scholarly journals The algal growth-limiting nutrient of lakes located at Mexico’s Mesa Central

2016 ◽  
Vol 75 (s1) ◽  
Author(s):  
Fernando W. Bernal-Brooks ◽  
José J. Sánchez Chávez ◽  
Luis Bravo Inclán ◽  
Rubén Hernández Morales ◽  
Ana K. Martínez Cano ◽  
...  
Keyword(s):  
Case Studies ◽  
Algal Growth ◽  
Dry Season ◽  
Growth Potential ◽  
Sampling Station ◽  
Wet Season ◽  
N Limitation ◽  
P Limitation ◽  
Limiting Nutrients ◽  
Limiting Nutrient

<p>This paper reports on the algal growth-limiting nutrients of five lakes located on Mexico’s Mesa Central - a topic poorly known in the regional limnology of Mexico. The five case studies involved three contiguous watersheds of Michoacán State and provided a trophic state variation from mesotrophic to hypereutrophic; the case studies included Lakes Zirahuén, Pátzcuaro, Teremendo, Cuitzeo and the Cointzio Reservoir. The fieldwork involved the collection of physical and chemical data (including nutrients) from each case study during the dry and rainy seasons of 2010. Additionally, water samples (1 L) were obtained and filtered (0.45 µm) in the laboratory to keep the nutrient content available for bioassays. The chemical analyses suggested a phosphorus (P) limitation in the Cointzio Reservoir, Lake Teremendo and Lake Zirahuén relative to an N:P&gt;16:1. There was a nitrogen (N) limitation at three sampling stations of Lake Pátzcuaro, with an N:P&lt;16:1. As result of the bioassays conducted in July 2012, the Cointzio Reservoir and Lake Teremendo appeared to be P-limited and Lake Pátzcuaro appeared to be N-limited at three sampling stations. Lake Zirahuén showed seasonal variation, with an N limitation during the dry season and a P limitation during the wet season. Those cases with similar results from both methods confirmed the limiting nutrient identification. Lake Cuitzeo, Lake Zirahuén (dry season), and the shallowest sampling station in Lake Pátzcuaro produced unclear results because of divergent outcomes. In terms of the algal growth potential, the Cointzio Reservoir remained unaltered from one season to the next. However, for most of the lakes (with the exception of Lake Pátzcuaro sites 2 and 4), the rainy season provided a dilution effect. Effective lake management depends on a clear recognition of such elements that are in control of the aquatic productivity. In the area of Michoacán, both N and P may act as limiting nutrients.</p>

scholarly journals Contrasting patterns of litterfall seasonality and seasonal changes in litter decomposability in a tropical rainforest region

2014 ◽  
Vol 11 (6) ◽  
pp. 7901-7929
Author(s):  
S. A. Parsons ◽  
V. Valdez-Ramirez ◽  
R. A. Congdon ◽  
S. E. Williams
Keyword(s):  
Seasonal Changes ◽  
Biogeochemical Cycles ◽  
Dry Season ◽  
Tropical Region ◽  
Soil N ◽  
Wet Season ◽  
Evergreen Forests ◽  
P Limitation ◽  
Global Trend ◽  
The Difference

Abstract. The seasonality of litter inputs in forests has important implications for understanding ecosystem processes and biogeochemical cycles. We quantified the drivers of seasonality in litterfall and leaf decomposability, using plots throughout the Australian wet tropical region. Litter fell mostly in the summer (wet, warm) months in the region, but other peaks occurred throughout the year. Litterfall seasonality was modelled well with the level of deciduousness of the site (plots with more deciduous species had lower seasonality than evergreen plots), temperature (higher seasonality in the uplands), disturbance (lower seasonality with more early secondary species) and soil fertility (higher seasonality with higher N : P/P limitation) (SL total litterfall model 1 = deciduousness + soil N : P + early secondary sp: r2 = 0.63, n = 30 plots; model 2 = temperature + early secondary sp. + soil N : P: r2 = 0.54, n = 30; SL leaf = temperature + early secondary sp. + rainfall seasonality: r2 = 0.39, n = 30). Leaf litter decomposability was lower in the dry season than in the wet season, driven by higher phenolic concentrations in the dry, with the difference exacerbated particularly by lower dry season moisture. Our results are contrary to the global trend for tropical rainforests; in that seasonality of litterfall inputs were generally higher in wetter, cooler, evergreen forests, compared to generally drier, warmer, semi-deciduous sites that had more uniform monthly inputs. We consider this due to more diverse litter shedding patterns in semi-deciduous and raingreen rainforest sites, and an important consideration for ecosystem modellers. Seasonal changes in litter quality are likely to have impacts on decomposition and biogeochemical cycles in these forests due to the litter that falls in the dry being more recalcitrant to decay.

