▁nature ▁of ▁det ox ification ▁of ▁b enth ic ▁sed iments , ▁which ▁retain ▁much ▁of ▁the ▁heavy ▁metal ▁poll ution ▁ ▁Mer op l ank ton ▁and ▁climate ▁change ▁ ▁A ▁study ▁conducted ▁in ▁the ▁ ▁North ▁Sea ▁between ▁ 1 9 5 8 - 2 0 0 5 , ▁collected ▁samples ▁of ▁mer op l ank ton ▁using ▁a ▁C PR ▁survey . ▁These ▁samples ▁consisted ▁of ▁lar val ▁e chin od erm s , ▁dec ap ods , ▁b ival ves , ▁cir rip edes , ▁and ▁e ct opro ct s . ▁Mer op l ank ton ▁abund ance ▁as ▁well ▁as ▁P CI ▁levels ▁( amount ▁of ▁ch lor oph yll ▁in ▁each ▁sample ▁in ▁relation ▁to ▁sea ▁surface ▁temperature ) ▁were ▁exam ined . ▁Research ers ▁concluded ▁that ▁e chin od erm ▁lar va e ▁increased ▁in ▁abund ance ▁throughout ▁the ▁study , ▁with ▁the ▁largest ▁increase ▁occurr ing ▁in ▁the ▁Northern ▁and ▁Central ▁regions . ▁Dec ap od ▁lar va e ▁were ▁found ▁to ▁increase ▁in ▁abund ance ▁as ▁well , ▁and ▁were ▁found ▁to ▁appear ▁earlier ▁in ▁the ▁year . ▁B ival ve ▁lar va e ▁showed ▁an ▁overall ▁decl ine ▁in ▁abund ance . ▁It ▁was ▁also ▁concluded ▁that ▁P CI ▁levels ▁increased ▁throughout ▁the ▁study , ▁particularly ▁during ▁the ▁summer ▁months . ▁It ▁was ▁determined ▁that ▁climate , ▁particularly ▁sea ▁surface ▁temperature , ▁drives ▁mer op l ank ton ▁abund ance . ▁War mer ▁sea ▁surface ▁temperature ▁short ens ▁development al ▁time ▁of