Growth and Production of Eogammarus confervicolus (Amphipoda: Anisogammaridae) at a Log Storage Site and in Areas of Undisturbed Habitat within the Squamish Estuary, British Columbia

1985 ◽  
Vol 42 (11) ◽  
pp. 1733-1740 ◽  
Author(s):  
M. J. Stanhope ◽  
C. D. Levsngs
Keyword(s):  
Water Quality ◽  
Growth Rates ◽  
Mortality Rates ◽  
Storage Site ◽  
Algal Communities ◽  
Fucus Distichus ◽  
Adequate Food ◽  
Wood Debris ◽  
Contrasting Habitats ◽  
Eogammarus Confervicolus

Growth and production of Eogammarus confervicolus was investigated in three contrasting habitats within the Squamish estuary: a log debris area, an embankment along the perimeter of a Carex lyngbyei marsh, and a Fucus distichus community. Eogammarus confervicolus annual production was highest in the "bank" habitat (21.38–21.65 g∙m−2∙yr−1) followed by Fucus (11.31–12.99 g∙m−2∙yr−1) and then wood debris (6.12–6.75 g∙m−2∙yr−1). P: B ratios were similar for the bivoltine wood debris and bank animals (4.67–5.15 and 5.94–6.01, respectively) but lower for the univoltine Fucus population (3.28–3.76). Growth rates were judged to be higher in bank and Fucus than in wood debris. Mortality rates were highest in wood debris. The food available for estuarine amphipods in wood debris habitats is thought to be inferior to that produced in marsh and algal communities. Despite the fact that E. confervicolus production in wood debris was much lower than in undisturbed locations, the possibility remains that such areas are still adequate food gathering areas for juvenile salmonids, if water quality conditions permit fish access to the log storage site.

Population characteristics of the estuarine isopod Gnorimosphaeroma insulare in three contrasting habitats: sedge marsh, algal bed, and wood debris

1987 ◽  
Vol 65 (8) ◽  
pp. 2097-2104 ◽  
Author(s):  
M. J. Stanhope ◽  
D. W. Powell ◽  
E. B. Hartwick
Keyword(s):  
Body Size ◽  
Growth Rates ◽  
Carrying Capacity ◽  
Development Time ◽  
Mortality Rates ◽  
Population Characteristics ◽  
Fucus Distichus ◽  
Wood Debris ◽  
Contrasting Habitats ◽  
Similar Growth

Population characteristics of Gnorimosphaeroma insulare (Isopoda: Sphaeromatidae) were investigated in three habitats within the Squamish estuary, British Columbia: a log debris area, an embankment along the perimeter of a Carex lyngbyei marsh, and a Fucus distichus community. Gnorimosphaeroma insulare annual production was highest in the Fucus habitat (39.54–48.05 g dry wt∙m−2∙year−1) followed by "bank" (22.97–27.74 g∙m−2∙year−1) and then wood debris habitats (4.72–6.43 g∙m−2∙year−1). Cohort figures indicated that male productivity was greater than female productivity in all locations. Production:biomass ratios were similar in all three habitats and ranged between 2.47 and 3.17. Mortality rates were greatest in Fucus; those in wood debris and bank habitats were similar. Growth rates were highest in the bank habitat; those in wood debris and Fucus were similar. Growth and mortality rates of males were greater than those of females. Gnorimosphaeroma insulare is an annual semelparous species. Males died soon after mating, females soon after brood release. Fecundity was linearly related to body size but differed between locations (females from wood debris produced more eggs). Brood mortality was dependent on habitat: females from the bank habitat possessed the highest brood mortality followed by those from wood debris; females from Fucus did not possess any significant brood mortality. Egg development time was estimated at 120 days. The reduced carrying capacity of wood debris substrate is thought to be due to a paucity of microbial epiphytes, particularly fungi.

scholarly journals Water quality drives the regional patterns of an algal metacommunity in interconnected lakes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Min Sung Kim ◽  
Seok Hyun Ahn ◽  
In Jae Jeong ◽  
Tae Kwon Lee
Keyword(s):  
Water Quality ◽  
Community Assembly ◽  
River Flow ◽  
Geographical Area ◽  
Oxygen Demand ◽  
Algal Community ◽  
Regional Patterns ◽  
Algal Communities ◽  
Species Sorting ◽  
Metacommunity Structure

