Development and Stability of Fish Assemblages after Lime Treatment

1991 ◽  
Vol 48 (4) ◽  
pp. 546-554 ◽  
Author(s):  
Magnus Appelberg ◽  
Erik Degerman
Keyword(s):  
Species Interactions ◽  
Fish Assemblages ◽  
Negative Relationship ◽  
Habitat Diversity ◽  
Long Term Effects ◽  
Lime Treatment ◽  
Physical And Chemical Variables ◽  
Physical And Chemical ◽  
Species Proportions

Long-term effects of limestone treatment on fish populations in acidified lakes in Sweden have been examined since 1983 to assess the development and stability of fish assemblages after lime treatment. In total, 77 lakes were sampled twice using standardized methods between 1983 and 1988. The lakes were limed 1–16 yr before the second sampling. Physical and chemical variables and the fish data were reduced using PCA ordination and the resulting relationships were analyzed using linear regression and ANOVA. Relationships between the fish assemblage characteristics and the environmental factors were highly dependent on the species composition of the assemblages. The number and diversity of fish species were correlated with both the extent of acidification and habitat diversity of the lakes. The importance of species interactions after lime treatment was suggested by a negative relationship between changes in the scores of community along the first component of the fish PCA and changes along two of the other species components between the two samplings. Despite a weak tendency towards reduced variability in species proportions as time passed since the first liming, the development of community stability, expressed as lack of change in species proportions, was insignificant.

scholarly journals Changes in ichthyofauna composition along a gradient from clearwaters to blackwaters in coastal streams of Atlantic forest (southeastern Brazil) in relation to environmental variables

2012 ◽  
Vol 10 (3) ◽  
pp. 675-684 ◽  
Author(s):  
Cristina da Silva Gonçalves ◽  
Francisco Manoel de Souza Braga
Keyword(s):  
Atlantic Forest ◽  
Fish Assemblages ◽  
Habitat Characteristics ◽  
Southeastern Brazil ◽  
Fish Samples ◽  
Spatial Differences ◽  
Coastal Streams ◽  
Longitudinal Variations ◽  
Physical And Chemical Variables ◽  
Physical And Chemical

The lack of knowledge of the freshwater ichthyofauna of coastal streams in the State of São Paulo (Brazil) is a cause of concern, as these streams are inserted in the Atlantic forest, a hotspot highly threatened. The aim of the present study is to investigate the freshwater ichthyofauna composition of clear and blackwater streams in a preservation area of Brazilian Atlantic forest. Fish samples were taken using electrofishing. A total of 20 species were registered, with Astyanax ribeirae, Hollandichthys multifasciatus, and Mimagoniates microlepis (Characiformes, Characidae) as the more representative. In general, the observed pattern of occurrence and distribution of fish species varied according to habitat characteristics, due to the longitudinal gradient in clearwaters, and among clearwaters and blackwaters. In clearwater streams, the headwater stretches had lower species diversity, while the opposite occurred in the middle and lower sites. These longitudinal variations of ichthyofauna were related with habitat characteristics (depth, stream flow, and bottom type) in which they were found, since the diversity of habitats was higher in headwaters and lower in downstream reaches (middle and lower sites). The physical and chemical variables of water do not seem to have influenced the distribution of species in clearwater streams, but the clear and blackwater fish composition was influenced mainly by pH concentration. Unlike the spatial differences, significant temporal differences were not registered in fish assemblages, probably due to the absence of a pronounced dry season in the studied region.

Environmental dissimilarity over time in a large subtropical shallow lake is differently represented by phytoplankton functional approaches

2018 ◽  
Vol 69 (1) ◽  
pp. 95 ◽  
Author(s):  
Juliana E. Bohnenberger ◽  
Lúcia R. Rodrigues ◽  
David da Motta-Marques ◽  
Luciane O. Crossetti
Keyword(s):  
Shallow Lake ◽  
Functional Group ◽  
Environmental Variability ◽  
Life Forms ◽  
Total Biomass ◽  
Coastal Lake ◽  
Effective System ◽  
Physical And Chemical Variables ◽  
Physical And Chemical

