Cod On Duty!!

I read this article on how the Cod has a huge key role on the whole Baltic Sea. Study shows that when the Cod population increases in the Central Baltic, it spreads into larger areas. On the other hand when its population decreases, it concentrates into the Southern Baltic Sea and disappears from the other systems, and it cannot reproduce. I also read that the Cod’s presence and absences in the Gulf Of Riga impacts the whole ecosystem from the main fish, the herring, to the zoo-plankton and phytoplankton. The presence of the Cod in the Gulf Of R. can decrease the intensity of Algal blooms.

Questions:
1: How did they find out that the Cod was a key role?
2: What other fish do you think has a key role on the Baltic Sea?

Underwater Storm

From: http://i.dailymail.co.uk/i/pix/2012/02/21/article-0-11D6DE68000005DC-887_634x477.jpg

I was interested in reading more about this article about how a “storm” was occurring under the sea. This swirling mass of water that’s 93 miles wide and is located off the coast of South Africa was said to be harmless. This storm was formed from the Agulhas Current that flows along the southeastern coast of Africa and around the tip of South Africa.

These sea storms are known as eddies which form bizarre whirl shaped shapes deep beneath the ocean’s surface. Agulhas eddies which are also called “current rings” are the largest in the world. What these eddies do, specifically this one, is move around warm, salty water from the Indian Ocean to the South Atlantic Ocean.

I’m pretty surprised that something like this could ever happen.

What do you think about this?

How could this become a negative outlook?

Goby Girls Go Gaga Over Guys

Normally, you would think most male species would be the one fighting for their girl. Not in this case apparently. In this interesting article, researchers have found that female gobies are more desperate in breeding during the summer season than in the spring. It’s funny because the males have the opposite reaction. The males are only interested in mating during the spring season and tend to be more picky in the summertime. This puts a strain to the females, making competition even more fierce. Talk about a turnabout!

It made me curious as to why the number of male gobies decreases during the spring and early summer. Researchers say that they have a hard time defending their territory while caring for the eggs at the same time. It’s probably why there is more work for the males’ part. They are more exposed to predators and being a stay-at-home dad can be tiresome! This imbalance of low males- high females ratio might be nature’s way of regulation.

Do you think the behaviors of the female gobies would be reversed if the amount of male gobies were to suddenly increase?

What other species share the same behavior where females compete for their guys?