The impact of accelerating land-use change on the N-Cycle of tropical aquatic ecosystems: Current conditions and projected changes

Downing, John A.; McClain, Michael E.; Twilley, Robert R.; Mélack, John M.; Elser, James J.; Rabalais, Nancy N.; Lewis, William M.; Turner, R. Eugene; Corredor, Jorge E.; Soto, Doris; Yáñez‐Arancibia, Alejandro; Kopaska, Jeff; Howarth, Robert W.

doi:10.1007/bf01007576

Cited by 156 publications

(72 citation statements)

References 102 publications

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“…Wetland and aquatic ecosystems worldwide are impacted by human-mediated increases in nutrient input (Downing et al 1999;Schindler 2012). Yet many aspects of this impact are poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Phenolic content and growth of wetland macrophytes: Is the allocation to secondary compounds driven by nutrient availability?

Rejmánková

2015

Folia Geobot

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This study compares soluble phenolics and lignin content in two wetland macrophytes with contrasting life strategies grown under a varying nutrient supply in the field and in a greenhouse experiment. The differences are explained in terms of the protein competition model (PCM) hypothesis relating changes in secondary metabolites to changing nutrient limitation. The two study species, Eleocharis cellulosa (EC) and Typha domingensis (TD), are both widespread in tropical and subtropical freshwater and brackish marshes of the New World, and are often found in P-limited rather than Nlimited conditions. TD is a fast-growing competitor with large nutrient requirements. EC is a stress tolerator, quite well adapted to growth in nutrient-limiting environments. In both species, the concentration of phenolics was negatively correlated with increasing growth (due to increasing nutrient levels). This is in agreement with the PCM hypothesis, which predicts an increase in phenolic synthesis when protein synthesis (and consequently growth) is low due to limited resource availability. An interesting difference was found in the correlation between tissue nutrients and phenolics. TD from both the field and the greenhouse showed a negative correlation between tissue P and phenolics, while EC displayed a significant negative correlation between tissue N and phenolics. EC is adapted to low P, and increased tissue P content represents luxury consumption (uptake of P for storage) which is not reflected in increased growth and thus is not correlated with phenolics. These are the first steps in elucidating the relationship among nutrient availability, growth and phenolic content in two important primary producers of tropical and subtropical marshes.

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Section: Introductionmentioning

confidence: 99%

Phenolic content and growth of wetland macrophytes: Is the allocation to secondary compounds driven by nutrient availability?

Rejmánková

2015

Folia Geobot

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“…watersheds [22][23][24]. Thus, there is an urgent need to conduct more case studies on estimating the relationship between land use and water quality in tropical and subtropical Asian systems.…”

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confidence: 99%

Impacts of Land Use on Surface Water Quality in a Subtropical River Basin: A Case Study of the Dongjiang River Basin, Southeastern China

Ding

Jiang

Fu³

et al. 2015

Water

162

103

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Abstract:Understanding the relationship between land use and surface water quality is necessary for effective water management. We estimated the impacts of catchment-wide land use on water quality during the dry and rainy seasons in the Dongjiang River basin, using remote sensing, geographic information systems and multivariate statistical techniques. The results showed that the 83 sites can be divided into three groups representing different land use types: forest, agriculture and urban. Water quality parameters exhibited significant variations between the urban-dominated and forest-dominated sites. The proportion of forested land was positively associated with dissolved oxygen concentration but negatively associated with water temperature, electrical conductivity, permanganate index, total phosphorus, total nitrogen, ammonia nitrogen, nitrate nitrogen and chlorophyll-a. The proportion of urban land was strongly positively associated with total nitrogen and ammonia nitrogen concentrations. Forested and urban land use had stronger impacts on water quality in the dry season than in the rainy OPEN ACCESSWater 2015, 7 4428 season. However, agricultural land use did not have a significant impact on water quality. Our study indicates that urban land use was the key factor affecting water quality change, and limiting point-source waste discharge in urban areas during the dry season would be critical for improving water quality in the study area.

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“…Human activity is accelerating rapidly in tropical watersheds, where eutrophication is becoming the main water quality issue (Downing et al 1999), interfering with the designated uses of these water bodies (Salas and Martino 1991). In Mexico, a nationwide survey found that 68% of surface waters were contaminated, and * Corresponding author: jramirezzierold@yahoo.com.mx 18% were already heavily contaminated by 1996 (INEGI 1996).…”

mentioning

confidence: 99%

Changing water, phosphorus and nitrogen budgets for Valle de Bravo reservoir, water supply for Mexico City Metropolitan Area

Ramírez-Zierold

Merino–Ibarra

Monroy-Ríos

et al. 2010

Lake and Reservoir Management

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The impact of accelerating land-use change on the N-Cycle of tropical aquatic ecosystems: Current conditions and projected changes

Cited by 156 publications

References 102 publications

Phenolic content and growth of wetland macrophytes: Is the allocation to secondary compounds driven by nutrient availability?

Phenolic content and growth of wetland macrophytes: Is the allocation to secondary compounds driven by nutrient availability?

Impacts of Land Use on Surface Water Quality in a Subtropical River Basin: A Case Study of the Dongjiang River Basin, Southeastern China

Changing water, phosphorus and nitrogen budgets for Valle de Bravo reservoir, water supply for Mexico City Metropolitan Area

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