The aim of the present study was to understand how different phytoplankton functional approaches responded to environmental variability in a large shallow lake, namely Lake Mangueira, in southern Brazil. This coastal lake has a maximum depth of 7m and is ~90km long and ~3–10km wide. Physical and chemical variables, maximum linear dimension, life forms, functional and morphofunctional groups of phytoplankton were analysed. The results showed that the phytoplankton were primarily comprised Cyanobacteria (63.9%), followed by middle-sized algae (21–50μm; 46.7%) and colonial non-flagellated taxa (63%). The highest percentage of total biomass was accounted for by the functional group ‘K’ (as classified by Reynolds et al. 2002; 36.3%), large mucilaginous colonies (46.79%) according to morphologically based functional classification and other large colonies (mostly non-vacuolated; 36.7%) according to morphofunctional classification. Dissimilarity analysis indicated a significant correlation between abiotic data and functional approaches (P=0.001). The dissimilarity in the functional compositions of phytoplankton was related to nutrient and light conditions, especially to silicon content and water transparency, in all functional approaches. The highest correlation with abiotic variables was seen for morphologically based functional group community structure, although the functional group composition of phytoplankton sensu Reynolds et al. seemed to be the most effective system in describing environmental variability in Lake Mangueira over the long term.

scholarly journals Stream fish from recently deforested basins in the Meridional Amazon, Mato Grosso, Brazil

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Lilian Casatti ◽  
Gabriel Lourenço Brejão ◽  
Fernando Rogério Carvalho ◽  
Hugmar Pains da Silva ◽  
María Angélica Pérez-Mayorga ◽  
...  
Keyword(s):  
Native Species ◽  
Fish Assemblages ◽  
Production Systems ◽  
Riparian Forest ◽  
Stream Fish ◽  
Generic Level ◽  
Mato Grosso ◽  
Physical And Chemical Variables ◽  
Forest Streams ◽  
Physical And Chemical

Abstract: The replacement of tropical forests to production systems is one of the leading causes of riverine ecosystem alterations. However, current assemblages’ composition may also result from the time since these transformations have begun. Therefore, the knowledge of diversified historical scenarios can facilitate the accomplishment of actions that involve the aquatic environments recovery. In this study, an inventory of stream fish was carried out in basins whose deforestation was intensified in the last 20 years, to compose a baseline for ecological and taxonomic studies. The habitat, physical and chemical variables, and the fish assemblages from 60 streams in the northwest region of the state of Mato Grosso, in the Aripuanã and Juruena river basins, were sampled with standardized procedures. For a total of 130 species, a numerical predominance of small-sized Characidae and great rarity were registered, with 50 species represented by less than ten individuals and 19 singletons. Approximately 15% of the sampled taxa were identified only at the generic level, and for several taxa, more detailed taxonomic and molecular studies are required in order to achieve satisfactory identifications. None threatened species were so far reported. On the other hand, two specimens of non-native species were sampled. Although habitat quality is higher in forested streams, no differences in the species richness were registered when compared to the pasture with riparian forest streams or to more deforested streams. However, abundance was greater in these last two streams groups as a result of small-sized characins dominance.

scholarly journals Nanoparticles in Construction Materials and Other Applications, and Implications of Nanoparticle Use

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3052 ◽  
Author(s):  
Mohajerani ◽  
Burnett ◽  
Smith ◽  
Kurmus ◽  
Milas ◽  
...  
Keyword(s):  
Ultrafine Particles ◽  
Construction Materials ◽  
Chemical Properties ◽  
Environmental Safety ◽  
Long Term Effects ◽  
Potential Benefits ◽  
Production Quantity ◽  
The Many ◽  
Physical And Chemical

Nanoparticles are defined as ultrafine particles sized between 1 and 100 nanometres in diameter. In recent decades, there has been wide scientific research on the various uses of nanoparticles in construction, electronics, manufacturing, cosmetics, and medicine. The advantages of using nanoparticles in construction are immense, promising extraordinary physical and chemical properties for modified construction materials. Among the many different types of nanoparticles, titanium dioxide, carbon nanotubes, silica, copper, clay, and aluminium oxide are the most widely used nanoparticles in the construction sector. The promise of nanoparticles as observed in construction is reflected in other adoptive industries, driving the growth in demand and production quantity at an exorbitant rate. The objective of this study was to analyse the use of nanoparticles within the construction industry to exemplify the benefits of nanoparticle applications and to address the short-term and long-term effects of nanoparticles on the environment and human health within the microcosm of industry so that the findings may be generalised. The benefits of nanoparticle utilisation are demonstrated through specific applications in common materials, particularly in normal concrete, asphalt concrete, bricks, timber, and steel. In addition, the paper addresses the potential benefits and safety barriers for using nanomaterials, with consideration given to key areas of knowledge associated with exposure to nanoparticles that may have implications for health and environmental safety. The field of nanotechnology is considered rather young compared to established industries, thus limiting the time for research and risk analysis. Nevertheless, it is pertinent that research and regulation precede the widespread adoption of potentially harmful particles to mitigate undue risk.

scholarly journals Can dams affect the trophic structure of ichthyofauna? A long-term effects in the Neotropical region

