Sentences with phrase «polar cod»

10 Fishery biologists observed that «species of fish such as cod, haddock and herring expanded farther north while colder - water species such as capelin and polar cod retreated northward.

In this video portrait, Dr. Felix Mark, marine biologist at Alfred Wegener Institute explains how Atlantic and polar cod compete in Arctic waters.

Due to rising water temperatures, the Atlantic cod is moving northwards and might take over the habitat of the native polar cod.

Laboratory experiments at Alfred Wegener Institute in Bremerhaven have shown that the highly specialised polar cod needs certain temperatures to thrive.

If you extrapolate these findings, there could be more than nine billion polar cod living under the ice in the Eastern Arctic.

What they found: the amphipod crustacean Apherusa glacialis is at the top of the young polar cod's menu.

Above all, the new insights into the juvenile fish under the ice are important because it's still impossible to say how polar cod populations will change in the face of climate change.

In fact, Norwegian researchers recently confirmed that, in a regularly monitored fjord on the island Spitsbergen, for the first time ever there were no polar cod found — but plenty of Atlantic cod.

«When the sea ice melts, juvenile polar cod may go hungry: Biologists confirm how heavily the fish depend on ice algae.»

This information is of fundamental importance, as polar cod are a major source of food for seals, whales and seabirds in the Arctic.

«Up until our expedition, catches had only been made at specific points and observations made on individual polar cod caught beneath the ice by divers,» says David.

If the polar cod population in the Barents Sea actually does shrink, the juvenile fish under the ice of the Eastern Arctic could become even more important — especially in order to make up for losses elsewhere.

Beluga whales, narwhals, ringed seals and numerous Arctic seabirds have one thing in common: their preferred food is polar cod, Boreogadus saida.

«That means the rapid retreat of Arctic sea ice poses an especially serious threat for polar cod.

As such, there is a direct relation between the polar cod and the ice algae, which could ultimately threaten the young polar cod's survival.

All the fish were in top condition, which suggests that there was enough food under the ice, making the sea ice a true nursery ground for polar cod.

«The analysis shows that diatoms make up the most important source of carbon for polar cod,» explains Kohlbach.

Given the polar cod's pivotal role, this could also produce changes throughout the entire food web.»

During their journey, the young polar cod feed on amphipod crustaceans, which in turn feed on ice algae.

To do so, they analysed the fatty - acid patterns and the composition of stable isotopes in the polar cod's muscle and other tissues.

«For the first time, we've been able to use a special net directly below the sea ice to catch a large number of polar cod, and therefore to estimate their prevalence over a large area.

«Billions of juvenile fish under the Arctic sea ice: New under - ice net used in large - scale study on the prevalence of polar cod at the ice underside.»

This allows the researchers to make catches that provide completely new insights into the polar cod's lifecycle.

As climate change causes the Barents Sea to grow warmer, for some years now other fish species like capelin and Atlantic cod have moved further northward, creating new competition that could reduce the polar cod population.

Not exact matches

Sadly, what we do to the polar bear and salmon and cod fish and forests....

Any impact on the populations of tiny crustaceans will affect other creatures higher up the food chain — cod, seals and polar bears — which need fat sources in their diet.

For example, reductions in seasonal sea ice cover and higher surface temperatures may open up new habitat in polar regions for some important fish species, such as cod, herring, and pollock.128 However, continued presence of cold bottom - water temperatures on the Alaskan continental shelf could limit northward migration into the northern Bering Sea and Chukchi Sea off northwestern Alaska.129, 130 In addition, warming may cause reductions in the abundance of some species, such as pollock, in their current ranges in the Bering Sea131and reduce the health of juvenile sockeye salmon, potentially resulting in decreased overwinter survival.132 If ocean warming continues, it is unlikely that current fishing pressure on pollock can be sustained.133 Higher temperatures are also likely to increase the frequency of early Chinook salmon migrations, making management of the fishery by multiple user groups more challenging.134

goodbye polar bears, forests of BC, cod, birds, didn't mean to poison you we thought it was a good idea at the time please come back we've got digital cameras!