Algal Growth Potential and the limiting nutrient in Mikawa Bay

1984 ◽  
Vol 40 (5) ◽  
pp. 391-396
Author(s):  
Masao Kondo ◽  
Tsutomu Sakai ◽  
Hajime Yamamoto ◽  
Yukio Arakawa
Keyword(s):  
Algal Growth ◽  
Growth Potential ◽  
Algal Growth Potential ◽  
Limiting Nutrient

scholarly journals The role of inorganic and organic nutrients on the development of phytoplankton along a transect from the Daugava River mouth to the Open Baltic, in spring and summer 1999

2003 ◽  
Vol 60 (4) ◽  
pp. 827-835 ◽  
Author(s):  
Tõnis Põder ◽  
Serge Y Maestrini ◽  
Maija Balode ◽  
Urmas Lips ◽  
Christian Béchemin ◽  
...  
Keyword(s):  
Lower Layer ◽  
Organic Phosphorus ◽  
Inorganic Nitrogen ◽  
Algal Growth ◽  
River Mouth ◽  
Growth Potential ◽  
Nutrient Concentrations ◽  
Nitrogen Fixing ◽  
Limiting Nutrient ◽  
Gulf Of Riga

Abstract The importance of dissolved silicate (DSi), dissolved inorganic nitrogen (DIN), dissolved organic nitrogen (DON), phosphate and dissolved organic phosphorus (DOP) on algal growth is analysed for the Gulf of Riga and the adjacent open Baltic Sea. The results of three cruises (May, June, and July, 1999) along a transect across the Gulf of Riga from the entrance to the Daugava River to the open Baltic are presented. Nutrient-limitation was identified on the basis of available nutrient concentrations and stoichiometric analysis. In spring, phosphate appeared to be the algal-growth-potential-limiting nutrient at the entrance of the Daugava River, DSi in the central Gulf, and DIN at the open Baltic station. There was no correlation between limiting nutrient and spring phytoplankton community structure. Both the DIN and phosphate pools of the upper mixed layer were exhausted by mid-May, except at the river mouth. In summer there was a good correlation between phytoplankton biomass and DOP along the transect. Contrary to the situation in the open Baltic, the lower layer DIN/phosphate ratio in the Gulf of Riga significantly exceeds the Redfield ratio, and upwelling likely does not favour nitrogen-fixing species. Therefore, the upper layer DOP pool should be regarded as potentially the main source of phosphorus for nitrogen-fixing cyanobacteria in the Gulf of Riga.

scholarly journals Contrasting patterns of litterfall seasonality and seasonal changes in litter decomposability in a tropical rainforest region

2014 ◽  
Vol 11 (18) ◽  
pp. 5047-5056 ◽  
Author(s):  
S. A. Parsons ◽  
V. Valdez-Ramirez ◽  
R. A. Congdon ◽  
S. E. Williams
Keyword(s):  
Seasonal Changes ◽  
Biogeochemical Cycles ◽  
Dry Season ◽  
Tropical Region ◽  
Soil N ◽  
Wet Season ◽  
Evergreen Forests ◽  
P Limitation ◽  
Global Trend ◽  
The Difference

Abstract. The seasonality of litter inputs in forests has important implications for understanding ecosystem processes and biogeochemical cycles. We quantified the drivers of seasonality in litterfall and leaf decomposability using plots throughout the Australian wet tropical region. Litter fell mostly in the summer (wet, warm) months in the region, but other peaks occurred throughout the year. Litterfall seasonality was modelled well with the level of deciduousness of the site (plots with more deciduous species had lower seasonality than evergreen plots), temperature (higher seasonality in the uplands), disturbance (lower seasonality with more early secondary species) and soil fertility (higher seasonality with higher N : P/P limitation) (SL total litterfall model 1 = deciduousness + soil N : P + early secondary sp.: r2 = 0.63, n = 30; model 2 = temperature + early secondary sp. + soil N : P: r2 = 0.54, n = 30; SL leaf = temperature + early secondary sp. + rainfall seasonality: r2 = 0.39, n = 30). Leaf litter decomposability was lower in the dry season than in the wet season, driven by higher phenolic concentrations in the dry, with the difference exacerbated particularly by lower dry season moisture. Our results are contrary to the global trend for tropical rainforests; in that seasonality of litterfall input was generally higher in wetter, cooler, evergreen forests, compared to generally drier, warmer, semi-deciduous sites that had more uniform monthly inputs. We consider this due to more diverse litter shedding patterns in semi-deciduous and raingreen rainforest sites, and an important consideration for ecosystem modellers. Seasonal changes in litter quality are likely to have impacts on decomposition and biogeochemical cycles in these forests due to the litter that falls in the dry season being more recalcitrant to decay.

