δ13C records from fish fossils as paleo-indicators of ecosystem response to lake levels in the Plio-Pleistocene lakes of Tugen Hills, Kenya

Anne L. Billingsley, Peter Reinthal, David L. Dettman, John D. Kingston, Alan L. Deino, Kevin Ortiz, Benjamin Mohler, Andrew Cohen

Research output: Contribution to journalArticle

Abstract

The carbon isotopic ratios of organic matter in fish fossils from diatomites and other lake beds in the HSPDP drill core from Tugen Hills, Kenya (2.56–3.29 Ma) reflect trophic resource uses, and can indicate the dietary habitats of fish in the paleolake. This information offers insight into how fish communities responded to lake-level fluctuations during the Plio-Pleistocene in the East African Rift Valley. We have compared this record with fish fossil isotopes from both a previously published study of a Lake Malawi drill core (139 ka–present) and core top (modern ca 1978) samples collected at the water/sediment boundary from Lake Turkana (Kenya) of known environmental provenance. Both the Lake Malawi drill core fossils (−7.2‰ to −27.5‰ VPDB) and modern Lake Turkana samples (−16‰ to −24.6‰ VPDB) have δ13C values indicating a mix of near-shore and deep-water pelagic species. In contrast, the δ13C values for the Tugen Hills core fossils vary only between −20‰ and −27‰ VPDB. The absence of δ13C values greater than −19‰, suggests none of these fossils are derived from near-shore benthic habitats. The lack of shallow water, benthic lacustrine fish fossils through the Tugen Hills lake cycles may indicate that the rate of change from low-lake stands to deeper lake phases was very rapid, and shallow water communities were not established for long enough to leave a fish fossil record at the core site. These results strongly suggest that lake level responses to climate variability in the Baringo basin of the East African Rift were very abrupt during the Plio-Pleistocene transition.

Original languageEnglish (US)
Article number109320
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume534
DOIs
StatePublished - Nov 15 2019

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ecosystem response
lake level
Kenya
fossils
Pleistocene
fossil
lakes
ecosystems
lake
fish
Lake Malawi
shallow water
water
diatomaceous earth
diatomite
indicator
habitat
rift zone
habitats
isotopic ratio

Keywords

  • East African lakes
  • Fish habitats
  • Fish paleoecology
  • Isotopic geochemistry
  • Plio-Pleistocene climate

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Palaeontology

Cite this

δ13C records from fish fossils as paleo-indicators of ecosystem response to lake levels in the Plio-Pleistocene lakes of Tugen Hills, Kenya. / Billingsley, Anne L.; Reinthal, Peter; Dettman, David L.; Kingston, John D.; Deino, Alan L.; Ortiz, Kevin; Mohler, Benjamin; Cohen, Andrew.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 534, 109320, 15.11.2019.

Research output: Contribution to journalArticle

Billingsley, Anne L. ; Reinthal, Peter ; Dettman, David L. ; Kingston, John D. ; Deino, Alan L. ; Ortiz, Kevin ; Mohler, Benjamin ; Cohen, Andrew. / δ13C records from fish fossils as paleo-indicators of ecosystem response to lake levels in the Plio-Pleistocene lakes of Tugen Hills, Kenya. In: Palaeogeography, Palaeoclimatology, Palaeoecology. 2019 ; Vol. 534.
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abstract = "The carbon isotopic ratios of organic matter in fish fossils from diatomites and other lake beds in the HSPDP drill core from Tugen Hills, Kenya (2.56–3.29 Ma) reflect trophic resource uses, and can indicate the dietary habitats of fish in the paleolake. This information offers insight into how fish communities responded to lake-level fluctuations during the Plio-Pleistocene in the East African Rift Valley. We have compared this record with fish fossil isotopes from both a previously published study of a Lake Malawi drill core (139 ka–present) and core top (modern ca 1978) samples collected at the water/sediment boundary from Lake Turkana (Kenya) of known environmental provenance. Both the Lake Malawi drill core fossils (−7.2‰ to −27.5‰ VPDB) and modern Lake Turkana samples (−16‰ to −24.6‰ VPDB) have δ13C values indicating a mix of near-shore and deep-water pelagic species. In contrast, the δ13C values for the Tugen Hills core fossils vary only between −20‰ and −27‰ VPDB. The absence of δ13C values greater than −19‰, suggests none of these fossils are derived from near-shore benthic habitats. The lack of shallow water, benthic lacustrine fish fossils through the Tugen Hills lake cycles may indicate that the rate of change from low-lake stands to deeper lake phases was very rapid, and shallow water communities were not established for long enough to leave a fish fossil record at the core site. These results strongly suggest that lake level responses to climate variability in the Baringo basin of the East African Rift were very abrupt during the Plio-Pleistocene transition.",
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T1 - δ13C records from fish fossils as paleo-indicators of ecosystem response to lake levels in the Plio-Pleistocene lakes of Tugen Hills, Kenya

