Qualitative Changes in Macroalgal Assemblages under Two Contrasting Climatic Conditions in a Subtropical Estuary

Ochoa-Izaguirre, María Julia; Carballo, José Luís; Páez‐Osuna, Federico

doi:10.1515/bot.2002.014

Cited by 28 publications

(30 citation statements)

References 10 publications

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“…Méndez (2002) characterized the lagoon through the study of annelids collected during 1997. This author confirmed the results related to organic pollution obtained by Álvarez-León (1980) with coastal vegetation and benthic flora and fauna, and by Ochoa-Izaguirre et al (2002) with macroalgae. Later, other characterizations of the lagoon were performed with benthic copepods collected in 2001) and 2005(Morales-Serna, 2006.…”

Section: Introductionsupporting

confidence: 88%

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Effects of organic pollution in the distribution of annelid communities in the Estero de Urías coastal lagoon, Mexico

Ferrando¹,

Méndez²

2010

Sci. Mar.

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SUMMARY: The Estero de Urías coastal lagoon is subjected to several anthropogenic activities and has been characterized since 1997 through the study of benthic fauna. We analyzed the spatial and temporal distribution of annelids and their relationships with environmental variables (depth, sediment temperature, grain size and organic matter) in order to determine the current degree of perturbation. Density, species richness, diversity, dominance, biomass, and the application of classification and ordination techniques allowed us to distinguish 5 zones: 1) a non-perturbed zone at the mouth of the lagoon, 2) a slightly perturbed zone surrounded by mangroves and shrimp farms, 3) a temporarily perturbed zone close to the effluent of the thermoelectric plant, 4) a perturbed zone in front of the slaughterhouse and fish factory, and 5) a very perturbed zone subjected to sewage and industrial input. Only minor changes in granulometry and faunal composition were observed in comparison with previous data from the same area, suggesting that the lagoon is still perturbed due to the effect of anthropogenic activities.Keywords: Polychaeta, Oligochaeta, soft-bottoms, indicator species, human activities, Sinaloa. RESUMEN: Efectos de la contaminación orgánica sobre la distribución de las comunidades de anélidos en la laguna costera "Estero de Urías" (Mexico). -La laguna costera "Estero de Urías" se encuentra sujeta al efecto de varias actividades antropogénicas y ha sido caracterizada desde 1997 a través del estudio de la fauna bentónica. Con el fin de conocer el grado de perturbación actual, se analizó la distribución espacial y temporal de los anélidos, así como su relación con las variables ambientales (profundidad, tamaño de grano, materia orgánica y temperatura del sedimento). Los valores de densidad, riqueza específica, diversidad, dominancia, biomasa y la aplicación de técnicas de clasificación y ordenación permitieron distinguir cinco zonas: 1) zona no perturbada, en la boca de la laguna; 2) zona ligeramente perturbada, bordeada por manglares y granjas camaronícolas; 3) zona temporalmente perturbada, cerca del efluente de la planta termoeléctrica; 4) zona perturbada, frente al matadero y la fábrica procesadora de pescado; 5) zona muy perturbada, sujeta al efecto de los desechos domésticos e industriales. La comparación con los datos previos registrados para la misma zona indica que la laguna ha sufrido sólo cambios ligeros en la granulometría y en la composición faunística. Esto sugiere que la laguna aún se encuentra perturbada debido al efecto que producen las actividades antropogénicas.

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Section: Introductionsupporting

confidence: 88%

“…The climate is tropical/subtropical, with two contrasting seasons: rainy (July-October) and dry (November-June). The average annual temperature is 25°C and the average annual rainfall 800 mm (Ochoa-Izaguirre et al, 2002).…”

Section: Study Areamentioning

confidence: 99%

Effects of organic pollution in the distribution of annelid communities in the Estero de Urías coastal lagoon, Mexico

Ferrando¹,

Méndez²

2010

Sci. Mar.

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“…En las últimas décadas ha ocurrido una alteración en la disponibilidad natural de N en los ecosistemas costeros del golfo de California (México) debido a que se han incrementado sustancialmente los aportes de N por actividades humanas (Soto Jiménez et al 2003a, Piñón-Gimate et al 2009). El sistema lagunar de Urías es uno de los ecosistemas más impactados por el aporte antropogénico de N, lo cual es evidenciado por la eutrofización progresiva (Ochoa-Izaguirre et al 2002).…”

Section: Introductionunclassified

Evaluation of nitrogen sources in the Urias lagoon system, Gulf of California, based on stable isotopes in macroalgae

Izaguirre

Soto-Jiménez

2013

Cienc. Mar.

