Walking Fish Reveal how our ancestors evolved Into Land

 

  Walking Fish Reveal how our ancestors evolved Into Land - Approximately 400 million years ago fish colonies began to explore the land and evolved into tetrapods - today amphibians, reptiles, birds, and mammals. However, there are two things that the scientific mystery to this day, that is how the ancient fish use their fins in the body and the terrestrial environment and evolutionary process what happened.

 

The journal Nature published the results of a study conducted by researchers at McGill University who studied the fish Polypterus to learn how to fish the first time be able to walk on land. Polypterus fish is a fish from Africa are able to breathe a breath of air, walk on land, and is similar to the ancient fish that have evolved into tetrapods. The researchers put Polypterus young fish to the mainland for more than a year that aim to reveal how fish move inland and anatomical changes what happened.

Said Emily Standen, a former McGill post-doctoral student who led the project, at the University of Ottawa that "environmental stress conditions can show anatomical changes and variations of behavior, this is a form of developmental plasticity". Further said Emily "We want to use this mechanism to see anatomy and new behavior and we can use this fish to see if they fit with what we know from the fossil record."

Remarkable anatomical changes in fish

 

Fish show anatomical and behavioral changes are significant. Fish terrestrialized more effective by placing their fins closer to their bodies, lifted their heads higher. "Anatomically, they turn into a skeleton chest becomes more elongated with a strong attachment to their chests, perhaps to increase support for walking and reduced contact with the skull potentially allowing movement of the head / neck bigger," said Trina Du, Ph. D McGill student.

"Because a lot of anatomical changes are reflected in the fossil record, we can hypothesize that changes in behavior that we see today reflect what might happen when the fish fossils first walk with their fins on land," says Hans Larsson, Canada Research Chair in evolution macro at McGill and Associate Professor at the Redpath Museum.

Experiment "Polypterus The terrestrialized" is a unique experiment and provide new ideas of how fish use their fins in fossil terrestrial environment and evolutionary process what happened.

Larsson added: "This is the first example we know that demonstrate plasticity can facilitate the development of large-scale evolutionary transitions, by first accessing new anatomy and behavior that will be genetically improved by natural selection."

The study was conducted by Emily Standen, University of Ottawa, and Hans Larsson, Trina Du at McGill University.

This research was supported by the Canada Research Chairs Program, the Natural Sciences and Engineering Research Council of Canada (NSERC) and Tomlinson Post-doctoral fellowship. 


key : freshwater fish, freshwater tropical fish, exotic freshwater fish, salt water fish tank, tropical fish, tropical fish store, flying fish, flying fish little rock, fly fishing, fish recipes, easy fish recipes, fish recipe, healthy fish recipes, grilled fish recipes, fish batter recipe, fish chowder recipe, white fish recipes, fishing games, bass fishing, bass fish, bass fishiing tips 

   
 

Share this

DIKY

NAMA :DIKY RIZKI PRATAMA