novel prediction of a model of the effect of gaze directness using the zebra-tailed lizard, Callisaurus draconoides. The proportion of lizards that fled was three times greater for averted than direct gaze, suggesting that prey under scrutiny reduce movement to avoid being detected. We discuss effects of gaze on FID, LF and probability of fleeing.

scholarly journals Penerapan Kompres Hangat Terhadap Penurunan Suhu Tubuh Anak Demam Usia Pra-Sekolah

2021 ◽  
Vol 1 ◽  
pp. 1627-1632
Author(s):  
Lia Lutfita Santi ◽  
Siti Rofiqoh ◽  
Windha Widyastuti
Keyword(s):  
Body Temperature ◽  
Normal Limit ◽  
Preschool Age ◽  
Warm Water ◽  
Lower Body ◽  
Lower Body Temperature ◽  
Preschool Age Children ◽  
Preschool Aged Children

AbstractFever is a condition where body temperature exceeds normal limit, caused by an increase in the temperature-regulating center in the hypothalamus. Warm compress is an easy way to lower body temperature. This type of compress involves a clean cloth soaked in warm water, which is applied to the skin. The purpose of this case study is to evaluate a warm compress method in reducing fever. Two preschool-aged children with fever were treated by warm compresses. The results of this case study showed that the first and second patients experienced a decrease in body temperature after warm compresses. Body temperature for the first patient was 39ºC and dropped to normal (37ºC). meanwhile, the second patient temperature was 38,7ºC dropped to 36,5ºC. The conclusion of this study is warm compress can reduce body temperature in children with fever. Nurses or patients may be albe to apply warm compresses as a first ald in reducing fever.Keywords: Preschool Age Children, Fever, Warm Compress AbstrakDemam adalah kondisi suhu tubuh melebihi batas normal yang diakibatkan oleh meningkatnya pusat pengatur suhu di hipotalamus. Salah satu tindakan untuk menurunkan suhu tubuh anak yaitu dengan kompres hangat. Kompres adalah pemeliharaan suhu tubuh dengan menggunakan cairan atau alat yang dapat menimbulkan hangat atau dingin pada bagian tubuh. Tujuan dilakukan penerapan ini untuk mengambarkan penerapan kompres hangat terhadap penurunan suhu tubuh anak demam usia prasekolah. Metode yang digunakan dalam studi kasus ini adalah penelitian deskriptif dengan subyek dua pasien anak usia prasekolah yang mengalami demam. Hasil dari studi kasus ini menunjukan bahwa klien pertama dan kedua mengalami penurunan suhu tubuh setelah dilakukan kompres hangat, pada kasus 1 suhu awal 39ºC setelah dilakukan kompres hangat suhu menjadi 37,1ºC, sedangkan pada kasus 2 dengan suhu awal 38,7ºC setelah dilakukan kompres hangat suhu menjadi 36,5ºC. Kesimpulannya adalah pemberian kompres hangat dapat menurunkan suhu tubuh pada anak dengan demam. Saran bagi perawat dan orangtua untuk dapat menerapkan kompres hangat sebagai alternatif menurunkan suhu tubuh anak dengan demam.Kata kunci: Anak Usia Prasekolah, Demam, Kompres Hangat

Beyond optimal escape theory: microhabitats as well as predation risk affect escape and refuge use by the phrynosomatid lizard Sceloporus virgatus

Behaviour ◽  
2007 ◽  
Vol 144 (10) ◽  
pp. 1235-1254 ◽  
Author(s):  
Dawn Wilson ◽  
William Cooper
Keyword(s):  
Risk Factors ◽  
Individual Differences ◽  
Predation Risk ◽  
Flight Initiation Distance ◽  
Refuge Use ◽  
Escape Theory ◽  
Sceloporus Virgatus ◽  
Flight Initiation

AbstractEscape studies often focus on one variable, but tactics and refuge use vary with microhabitats, exposure, distance to refuge, and temperature. We studied these effects and effects of microhabitats and risk factors (distance from refuge, temperature) on flight initiation distance (FID, distance between predator and prey when escape begins) and distance fled (DF) in the lizard Sceloporus virgatus. FID increased as distance to refuge increased and temperature decreased. DF increased as FID increased, supporting the hypothesis that individual differences in boldness are consistent among encounter phases. Refuges were rock crevices, trees, logs, and grass clumps. Interhabitat differences in FID and DF matched those in distance to refuge. FID was longer for lizards on rocks and ground than trees due to proximity to and use of refuge. Lizards on trees rarely changed microhabitats, moving to the far side and unpredictably up or down. Lizards on slopes fled long distances up slopes. Most lizards on rocks entered crevices or switched microhabitats. Lizards on ground usually changed microhabitats. Optimal escape theory accurately predicted effects of risk on FID, but initial microhabitats and final microhabitats and refuges affected tactics, FID and DF. DF was affected by risk, being longer when lizards remained visible.

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