OTTERS AID SEAGRASS RECOVERY

To restore lost seagrass, just add some otters. According to a new study in Proceedings of the National Academy of Sciences, these adorable critters help counteract the harmful effects of fertilizer pollution.

Seagrass provides valuable marine habitat, sequesters carbon, and shields coastlines from storms. But nutrient run-off from farms can trigger overgrowth of algae, which then block sunlight from reaching the seagrass.

The researchers studied seagrass recovery in Elkhorn Slough, California, which has suffered from rising fertilizer pollution over the last several decades. In the early 1980s, only 2 hectares of eelgrass remained. But after sea otters arrived, the area of eelgrass growth expanded by six times.

The otters contributed to the recovery by eating crabs, the authors suggest. The number of sea slugs, which crabs prey on, increased. Those slugs then grazed on the algae, allowing the seagrass to flourish.— Roberta Kwok | 27 August 2013

Source: Hughes, B.B. et al. 2013. Recovery of a top predator mediates negative eutrophic effects on seagrass. Proceedings of the National Academy of Sciences doi: 10.1073/pnas.1302805110.

http://conservationmagazine.org/2013/08/sea-otters-aid-seagrass-recovery/

Image © Maksimilian | Shutterstock

Advertisements

One thought on “OTTERS AID SEAGRASS RECOVERY

  1. Pingback: Geese and wigeons help seagrass grow | Dear Kitty. Some blog

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s