AbstractThe metacommunity approach provides insights into how the biological communities are assembled along the environmental variations. The current study presents the importance of water quality on the metacommunity structure of algal communities in six river-connected lakes using long-term (8 years) monitoring datasets. Elements of metacommunity structure were analyzed to evaluate whether water quality structured the metacommunity across biogeographic regions in the riverine ecosystem. The algal community in all lakes was found to exhibit Clementsian or quasi-Clementsian structure properties such as significant turnover, grouped and species sorting indicating that the communities responded to the environmental gradient. Reciprocal averaging clearly classified the lakes into three clusters according to the geographical region in river flow (upstream, midstream, and downstream). The dispersal patterns of algal genera, including Aulacoseira, Cyclotella, Stephanodiscus, and Chlamydomonas across the regions also supported the spatial-based classification results. Although conductivity, chemical oxygen demand, and biological oxygen demand were found to be important variables (loading > |0.5|) of the entire algal community assembly, water temperature was a critical factor in water quality associated with community assembly in each geographical area. These results support the notion that the structure of algal communities is strongly associated with water quality, but the relative importance of variables in structuring algal communities differed by geological regions.

Ecological assessment of water quality of the Songhua River upper reaches by algal communities

2016 ◽  
Vol 36 (3) ◽  
pp. 126-132 ◽  
Author(s):  
S. Barinova ◽  
Na Liu ◽  
Jiyang Ding ◽  
Yonglei An ◽  
Xueming Qin ◽  
...  
Keyword(s):  
Water Quality ◽  
Ecological Assessment ◽  
Algal Communities ◽  
Songhua River ◽  
The Songhua River

Production and Population Dynamics of the Crayfish Orconectes virilis in Three Michigan Lakes

1977 ◽  
Vol 34 (11) ◽  
pp. 2030-2040 ◽  
Author(s):  
Walter T. Momot ◽  
Howard Gowing
Keyword(s):  
Population Dynamics ◽  
Growth Rates ◽  
Age Groups ◽  
Mortality Rates ◽  
Reproductive Age ◽  
Annual Production ◽  
Effective Density ◽  
Orconectes Virilis ◽  
Brood Stock ◽  
Density Dependent

Fluctuations in mortality rather than in growth rates produced most of the year-to-year differences in biomass accumulation of three different populations of the crayfish Orconectes virilis. Yearly biomass changes resulted from density-dependent control of mortality and fecundity during certain portions of the life cycle. Density-dependent changes in mortality rates controlled population size for adults in all lakes and for young-of-the-year in two of the three study lakes. Growth rates were much less responsive to fluctuating densities. Disparity between the number of ovarian and attached eggs increased as density of age I+ crayfish increased. This provided a strong density regulator on fecundity. Differences occurred in the number of recruits produced by a brood stock that survive to the end of the first growing season in the various lakes. Yet the number of females surviving to reproductive age 2 yr later was strongly regulated. Strong population regulation produced two female recruits of breeding age for every two–six parental breeding females. The high biomass and production levels of crayfish discovered in West Lost Lake in 1962–63 also occurred in the other area lakes. Higher but variable levels of recruitment resulted in larger standing crops and production in West Lost lake. This resulted from less effective density controls on the mortality rates of younger age-groups in that lake. Despite great variation in biomass of from 46 to 213 kg/ha and annual production from 60 to 142 kg/ha, the annual turnover ratio of the biomass was found to vary only between 0.94 and 1.53. Key words: crayfish, Orconectes virilis, population dynamics, annual production, Michigan lakes

scholarly journals Análise coleta de esgoto de Contagem/MG: Uma realidade da situação sanitária do município entre os anos de 2010-14 / Analysis of sewage collect from Contagem/MG: A reality of the sanitary situation of the municipality between the years 2010-14

2016 ◽  
Vol 26 (1) ◽  
pp. 50
Author(s):  
André Lopes Vilaça Santos ◽  
Altino Barbosa Caldeira
Keyword(s):  
Water Quality ◽  
Environmental Impacts ◽  
Service Provider ◽  
Growth Rates ◽  
Minas Gerais ◽  
Public Water Supply ◽  
Population Growth Rates ◽  
Continuous Population ◽  
Belo Horizonte ◽  
The City

