12 December 2010
Despite all of the teachings in the bible, Darwin knew there was scientific reasoning behind the creation of life. Darwin’s view of life split the country in half when it came to this debate. Darwin states in is his book Origin of Species, “that natural selection is daily and hourly scrutinizing, throughout the world, the slightest variations; rejecting those that are bad, preserving and adding up all that are good… We see nothing of these slow changes in progress, until the hand of time has marked the lapse of ages.” (Darwin). But when it comes to Sockeye Salmon, Darwin’s idea of not being able to witness ...view middle of the document...
The reason being in more calm waters, like beaches, salmon with deeper bodies have a better chance of finding mates and passing on their genes. So females can dig their eggs into the sand. However, females in the river tend to have bigger bodies then the males. Rivers currents are always changing so that means females have to dig their nests deeper than most other salmon. So in order to get deeper the females must have bigger bodies to get deeper in the waters so their nests would be safe in the water.
Body types can not only help the salmon maneuver around the waters or help the salmon lay eggs, but it can also determine whether the salmon can stay alive or not. Low lake levels can cause larger salmon to get stranded and die out before they get to the breeding grounds. Being smaller in lakes makes it harder to get down deeper for females to lay their eggs but with a low lake level the salmon must be smaller to even get to the breeding grounds. “Salmon breeding in Hansen Creek tend to be smaller, younger, and more streamlined than conspecifics from neighboring populations, suggesting that selection against large individuals could be driving these patterns.” (Carlson, Quinn 2620) Lake levels can ultimately affect the way the salmon breed and how they reproduce. Lake levels play a strong factor in the size of the different salmon in different lakes.
With the size of the sockeye salmon constantly shifting it can cause problems for fisheries especially for The Skeena River System. The Skeena River System is one of the largest fisheries in the world producing the third largest amount of sockeye salmon in the entire world. The Skeena River Shed is made up of twenty one different lakes; the Babine Lake is by far the most important one. Although it produces the most sockeyes, so many sockeyes escape from the fishery. Scientists believe that it is due to the fact of sockeyes decreasing in size due to all of the changes in lake levels and sockeyes trying to adapt to their habitats.
Whenever the name Charles Darwin comes up in topic you immediately think of evolution. Darwin claimed that watching evolution would be virtually impossible. Darwin said in his book Origin of Species “that natural selection is daily and hourly scrutinizing throughout the world, the slightest variations; rejecting those that are bad, preserving and adding up all that are good; silently and insensibly working, whenever and wherever opportunity offers. . . We see nothing of these slow changes in progress, until the hand of time has marked the lapse of ages.” (Darwin 47) Darwin also noted that watching evolution would be more boring than watching paint dry. But biologist Andrew Hendry...