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Botanica Marina

Editor-in-Chief: Dring, Matthew J.

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Volume 55, Issue 2 (Apr 2012)

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Climate variability and silicoflagellate fluxes in Alfonso Basin (southern Gulf of California)

Aída Martínez-López
  • Centro Interdisciplinario de Ciencias Marinas del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional s/n Col. Playa Palo de Santa Rita, Apartado Postal 592, La Paz, Baja California Sur 23096, Mexico
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/ Irela G. Álvarez-Gómez
  • Centro Interdisciplinario de Ciencias Marinas del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional s/n Col. Playa Palo de Santa Rita, Apartado Postal 592, La Paz, Baja California Sur 23096, Mexico
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/ Reginaldo Durazo
  • Facultad de Ciencias Marinas, Universidad Autónoma de Baja California, Km. 103 Carretera Tijuana-Ensenada, Apartado Postal 453, Ensenada, Baja California 22860, Mexico
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Published Online: 2012-03-08 | DOI: https://doi.org/10.1515/bot-2012-0101

Abstract

We conducted a study from January 2002 to February 2008 on silicoflagellate fluxes in Alfonso Basin at the entrance to the Gulf of California. Thirteen taxa were identified in sediment trap samples, with Octactis pulchra as the dominant species. Total flux climatology reached a maximum value of 5×106 skeletons m-2 day-1 in December and then sharply decreased to a minimum value in February (2.3×103 skeletons m-2 day-1) concurrently with the climatological sea surface temperature (SST) minimum. Subsequently, there was a positive trend with a second relative maximum of 1.6×106 skeletons m-2 day-1 in September coincident with a maximum in climatological SST. During this period, there was a similar increase to 1.4×106 skeletons m-2 day-1 in May. Factor analysis identified three patterns of variation: “subtropical oceanic,” “subarctic,” and “equatorial El Niño.” Factors had reasonable correlations with the Pacific decadal oscillation (PDO), North Pacific Gyre oscillation (NPGO), and El Niño Modoki indices (r=0.53, 0.67, and 0.63, respectively). The first and second modes were apparently linked to decadal climatic conditions correlated to PDO and NPGO, as suggested by the silicoflagellate species Dictyocha messanensis forma messanensis and the assemblage of D. epiodon and Distephanus speculum, respectively; the third mode was related to the presence of warm equatorial-oceanic waters identified by D. messanensis forma spinosa, which defines El Niño influence. These results demonstrate the importance of the region where there is a confluence of the low-frequency, high-latitude PDO, NPGO, and high-frequency El Niño signals.

Keywords: climate variability; Gulf of California; interannual variability; seasonal pattern; silicoflagellates; subtropical region

About the article

Corresponding author


Received: 2011-08-03

Accepted: 2012-02-06

Published Online: 2012-03-08

Published in Print: 2012-04-01


Citation Information: Botanica Marina, ISSN (Online) 1437-4323, ISSN (Print) 0006-8055, DOI: https://doi.org/10.1515/bot-2012-0101.

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©2012 by Walter de Gruyter Berlin Boston. Copyright Clearance Center

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