Jain, Sreepat et al. (2008): Disruption of community structure at isthmus closure

Leg/Site/Hole:
ODP 165
DSDP 68
DSDP 68 502
ODP 165 999
Identifier:
2012-056902
georefid

Creator:
Jain, Sreepat
Smithsonian Institution, National Museum of Natural History, Department of Paleobiology, Washington, DC, United States
author

Buzas, Martin A.
author

Hayek, Lee-Ann C.
author

Identification:
Disruption of community structure at isthmus closure
2008
In: Anonymous, Geological Society of America, 2008 annual meeting
Geological Society of America (GSA), Boulder, CO, United States
40
6
562-563
Two deep-sea sites, ODP 999a and DSDP 502a, 320 Km apart within the Colombian basin, western Caribbean from depths of 2828 m and 3051 m respectively, were examined to assess the effects on the benthic foraminiferal community of the rise of the Isthmus of Panama and the subsequent closure of the Central American Seaway (CAS). Each site was subjected to SHE analysis, an information-theoretic method of biofacies identification and analysis of community structure. Preliminary results indicate that at bathyal-abyssal depths in the Caribbean, changes in the overall benthic foraminiferal species diversity were minor. In contrast, changes in benthic foraminiferal community structure are easily recognized at around 4.2 Ma, the approximate time of the CAS closure. Additionally, the community structure within the Colombian Basin changed at both Sites 999a and 502a before the CAS closure, but the events were asynchronous. After the closure no further oceanographic events disrupted community structures. Thus, this study demonstrates that oceanographic events are easily recognizable through changes in community structure even when changes in traditional proxies are minor.
English
Coverage:Geographic coordinates:
North:12.4437
West:-79.2247East: -78.4422
South:11.2925

Stratigraphy; Atlantic Ocean; benthic taxa; biofacies; Caribbean Sea; Cenozoic; Central America; Central American Seaway; Colombian Basin; communities; Deep Sea Drilling Project; deep-sea environment; DSDP Site 502; Foraminifera; Invertebrata; IPOD; Leg 165; Leg 68; marine environment; microfossils; North Atlantic; Ocean Drilling Program; ODP Site 999; Panama; Protista; species diversity; Tertiary;

.