Population structure and dynamics of the freshwater shrimp Atyaephyra desmarestii (Millet, 1831) in the lower River Minho (NW Portugal)

This paper reports population dynamics, growth, and reproductive features ofAtyaephyra desmarestii(Millet, 1831) from the estuary of the River Minho. Also, data were compared to information available from its distribution range. Samples were taken monthly between October 2010 and September 2011. Males were less abundant and smaller than females. The growth pattern showed hardly any increase during the autumn and winter, but a fast increase in size was recorded in spring, followed by slower growth in summer. The life span was 11-12 months. The reproductive period was from April to August, and mean fecundity reached 643 ± 254 eggs/female. Juveniles started to appear in July and a strong recruitment occurred in summer and autumn. The ecological relevance of the shrimp supports the need of obtaining further and more specific knowledge on the relationship between geographical distribution and water quality. Our results coupled with longer time series in different localities will be essential to the conservation of the species.

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Sexual size dimorphism, sex ratio and the relationship between seasonality and water quality in four species of Gordiida (Nematomorpha) from Catamarca, Argentina

Journal of Helminthology ◽

10.1017/s0022149x1000057x ◽

2010 ◽

Vol 85 (3) ◽

pp. 319-324 ◽

Cited By ~ 5

Author(s):

L. Salas ◽

C. De Villalobos ◽

F. Zanca

Keyword(s):

Water Quality ◽

Sex Ratio ◽

Water Temperature ◽

Flow Rate ◽

Sexual Size Dimorphism ◽

Free Living ◽

Size Dimorphism ◽

Autumn And Winter ◽

The Relationship

AbstractA total of 687 adult nematomorphs of four species of Gordiida:Chordodes brasiliensis(393 specimens),Noteochorododes cymatium(47 specimens),N. talensis(162 specimens) andPseudochordodes dugesi(85 specimens) were collected during a period of 1 year from El Simbolar stream, Argentina. Free-living worms were abundant during autumn and spring, but their number decreased during winter and summer. Males were shorter and significantly more abundant than females. The presence ofN. cymatium,N. talensisandP. dugesiwas correlated with water temperature and these species were most abundant in winter and spring. The presence ofC. brasiliensiswas correlated with flow rate and pH; this species was more abundant in autumn and winter. These four species are sympatric.

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An importance of soil humidification in forming of avifauna of arboreal plantation in the Biosphere reserve «Askania Nova» (un-reproductive period)

Ecology and Noospherology ◽

10.15421/031614 ◽

2016 ◽

Vol 27 (3-4) ◽

pp. 55-69

Author(s):

M. A. Listopadsky

Keyword(s):

Soil Moisture ◽

Influence Factors ◽

Data Communication ◽

Biosphere Reserve ◽

Reproductive Period ◽

Defined Contribution ◽

Separate Species ◽

Steppe Birds ◽

Reserve Forest ◽

Autumn And Winter

With gradient analysis investigated the role of soil moisture in the formation of the modern population of birds in the reserve forest plantations. Soil moisture was divided into seven grades. For this purpose used grass cover and the coefficient of local moistening. His proposed PhD L. P. Travleev. This method allows knowing the degree of influence of soil moisture at the birds. We analyzed birds species composition, population, placement in space and power of influence factors (soil moisture). Investigations were carried out on the territory of the Biosphere Reserve «Askania Nova». We studied the birds which live in the reserve at the end of the summer, autumn and winter. This happened from 2006 to 2013 years. Specially was studied as permanently specific form of birds is found in a particular humidity. The degree of coupling was studied using the amount of information that transmits to the local bird humidification. For 68 species of birds are the options of the population density, coefficient koligatsii and data communication with the seven variants of soil moisture. For all kinds of set information «price» of each option dampening that contributes to the formation of a particular community of birds. Thus, the defined contribution to the formation of soil moisture forest bird communities. Species representation and density gradient within the test moisture is not in direct linear relationship from moisture and ranges from 11 (very coldly) to 50 species (moist soil). The density of the community varies from 0,5 birds / hectare (very dry) to 269 birds / hectare (fresh soil). The strongest link between the information and the formation of moisture gradient structure avifauna is typical in a fresh soil – bird on the edge, and wet – forest representatives. These types of humidification function is performed starting in the formation of two major blocks dendrophilous community. The steppe birds give way to forest representatives when the soil slightly moist. The main conclusion of our study includes the following: than wetter the soil the more species of birds lives in the forest; some graduation humidity are the most important for separate species of birds; it is very important for birds, there are places where one can drink water. Further invasive alien species can occur where the soil is moist. Forest with dry soil is already fully occupied by birds.

