Featured Research

from universities, journals, and other organizations

Lighter meals for fish in the northern Baltic Sea

Date:
June 13, 2013
Source:
Finnish Environment Institute (SYKE)
Summary:
The nutrition available for fish in the northern Baltic Sea has become lighter during the past 30 years.

Cyanobacteria.
Credit: Minna Ylไ-Jarkko

The nutrition available for fish in the northern Baltic Sea has become lighter during the past 30 years.

Related Articles


"The amount of energy available for planktivorous organisms has declined after the late 1970s, as both the food quality of phytoplankton and the mean size of zooplankton have decreased," says senior researcher Sanna Suikkanen from Marine Research Centre at the Finnish Environment Institute.

"The observed change is probably due to complex interactions between climate warming, eutrophication and overfishing."

The study is based on analysis of plankton data originating from the northern Baltic Sea, collected by the Finnish Marine Research Institute, Finnish Environment Institute and Finnish Meteorological Institute during late-summer HELCOM monitoring cruises 1979-2011. In addition to the Gulf of Finland and ลland Sea, also the northern Baltic proper was monitored. The aim was to investigate long-term changes in plankton communities and the environmental factors affecting them. The study was performed as a collaboration between Finnish Environment Institute, Research and Development Institute Aronia and University of Sassari, Italy.

"The most significant change affecting plankton communities in the whole study area is the remarkable increase in late summer surface water temperatures. At the same time, salinity decreased in the Baltic proper. On the other hand, concentrations of dissolved inorganic nutrients increased especially in the Gulf of Finland, which indicates eutrophication."

Increased amount, decreased quality

Several changes were observed in the phytoplankton communities, mostly due to warming and eutrophication. Many species increased, which could be seen in the rise of chlorophyll a concentrations and amount of total phytoplankton. Cyanobacteria, haptophytes and chrysophytes increased in the entire study area. Cryptophytes, on the other hand, decreased in the whole area.

Due to the lower nutritional quality of cyanobacteria and haptophytes, compared to cryptophytes, the food quality for zooplankton has declined despite the general increase of phytoplankton.

Both cyanobacteria and haptophytes, as well as the dinoflagellates that increased in the northern Baltic proper, include many potentially toxic or otherwise harmful species.

Less energy available for fish

In the zooplankton communities, there was an increase of small-sized rotifers, but a decrease of total abundance of zooplankton and especially adult and large cladocerans and copepods. The proportion of younger and smaller individuals in the zooplankton community increased. In practice this means that the amount of energy available for e.g. fish has declined.

"It seems that the large-sized zooplankton of the northern Baltic are suffering from changes in the phytoplankton communities, combined with other stressors, such as climate warming, decrease of salinity and increase of planktivorous fish, caused by e.g. overfishing of the large predatory fish," says Sanna Suikkanen.


Story Source:

The above story is based on materials provided by Finnish Environment Institute (SYKE). Note: Materials may be edited for content and length.


Journal Reference:

  1. Sanna Suikkanen, Silvia Pulina, Jonna Engstr๖m-ึst, Maiju Lehtiniemi, Sirpa Lehtinen, Andreas Brutemark. Climate Change and Eutrophication Induced Shifts in Northern Summer Plankton Communities. PLoS ONE, 2013; 8 (6): e66475 DOI: 10.1371/journal.pone.0066475

Cite This Page:

Finnish Environment Institute (SYKE). "Lighter meals for fish in the northern Baltic Sea." ScienceDaily. ScienceDaily, 13 June 2013. <www.sciencedaily.com/releases/2013/06/130613092202.htm>.
Finnish Environment Institute (SYKE). (2013, June 13). Lighter meals for fish in the northern Baltic Sea. ScienceDaily. Retrieved December 18, 2014 from www.sciencedaily.com/releases/2013/06/130613092202.htm
Finnish Environment Institute (SYKE). "Lighter meals for fish in the northern Baltic Sea." ScienceDaily. www.sciencedaily.com/releases/2013/06/130613092202.htm (accessed December 18, 2014).

Share This


More From ScienceDaily



More Plants & Animals News

Thursday, December 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

When You Lose Weight, This Is Where The Fat Goes

When You Lose Weight, This Is Where The Fat Goes

Newsy (Dec. 17, 2014) — Can fat disappear into thin air? New research finds that during weight loss, over 80 percent of a person's fat molecules escape through the lungs. Video provided by Newsy
Powered by NewsLook.com
The Hottest Food Trends for 2015

The Hottest Food Trends for 2015

Buzz60 (Dec. 17, 2014) — Urbanspoon predicts whicg food trends will dominate the culinary scene in 2015. Mara Montalbano (@maramontalbano) has the story. Video provided by Buzz60
Powered by NewsLook.com
Rover Finds More Clues About Possible Life On Mars

Rover Finds More Clues About Possible Life On Mars

Newsy (Dec. 17, 2014) — NASA's Curiosity rover detected methane on Mars and organic compounds on the surface, but it doesn't quite prove there was life ... yet. Video provided by Newsy
Powered by NewsLook.com
Ivory Trade Boom Swamps Law Efforts

Ivory Trade Boom Swamps Law Efforts

Reuters - Business Video Online (Dec. 17, 2014) — Demand for ivory has claimed the lives of tens of thousands of African elephants and now a conservation report says the illegal trade is overwhelming efforts to enforce the law. Amy Pollock reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins