| Planktonic foraminifera recovered from 25 deep-sea sediment samples (core-tops) from the eastern Equatorial Pacific were analyzed for their geographic distribution and possible environmental controls. Samples collected deeper than the carbonate lysocline (~2800 m) show significant signs of dissolution, - when compared to sediment-trap samples -, resulting in the increase of the solution-resistant species Neogloboquadrina dutertrei, Neogloboquadrina pachyderma and Globorotalia cultrata and the reduction of the solution-susceptible species Globigerinita glutinata, Globigerinoides ruber and Globigerinoides sacculifer. Three bioprovinces were recognized by cluster analysis: (1) bioprovince I that occurs on the Cocos Ridge where G. cultrata and N. pachyderma... |
