Best answer: Why should paternal care in fish be associated with external fertilization?

We show that paternal care has evolved at least 30 times independently in fish and is found exclusively in externally fertilizing species. Male care is positively associated with pair spawning, suggesting that confidence in paternity is an important determinant of the evolution of care.

Why do male fish provide parental care?

Discussion. Compared to other taxa, paternal care in fish appears to have little impact on offspring survival. Instead, we find that the benefit of providing care comes from increased mating success. Females prefer caring males, particularly when males increase care with more offspring.

Why male fishes are so often parental?

fact, in some fish species, females are most attracted to males that already have eggs in their nests. … Therefore, male care is more common in fishes because the costs of providing care are lower for males than for females.

Why do fish have external fertilization?

External fertilization usually occurs in aquatic environments where both eggs and sperm are released into the water. After the sperm reaches the egg, fertilization can then take place. … External fertilization in an aquatic environment protects the eggs from drying out.

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What is parental care in fish?

Parental care is any behavior pattern in which a parent invests time or energy in feeding and protecting its offspring. Parental care is a form of altruism since this type of behaviour involves increasing the fitness of the offspring at the expense of the parents.

What is the important pattern that we see in fish with paternal parental care?

One important pattern is that every species with paternal care also uses external fertilization — sperm and egg meeting out in the open — and spawns in pairs, not groups.

What is an example of parental care?

Parental care refers to any behaviors on the part of either or both parents that help their offspring survive. In many birds, parental care includes building a nest and feeding the young. … For example, tilapia practice a behavior called oral brooding. The mother carries the eggs in her mouth until they hatch.

What are the benefits of parental care?

Care can be beneficial if parents (1) increase offspring survival during the stage in which parents and offspring are associated, (2) improve offspring quality in a way that leads to increased offspring survival and/or reproduction in the future when parents are no longer associated with offspring, and/or (3) directly …

What is best known for parental care?

Parental care is seen in many insects, notably the social insects such as ants, bees and wasps; in certain fishes, such as the mouthbrooders; widely in birds; in amphibians; some reptiles and especially widely in mammals, which share two major adaptations for care of the young, namely gestation (development of the …

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What is parental care in Amphibia?

Among amphibians, parental care includes- Attendance. of the eggs, transportation of eggs or larvae, and feeding of larvae. Parental care is associated only with those species that place their eggs in single clusters, never with those that scatter their eggs in aquatic situations.

What is the major disadvantage of external fertilization?

Disadvantages of external fertilization include a reliance on water and the large amount of wasted sperm and eggs that never reach a corresponding gamete, even when the organisms releasing the eggs and sperm are in close proximity.

What is an example of external fertilization?

Fish. Salmon, cod, trout, and char are all examples of the fish that externally fertilize. The female and male both release their gametes into the water, where they diffuse together and fertilize. … Also, the faster the speed of the sperm, as well as the number of sperm will increase the chances of fertilization.

Is external fertilization asexual?

In asexual reproduction, an individual can reproduce without involvement with another individual of that species. … During sexual reproduction, the male gamete (sperm) may be placed inside the female’s body for internal fertilization, or the sperm and eggs may be released into the environment for external fertilization.

What do you mean by parental care?

Parental care can be defined as any non-genetic contribution by a parent that increases the fitness of offspring, and can occur before or after laying or birth (Stahlschmidt and DeNardo, 2011).

What is viviparous fish?

Viviparous fish are fish which give birth to live young, the eggs develop whilst receiving nutrition from the parent. See also:Category:Ovoviviparous fish – fish which give birth to live young which do not receive nourishment from the parent whilst in the womb.

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What is fish electric organ?

Electric organs are masses of flattened cells, called electrocytes, which are stacked in regular rows along the sides of certain fishes, e.g., the electric eel of South America. The posterior surface of each electrocyte is supplied with a motor neuron. … (In most fishes, electrocytes are, in fact, modified muscle cells.)

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