Verdugo-Díaz, G., A., Martínez-López & F.J., Gómez-Ochoa (2021). Characterization of the trophic status (spring-summer) of the El Conchalito estuary, BCS, based on the concentration of chlorophyll a, primary productivity, and photosynthetic efficiency. J., De La Cruz-Agüero (Eds.), CICIMAR Oceánides. 36(1-2): 59-64. DOI: 10.37543/oceanides.v36i1-2.260.
Gerardo Verdugo-Díaz 1, Aída Martínez-López 2 y Francisco Javier Gómez-Ochoa 2
Mangroves are one of the most important wetland systemsbecause of the widely-recognized and essential ecologicaland economic role they play (Kuo et al., 2001) by functioning as areas of alimentation, refuge and breeding ofMangroves are one of the most important wetland systems because of the widely-recognized and essential ecological and economic role they play (Kuo et al., 2001) by functioning as areas of alimentation, refuge and breeding of numerous species of birds (Carmona & Carmona, 2000), fish (Gonza´lez-Acosta et al., 1999; Gonza´lez-Acosta et al., 2005), mollusks (Conabio, 2008), and crustaceans (Fe´lix-Pi- co et al., 2003), among others. The El Conchalito mangrove (Fig. 1) is a system formed basically by three species that, in order of importance, are Avicennia germinans, Laguncularia racemosa and Rhizophora mangle. This mangrove is located near Ensenada de La Paz (24o08'34”-24o07'40'' N and 110o21'04''-110o20'35''W) and covers an approximate surface area of 18.5 has. The principal rains occur in the summer with values close to 60 mm, while the mean annual precipitation is 184 mm. This system is subject to a desert climate with a mean annual temperature above 22°C. During the winter-spring, winds come from the northwest at speeds of 5-10 m s-1 but are weaker in the hot months (2-3 m s-1) when they enter from the south. The objective of the present study was to evaluate the trophic condition of this estuary based on the variables of chlorophyll-a concentration, primary productivity and photosynthetic efficiency in a mangrove area that borders on a residential zone of the city La Paz, BCS. Nine, two-week sampling periods were performed between April and July 2016, which involved in situ recording of ambient temperature and the surface temperature of the water. Water samples were drawn at the estuary’s mouth to determine chlorophyll-a concentrations (Strickland & Parsons, 1972) and estimate primary productivity employing the radioactive carbon assimilation technique (Steemann-Nielsen, 1952).
Palabras clave: Mangroves; chlorophyll-a; Primary productivity; trophic condition
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