Nutrient dynamics in the west arm of San Quintín Bay, Baja California, Mexico, during and after El Niño 1997/1998

Nutrient dynamics in the west arm of San Quintín Bay, Baja California, Mexico, during and after El Niño 1997/1998

 Time series of 8 h (May, September and November 1997, and March 1998) and 24 h (June and September 1999, and February 2000) were carried out at two (1997–1998) or three sites (1999–2000) of the west arm (Falsa Bay, FB) of San Quintín Bay, in order to assess the nutrient dynamics during and...

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Główni autorzy: Hernández-Ayón, JM, Galindo-Bect, S, Camacho-Ibar, V, García-Esquivel, Z, González-Gómez, MA, Ley-Lou, F
Format: info:eu-repo/semantics/article
Język:eng
Wydane: Iniversidad Autónoma de Baja California 2004
Hasła przedmiotowe:
San Quintín Bay
upwelling
nutrients
budget
El Niño
net metabolism
Bahía San Quintín
surgencias
nutrientes
balances
metabolismo neto
Dostęp online:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/115
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id repositorioinstitucional-20.500.12930-7347
record_format dspace
institution Repositorio Institucional
collection DSpace
language eng
topic San Quintín Bay
upwelling
nutrients
budget
El Niño
net metabolism
Bahía San Quintín
surgencias
nutrientes
balances
El Niño
metabolismo neto
spellingShingle San Quintín Bay
upwelling
nutrients
budget
El Niño
net metabolism
Bahía San Quintín
surgencias
nutrientes
balances
El Niño
metabolismo neto
Hernández-Ayón, JM
Galindo-Bect, S
Camacho-Ibar, V
García-Esquivel, Z
González-Gómez, MA
Ley-Lou, F
Nutrient dynamics in the west arm of San Quintín Bay, Baja California, Mexico, during and after El Niño 1997/1998
description  Time series of 8 h (May, September and November 1997, and March 1998) and 24 h (June and September 1999, and February 2000) were carried out at two (1997–1998) or three sites (1999–2000) of the west arm (Falsa Bay, FB) of San Quintín Bay, in order to assess the nutrient dynamics during and after the 1997/1998 El Niño event. Chlorophyll a concentrations were also determined during each time series. Non-conservative fluxes of dissolved inorganic phosphorus (∆DIP), dissolved inorganic nitrogen (∆DIN), nitrates (NO3–) and ammonium (∆NH4+) were estimated using a nutrient budget model. High NH4+ peaks (18–45 µM) were detected during El Niño 1997/1998, and the mean concentration values were higher than those of 1999–2000. Ammonium concentration was consistently less than 8 µM during 1999–2000. Significant correlations (r = 0.60 to 0.80) were found between tidal height and NO3– concentration in 1999–2000, as well as an inverse relationship between nitrates and salinity, thus reflecting the input of new DIN from the ocean. Chlorophyll a concentration was up to two times higher in 1999–2000 than during El Niño. There were no significant correlations between tidal height and nutrient concentration during 1997–1998, suggesting that: (a) the high NH4+ concentrations found in 1997–1998 were due to in situ remineralization of the organic matter and, possibly, the excretion by cultured mollusc bivalves in FB, and (b) the increase of chlorophyll a and NO3– during 1999–2000 was mainly due to new inputs from the adjacent ocean. The positive ∆DIP values (0.1 to 0.57) and negative values of the net ecosystem metabolism (NEM = –1 to –60 mmol m–2 d–1) observed throughout 1997–2000 indicate that FB permanently exported DIP towards the ocean and behaved as a net heterotrophic system, with or without the presence of El Niño.
format info:eu-repo/semantics/article
author Hernández-Ayón, JM
Galindo-Bect, S
Camacho-Ibar, V
García-Esquivel, Z
González-Gómez, MA
Ley-Lou, F
author_facet Hernández-Ayón, JM
Galindo-Bect, S
Camacho-Ibar, V
García-Esquivel, Z
González-Gómez, MA
Ley-Lou, F
author_sort Hernández-Ayón, JM
title Nutrient dynamics in the west arm of San Quintín Bay, Baja California, Mexico, during and after El Niño 1997/1998
title_short Nutrient dynamics in the west arm of San Quintín Bay, Baja California, Mexico, during and after El Niño 1997/1998
title_full Nutrient dynamics in the west arm of San Quintín Bay, Baja California, Mexico, during and after El Niño 1997/1998
title_fullStr Nutrient dynamics in the west arm of San Quintín Bay, Baja California, Mexico, during and after El Niño 1997/1998
title_full_unstemmed Nutrient dynamics in the west arm of San Quintín Bay, Baja California, Mexico, during and after El Niño 1997/1998
title_sort nutrient dynamics in the west arm of san quintín bay, baja california, mexico, during and after el niño 1997/1998
publisher Iniversidad Autónoma de Baja California
publishDate 2004
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/115