2018 ◽  
Vol 108 (0) ◽  
Author(s):  
Felipe P. de Lima ◽  
André B. Nobile ◽  
Diogo Freitas-Souza ◽  
Edmir D. Carvalho ◽  
Ana P. Vidotto-Magnoni
Keyword(s):  
Power Plants ◽  
Trophic Structure ◽  
Fish Assemblages ◽  
Feeding Activity ◽  
Fish Fauna ◽  
Neotropical Region ◽  
Hydroelectric Power ◽  
Long Term Effects ◽  
Aquatic Communities

ABSTRACT Dams are considered an important source of modification upon the structure of aquatic communities and their reflexes are diverse on the fish fauna. Although there are several hydroelectric power plants in Brazil, the long-term effects on feeding activity of ichthyofauna are unknown. Thus, this study aimed to investigate the long-term effects of an old reservoir (fifty years) on the trophic dynamics of fish fauna. The diet of 20 fish species was analyzed, identifying 37 food items belonging to six trophic categories, which enable to create six trophic groups. The results found here suggests that throughout the creation of a reservoir, the trophic structure of the fish assemblages tend to reach trophic homeostasis, in which the fish community will be capable of exploring the most available food resources being maintained primarily by the items placed in the categories organic matter and fragments of fish and vegetal.

scholarly journals Long-term effects of tidal restriction on fish assemblages in east Atlantic coastal marshlands

2016 ◽  
Vol 543 ◽  
pp. 209-222 ◽  
Author(s):  
R Moreno-Valcárcel ◽  
FJ Oliva-Paterna ◽  
S Bevilacqua ◽  
A Terlizzi ◽  
C Fernández-Delgado
Keyword(s):  
Fish Assemblages ◽  
Long Term Effects ◽  
East Atlantic ◽  
Tidal Restriction ◽  
Coastal Marshlands ◽  
Atlantic Coastal

The relative contribution of short-term versus long-term effects in shrub-understory species interactions under arid conditions

Oecologia ◽  
2015 ◽  
Vol 180 (2) ◽  
pp. 529-542 ◽  
Author(s):  
Zouhaier Noumi ◽  
Mohamed Chaieb ◽  
Yoann Le Bagousse-Pinguet ◽  
Richard Michalet
Keyword(s):  
Species Interactions ◽  
Long Term Effects ◽  
Short Term ◽  
Understory Species ◽  
Relative Contribution ◽  
Arid Conditions

scholarly journals Long-term effects of the 1998 coral bleaching event on reef fish assemblages

2006 ◽  
Vol 315 ◽  
pp. 237-247 ◽  
Author(s):  
KC Garpe ◽  
SAS Yahya ◽  
U Lindahl ◽  
MC Öhman
Keyword(s):  
Reef Fish ◽  
Coral Bleaching ◽  
Fish Assemblages ◽  
Bleaching Event ◽  
Long Term Effects

scholarly journals Influence of soil physical and chemical variables on species composition and richness of plants in the arid region of Tabuk, Saudi Arabia

2017 ◽  
Vol 36 (2) ◽  
pp. 112-120 ◽  
Author(s):  
Khalid Awadh Al-Mutairi
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Plant Species ◽  
Negative Relationship ◽  
Floristic Composition ◽  
Species Group ◽  
Sodium Sulphate ◽  
Northwestern Part ◽  
Physical And Chemical Variables ◽  
Physical And Chemical

Abstract The present study aims to investigate the effect of soil physical and chemical variables on the species richness and the floristic composition in four sites (Alwaz, Alqan, Sharma and Zetah) of Tabuk region in the Northwestern part of Arabian Peninsula. Only organic matter (OM), pH and calcium (Ca) showed significant differences (P < 0.05) amongst the four studied sites. Only magnesium and sodium were selected in the forward regression model and showed to be strong drivers of species richness of plants in Tabuk region (Adj-R2 = 0.438, F2,13 = 6.85, P = 0.009). The multivariate analysis of canonical correspondence analysis (CCA ) was applied to reveal the effect of the physical and chemical variables on the species composition of the plants. The CCA classifies the plant species into three groups based on their preference to the environmental variables. The first group of plant species (Group 1) is characterised by positive preference to the chloride (Cl) and negative relationship with OM and pH. The second group (Group 2) is positively correlated with most of the soil variables such as OM, calcium (Ca), potassium (K), bicarbonate (HCO3), electrical conductivity (EC), sulphate (SO4) and sodium (Na). The third group (Group 3) has positive relationship with carbonate (CO3) and negative relationship with EC and magnesium (Mg). The chloride, sodium, sulphate, EC and carbonate are the main environmental factors influencing the plant species composition in Tabuk region. The cluster analysis based on the Euclidian measure shows that Alqan and Zetah have closer species composition compared to Sharma.

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