How does rising atmospheric CO2 affect marine organisms?

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Aleutian Islands
Causey, D., Corbett, D.G., Lefvre, C., West, D.L., Savinetsky, A.B., Kiseleva, N.K. and Khassanov, B.F. 2005. The palaeoenvironment of humans and marine birds of the Aleutian Islands: three millennia of change. Fisheries Oceanography 14 (Suppl. 1): 259-276.

The authors analyzed data pertaining to the paleoavifauna hunted by early Aleuts inhabiting the central Aleutian Islands of Amchitka (51.38N, 179.27E), Buldir (51.37N, 176.92E) and Shemya (52.72N, 174.12E), developing a relationship between bird abundance and climate in this region over the past few thousand years. Nearshore foragers such as cormorants and parakeet auklets were shown to have increased in abundance during periods of increased temperature, such as during the Medieval Warm Period (AD 900-1350), whereas piscivorous birds feeding offshore, such as murres and kittiwakes, predominated during colder times.