. The Earth beneath the sea : History . Fig. 4. Some Recent planktonic Foraminifera. (1897) noticed that the Foraminifera obtained in plankton tows in high latitudes are different from those of temperate and tropical waters, and a few investi- gators have since made more detailed biogeographic studies on this group. Schott (1935) mapped the distributions of living planktonic Foraminifera in the equatorial part of the Atlantic Ocean and noted that at least some of the species showed distribution patterns apparently related to surface water masses as defined by temperature and chemical character
. The Earth beneath the sea : History . Fig. 4. Some Recent planktonic Foraminifera. (1897) noticed that the Foraminifera obtained in plankton tows in high latitudes are different from those of temperate and tropical waters, and a few investi- gators have since made more detailed biogeographic studies on this group. Schott (1935) mapped the distributions of living planktonic Foraminifera in the equatorial part of the Atlantic Ocean and noted that at least some of the species showed distribution patterns apparently related to surface water masses as defined by temperature and chemical characteristics. Be (1959), investigating the Foraminifera in the upper 200-350 m of water in the North Atlantic over an area bounded by 35-44°N, 55-65°E, found the biocoenoses to differ in the three water masses represented (the slope-water in the north, the Gulf Stream and the Central Atlantic water of the Sargasso Sea). Most of the nineteen species occurring in this area were found throughout the region, but groups of species separated as cold-tolerant and warm-tolerant differ in relative abundance from one water mass to another. Bradshaw (1959) found it possible to group the twenty-seven species of planktonic Foraminifera which he found in the North and Equatorial Pacific Ocean into four faunas (subarctic, transitional, central and equatorial-west-central) with limits corresponding in a general way with those of the surface water masses. Many of the species occur in two or more of his faunal regions, but zones of relative abundance are more restricted. In Chapter 31 of this book Ericson discusses the interrelation between water temperature and coiling direction of the planktonic foraminifer Globorotalia truncatulinoides.
Size: 1975px × 2531px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
