1:45 PM - 3:15 PM
[O11-P75] Research into the impact of river works on ecosystem
Keywords:ecosystem, river works
When I was a junior high school student, I got the information that river works would be held on the Mukogawa River located in southeastern Hyogo Prefecture where many aquatic organisms lived and I often went for fishing as my hobby. I was worried that the river environment would change drastically because I didn’t know how the river works were planed and whether the river works would have a negative impact on the aquatic organisms which lived there or not. Therefore, I decided to start a continuous survey to confirm the impact on aquatic organisms.
The survey found that the populations of aquatic organisms which can move on land and have high abilities for swimming tend to recover easily after the river works. On the other hand, it also found that it was difficult for aquatic organisms with low mobility to recover after the river works.
In addition, obstacles were installed during the river works to make space as temporary shelters for aquatic organisms, but the obstacles themselves become buried by sediment in about a year at some parts of rivers with slow flow. They could only function as temporary shelters for aquatic organisms for a short period.
From the above, it was found that it is possible for contributing the recovery of the population of existing aquatic organisms to install obstacles appropriately in places suitable for the environment after checking the habitat of aquatic organisms at the site. We need to carry out river works with consideration for the natural environment of the site and the consideration makes it possible that the diverse ecosystem can be maintained to a certain extent even if the population increases or decreases.
I would like to continue biological surveys in order to summarize the status of aquatic organisms after the river works based on the data before the river works.
The survey found that the populations of aquatic organisms which can move on land and have high abilities for swimming tend to recover easily after the river works. On the other hand, it also found that it was difficult for aquatic organisms with low mobility to recover after the river works.
In addition, obstacles were installed during the river works to make space as temporary shelters for aquatic organisms, but the obstacles themselves become buried by sediment in about a year at some parts of rivers with slow flow. They could only function as temporary shelters for aquatic organisms for a short period.
From the above, it was found that it is possible for contributing the recovery of the population of existing aquatic organisms to install obstacles appropriately in places suitable for the environment after checking the habitat of aquatic organisms at the site. We need to carry out river works with consideration for the natural environment of the site and the consideration makes it possible that the diverse ecosystem can be maintained to a certain extent even if the population increases or decreases.
I would like to continue biological surveys in order to summarize the status of aquatic organisms after the river works based on the data before the river works.