Bioturbation rates in Bahía la Choya, Sonora, Mexico

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 fla...

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Egile Nagusiak:	Lynn-Myrick, J, Flessa, KW
Formatua:	Online
Hizkuntza:	eng
Argitaratua:	Iniversidad Autónoma de Baja California 1996
Sarrera elektronikoa:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/837
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spelling	oai:cienciasmarinas.com.mx:article-8372019-06-12T22:53:09Z Bioturbation rates in Bahía la Choya, Sonora, Mexico Razones de bioturbación en Bahía La Choya, Sonora, México Lynn-Myrick, J Flessa, KW bioturbation sediment reworking callianassid shrimp elasmobranch rays bioturbación retrabajamiento de sedimentos camarones calianásidos rayas 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. La determinación experimental de las razones de retrabajamiento en un ambiente de planicie de marea subtropical proporcionó información acerca de la cantidad, naturaleza e implicaciones del retrabajamiento de los sedimentos en depósitos próximos a la costa. Los camarones calianásidos en bahía La Choya, Sonora, México, revuelven el sedimento en las planicies interiores a una razón promedio de 0.56 m3/m2/año. Las rayas revuelven el sedimento en las planicies medias a una razón promedio de 1.01 m3/m2/año. Los moldes de resina indican que el camarón es capaz de enterrarse a una profundidad de al menos 1.15 m y, donde se presenta, puede completamente retrabajar este intervalo en bahía La Choya en dos años. Las rayas alcanzan una profundidad de enterramiento máxima observable de 20 cm y, donde se presentan, pueden completamente retrabajar este intervalo en bahía La Choya en 72 días. Las razones de retrabajamiento son lo suficientemente altas como para evitar, bajo condiciones normales, la preservación de la mayoría de las estructuras sedimentarias. Es probable que sólo las estructuras sedimentarias de gran escala, o aquellas enterradas profunda y rápidamente, escapen el retrabajamiento. Las razones de sedimentación biogénica por camarones calianásidos son lo suficientemente altas como para generar lechos de conchas subsuperficiales. La sedimentación biogénica a corto plazo es mayor que la de a largo plazo; esto indica que los sedimentos intermareales no sólo están totalmente retrabajados, sino que están incompletos a escalas de tiempo de semanas a meses. Iniversidad Autónoma de Baja California 1996-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/837 10.7773/cm.v22i1.837 Ciencias Marinas; Vol. 22 No. 1 (1996); 23-46 Ciencias Marinas; Vol. 22 Núm. 1 (1996); 23-46 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/837/760
institution	Ciencias Marinas
collection	OJS
language	eng
format	Online
author	Lynn-Myrick, J Flessa, KW
spellingShingle	Lynn-Myrick, J Flessa, KW Bioturbation rates in Bahía la Choya, Sonora, Mexico
author_facet	Lynn-Myrick, J Flessa, KW
author_sort	Lynn-Myrick, J
title	Bioturbation rates in Bahía la Choya, Sonora, Mexico
title_short	Bioturbation rates in Bahía la Choya, Sonora, Mexico
title_full	Bioturbation rates in Bahía la Choya, Sonora, Mexico
title_fullStr	Bioturbation rates in Bahía la Choya, Sonora, Mexico
title_full_unstemmed	Bioturbation rates in Bahía la Choya, Sonora, Mexico
title_sort	bioturbation rates in bahía la choya, sonora, mexico
description	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.
publisher	Iniversidad Autónoma de Baja California
publishDate	1996
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/837
_version_	1715724017479974912

Bioturbation rates in Bahía la Choya, Sonora, Mexico

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