Population is all animals of the same species living in a certain area; a community is different species living in a certain area.
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The reason for this is that it's influenced by the Gulf Stream ocean current, which originates from the Gulf Of Mexico and is the same stream that allows countries like England to keep mild during the winter by providing warmer air.
Remember that gyres and ocean currents (along with latitude) major contributors to climate.
Hopefully, this helps!
He was the leader of the underworld and loved death so with this thought it is depicted to be a "gloomy" place