Breeding success of goshawk significantly dropping in North Kanto area / 0.1 μSv/h increase reduces 10% breeding

(Photo ; Accipiter gentilis [Wikipedia])


On 3/24/2015, Nagoya city university and NPO Goshawk protection fund published their report on Scientific Reports.

In this report, they proved that the radioactive contamination significantly reduces the breeding success of goshawk in north Kanto area such as Tochigi etc..

Especially the hatching rate is severely affected compared to the past ratio in the same area from 1992 to 2010. It was 90% in 2011, which was within the normal range of past 19 years but it dropped to 85% in 2012, and it was decreased to 67% in 2013.

They concluded this significant decrease is closely related to the atmospheric dose and stated 0.1 μSv/h increase in atmospheric dose reduces breeding success by 10%.

They also reported that even though the atmospheric dose comes back to the normal level as before 311, the breeding success keeps decreasing.

They assume it is because goshawk is on the top of the food chain so it is severely affected by biological concentration. The internal exposure is possibly causing the long term effect in breeding success.




Français :

Au nord de Kanto la reproduction de l’autour des palombes se réduit de 10 % à chaque 0,1 μSv/h ajouté


(Photo : Accipiter gentilis [Wikipedia fr])

Le 24 avril 2015, L’université de Nagoya et l’ONG du Fond de Protection de l’Autour ont publié leur rapport dans Scientific Reports.

Dans cet article, ils prouvent que la contamination radioactive réduit significativement le taux de reproduction de l’autour des palombes dans des régions du nord de Kanto comme Tochigi, etc.
En particulier, pour la même région  le taux de reproduction est gravement réduit lorsqu’il est comparé avec ses valeurs de 1992 à 2010. Il était de 90 % en 2011, ce qui est dans la norme des 19 dernières années, mais il est tombé à 85 % en 2012 et il s’est réduit à 67 % en 2013.
Ils concluent que cette grave réduction est étroitement liée à la dose radioactive ambiante et affirment qu’une augmentation de 0,1 μSv/h de cette dose réduit les chances de reproduction de 10 %.
Ils rapportent également que bien que la dose ambiante soit revenue à son niveau normal d’avant le 11-3, le taux de reproduction continue de diminuer.
Ils estiment que l’autour des palombes est particulièrement touché par l’accumulation biologique en raison de sa position en haut de la pyramide écologique. L’exposition interne est sans doute responsable de l’effet à long terme de la radioactivité sur la réussite de ses reproductions.

About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.


April 2015