JEB logo

Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

About Journal
    Editor in Chief
    Editorial Board
    Reviewer Panel
    Publication Policies
    Guidelines for Editors
    Guidelines for Reviewers
    Abstracting and Indexing
    Subscription and Payments
    Contact Journal
Read Journal
    Current Issue
    Journal Archives
For Authors
    Guidelines for Authors
    Terms and Conditions
    Fees and Payments
    Track Paper Status
    JEB Awards

Google Search the Journal web-site:

    Abstract - Issue July 2011, 32 (4)                                     Back

nstantaneous and historical temperature effects on a-pinene

Chaetognatha in the Bah?a Magdalena lagoon complex, Baja

California Sur, m?xico: Species composition and assemblages


Author Details


M.S. Cota Meza (Corresponding author)

Centro Interdisciplinario de Ciencias Marinas (CICIMAR-IPN). Laboratorio de Plancton y Ecolog?a

Marina. A. P. 476, La Paz BCS, M?xico




Publication Data

Paper received:

31 August 2009


Revised received:

17 July 2010



23 September 2010



The chaetognaths from 187 zooplankton samples collected from the Bah?a Magdalena lagoon complex, Baja California Sur, M?xico during March, June, July, August, September, November, and December 1982 were studied. Twelve species belonging to two genera were identified. Sagitta euneritica and S. enflata were the most abundant and most frequent species with maximum abundance? in July (40,000 org/100 m3 and 6100 org/100 m3 respectively). Sagitta pacifica, S. regularis and S. pseudoserratodentata were stenothermic (21 to 25oC), whereas the rest of the species were eurythermic (15.5 to 29.5oC). Sagitta euneritica contributed considerably to the zooplanktonic biomass, increasing the density in particular in Bah?a Almejas.? The analysis of the species assemblages (Morisita index) showed that S. pacifica and S. regularis interact more frequently in August when there is a change of the water masses that converge in this zone during summer, when the California Countercurrent predominates. The composition of taxa during winter is characterized by the dominance of S. euneritica. Entering the warm period, an abrupt change occurs in taxa composition of the three zones studied: channels, Bah?a Magdalena, and Bah?a Almejas. The amplitude and distribution of S. peruviana was influenced possibility by the oceanographic conditions of ENSO 1982.

Key words

Chaetognaths assemblages, Seasonality, ENSO, Bahia magdalena, Mexico


Copyright ? 2011 Triveni Enterprises. All rights reserved. No part of the Journal can be reproduced in any form without prior permission. Responsibility regarding the authenticity of the data, and the acceptability of the conclusions enforced or derived, rest completely with the author(s).