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The relationship between musty-odor-causing organisms and water quality in Lake Biwa

Water Science & Technology ◽

10.2166/wst.1995.0426 ◽

1995 ◽

Vol 31 (11) ◽

pp. 153-158 ◽

Cited By ~ 3

Author(s):

M. Kajino ◽

K. Sakamoto

Keyword(s):

Water Quality ◽

Data Analysis ◽

Green Algae ◽

Analytical Methods ◽

Lake Biwa ◽

Blue Green Algae ◽

Odor Compounds ◽

Musty Odor ◽

The Relationship

Musty odor has occurred annually in Lake Biwa since 1969. Osaka municipal waterworks, which is located downstream of Lake Biwa, has made many efforts to treat musty-odor compounds produced in Lake Biwa from spring through autumn. With the development of analytical methods for the determination of musty-odor compounds, we have been able to confirm that planktonic blue-green algae are the major causes of the musty-odor occurrences. The relationship between the growth of blue-green algae and the water quality was not so apparent. However, through our data analysis focusing on the relationship between musty-odor occurrences due to Phormidium tenue or Oscillatoria tenuis and some nutrients in Lake Biwa, we found that the concentration of nitrate in water may be an important parameter for the estimation of growth of the algae and the musty-odor behavior.

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The relationship between health effects in triathletes and microbiological quality of freshwater

Water Science & Technology ◽

10.2166/wst.1995.0549 ◽

1995 ◽

Vol 31 (5-6) ◽

pp. 19-26 ◽

Cited By ~ 7

Author(s):

G. J. Medema ◽

I. A. van Asperen ◽

J. M. Klokman-Houweling ◽

A. Nooitgedagt ◽

M. J. W. van de Laar ◽

...

Keyword(s):

Water Quality ◽

Geometric Mean ◽

Microbiological Quality ◽

Quality Parameters ◽

Health Complaints ◽

E Coli ◽

Thermotolerant Coliforms ◽

Microbiological Water Quality ◽

The Relationship ◽

Faecal Streptococci

This pilot study was carried out to determine the relationship between microbiological water quality parameters and the occurrence of health complaints among triathletes. Data were collected at an Olympic distance triathlon (n=314) and a run-bike-run (n=81; controls for exposure to fresh water). At the time of the triathlon, the concentrations of Escherichia coli , thermotolerant coliforms, faecal streptococci, entero- and reoviruses, F-specific RNA phages, Salmonella, Campylobacter, Aeromonas, Plesiomonas shigelloides, Pseudomonas aeruginosa and Staphylococcus aureus were examined over the swimming course. Information on the occurrence of health complaints during the competition and in the week thereafter was collected through a written questionnaire. The results show that triathletes and run-bike-runners are comparable with respect to factors other than water exposure (age, sex, training history, physical stress, lower intestinal health complaints during the competition) that may influence the occurrence of health complaints in the week after the competition. Triathletes and run-bike-runners reported gastro-intestinal (7.7% vs 2.5%), respiratory (5.5% vs 3.7%), skin/mucosal (2.6% vs 1.2%), general (3.5% vs 1.2%) and total symptoms (14.8% vs 7.4%) in the week after the event. The health risks for triathletes for all symptom groups are not significantly higher than for run-bike-runners. The geometric mean concentration of faecal indicator bacteria is relatively low: E. coli 170/100 ml; faecal streptococci 13/100 ml, enteroviruses were present at concentrations of 0.1/l. The group of triathletes was homogeneusly and relatively intensely exposed to water; they all swam in the same body of water at the same time and 75% reported to have swallowed freshwater. It was concluded that this study design is suitable to study the relationship between health complaints and microbiological water quality. In the summers of 1993 and 1994, a study will be carried out concerning several run-bike-runs and triathlons in freshwaters of different quality.

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The effect of type of water supply on water quality in a developing community in South Africa

Water Science & Technology ◽

10.2166/wst.1997.0706 ◽

1997 ◽

Vol 35 (11-12) ◽

pp. 35-40 ◽

Cited By ~ 6

Author(s):

B. Genthe ◽

N. Strauss ◽

J. Seager ◽

C. Vundule ◽

F. Maforah ◽

...

Keyword(s):

Water Quality ◽

Water Supply ◽

Cross Sectional Study ◽

Cross Sectional ◽

E Coli ◽

Guideline Values ◽

Developing Communities ◽

Quality Guideline ◽

And Control ◽

The Relationship

Efforts to provide water to developing communities in South Africa have resulted in various types of water supplies being used. This study examined the relationship between the type of water supply and the quality of water used. Source (communal taps, private outdoor and indoor taps) and point-of-use water samples were examined for heterotrophic plate counts (HPC), total and faecal coliforms, E. coli, and coliphages. Ten percent of samples were also analysed for enteric viruses, Giardia and Cryptosporidium. Approximately 320 households were included in a case-control study. In addition, a cross-sectional study was conducted. Both studies examined the relationship between different types of water facilities and diarrhoea among pre-school children. The source water was of good microbial quality, but water quality was found to have deteriorated significantly after handling and storage in both case and control households, exceeding drinking water quality guideline values by 1-6 orders of magnitude. Coliphage counts were low for all water samples tested. Enteric viruses and Cryptosporidium oocysts were not detected. Giardia cysts were detected on one occasion in case and control in-house samples. Comparisons of whether in-house water, after handling and storage, complied with water quality guideline values demonstrated households using communal taps to have significantly poorer quality than households using private outdoor or indoor taps for HPC and E. coli (χ2 = 14.9, P = 0.001; χ2 = 6.6, P = 0.04 respectively). A similar trend (although not statistically significant) was observed for the other microbial indicators. The cross-sectional study demonstrated an apparent decrease in health risk associated with private outdoor taps in comparison to communal taps. This study suggests that a private outdoor tap is the minimum level of water supply in order to ensure the supply of safe water to developing communities.

