Mate guarding
Reproductive behavior in animals
From Wikipedia, the free encyclopedia
Mate guarding is a reproductive behaviour, primarily of males, in an attempt to increase the likelihood of success of their own sperm fertilizing the eggs of females when competition is involved. Mate guarding behaviour can be pre- or post-copulatory.[1] Studies on the behaviour both based on theory and through experiments have been conducted on a wide range of species.[2] Mate guarding in humans is known.
In organisms where polygamy is dominant such as in most mammals, birds, and insects, there is significant male-male competition even prior to copulation. When organisms mate with multiple males and store sperm, maintaining their viability within storage structures, there is sperm competition and males evolve mechanisms to increase their odds of successful parenting. In some species such as the Apollo butterflies the males produce mating plugs that prevent the female from mating again. In some dragonflies, males will physically hold females after copulation to increase the chances that their own sperm fertilize the eggs laid.[3][4][5] In some moths where males prefer virgin females to mate, males may mark females with chemical compounds after copulation that make them less attractive to males.[6] Mate guarding by males comes with costs for them in terms of reduced time available for feeding and other activities.[7] Males may also have to choose between strategies of mating with multiple females or in choosing fewer females and guarding them during the critical phases.[8] Female strategies can include multiple mating to ensure that they obtain fitter sperm to pass on benefits to their offspring and so mate guarding can sometimes appear as a hindrance to them, however females may also receive other benefits such as protection from predation through the actions of the guarding males.[9][10]
Evolutionary arms race between sexes
Mate guarding is thought to be a component of an evolutionary arms race between males and females that is motivated by reproductive competition and sexual selection. In many animal species, females develop counter-strategies that enable them to retain reproductive choice, while males develop behaviors that increase the likelihood that their sperm fertilizes a female's eggs. When the sexes' reproductive interests diverge, this interaction is an example of sexual conflict. [11]
Prolonged copulation, physical guarding following mating, and the aggressive exclusion of rival males are among the male adaptations linked to mate guarding. These tactics lessen sperm competition and chances for further mating. In many species, however, females mate with multiple males (polyandry), which can enhance reproductive success and increase genetic diversity in offspring. [12] [13]
Females may therefore develop physiological or behavioral strategies, such as sperm storage organs or selective sperm utilization, to thwart male control. This co-evolutionary process illustrates how natural selection continuously modifies reproductive behaviors [14] .
Female Mating Strategies
Females actively participate in mating systems, even though mate guarding mainly represents male reproductive behavior. Females in many taxa use multiple mating as a tactic to improve the fitness of their progeny. Females may obtain genetically compatible sperm, lower their risk of infertility, or increase the genetic variation of their offspring by mating with multiple males.[15]
Insects, birds, fish, and mammals have all been shown to exhibit this phenomenon, which is called polyandry. [16] Male sperm competition brought on by female multiple mating may indirectly enable females to choose better genetic contributors. [17] As a result, female reproductive autonomy contributes to the evolution of mate-guarding behaviors. [18]
Biological and Biomedical Significance
Mate guarding behavior sheds light on more general biological concepts pertaining to sexual selection, evolutionary fitness, and reproduction. [19] The evolution of reproductive anatomy, hormone regulation, and mating behavior among species can be explained by research on reproductive competition. [20]
Understanding reproductive health, evolutionary genetics, and fertility mechanisms has all benefited from research on sperm competition and reproductive conflict[21].Scientists can examine how environmental factors affect population dynamics and reproductive success by conducting comparative studies across animal systems. These discoveries have implications for conservation biology, evolutionary biology, and biomedical studies related to reproductive function. [22]
Examples Across Species
Many different animal groups engage in mate guarding. In order to thwart rival attempts at mating, male dragonflies often stay attached to females after copulation. [23] Males closely accompany fertile females during breeding seasons in some bird species. [24] Territorial defense and heightened alertness during female fertility are examples of mate-guarding behaviors in mammals [24].
Males in certain insects create mating plugs that momentarily obstruct the female reproductive tract[25], decreasing the possibility of further mating. Convergent evolutionary solutions to reproductive competition are demonstrated by these various tactics.