_version_ 1792610212289445888
spelling repositorioinstitucional-20.500.12930-73472023-05-09T14:30:57Z Nutrient dynamics in the west arm of San Quintín Bay, Baja California, Mexico, during and after El Niño 1997/1998 Dinámica de los nutrientes en el brazo oeste de Bahía San Quintín, Baja California, México, durante y después de El Niño 1997/1998 Hernández-Ayón, JM Galindo-Bect, S Camacho-Ibar, V García-Esquivel, Z González-Gómez, MA Ley-Lou, F San Quintín Bay upwelling nutrients budget El Niño net metabolism Bahía San Quintín surgencias nutrientes balances El Niño metabolismo neto  Time series of 8 h (May, September and November 1997, and March 1998) and 24 h (June and September 1999, and February 2000) were carried out at two (1997–1998) or three sites (1999–2000) of the west arm (Falsa Bay, FB) of San Quintín Bay, in order to assess the nutrient dynamics during and after the 1997/1998 El Niño event. Chlorophyll a concentrations were also determined during each time series. Non-conservative fluxes of dissolved inorganic phosphorus (∆DIP), dissolved inorganic nitrogen (∆DIN), nitrates (NO3–) and ammonium (∆NH4+) were estimated using a nutrient budget model. High NH4+ peaks (18–45 µM) were detected during El Niño 1997/1998, and the mean concentration values were higher than those of 1999–2000. Ammonium concentration was consistently less than 8 µM during 1999–2000. Significant correlations (r = 0.60 to 0.80) were found between tidal height and NO3– concentration in 1999–2000, as well as an inverse relationship between nitrates and salinity, thus reflecting the input of new DIN from the ocean. Chlorophyll a concentration was up to two times higher in 1999–2000 than during El Niño. There were no significant correlations between tidal height and nutrient concentration during 1997–1998, suggesting that: (a) the high NH4+ concentrations found in 1997–1998 were due to in situ remineralization of the organic matter and, possibly, the excretion by cultured mollusc bivalves in FB, and (b) the increase of chlorophyll a and NO3– during 1999–2000 was mainly due to new inputs from the adjacent ocean. The positive ∆DIP values (0.1 to 0.57) and negative values of the net ecosystem metabolism (NEM = –1 to –60 mmol m–2 d–1) observed throughout 1997–2000 indicate that FB permanently exported DIP towards the ocean and behaved as a net heterotrophic system, with or without the presence of El Niño. Se realizaron series de tiempo de 8 h (mayo, septiembre y noviembre de 1997, y Marzo de 1998) y de 24 h (junio y septiembre de 1999, y febrero de 2000) en dos (1997–1998) y tres localidades (1999–2000) del brazo oeste de Bahía San Quintín (Bahía Falsa, BF), con el fin de describir la dinámica de los nutrientes durante y después del evento El Niño 1997/1998. La concentración de clorofila a también se evaluó en cada serie. Se estimaron los flujos no conservativos de fósforo inorgánico disuelto (∆PID), nitrógeno inorgánico disuelto (∆NID), nitratos (∆NO3 –) y amonio (∆NH4+), utilizando un modelo de balance de nutrientes. Durante El Niño 1997/1998 se detectaron pulsos de NH4+ entre 18 y 45 µM, y concentraciones medias más altas que en 1999–2000. La concentración de NH4+ fue consistentemente menor de 8 µM en 1999–2000. Se observaron correlaciones significativas (r = 0.60 a 0.80) entre la altura de la marea y la concentración de NO3– en 1999–2000, y una relación inversa entre NO3– y salinidad, lo que reflejó un aporte oceánico de NID nuevo. La concentración de clorofila a fue hasta dos veces más alta en 1999–2000 que durante El Niño. No se observaron correlaciones significativas entre la marea y la concentración de nutrientes en 1997–1998, lo que se sugiere que: (a) las concentraciones altas de NH4+ en 1997–1998 se debieron a la remineralización in situ de la materia orgánica y posiblemente a la excreción de moluscos bivalvos presentes en BF, y (b) el aumento de clorofila a y NO3– observados en 1999–2000 se debieron principalmente a aportes nuevos desde el océano adyacente. La combinación de valores positivos de ∆PID (0.1 a 0.57) y negativos del metabolismo neto del ecosistema (MNE = –1 a –60 mmol m–2 d–1) durante 1997–2000, indican que BF exportó permanentemente PID hacia el océano y actuó como un sistema heterótrofo neto en presencia y ausencia de El Niño. 2004-03-06 2021-06-03T03:54:59Z 2021-06-03T03:54:59Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/115 10.7773/cm.v30i11.115 https://hdl.handle.net/20.500.12930/7347 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/115/94 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 30 No. 1A (2004); 119-132 Ciencias Marinas; Vol. 30 Núm. 1A (2004); 119-132 2395-9053 0185-3880

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