Dolphins are highly sociable mammals that establish close links with other individuals of the same species and even with dolphins of other species sometimes. They seem to show empathic, cooperative, and altruistic behaviors.

Most species live in groups called pods composed of 2 to 30 dolphins as the number varies, but in some areas with abundant food, many pods can merge forming superpods with more than 1,000 members.

Dolphins depend on this interaction for hunting, mating and defending themselves. In some cases, these superpods include more than one species of cetaceans that seem to interact well together.

PODS, THE REASON

Why do dolphins group? They have several reasons to join, besides following a sample learned since they born. Small dolphin species gather into multi-member pods as a way to compensate for their size when facing predators.

In this sense, these groups provide protection to an animal that does not have large jaws or razor sharp teeth. When Dolphins are together, it is easier for them to survive if they cooperate with each other, either through communication or intimidating the predator if it is a large number of individuals.

DYNAMIC OF THEIR SOCIAL STRUCTURES

It seems that dolphins are free spirits. Studying the dynamic of the social composition of the pods, scientists discovered that when dolphins belong to a group, nothing binds them to it in a matter of space and time, this means that they can move freely to different pods that are in their vicinity, then the movement of members is continuous.

This type of social network is flat and open, and scientists found no evidence of a rigid, closed or semi-closed structure, so dolphins do not have permanent “membership” in any pod.

These open associations are another indication of their high intelligence since these actions require a lot of brain capacity. Likewise, the hydrodynamic shape of their body supports the need to move continuously between several groups of different environments.

Even though pods do not lack social hierarchy, this depends on the species. For example, bottlenose dolphins (Tursiops truncatus) establish dominance biting, chasing and striking their tails or fins against the surface of the water. The marks of teeth remain in the skin of the dolphins and are practically in all the species meaning that confrontations are also part of their life. That is why, when they want to demonstrate “who rules here,” they may not be so charming as usual but more aggressive than we think.

On the other hand, the composition and structure of the groups depend on certain circumstances: age, sex, family ties, reproductive condition and even the history of associations. Studies on the behavior of dolphins indicate that dolphins can have preferences for meeting with particular individuals and that they can be remembered and recognized after experiencing extended periods of separation. Amazing, right?

Dolphin social structure.

TYPES OF PODS

The characteristics of the groups differ according to the number of members and the circumstances mentioned above. Dolphins do not behave the same when they change from one pod to another.

There are three types of pods:

Nursery groups (mothers-offspring).
A calf stays with its mother from birth up to a few years after weaning. Usually, the mother’s bond with her son is very close and continues until the young dolphin is 6 or 8 years old. Since offspring are vulnerable, the females with calves join and form groups where they help each other to feed and protect their offspring. If a young female gets pregnant, she can return to her natal pod to give birth and care for her calf along with her female relatives, forming a multigenerational group.

The males usually do not get close to these groups.

Juvenile pods.
When reaching a certain age, both males and females leave their breeding group and join with other young dolphins, but curiously, they go to the group of their mothers occasionally for a while and then return to their youth group.

Two male dolphins can stay together for 10, 15 or 20 consecutive years.

The members of these groups are engaged in socializing with others and establishing a preamble to mating. Genres, however, are not intimately related for extended periods of time and once a female becomes pregnant, she joins the nursery group.

Adult males.
The structure of the male pods is very complex and similar to a human male group, you will see why.

Often males are related to 2 or 3 individuals of the same gender and create partnerships for cooperation purposes. Two male dolphins can stay together for 10, 15 or 20 consecutive years. The smaller groups have the objective of cooperating to ensure the mating of the others with a specific female. The larger groups make alliances with other herds of males to defend themselves but also to compete. They continue moving from pod to pod throughout their lives.

INTERNAL SOCIAL STRUCTURE

Males are dominant in all groups, but there is no evidence of strong social bonds between them and females. An example of social interaction and their high intelligence is the regular playing activities they perform. Juvenile and adult dolphins often chase each other and toss items such as seaweed back and forth.

Most experts believe that the social relationships formed by dolphins are long lasting.