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in 738 samples of macroalgae collected during one year across the Urías lagoon system (Mazatlán, Sinaloa, Mexico) were analyzed in order to study the N sources. The  15 N-macroalgae premise is that they register and integrate the variability of N and may provide time-integrated information about N pollution. To validate this premise, we applied two models to predict the isotopic variability of N available in the water column ( 15 N-DIN): one is based on a physical mixing balance of N sources (simple model), and the second includes the effects of the biogeochemical processes on the signals (coupled model, CM). Both models showed significant R 2 , but CM better explained the  15 N-DIN variability. The relation between δ 15 N-DIN CM and δ 15 N-macroalgae also showed a good fit, although lower than expected and with higher dispersion. The multiple N sources and co-occurring biogeochemical reactions, which produce a mixture of chemical species of N and of their isotopic compositions, as well as the high diversity of species (45) explained the elevated variability and lack of fit. Even so,  15 N in macroalgae is the most useful available tool to quantify the relative contributions of N to ecosystems from different sources. Based on Bayesian isotopic mixing models, the main anthropogenic sources of N to the Urías lagoonal system were domestic effluents (50%), atmospheric deposition (24%), and seafood processing plant effluents (21%), and to a lesser extent, aquaculture effluents (3%), agriculture runoff (1%), and oceanic N (1%).Key words: δ 15 N, eutrophication, biogeochemical cycle, NLOAD model, MixSIR. RESUMEN. Las concentraciones de las formas químicas de nitrógeno (N) y su composición isotópica en la columna de agua y las señales deδ 15 N en 738 muestras de macroalgas recolectadas durante un año en el sistema lagunar de Urías (Mazatlán, Sinaloa, México) fueron analizadas para estimar las fuentes de N. La premisa sobre el uso de  15 N en macroalgas es que las macroalgas asimilan 15 N en proporción a la disponibilidad y reflejan la fuente de N de una manera predecible. Para validar esta premisa, se aplicaron dos modelos para la predicción de la variabilidad isotópica del N en el agua ( 15 N-NID): el primero se basa en una mezcla física de las fuentes de N (modelo simple), y el segundo integra los efectos de procesos biogeoquímicos sobre sus señales isotópicas (modelo acoplado, MA). Ambos modelos mostraron valores de R 2 significativos, pero el MA explicó mejor la variabilidad del δ 15 N-NID. La relación entre δ 15 N-NID MA y δ 15 N-macroalgas también mostró un buen ajuste, aunque menor al esperado y con una alta dispersión. Las múltiples fuentes de N y reacciones biogeoquímicas concurrentes, que producen una mezcla compleja de especies químicas de N y de sus composiciones isotópicas, además de la alta diversidad de especies (45), explicaron la elevada variabilidad y la falta de ajuste. Aun así, la técnica de  15 N en macroalgas es la herramienta más útil que existe para cuantificar las contribuciones relativas...

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“…Some of the 40 lagoons found along this coastline, including those of this study, receive various types and volumes of effluents. These cause different degrees of impact and are the most probable origin of the various micro and macroalgal blooms detected along the Gulf of California coasts (Ochoa et al, 2002;Piñón-Gimate et al, 2008.…”

Section: Introductionmentioning

confidence: 99%

“…Freshwater influx is limited to discharges of urban and industrial wastewaters and to surface runoff during the rainy season. For this reason, salinity is highly variable, both locally and seasonally, ranging from <10 to >45 (Ochoa-Izaguirre et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Izaguirre¹,

Voltolina²,

Sanchez³

2017

Turk. J. Fish. Aquat. Sci.

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In this work we aimed to determine if different sources of anthropogenic impact of different water bodies may affect the nitrogen (N) and phosphorus (P) contents of macroalgae biomass. To this end, samples of water and macroalgae were collected every second month in Urías lagoon (UR) and in Altata-Ensenada del Pabellón (AL and EP) lagoonal system of NW Mexico. The order of concentrations of dissolved N was UR> EP>AL (P<0.001), that of reactive P was EP>UR>AL (P < 0.001). The N content of the macroalgal biomass of the three lagoons was not significantly different, but the P content was significantly (P <0.001) lower in UR than in EP and AL. The N: P ratios in algal biomass seemed to indicate that N was below optimum values for growth in AL and EP, while P was below optimum in UR. However, the algae N and P contents were consistently high in the three lagoons, indicating adequate concentrations of external nutrients for optimum growth.

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Qualitative Changes in Macroalgal Assemblages under Two Contrasting Climatic Conditions in a Subtropical Estuary

Cited by 28 publications

References 10 publications

Effects of organic pollution in the distribution of annelid communities in the Estero de Urías coastal lagoon, Mexico

Effects of organic pollution in the distribution of annelid communities in the Estero de Urías coastal lagoon, Mexico

Evaluation of nitrogen sources in the Urias lagoon system, Gulf of California, based on stable isotopes in macroalgae

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