Seasonal distribution of genetic types of planktonic foraminifer morphospecies in the Santa Barbara Channel and its paleoceanographic implications

M, Kucera,; KF, Darling,; CM, Wade,; Langen, P, von; D, Pak,

Abstract

We present data on the temporal distribution of planktonic foraminifer genotypes (small subunit (SSU)ribosomal (r) RNA gene) and morphospecies (sediment traps) collected during 1999 in the Santa Barbara Channel. The sampling was undertaken with special emphasis on paleoceanographically important morphospecies, predominantly Globigerina bulloides. We found the same genotype of G. bulloides (type IId)in all the changing hydrographic regimes associated with this region throughout the annual cycle with the exception of January, when we recorded the additional presence of the high-latitude G. bulloides type IIa. We identified three new genotypes: Neogloboquadrina dutertrei type Ic, N. pachyderma dextral type II, and Turborotalita quinqueloba type IId. Our data suggest that G. bulloides type IId and possibly even the newgenotypes listed above may be associated specifically with the complex hydrography or other environmental features characteristic of this area. Since G. bulloides type IId occurs throughout the year and its peak fluxes are related to different hydrographic regimes, we argue that the physical properties of the water column are not themajor factor influencing the distribution and growth of this genotype. In sediment trap samples we found a skewed coiling ratio for G. bulloides (most likely representing type IId), which is related neither to sea surface temperature nor to genotypic difference. This study illustrates the necessity to map both the spatial and temporal distribution of the genetic types, especially in areas of paleoceanographic interest, where geochemical andpaleontological proxies are being calibrated

Citation

M, K., KF, D., CM, W., Langen, P, V., & D, P. (2001). Seasonal distribution of genetic types of planktonic foraminifer morphospecies in the Santa Barbara Channel and its paleoceanographic implications. Paleoceanography, 18(2), https://doi.org/10.1029/2001PA000723

• Journal Article Type: Article
• Acceptance Date: Nov 11, 2002
• Online Publication Date: May 9, 2003
• Publication Date: 2001
• Deposit Date: May 31, 2024
• Journal: Paleoceanography
• Print ISSN: 0883-8305
• Electronic ISSN: 1944-9186
• Publisher: American Geophysical Union
• Peer Reviewed: Not Peer Reviewed
• Volume: 18
• Issue: 2
• DOI: https://doi.org/10.1029/2001PA000723
• Public URL: https://nottingham-repository.worktribe.com/output/35159780
• Publisher URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2001PA000723