Guppy FishIn addition to the senescence pattern, resource availability and density are also important in regulating guppy populations. Guppies reduce their fertility and reproductive distribution in response to scarce food. When the food is abundant, the size of the
Differential reproductive distribution may be the cause of seasonality in some Guppy populations. For example, Guppy Fish during the rainy season from May to December, guppies in the northern area of Trinidad reduce their investment in reproduction regardless of predator levels, possibly in response to the decline in food resources.
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Population density is also important in simpler environments, as greater intraspecific competition leads to a decrease in reproductive rate and somatic growth rate and a corresponding increase in juvenile mortality due to cannibalism. guppy fish in kerala It has been confirmed that guppy populations in predatory habitats are partially regulated by density.
The guppies have the mating system called polyandry, where females mate with several males. Multiple mating is beneficial for men, as male reproductive success is directly related to the number of mating.
The cost of multiple mating for males is very low as they do not bring any material benefit to the females or provide the offspring with parental care. Conversely, multiple mating may be detrimental to women as it reduces the efficiency of foraging and increases the likelihood of predator and parasitic infections. Guppy Fish Kerala & Guppy Fish Thrissur
However, females benefit from multiple pairings of potential benefits. For example, it is noted that mating females multiply to produce more progeny in a shorter gestational period, and their offspring tend to have better traits, such as improved training and the ability to escape predators.
The guppies mate more actively and delay the development of a calf when the second expected partner is more attractive than the first man. Experiments show that female auctioneers prefer a new man to the original man or a brother of the original man with similar phenotypes. The preference of females for reminding new males may explain the excessive phenotypic polymorphism in male guppies.
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Consanguinity usually has negative consequences for physical fitness (inbreeding depression) and as a result, species have developed mechanisms to prevent inbreeding. Inbreeding depression is thought to be largely due to the expression of homozygous harmful recessive mutations.
Numerous inbreeding mechanisms have been described that work before mating. Less well-known, however, are the inbreeding mechanisms that work after intercourse. Guppy’s is a post-copulative inbreeding mechanism that relies on competition between sperm from rival men to achieve fertilization. In the sperm competitions of an unrelated man and a full brother, a significant tendency was observed in the paternity over the unrelated man. Guppy Fish Kerala & Guppy Fish Thrissur