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Spatial Distribution of Fish Larvae in a Bay of the Gulf of California (June and November 1997)

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Title:Spatial Distribution of Fish Larvae in a Bay of the Gulf of California (June and November 1997)
Authors:Peguero-Icaza, Martha
Sanchez-Velasco, Laura
Date Issued:Oct 2004
Publisher:University of Hawai'i Press
Citation:Peguero-Icaza M, Sanchez-Velasco L. 2004. Spatial distribution of fish larvae in a bay of the Gulf of California (June and November 1997). Pac Sci 58(4): 567-578.
Abstract:Bahia Concepcion is one of the largest coastal bodies of water on the
peninsular side of the Gulf of California, which is characterized by great fish
species diversity. Spatial distributions of fish larvae in Bahia Concepcion during
June and November 1997 were analyzed; these months were representative
of the extreme hydrographic conditions during an annual cycle in the Gulf.
Zooplankton samples (333-(mu)m conical net) and conductivity, temperature, and
depth data were obtained at each sampling station. The Bray-Curtis dissimilarity
index defined three groups of stations in June (mouth, central, and interior) and
two in November (mouth and central-interior), which vary in species composition
and dominance. In June, Gerreidae (Eucinostomus gracilis) and Clupeidae
(Opisthonema sp.) larvae were the dominant species in the bay mouth; Sciaenidae
type 1, Clupeidae (Harengula thrissina), and Pomacentridae (Stegastes rectifraenum)
larvae were the dominant species in the central bay; and Gerreidae (E.
dowii) larvae in the bay interior. The differentiation of three groups is associated
with variations in hydrographic conditions recorded from the mouth to the bay
interior, coinciding with a well-defined thermocline throughout the bay as a
result of weak winds prevailing in the central Gulf region. In November, Mullidae
and Clupeidae (Etrumeus teres) larvae were the dominant taxa in the bay
mouth, and Gobiidae (Ilypnus gilberti) and Blenniidae (Hypsoblennius gentilis)
larvae dominated in the central and interior bay. The similarity of the larval
composition of the central and interior bay is associated with a straight spatial
gradient of temperature and salinity and homogeneity in the water column; this
condition was caused by strong winds and tides that affect the region in late fall.
In addition, the presence of mesopelagic species (e.g., Vinciguerria lucetia) in the
bay interior during November indicates a clear influence of the Gulf waters in
the bay at that time, possibly as a result of intensive mixing.
Appears in Collections: Pacific Science Volume 58, Number 4, 2004

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