<p>O presente artigo buscou discutir a coleta de esgoto pela rede oficial da Companhia de Saneamento de Minas Gerais (COPASA), prestadora de serviço responsável por disponibilizar água tratada, além de coletar e tratar o esgoto, para só assim desaguá-lo nos cursos d’água de Contagem/MG. Contagem é um importante município que compõe a Região Metropolitana de Belo Horizonte (RMBH), que vem apresentando contínuos índices de crescimento populacional nos últimos anos, sendo que, a expansão do tecido urbano vem acontecendo também de maneira clandestina, promovendo desta forma, vários impactos ambientais no município, que possui em mais da metade do município, uma Área de Proteção Ambiental (APA), que possui no seu interior um manancial de abastecimento público, a represa de Várzea das Flores. Foram analisados, tabulados e transformados em gráficos, dados do Sistema Nacional de Informações sobre Saneamento (SNIS) entre os anos de 2010 e 2014, demonstrando que, o município de Contagem precisa de consideráveis avanços na coleta de esgoto, para que haja a redução dos impactos ambientais, e a melhoria da qualidade da água nos cursos d’água e reservatório do município.<strong></strong></p><p><strong> </strong></p><p><strong>Palavras-chave: </strong>Esgotamento Sanitário, Contagem, Impactos Ambientais, Meio Ambiente</p><p> </p><p><strong>Abstract</strong></p><p>This paper reason to discuss the sewerage by the official of the Companhia de Saneamento de Minas Gerais (COPASA), service provider responsible for providing treated water, as well as collect and treat sewage, for only then empties it in watercourses water Contagem. Contagem is an important municipality that make up the Região Metropolitana de Belo Horizonte (RMBH), which has been showing continuous population growth rates in recent years, with the expansion of the urban fabric is also happening clandestinely, thus promoting several impacts environmental in the city, which has more than half of the municipality, an Área de Proteção Ambiental (APA), which has in its interior a public water supply, the dam Várzea das Flores. Were analyzed, tabulated and graphed, data of the Sistema Nacional de Informações sobre Saneamento (SNIS) between the years 2010 and 2014, showing that the city of Contagem need considerable advances in sewerage, so there is a reduction in environmental impacts, and improving water quality in rivers and municipal dam.<strong></strong></p><p><strong> </strong></p><p><strong>Keywords: </strong>Sewerage, Contagem, Environmental impacts, Environment</p>

scholarly journals Bioindication of Water Quality of the Xinlicheng Reservoir by Algal Communities

2020 ◽  
Vol 22 (3) ◽  
pp. 1-16
Author(s):  
Sophia Barinova ◽  
Na Liu ◽  
Jiyang Ding ◽  
Yonglei An ◽  
Xueming Qin ◽  
...  
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Organic Pollution ◽  
Class Ii ◽  
Ecological Analysis ◽  
Algal Communities ◽  
Algal Diversity ◽  
Low Toxicity

Abstract The ecological analysis of 31 algae and cyanobacteria indicators assessed the water quality of the Changchun drinking water Xinlicheng Reservoir by using bio-indication methods. The water was fresh, low alkaline, low-saline, middle oxygenated, with reached nutrients and organic pollution and mesotrophic to eutrophic. Statistics reveal significant variables that impacted algal diversity were nutrients, water quality was low to the middle polluted Class II-III. The indices of saprobity and WESI show the high self-purification capacity and low-toxicity impact. We revealed potential threatening species of cyanobacteria. The improving water quality from 2007 up to now has been revealed.

scholarly journals Bioindication of water quality by algal communities in the Mardan River, Pakistan

2018 ◽  
Vol 11 (1) ◽  
pp. 65-81
Author(s):  
S. Mursaleen ◽  
◽  
Syed Zahir Shah ◽  
Liaqat Ali ◽  
Nadeem Ahmad ◽  
...  
Keyword(s):  
Water Quality ◽  
Algal Communities

scholarly journals Resistance of a lowland rain forest to increasing drought intensity in Sabah, Borneo

2004 ◽  
Vol 20 (6) ◽  
pp. 613-624 ◽  
Author(s):  
D. M. Newbery ◽  
M. Lingenfelder
Keyword(s):  
Growth Rates ◽  
Rain Forest ◽  
Tree Mortality ◽  
Mortality Rates ◽  
Stem Growth ◽  
Lowland Rain Forest ◽  
Drought Intensity ◽  
Tree Survival ◽  
Climatic Environment ◽  
Absolute Growth