Dolphins often have close body contact with other dolphins through rubbing, petting, and even hitting each other.

COMMUNICATION, THE GROUND FOR SOCIALIZATION.

Dolphins communicate with their pods usually through whistles. Each dolphin has a unique whistle that identifies it with other members of its group. If an individual is in distress, it uses a particular sound that indicates help is needed, so the pod responds quickly.

SOCIAL ACTIVITY BEYOND LIMITS.

Although it would be normal that dolphins socialize only with their kind, the interest of some species of dolphins to interact with humans is evident. In the wild, dolphins are extremely curious, and they will often engage in contact with people if a chance comes up. In captivity, dolphins are very attached to the people that usually interact with them, like trainers or researchers.

References

William F. Perrin, Bernd Würsig, J.G.M. ‘Hans’ Thewissen. Encyclopedia of Marine Mammals. Academic Press, 2009.

Karen Pryor, Kenneth S. Norris. Dolphin Societies: Discoveries and Puzzles. University of California Press, 1998.

https://link.springer.com/chapter/10.1007/978-1-4757-9909-5_7#page-1

http://www.cbmwc.org/wp-content/uploads/2012/01/Social-structure-of-bottlenose-dolphins-in-Cardigan-Bay-by-Cally-Barnes.pdf

]]> https://www.dolphins-world.com/is-it-true-that-dolphins-greet-as-part-of-socialization/ Wed, 23 Apr 2014 17:41:24 +0000 http://www.dolphins-world.com/?p=2057 Dolphins Greet

Dolphins are considered to be one of the most social animals in the world. They live in groups that are very complex and defined. Studies also show that the members are highly defensive of each other due to the bonds they form within their groups. Dolphins may greet as a way to socialize, and to also set boundaries within their groups.

Through careful observations in their natural environment, it has been documented that the home ranges of various dolphin groups overlap those of others. For example, in Shark Bay Australia the Bottlenose Dolphins have been seen sharing parts of their habitat with other groups of the same species as well as other species of dolphins.

The males of the groups have more dominance and they are more complex when it comes to their role within the group. They don’t defend territories and they don’t patrol but they will defend the members of their group if they need to.

In the Western region of Australia, there is an open society of Bottlenose Dolphins that have been seen expressing a very open society. They don’t have defined boundaries like other animals or humans do. What is also identified is that the relationships they form are very strong and intense.

In a book written by Richard Connor along with another author, they discuss the fact that most mammals that have such complex social interactions and relationships are found to live in semi closed groups with at least one female that is capable of reproducing offspring. Such females will be widely defended by other members of the group.

Connor is also a Biology Professor at UMass Dartmouth and has also stated “an open society is one without such defended boundaries.” His studies include studying the behavior of 120 adult dolphins at Shark Bay, Western Australia. Also on this team were Michael Krutzen, Srdan Randic, and William Sherwin.

What they learned is that the male Bottlenose Dolphins were engaging in pairing up with females or with another male. Sometimes, there would be a third member of the male group and it is believed this allowed them to herd females to a given location to increase the opportunities for mating.

The observations also indicated that the males were often members of a secondary alliance that could have as few as four or as many as fourteen members. One of the groups is known to be active with seven members for at least the past seventeen years.

All of this initial led the research team to think that the dolphins were living a hierarchy and social element similar to that of chimpanzees. This is due to the strong male bonding that takes place. However, the main difference is that chimpanzees are also very defensive of their territory and they patrol it on a regular basis while the dolphins don’t engage in such behaviors.

Dolphins are generally very gentle and they enjoy socializing and showing care towards each other. They are considered to be one of the most peaceful animals in the world, but they can be aggressive when necessary. There are very few noted events though where aggressive behaviors occur between two female dolphins according to the findings of Connor and his team.

While males can be more aggressive towards each other, they don’t seem to engage in such behavior on an ongoing basis. There can be plenty of drama though in the dynamics of the male dolphins of any group though. Watching the complexities of these relationships has been very interesting and some great insight to how dolphins greet and how they live a life different from many other mammals in terms of social interactions.

Source: http://news.discovery.com/animals/dolphins-greet-each-other-120228.html