Razones de bioturbación en Bahía la Choya, Sonora, México

Translated title of the contribution: Bioturbation rates in Bahía la Choya, Sonora, Mexico

J. Lynn Myrick, Karl W. Flessa

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Experimental determination of sediment reworking rates in a subtropical intertidal flat environment yielded information about the amount, nature and implications of sediment reworking in nearshore deposits. Callianassid shrimp in Bahía La Choya, Sonora, Mexico, overturn the sediment in the inner flats at an average rate of 0.56 m3/m2/year. Elasmobranch rays overturn the sediment in the midflats at an average rate of 1.01 m3/m2/year. Resin castings indicate that the shrimp are capable of burrowing to a depth of at least 1.15 m and, where present, can completely rework this interval in Bahía La Choya in two years. The rays reach a maximum observed burrowing depth of 20 cm and, where present, can completely rework this interval in Bahía La Choya in 72 days. Reworking rates are high enough to preclude the preservation of most physical sedimentary structures under normal conditions. Only large-scale sedimentary structures or those buried deeply and rapidly are likely to escape reworking. Rates of biogenic sedimentation by callianassid shrimp are high enough to generate subsurface shell beds. Short-term biogenic sedimentation rates are higher than long-term rates, indicating that such intertidal sediments are not only thoroughly reworked, but are incomplete at time scales of weeks to months.

Translated title of the contributionBioturbation rates in Bahía la Choya, Sonora, Mexico
Original languageSpanish
Pages (from-to)23-46
Number of pages24
JournalCiencias Marinas
Volume22
Issue number1
DOIs
StatePublished - 1996

Keywords

  • Bioturbation
  • Callianassid shrimp
  • Elasmobranch rays
  • Sediment reworking

ASJC Scopus subject areas

  • Aquatic Science

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