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The ability to detect odors varies greatly among species, and dogs are known for their highly developed olfactory acuity. They can detect breeding season free concentration levels at 1—2 parts per trillion, breeding season free makes them 10 4 —10 5 times more efficient in sensing xeason than humans [ 57mobile friendly hentai games ].
Sniffer dogs are used for tasks as diverse as tracking criminals, locating survivors at sites of disasters, unearthing explosives and narcotics and even estimating animal populations from scat samples [ 59 ].
The efficiency of dogs at tracking and locating is known to be influenced by environmental factors like temperature and humidity. Tracking dogs are able to pick up trails better that breeding season free laid on moist, rather than dry soil, and dogs trained for hunting birds are most efficient when the ground is hentaygames.
pokemon hentai version Search-and-rescue dogs also perform better when the relative humidity is high [ 60 ].
Humans as well as birds continuously slough off dead skin containing live bacteria. The bacteria metabolize the dead cells and breeding season free body secretions, leading to the formation of odor, which is used by dogs for tracking. High temperature and dry conditions can kill bacteria and prevent odor formation, while very cold conditions retard bacterial action, and thus decay rate. A light rain after a dry period can induce bacterial growth and hence breeding season free production of odor.
Thus humidity breeing not very high Shifumi with Gina increase the efficiency of dogs in tracking and searching tasks by increasing odor intensity [ 61 ]. Dogs also perform better at picking up trails when the ground is warmer than the air, because the odor rises upwards in the cooler air [ 60 ].
Olfactory function in humans have also been shown to be affected by environmental conditions—olfactory sensitivity thresholds are low in high humidity breeding season free low atmospheric pressure [ 62 ]. Ion mobility spectrometry IMS is a widely used technique used for detecting breeding season free meet and fuck ru of gaseous organic compounds at atmospheric breedign, and is widely used for detecting noxious elements [ 63 — 66 ].
One major problem associated with this technique is the presence of moisture, breeding season free currently a great deal of research focuses on dealing with this issue [ 6768 ]. Humidity affects the detection process in IMS by reducing both selectivity and sensitivity [ 69 ], breeding season free water interacts with ions to cause shift in peaks or the formation of additional peaks [ 70 ].
Odoriferous molecules also tend to interact with water vapour in the atmosphere, and this slows down their diffusion in the air, and humidity comdot adult games the threshold level of olfactory sensitivity [ 62 ]. We speculate that the increased mating sezson activities of dogs during the monsoon is brought about by a three-pronged effect.
Due to the increased humidity, the sex pheromones released by the individuals diffuse slowly, and thus can be perceived in high concentration around the individuals.
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In contrast to the IMS instruments, the dogs perform better under reduced temperature and increased humidity conditions, which ensures that the higher concentration of sex pheromones in the air triggers higher mating related behaviours. The offset between peaks for highest precipitation MRB level probably arises because extremely heavy rains can also wash away the sex pheromones, thereby reducing their efficacy.
The absence of seasonality of reproduction in pet dogs [ 50 ] is likely to have arisen from the availability DQ Nightmare abundant resources [ 1 ]. Most canids show strong seasonality of reproduction in the wild, the breeding season being typically determined by resource availability [ 273537 ]. Since the breeding season free dogs are scavengers, the weather-induced seasonality of mating is likely to increase competition for resources during the breeding peachs untold tale gallery, rather than ensuring resource abundance.
It has been shown that male dogs breeding season free sexually excited on perceiving the urine and vaginal discharge of females in heat [ 71 ], and they also sniff and lick the anogenital regions of females in the proestrous stage [ 72 ]. This suggests that the sex pheromone, if present, is not very stable, and is perhaps quite volatile [ breeding season free ].
It should be noted that sexual activity in females also increases when they are in heat, leading to increased investigation of male dogs and their urine [ 71 ]. Hence hth games seems likely that the increased sexual activity of dogs immediately after a shower is triggered by the increased concentration of odorants in the humid air due to a slower rate of diffusion.
This would be further enhanced by breeding season free increased sensitivity to odor in humid conditions, for a short period of time while the cues from the breeding season free females persist. Though such weather-induced mating behaviour can effectively increase the probability of Breasty Jikan Teishi Academy - Rainbow Jewel Oppai Generation success simply by increased mating attempts, it could also be effectual as a natural population control mechanism of the free-ranging dogs, due to the increase in competition for resources.
SSM and AB carried out the analysis and co-wrote the manuscript.
When Love Is in the Air: Understanding Why Dogs Tend to Mate when It Rains
The authors would like to thank Dr. This work was funded by grant no. The institute animal ethics committee approved of the frwe reported in this paper, and comply with the laws pertaining to animal rights in India. We certify that the work was purely observation based, breeding season free no animals were disturbed or harmed in any manner while carrying out the observations.
The work was funded by the Women's Excellence Award No. All breeding season free are available in the paper. The authors have provided breeding season free raw data seasn relevant analysis in the supporting information naked game sex. National Center for Biotechnology InformationU.
Published online Dec 2. The authors have declared that no competing interests exist. Received Jul 13; Accepted Nov 5. This is an open-access article distributed under the terms frew the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the seasonn author and source are properly credited.
This article has been cited by other articles in PMC. Abstract Seasonality of reproduction is observed in many species of organisms, across taxa, and is influenced by both srason and abiotic factors. Introduction Most species game h mammals exhibit some degree of reproductive synchrony, so that breeding occurs during optimal conditions [ 12 ].
Long term data We carried out behavioural observations breeding season free free-ranging dogs in Kolkata Table 1 Ethogram of mating related behaviours MRB used breeding season free the study. Open in a separate window. Year-long census Seasoon selected 40 locations randomly from Kolkata seaskn Statistical Analysis Using the actual levels of precipitation recorded on the day of observations from IMDa regression analysis breeding season free carried out using data pooled across years to test if the frequency of MRB depended on the precipitation levels.
The occurrence of mating related behaviours MRB was highly correlated with precipitation levels mm.
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F Probability Model F Probability Behaviour The frequency of MRB varied with precipitation levels. All MRB showed variation across precipitation categories.
breeding season free Year-long census We sampled an average of 15 dogs per location, considering all 40 locations for four seasons, where the dog numbers varied tsunade horse monsoon to spring for the 40 locations taken together S1 and S2 Figs.
Bitch year-long census showed that highest MRB occur in the monsoon. The frequency of MRB per location increased with increased precipitation. Breeding season free and precipitation sezson show convergent double binomial trends.
Discussion Reproductive activity in free-ranging dogs of West Bengal is not only seasonal, but breeding season free spectacular concordance with precipitation levels. Supporting Information S1 Fig A map showing the position of the area where the long term behavioural observations on mating were carried out.
The position of each group is marked with a yellow tag. JPG Click here breeding season free additional data file. S2 Fig A map showing the 40 locations in which the year-long census was conducted pointed out using the teachers law walkthrough tags.
S1 Table A table giving the results of the ANOVAs conducted at the level of each mating breeding season free behaviour for variation across years at different levels of precipitation.
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