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Assessing the Market for Poultry Litter in Georgia: Are Subsidies Needed to Protect Water Quality?

Journal of Agricultural and Applied Economics ◽

10.1017/s1074070800000079 ◽

2011 ◽

Vol 43 (4) ◽

pp. 553-568 ◽

Cited By ~ 3

Author(s):

Jeffrey Mullen ◽

Ulugbek Bekchanov ◽

Berna Karali ◽

David Kissel ◽

Mark Risse ◽

...

Keyword(s):

Water Quality ◽

Poultry Litter ◽

Focused Attention ◽

Water Protection ◽

Nutrient Loads ◽

Transportation Model ◽

Synthetic Fertilizer ◽

Protection Goals ◽

Subsidy Program ◽

The Relationship

Concerns about nutrient loads into our waters have focused attention on poultry litter applications. Like many states with a large poultry industry, Georgia recently designed a subsidy program to facilitate the transportation of poultry litter out of vulnerable watersheds. This paper uses a transportation model to examine the necessity of a poultry litter subsidy to achieve water protection goals in Georgia. We also demonstrate the relationship between diesel and synthetic fertilizer prices and the value of poultry litter. Results suggest that a well-functioning market would be able to remove excess litter from vulnerable watersheds in the absence of a subsidy.

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Effect of Maritime Traffic on Water Quality Parameters in Santa Marta, Colombia

Journal of Marine Science and Engineering ◽

10.3390/jmse9050474 ◽

2021 ◽

Vol 9 (5) ◽

pp. 474

Author(s):

René Rodríguez-Grimón ◽

Nestor Hernando Campos ◽

Ítalo Braga Castro

Keyword(s):

Water Quality ◽

Petroleum Hydrocarbons ◽

Quality Parameters ◽

Water Quality Parameters ◽

Maritime Traffic ◽

Natural Park ◽

High Concentrations ◽

The Impact ◽

The Relationship ◽

Multiple Chemical

Since 2013, there has been an increase (>23%) in naval traffic using maritime routes and ports on the coastal fringe of Santa Marta, Colombia. Of major concern, and described by several studies, is the relationship between maritime traffic and coastal contamination. This study proposed a maritime traffic indicator considering the simultaneous effects of several relevant measurements of water quality parameters to estimate the impact of naval activity. The approach involved developing a model including the number of vessels, hull length, and permanence time in berths. In addition, water quality variables, considering climatic seasons, were used to verify association with maritime traffic and touristic activities. The high concentrations of total coliforms (TC) and dissolved/dispersed petroleum hydrocarbons in chrysene equivalents (DDPH) reported by the International Marina of Santa Marta (SM) were affected by the local anthropic activities, including tourism, naval traffic, and urban wastewater discharges. Moreover, our results suggest the occurrence of multiple chemical impacts within Tayrona National Natural Park (PNNT) affecting conservation goals. The estimation of the maritime traffic indicator proposed in this study may be an easy and more complete tool for future studies evaluating the impact of naval activities on environmental quality.

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Surface Sediment Diatom Assemblages Response to Water Environment in Dongping Lake, North China

Water ◽

10.3390/w13030339 ◽

2021 ◽

Vol 13 (3) ◽

pp. 339

Author(s):

Shuangshuang Liu ◽

Min Yao ◽

Shiyue Chen ◽

Xingzhong Yuan

Keyword(s):

Environmental Factors ◽

Water Environment ◽

Oxygen Demand ◽

Diatom Assemblages ◽

Multivariate Statistical ◽

Dongping Lake ◽

Autumn And Winter ◽

Response To Water ◽

The Relationship ◽

Significant Factors

The relationship between the diatom taxa preserved in surface lake sediments and environmental variables in Dongping Lake was explored using multivariate statistical methods. The statistical analysis showed that the lake was eutrophicated in all seasons. Transparency, chlorophyll a (Chla) and total phosphorus (TP) were the dominant environmental factors in spring and summer, and NH4+-N and chemical oxygen demand (COD) were the dominant environmental factors in autumn and winter. Sixteen genera and 43 species of diatom were found in the surface sediments, and the dominant diatom genera were Aulacoseira, Ulnaria, Cyclotella, Navicula and Fragilaria. A redundancy analysis (RDA) and Monte Carlo permutation 20 test revealed that COD, pH, TP, conductivity and transparency were significant factors influencing diatom assemblage change, meaning that the distribution of the diatom assemblages were mostly influenced by nutrient composition, light intensity and ion concentrations.

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