Temperature, Salinity, Nutrients And Chlorophyll a In Coastal Waters Of The Southern California Bight

Carreón, T. Leticia Espinosa; Castro, Gilberto Gaxiola; Pacheco, José María Robles; Martínez, Sila Nájera

doi:10.7773/cm.v27i3.490

Cited by 22 publications

(11 citation statements)

References 20 publications

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“…Sediment transport into and within the bay follows the same circulation pattern [25]. The bay is under the upwelling influence during periods of NW winds, a prominent feature of much of the Pacific coast of the USA and northern Baja California [26], and some authors have documented the influence of the local upwelling on water properties near the mouth during the springtime upwelling period [22] [27].…”

Section: Study Sitementioning

confidence: 95%

Presence of Sargassum horneri at Todos Santos Bay, Baja California, Mexico: Its Effects on the Local Macroalgae Community

Cruz-Trejo¹,

Ibarra-Obando

Aguilar-Rosas³

et al. 2015

AJPS

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To describe the annual cycle of Sargassum horneri in Mexican waters, we selected two sites differing in their degree of wave exposure and sediment type: Rincón de Ballenas (RB), and Rancho Packard (RP). From June 2009 to April 2010 we followed the seasonal changes in S. horneri density and biomass along two intertidal transects per site. The effects of this non-indigenous species on the local macroalgae community were assessed by comparing their species composition, density, biomass, species richness, and diversity index in quadrats with and without S. horneri. There were significant differences in S. horneri density and biomass between sites (P < 0.001). At RB the invasive alga density average was 2 ± 0.94 individual m −2 , with a mean biomass of 4 ± 0.95 g DW m −2. At RP, S. horneri density average was 10 ± 0.96 individual m −2 , and mean biomass of 102 ± 0.97 g DW m −2. At RB, the invasive alga promoted a significant reduction in the four selected structural variables, and the corticated macrophytes and the foliose functional forms were severely reduced. At RP, there were only marginally significant effects (P = 0.06) of S. horneri presence on the local macroalgae community, and higher density, biomass, and diversity values were found when S. horneri was present. Most of the functional forms were found, even if the invasive alga was present. At both locations, the highest biomass corresponded to the articulated calcareous functional form. These contrasting results could be due to the fact that the native macroalgae community has already been altered by the early invasion of S. muticum, with the most resilient species and functional forms remaining in place. One of the most important changes we noticed is the severe reduction of the canopy forming species at both sites.

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Section: Study Sitementioning

confidence: 95%

Presence of Sargassum horneri at Todos Santos Bay, Baja California, Mexico: Its Effects on the Local Macroalgae Community

Cruz-Trejo¹,

Ibarra-Obando

Aguilar-Rosas³

et al. 2015

AJPS

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“…Outside of TSB, northwesterly winds also cause an offshore Ekman transport that results in year-round upwelling of cold, relatively saline and nutrientrich waters (Zaytsev et al, 2003); however, the magnitude and frequency of coastal upwelling are higher in the spring and summer (Gómez-Valdéz, 1983;Pérez-Brunius et al, 2007). Upwelling events and fluctuations in the flow of the California Current control the physical and chemical variability of the water column (i.e., salinity, temperature, and nutrients; Espinosa-Carreón et al, 2001;Pérez-Brunius et al, 2006;Linacre et al, 2010), primary production rates (Espinosa-Carreón et al, 2001, as well as the occurrence of algal blooms both outside and inside TSB, with a high likelihood of toxic blooms inside the bay (Peña-Manjarrez et al, 2005;García-Mendoza et al, 2009;Berdalet et al, 2014).…”

Section: Description Of the Study Sitementioning

confidence: 99%

Seasonal behavior of dissolved cadmium and Cd/PO4 ratio in Todos Santos Bay: A retention site of upwelled waters in the Baja California peninsula, Mexico

et al. 2015

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“…Las concentraciones medias de nutrientes fueron de 3.31 µM para el DIN y de 0.83 µM para el DIP. Sin embargo, antes de los florecimientos y durante la primavera de cada año, a Different local sources of DIP and DIN exist in TSB: coastal upwelling waters transported to the inner bay (Espinosa-Carreón 2001, Segovia-Zavala et al 2007, sewage from the city of Ensenada (Segovia-Zavala et al 1988), runoff during the rainy season, debris from tuna farms, and oyster and mussel cultures. Altogether they contribute to maintain DIP and DIN at non-limiting concentrations for the development of blooms.…”

Section: Discussionmentioning

confidence: 99%

“…Existen diferentes fuentes locales de DIP y DIN en la BTS: agua de surgencias costeras transportadas al interior de la bahía (Espinosa-Carreón et al 2001, Segovia-Zavala et al 2007; aguas residuales vertidas desde la ciudad de Ensenada (Segovia-Zavala et al 1988); escorrentías durante la temporada de lluvias; desechos de las granjas de atún, así como los cultivos de mejillón y ostión. En conjunto estos flujos contribuyen a mantener altas concentraciones de DIN y DIP, por lo que en consecuencia no existen limitaciones de estos recursos para el desarrollo de los florecimientos.…”

Section: Discussionunclassified

Environmental factors influencing the variability of Lingulodinium polyedrum and Scrippsiella trochoidea (Dinophyceae) cyst production

Peña-Manjarrez¹,

Gaxiola‐Castro

Helenes-Escamilla

2009

Cienc. Mar.

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This study analyzes the temporal variability of the abundance of Lingulodinium polyedrum and Scrippsiella trochoidea resting cysts in surface sediments, as well as the temporary cysts and vegetative cells of L. polyedrum in the upper water column of Todos Santos Bay (Baja California, Mexico). Samples were collected monthly from January 2002 to June 2005 at four sites. Multidimensional scaling analysis and analysis of similarities revealed that resting cysts are distributed heterogeneously according to the sedimentary environment. Surface water temperature, inorganic dissolved phosphate, and the abundance of temporary cysts were the main factors influencing the abundance of L. polyedrum resting cysts, while the variability of temporary cysts was explained by the abundance of planktonic cells. Scrippsiella trochoidea resting cysts showed no statistical relationship with the environmental factors considered. Local runoff during the rainy season and sewage from the city of Ensenada contribute to the eutrophication of the bay. This is an important factor for future blooms since inorganic dissolved nitrate + nitrite and daylight hours during the spring-summer season are not limiting factors for dinoflagellate growth. After the dinoflagellate blooms, there was massive cyst production of both species, and the new cysts settled on the surface sediments. Surface water temperatures between 17°C and 22.5°C during spring-summer appear to trigger excystment in these species.

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Temperature, Salinity, Nutrients And Chlorophyll a In Coastal Waters Of The Southern California Bight

Cited by 22 publications

References 20 publications

Presence of Sargassum horneri at Todos Santos Bay, Baja California, Mexico: Its Effects on the Local Macroalgae Community

Presence of Sargassum horneri at Todos Santos Bay, Baja California, Mexico: Its Effects on the Local Macroalgae Community

Seasonal behavior of dissolved cadmium and Cd/PO4 ratio in Todos Santos Bay: A retention site of upwelled waters in the Baja California peninsula, Mexico

Environmental factors influencing the variability of Lingulodinium polyedrum and Scrippsiella trochoidea (Dinophyceae) cyst production

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