AU - Billingsley, Anne L.

AU - Reinthal, Peter

AU - Dettman, David L.

AU - Kingston, John D.

AU - Deino, Alan L.

AU - Ortiz, Kevin

AU - Mohler, Benjamin

AU - Cohen, Andrew

PY - 2019/11/15

Y1 - 2019/11/15

N2 - The carbon isotopic ratios of organic matter in fish fossils from diatomites and other lake beds in the HSPDP drill core from Tugen Hills, Kenya (2.56–3.29 Ma) reflect trophic resource uses, and can indicate the dietary habitats of fish in the paleolake. This information offers insight into how fish communities responded to lake-level fluctuations during the Plio-Pleistocene in the East African Rift Valley. We have compared this record with fish fossil isotopes from both a previously published study of a Lake Malawi drill core (139 ka–present) and core top (modern ca 1978) samples collected at the water/sediment boundary from Lake Turkana (Kenya) of known environmental provenance. Both the Lake Malawi drill core fossils (−7.2‰ to −27.5‰ VPDB) and modern Lake Turkana samples (−16‰ to −24.6‰ VPDB) have δ13C values indicating a mix of near-shore and deep-water pelagic species. In contrast, the δ13C values for the Tugen Hills core fossils vary only between −20‰ and −27‰ VPDB. The absence of δ13C values greater than −19‰, suggests none of these fossils are derived from near-shore benthic habitats. The lack of shallow water, benthic lacustrine fish fossils through the Tugen Hills lake cycles may indicate that the rate of change from low-lake stands to deeper lake phases was very rapid, and shallow water communities were not established for long enough to leave a fish fossil record at the core site. These results strongly suggest that lake level responses to climate variability in the Baringo basin of the East African Rift were very abrupt during the Plio-Pleistocene transition.

AB - The carbon isotopic ratios of organic matter in fish fossils from diatomites and other lake beds in the HSPDP drill core from Tugen Hills, Kenya (2.56–3.29 Ma) reflect trophic resource uses, and can indicate the dietary habitats of fish in the paleolake. This information offers insight into how fish communities responded to lake-level fluctuations during the Plio-Pleistocene in the East African Rift Valley. We have compared this record with fish fossil isotopes from both a previously published study of a Lake Malawi drill core (139 ka–present) and core top (modern ca 1978) samples collected at the water/sediment boundary from Lake Turkana (Kenya) of known environmental provenance. Both the Lake Malawi drill core fossils (−7.2‰ to −27.5‰ VPDB) and modern Lake Turkana samples (−16‰ to −24.6‰ VPDB) have δ13C values indicating a mix of near-shore and deep-water pelagic species. In contrast, the δ13C values for the Tugen Hills core fossils vary only between −20‰ and −27‰ VPDB. The absence of δ13C values greater than −19‰, suggests none of these fossils are derived from near-shore benthic habitats. The lack of shallow water, benthic lacustrine fish fossils through the Tugen Hills lake cycles may indicate that the rate of change from low-lake stands to deeper lake phases was very rapid, and shallow water communities were not established for long enough to leave a fish fossil record at the core site. These results strongly suggest that lake level responses to climate variability in the Baringo basin of the East African Rift were very abrupt during the Plio-Pleistocene transition.

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KW - Fish habitats

KW - Fish paleoecology

KW - Isotopic geochemistry

KW - Plio-Pleistocene climate

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