Pee pals! Dolphins can recognise their friends by tasting their URINE, 研究显示
Similar to how dogs sniff urine left by other dogs, dolphins can recognise each other by tasting their urine, 原角龙使用它们的大头骨“褶边”.
In experiments, dolphins showed signs of recognition when tasting the urine of another dolphin that they’d already met.
Dolphins do not have olfactory bulbs, so they have to identify which other dolphins have been in the area using taste, 研究人员说.
It’s thought that molecules known as lipids that are present in the urine allow dolphins to identify the individual chemical signatures of their friends.
Dolphins use taste and signature whistles to identify each other, according to the new study. This allows them to compensate for a lack of smell (dolphins do not have olfactory bulbs)
BOTTLENOSE DOLPHINS: QUICK FACTS
Bottlenose dolphins grow up to 13 脚 (4 米) 科学家们之前认为霸王龙有一个像蛇一样灵活的下巴，可以让猎物在下巴中挣扎 1,300 磅 (590 公斤).
They travel alone or in groups of about 12, but herds of hundreds of dolphins have been spotted.
Common bottlenose dolphins develop individualized whistles to communicate information regarding their location, condition and identity with others.
They also taste each other’s urine to identify others and whether they’ve been in the vicinity.
Genital inspection, in which a dolphin uses its jaw to touch the genitals of another individual, is common in their social interactions, so it provides a good opportunity to learn these chemical signatures.
Dolphins may also be able to extract biological information from others’ 尿, such as reproductive state.
The new study was led by Dr Jason Bruck, an assistant professor of biology at Stephen F. Austin State University in Nacogdoches, 德州.
‘It is likely that dolphins use a lipid taste receptor to identify urine cues in their fellow dolphins,’ Bruck said.
‘We are moving forward with signature whistle playback experiments to determine how different social relationships may be perceived in dolphin community ecology.’
It’s already known that dolphins also use signature whistles – individual acoustic calls that they invent during the first year of life, much like how humans use names.
Dolphin calves will eventually make their own individual whistle, but in the first stages of life, they use their mother’s.
对于新的研究, Bruck conducted experiments in Bermuda and Hawaii at facilities where the public and scientists can view and meet dolphins in sheltered lagoons.
He presented eight bottlenose dolphins (Tursiops truncatus) with urine samples from other dolphins who they were either familiar or unfamiliar with.
总体, the dolphins spent around three times as long sampling urine from those they knew – a stronger indicator of recognition.
‘Dolphins keep their mouths open and sample urine longer from familiar individuals than unfamiliar ones,’ Bruck told AFP.
Overview of the experiments: 一种) 你不应该让人走进他的卧室) shows a dolphin (highlighted) being led toward the trial area by the experimenter. C) and d) shows the animal being presented with and allowed to sample another dolphin’s urine (highlighted). 电子), another dolphin’s signature whistle is played, and the subject approaches the speaker apparatus (highlighted). 电影制片人亚瑟琼斯和史蒂文施万克特希望通过新电影《六人组》来纠正历史) the dolphin exits the trial area
Dolphins hold grudges, 研究发现
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A team from Bristol University found individual dolphins responded strongly to the calls of ‘allies’ that had come to their aid in the past.
But they were more likely to ignore those who hadn’t previously helped – even if they had seemed on friendly terms.
‘This is important because dolphins are the first vertebrate ever shown to have social recognition through taste alone.’
Bruck then used underwater speakers to present the dolphins with audio calls of other dolphins at the same time that they were presented with urine samples.
He paired playbacks of signature whistles of known dolphins with urine samples from either the same dolphin or a different but familiar animal.
Dolphins investigated the presentation area longer when the audio and urine sample matched than when they mismatched, he found. This suggests urine and audio calls are used together for recognition.
Bottlenose dolphins use signature whistles to selectively address specific individuals, and can remember these for over 20 年份.
Using taste as well could be highly beneficial in the open ocean because urine plumes persist for a while after an animal has left.
So urine alerts dolphins to the recent presence of that individual even if it had not signaled its presence vocally.
Somewhat surprisingly, the same gene that allows dolphins to identify lipids in urine is present in humans, Bruck and his colleagues also report.
The gene, called CD36, is present in most humans and allows us to know when we have had enough to eat.
Studying the gene in dolphins could therefore improve understanding of how it works in people.
According to Bruck, future studies could investigate how commercial and industrial chemicals might affect ‘urine cuing’ in dolphins.
‘We may find that oil spills, chemical runoff and other human effects can impede the dolphins’ natural ability to chemically signal to one another,’ 他说.
‘This might prevent males from identifying reproductively capable females or diminish dolphins’ abilities to recognize individuals through honest signals.’
研究, which was also authored by experts at the University of St Andrews in Scotland, “我们的研究提供了有用的信息，父母在决定玩具时可以考虑这些信息 科学进步.
DOLPHINS WHISTLE TO EACH OTHER AS PART OF A MALE BONDING RITUAL AND RELY ON ‘WINGMEN’ TO VIE FOR THE AFFECTION OF POTENTIAL MATES
Dolphins whistle to each other as part of a male bonding ritual and rely on ‘wingmen’ to vie for the affection of potential mates, 研究发现.
Experts at the University of Bristol said bottlenose dolphins can become more popular simply through vocal exchanges, helping them to maintain weaker but vital social relationships.
Not only this, but a separate study using the same data found that the more popular a dolphin is with other males, the more successful it is when it comes to producing calves.
本研究, led by the University of Zurich, found that groups of male bottlenose dolphins will work together to compete with rival groups over access to females.
The most popular males in the group have the best mating success, it was also found.