The algal growth potential and algae growth-limiting nutrients for 30 of Mexico's lakes and reservoirs

2001 ◽  
Vol 27 (6) ◽  
pp. 3583-3588 ◽  
Author(s):  
J. Salvador Hernández-Avilés ◽  
Fernando Bernal-Brooks ◽  
Gabriela Velarde ◽  
David Ortíz ◽  
Owen T. Lind ◽  
...  
Keyword(s):  
Algal Growth ◽  
Growth Potential ◽  
Limiting Nutrients ◽  
Algal Growth Potential ◽  
Algae Growth ◽  
Lakes And Reservoirs

scholarly journals Distributive Characteristics of Riverine Nutrients in the Mun River, Northeast Thailand: Implications for Anthropogenic Inputs

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 954 ◽  
Author(s):  
Jinke Liu ◽  
Guilin Han ◽  
Xiaolong Liu ◽  
Man Liu ◽  
Chao Song ◽  
...  
Keyword(s):  
Flow Direction ◽  
Inorganic Nitrogen ◽  
Biological Effects ◽  
Algal Growth ◽  
Dry Season ◽  
Northeast Thailand ◽  
Wet Season ◽  
Nutrient Contents ◽  
Anthropogenic Inputs ◽  
High Concentrations

The nutrient contents of Mun River water in northeast Thailand during the dry season were measured to investigate the effect of human activities on dissolved load species. Dissolved organic carbon (DOC) values varied from 2.5 to 17.1 mg/L, averaging 9.0 mg/L; dissolved inorganic nitrogen (DIN) ranged between 0.12 and 0.11 mg/L; Cl− values ranged from 1.7 to 668.6 mg/L, with an average value of 84.8 mg/L; dissolved silicon (DSi) varied from 1.7 to 9.9 mg/L; and SO42− values averaged 8.9 mg/L. DOC, Cl−, and SO42− contents decreased with the flow direction. The high concentrations of DOC, K+, Cl−, and SO42− in the upper reaches were closely related to anthropogenic inputs, specifically industrial sewage. The covariation demonstrated that these dissolved loads may have the same sources. In other regions, Cl− contents were derived from weathering products. DIN contents maintained the same level on the river, and few sampling sites with high concentrations of DIN were influenced by point source pollution. The extremely low P concentrations limited algal growth, and the DSi showed no clear relationship with N and K, indicating that DSi in the Mun River was controlled by the weathering input rather than biological effects. The exact reverse spatial distributions of DOC between the wet and dry seasons (which increased with the flow direction in the wet season) were due to different precipitation rates, and the rare rainfall in the dry season had difficulty flushing the soil and transporting soil organic matter into the rivers. The local government should control sewage discharge and optimize farming methods.

scholarly journals Seasonal variation of algal diversity with reference to water quality in Jagadishpur Reservoir, Nepal

2021 ◽  
Vol 21 (4) ◽  
pp. 189-199
Author(s):  
Sajita Pokhrel ◽  
Narayan Prasad Ghimire ◽  
Shiva Kumar Rai
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Physicochemical Parameters ◽  
Diversity Index ◽  
Algal Species ◽  
Algal Growth ◽  
Dry Season ◽  
Wet Season ◽  
Algal Diversity ◽  
Number Of Species

Abstract The study of the importance of physicochemical parameters of water for algal growth and development in Jagdishpur Reservoir was carried out in the present research. Occurrence of algal species and values of water quality parameters also indicate the ecological nature and the present status of the reservoir. Water samples were collected from Jagdishpur Reservoir in Kapilvastu District (Nepal), in two seasons (wet and dry). The following physicochemical parameters of water were analyzed: temperature, pH, dissolved oxygen, alkalinity, concentration of nitrates and phosphates, free CO2, hardness, conductivity, total dissolved solids. The values of free CO2, hardness, phosphate, temperature, and dissolved oxygen were high in wet season while alkalinity, nitrate, conductivity and total dissolved solid were high in dry season. Altogether 81 algal species belonging to 53 genera and 6 classes were recorded. Higher number of algal species was recorded in the dry season rather than in the wet season. The highest number of species was noted among Chlorophyceae, followed by Cyanobacteria > Bacillariophyceae > Euglenophyceae > Crysophyceae and Dinophyceae. Cosmarium had the highest number of species (13) among all genera. During the wet season, Cosmarium, Calothrix and Phormidium were the genera with the highest number of species while Bulbochaete, Trachelomonas and Gomphonema were genera with the lowest number of species. During the dry season, Cymbella, Cosmarium and Rhopalodia were genera with highest number of species while Euglena, Gloeotrichia and Trachelomonas were genera with lowest number of species. Algal diversity was positively correlated with the increase of alkalinity, conductivity and TDS, while negatively correlated with free CO2, hardness, concerntration of phosphates and nitrates, DO, pH and temperature. Shannon–Weiner diversity index value was higher during the dry season than in the wet season.

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