The cockroach fish that migrate between different lakes and water courses have larger pupils and a better view than the cockroach that remain in one place. The adaptation makes it easier for freight red -eyed migrants to find food in murky waters. This is shown in a great study of the University of Lund in Sweden.
The eyes of animals, like those of humans, are a kind of window to the world. The view controls important behavior, such as looking for food and avoiding predators. Investigating how migration -related challenges can affect the shape and function of the eye, a research team, led by the University of Lund, chose to study Roach.
Roach, a kind of common fresh water in Europe, is dedicated to partial migration. This means that only part of the population migrates from lakes to connected water courses during the winter. Other people remain in the same environment throughout the year.
“We start taking photos of the fish’s eyes and then we follow the migration patterns of 2,000 individual cockroaches for several years and in two different lakes through the use of implanted electronic transponders. It was shown that Roach that migrated had lar study.
Researchers could also show that biggest students provide migratory people with a better opportunity to detect very small visual objects, such as zooplankton, in low light conditions.
By combining empirical data on the eye morphology of the cockroach with theoretical calculations, the research team could estimate how the visual range varies between people depending on the size of the pupil in different light conditions. Such a detailed mapping of the cockroach view had never been done before.
“The fact that migratory individuals have an improved ability to detect visual objects such as zooplankton indicates a strong selection for effective food searches. This is crucial to cover the energy needs required by migration. These results correspond well to previous research, which showed that the migration of cockroaches with insufficient energy reserves runs a higher risk of dying in the currents,” he says.
The new results help researchers understand how ecological and physiological factors form the behavior of migration. Fish stock management could benefit from this knowledge, particularly in relation to environmental changes that affect the conditions of light and the availability of food in aquatic ecosystems.
“Roach plays an important role in the ecosystem. By understanding why some people migrate and others do not, we can obtain a deeper vision of how fish populations respond to environmental changes, which in turn could affect both Fisk’s existence and the dynamics of the lake as a whole,” says Kaj Hulthan.
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