Gupies under stress: How to influence predatory fishing bodies and reproduction!

Gupies under stress: How to influence predatory fishing bodies and reproduction!

The fascinating adaptation mechanisms of guppies (Poecilia Reticulata) focus on a recent study by Alexander Kotrschal at the University of Wageringen in the Netherlands. In his experiment, 180 guppies were placed in large pelvis separately, which imitated the habitat on Trinidad. Each basin had a predator, the pike cichlid (Crenicichla Alta), which led to a dramatic decline in the guppy population. After about 1.5 months, the predatory fish had decimated the guppies by a fifth. The surviving females and males were then released into predatory -free bassins, where they showed off.

In the third generation of guppy, it was documented exactly when the females measured how many young fishing behavior and the physique of the offspring. Kotrschal found that guppy females from the predatory fish pool made faster, had fewer offspring overall, but produced larger and more young fish. Higher predatory pressure thus led to an earlier reproduction, while larger offspring had a significant survival advantage because they were eaten less likely. Male guppies, on the other hand, had shorter cocks and genital organs after three generations, which may increase their maneuverability.

adjustments under predatory pressure

The study illustrates how environmental factors influence reproductive behavior and the physical properties of guppies. Probable fishing females were smaller and lighter, but also faster than control lines, which indicates that a small body size could reduce the hunting lust of the robber. Despite the threat of predatory fish, the males kept their powerful colors, which are considered an advantage in research in the attraction of females.

In addition, John Endler's observations support a biologist who researched the variety of colors at Gupys. He found that guppies that lived in predator -free areas had significantly more lively colors. Endler's studies show how the color patterns of the male guppies can develop as a compromise between the attraction of females and the avoidance of predators. A quick adaptability to the pirate is crucial, which is also mentioned by evolutionary biologist David Reznick, who explained that guppies learn within 30 to 60 generations to adapt to the predators in their environment.

conclusion and outlook

The results of these and similar studies offer valuable insights into the quick evolution of animals and the dynamics between predator and prey. They show that animals can develop faster than it can be seen from the fossil report. Kotrschal experimental study on the adaptations of the guppies and the associated biological changes illustrate the complexity of evolution in the face of environmental changes and predators.

For more information, the research results are on the website of Gupy Evolution as well as Nature