Sustainability of Coastal Resource Use in San Quintin, Mexico

Aguirre-Muñoz, Alfonso; Buddemeier, Robert W.; Camacho-Ibar, Víctor F.; Carriquiry, José D.; Ibarra-Obando, Silvia E.; Massey, Barbara W.; Smith, Stephen V.; Wulff, Fredrik

doi:10.1639/0044-7447(2001)030[0142:socrui]2.0.co;2

Cited by 14 publications

(29 citation statements)

References 3 publications

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“…On the other hand, shellfish farming is one of the most important activities in San Quintín Bay where oysters are grown using rack systems (Aguirre-Muñoz et al 2001). Eelgrass mats below these racks have declined significantly (pers.…”

Section: Discussionmentioning

confidence: 99%

Effects of sulfide concentration, pH, and anoxia on photosynthesis and respiration of Zostera marina

Korhonen¹,

Macías-Carranza²,

Abdala

et al. 2012

Cienc. Mar.

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ABSTRACT. Sulfide produced in marine sediments by sulfate reduction is toxic for several macrophytes, and high sediment sulfide concentrations have been associated with seagrass die-off events. Sulfide has been shown to reduce growth in a number of seagrasses, but little is known about its effect on the photosynthetic and respiratory metabolism. Consequently, the aim of this research was to evaluate the effect of sulfide on photosynthesis and respiration of the seagrass Zostera marina. Photosynthetic oxygen evolution and respiration were determined polarographically, while the optimum quantum yield was used as a measure of the photosynthetic performance of photosystem II in the leaves of Z. marina. The results showed that sulfide concentrations of approximately 1000 M could be considered an upper threshold limit for the survival of Z. marina in the coastal lagoons of Baja California (Mexico) studied. Respiration was not inhibited by sulfide concentrations up to 1000 M during 48-h incubations, while photosynthetic performance was reduced by short exposure to sulfide concentrations of 25 M but also by long exposure to concentrations as low as 50 M. This is the first study that shows that the photosynthetic capacity of Z. marina is not recovered once the sulfide-free conditions have been re-established.Key words: aerobic respiration, optimum quantum yield, sulfide, photosynthesis, Zostera marina. RESUMEN.El sulfuro producido en los sedimentos a consecuencia de la reducción del sulfato es tóxico para algunas macrófitas. De la misma manera, altas concentraciones de sulfuro en el sedimento han sido asociadas con eventos de mortalidad en pastos marinos. Se ha observado que la presencia de sulfuro reduce el crecimiento en algunos pastos marinos; sin embargo, el efecto sobre el metabolismo fotosintético y respiratorio es poco conocido. En consecuencia, el objetivo de esta investigación fue evaluar el efecto de sulfuro sobre la fotosíntesis y la respiración de la fanerógama marina Zostera marina. La evolución del oxígeno fotosintético y la respiración fueron determinados polarográficamente, en tanto que el rendimiento cuántico óptimo fue utilizado como una medida del desempeño fotosintético del fotosistema II en las hojas de Z. marina. Los resultados mostraron que las concentraciones de sulfuro cercanas a 1000 M pueden ser consideradas como el límite superior para la supervivencia de Z. marina en las lagunas costeras de Baja California (México) consideradas en este estudio. La respiración no presentó inhibición cuando las plantas fueron expuestas a concentraciones de sulfuro de 1000 M durante incubaciones de 48 h, mientras que el desempeño fotosintético disminuyó al ser expuestas a concentraciones de 25 M por cortos periodos de tiempo, pero también a exposiciones prolongadas en concentraciones de tan solo 50 M. Este es el primer estudio que muestra que la capacidad fotosintética de Z. marina no se recupera una vez que las condiciones libres de sulfuro son restablecidas.Palabras clave: respiración aeróbica, rendimi...

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Section: Discussionmentioning

confidence: 99%

Effects of sulfide concentration, pH, and anoxia on photosynthesis and respiration of Zostera marina

Korhonen¹,

Macías-Carranza²,

Abdala

et al. 2012

Cienc. Mar.

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“…Whole-system net biogeochemical characteristics have been described by Camacho-Ibar et al (2003), and characteristics of anthropogenic use of the bay and its interaction with the adjacent land are described by Aguirre-Muñoz et al (2001).…”

Section: Methodsmentioning

confidence: 99%

“…San Quintin Bay and Tomales Bay are under rather similar hydrographic and weather regimes due to the presence of upwelling and classical Mediterranean climate (cool, wet winters; hot, dry summers) , Aguirre-Muñoz et al 2001). The primary difference is the absence of runoff into San Quintin compared to low, but significant, runoff into Tomales.…”

Section: Comparison Between San Quintin and Tomales Baysmentioning

confidence: 99%

Benthic metabolism in San Quintin Bay, Baja California, Mexico

Ibarra-Obando

Smith²,

Poumian-Tapia³

et al. 2004

Mar. Ecol. Prog. Ser.

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“…Industries such as aquaculture are currently operating in SQB at a sustainable rate (Aguirre-Muñoz et al 2001, Correa et al 2004, García-Esquivel et al 2004; however, the cover of Zostera marina meadows has declined by 14% (mainly in subtidal zones) over the last 2 decades (Ward et al 2004a,b). This habitat fragmentation reduces the size and increases the spatial isolation of plant populations, and decreases the effective population size thus leading to bottlenecks.…”

Section: Introductionmentioning

confidence: 99%

Genetic structure of eelgrass Zostera marina meadows in an embayment with restricted water flow

Muñíz-Salazar¹,

Talbot²,

Sage³

et al. 2006

Mar. Ecol. Prog. Ser.

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Genetic structure of the seagrass Zostera marina in a coastal lagoon with restricted water flow, and with heterogeneous water residence times and oceanographic characteristics, was assessed using 8 polymorphic microsatellite loci. Analyses of genetic differentiation (θ) and Bayesian clustering suggested that the Z. marina population in San Quintin Bay (SQB) is genetically substructured, with at least 4 genetically different groups: (1) West Head, (2) Mouth, (3) East Arm, and (4) East Head. The greatest θ value was observed between the most distant sites (θ = 0.095). The lowest values were found among sites closest to the mouth of the coastal lagoon (θ = 0.000 to 0.009). The maximum likelihood approach showed that the sites at the mouth have a mixed pattern of gene flow without a unidirectional pattern. In contrast, there was a clear pattern of asymmetrical gene flow from the mouth towards the West Head. These results suggested that the restriction of water flow at the heads, current pattern, and the distance between sites can reduce genetic flow and promote genetic differences within Z. marina meadows in small water embayments such as SQB. Though the population is genetically substructured and a 14% decline in cover has been detected, this study did not show evidence of a recent genetic bottleneck. In contrast, mouth sites have experienced a recent expansion in their population size, and also perhaps a recent influx of rare alleles from genetically distinct immigrants.

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Sustainability of Coastal Resource Use in San Quintin, Mexico

Cited by 14 publications

References 3 publications

Effects of sulfide concentration, pH, and anoxia on photosynthesis and respiration of Zostera marina

Effects of sulfide concentration, pH, and anoxia on photosynthesis and respiration of Zostera marina

Benthic metabolism in San Quintin Bay, Baja California, Mexico

Genetic structure of eelgrass Zostera marina meadows in an embayment with restricted water flow

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