Occasional strong droughts are an important feature of the climatic environment of tropical rain forest in much of Borneo. This paper compares the response of a lowland dipterocarp forest at Danum, Sabah, in a period of low (LDI) and a period of high (HDI) drought intensity (1986–96, 9.98 y; 1996–99, 2.62 y). Mean annual drought intensity was two-fold higher in the HDI than LDI period (1997 v. 976 mm), and each period had one moderately strong main drought (viz. 1992, 1998). Mortality of ‘all’ trees ≥10 cm gbh (girth at breast height) and stem growth rates of ‘small’ trees 10–<50 cm gbh were measured in sixteen 0.16-ha subplots (half on ridge, half on lower slope sites) within two 4-ha plots. These 10–50-cm trees were composed largely of true understorey species. A new procedure was developed to correct for the effect of differences in length of census interval when comparing tree mortality rates. Mortality rates of small trees declined slightly but not significantly between the LDI and HDI periods (1.53 to 1.48% y−1): mortality of all trees showed a similar pattern. Relative growth rates declined significantly by 23% from LDI to HDI periods (11.1 to 8.6 mm m−1 y−1): for absolute growth rates the decrease was 28% (2.45 to 1.77 mm y−1). Neither mortality nor growth rates were significantly influenced by topography. For small trees, across subplots, absolute growth rate was positively correlated in the LDI period, but negatively correlated in the HDI period, with mortality rate. There was no consistent pattern in the responses among the 19 most abundant species (n≥50 trees) which included a proposed drought-tolerant guild. In terms of tree survival, the forest at Danum was resistant to increasing drought intensity, but showed decreased stem growth attributable to increasing water stress.

Estimating larval fish growth under size-dependent mortality: a numerical analysis of bias

2007 ◽  
Vol 64 (3) ◽  
pp. 554-562 ◽  
Author(s):  
Tian Tian ◽  
Øyvind Fiksen ◽  
Arild Folkvord
Keyword(s):  
Growth Rate ◽  
Longitudinal Data ◽  
Growth Rates ◽  
Mortality Rates ◽  
Growth Patterns ◽  
Cross Sectional ◽  
Larval Phase ◽  
Size Dependent ◽  
Recruitment Success ◽  
Dependent Mortality

The early larval phase is characterized by high growth and mortality rates. Estimates of growth from both population (cross-sectional) and individual (longitudinal) data may be biased when mortality is size-dependent. Here, we use a simple individual-based model to assess the range of bias in estimates of growth under various size-dependent patterns of growth and mortality rates. A series of simulations indicate that size distribution of individuals in the population may contribute significantly to bias in growth estimates, but that typical size-dependent growth patterns have minor effects. Growth rate estimates from longitudinal data (otolith readings) are closer to true values than estimates from cross-sectional data (population growth rates). The latter may produce bias in growth estimation of about 0.03 day–1 (in instantaneous, specific growth rate) or >40% difference in some situations. Four potential patterns of size-dependent mortality are tested and analyzed for their impact on growth estimates. The bias is shown to yield large differences in estimated cohort survival rates. High autocorrelation and variance in growth rates tend to increase growth estimates and bias, as well as recruitment success. We also found that autocorrelated growth patterns, reflecting environmental variance structure, had strong impact on recruitment success of a cohort.

Estimation of salmonid habitat growth potential through measurements of invertebrate food abundance and temperature

2014 ◽  
Vol 71 (8) ◽  
pp. 1158-1170 ◽  
Author(s):  
Nicholas Weber ◽  
Nicolaas Bouwes ◽  
Chris E. Jordan
Keyword(s):  
Food Availability ◽  
Growth Rates ◽  
Food Abundance ◽  
Fish Growth ◽  
Growth Potential ◽  
Habitat Characteristics ◽  
Physical Habitat ◽  
Bioenergetics Model ◽  
Adequate Food ◽  
Consumption Rates

Criteria used to characterize lotic salmonid habitat suitability are often based on correlations between physical habitat characteristics and salmonid abundance. Focusing on physical habitat features ignores other habitat components, such as an adequate food supply, that limit the amount of energy available for growth and survival. We tested the degree that food availability and temperature influence lotic salmonid consumption and growth rates and outline an approach for assessing habitat quality based on measurements of these features. We collected benthic and drifting invertebrate abundances, stream temperatures, and juvenile steelhead – rainbow trout (Onchorhynchus mykiss gairdneri) summer growth rates among nine stream segments in central Oregon. Stream temperatures and growth rates were used in bioenergetics model simulations to estimate O. mykiss consumption rates. The variation in O. mykiss consumption rates was explained by measurements of total drift biomass along a type II predator response curve (R2 = 0.71). This simplified foraging relationship between food abundance and consumption is then used to estimate the consumption component of the bioenergetics model to allow estimation of salmonid growth potential. Validation of the growth potential model produced reasonably accurate estimates of fish growth rates at reaches within the study area and precise but biased estimates in novel systems. While additional reach-level habitat information may be required to make the model more generalizable, the assessment of invertebrate food availability offers a simple yet powerful approach for describing the growth potential of stream habitat.

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