LEPORINUS FRIDERICI PDF

Leporinus frederici (Bloch, ) Leporinus friderici friderici (Bloch, ) Salmo friderici Bloch, BioLib link: Leporinus friderici · FishBase. Dorsal soft rays (total): 12; Anal soft rays: Scales in lateral line 35 + circumpeduncular 16; profile over orbits flat; teeth in the upper jaw 4 + 4, the cutting. Leporinus friderici (Bloch, ) (Characiformes, Anostomidae) is a freshwater fish commonly called “piava” or “piau-três-pintas” widely.

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The worldwide demand for water and power generation has dramatically increased the risks for freshwater ecosystems. Academic Press, London, p.

Human uses

The breeding sites selected by the populations of L. These effects frirerici diminish human wellbeing by decreasing the services that ecosystems can provide for people Millennium Lepodinus Assessment It was concluded that reproductive strategies constitute ecological adaptations that are temporally and spatially altered and are fitted to resource availability and environmental pressure.

Specimens were sexed and the state of gonadal maturation was estimated by macroscopic inspection of the gonads Vazzoler, Statistical differences in infracommunity diversity Shannon-Wiener index among host populations from the three tributaries were tested using the Kruskal-Wallis test Zar To describe the component community, the total number of species of parasite, the total number of individual parasites, the Shannon-Wiener index H’which gives equal weight to rare and abundant species, the Simpson index 1-D which is sensitive to changes in the most abundant species composition, the Pielou evenness index J leporimus, and the Berger-Parker index BPwhich evaluates uniformity among the component community were employed Magurran The formation of Itaipu Reservoir had a greater effect on the reproduction of L.

You must be logged in to post a comment. Eight parasite species were shared among the tributaries Table I. Subadult from the rio Xingu. Anostomidae from eastern basins of Brazil, leprinus redescription of L.

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Leporinus friderici, Threespot leporinus : fisheries, aquaculture

Unfortunately, freshwater ecosystems are undergoing abrupt ecological changes caused by increasing dam construction. The Jurumirim dam was built in the late s and is the first of 11 cascading dams along the main course of the Paranapanema River Nogueira et al.

Leporinus Agassiz Considering the biotic homogenization effect of dams, the present study hypothesizes that the Jurumirim Dam homogenizes the parasitic fauna of L. River Res Appl Mechanisms of species coexistence: Anadromous sea lampreys recolonize a marine coastal river tributary after dam removal.

Threespot Leporinus

Information from such studies may also be useful in evaluating the evolutionary pattern and the ecological relationships which make it possible for a species to survive in these environments. In Itaipu the maximum and minimum mean lengths at first maturation stabilized following year 6 after closure, and continued through year Proc Natl Acad Sci Endemic species are replaced by cosmopolitan species with the result that entire ecosystems come to resemble each other RahelScott This might be explained by three suppositions: In response to environmental stressors, fish parasite communities can increase or decrease prevalence, abundance and diversity Lafferty and Kuris On the other hand, the costs of fecundity influence directly or indirectly the availability of energy for future reproduction.

Urbanization as a major cause of biotic homogenization. Homogenization of freshwater faunas. These events may dramatically alter the way the ecosystem behaves and are mirrored by changes in the diversity of wildlife communities and their parasite populations.

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Homogenization of regional river dynamics by dams and global biodiversity implications. The reproductive strategy of a species depends upon the interaction between intrinsic and extrinsic factors.

In aquatic environments, the expression of the elporinus strategy of a species depends on the interaction between intrinsic factors, such as the metabolism of the organisms themselves, and extrinsic factors resulting from existing environmental conditions, such as the quality of reproductive habitats and interspecific relationships, as well as physical factors and flood regimes Nikolsky, ; Lowe-McConnel, ; Wootton, Parasitology friddrici ecology on its own terms: Dams usually affect the ecological and evolutionary processes of resident biota by modifying and replacing the function and diversity of river habitats Poff et al.

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Summary page Point data Common names Photos.

Samplings of hosts were carried out between April and June using gillnets of different mesh sizes and with standardized effort in three upstream tributaries under the influence of the Jurumirim Dam: Oliver and Boyd, p. Two new species of Leporinus Characiformes: Estimates of some properties based on models Phylogenetic diversity index Ref.

Estimating the extent of terrestrial biodiversity through extrapolation.

In addition, these impacts on landscape structure change the natural disturbance regime of the river and, are usually described as one of the major reasons for freshwater biotic homogenization Mckinney Both populations showed differences in the sex ratios in the shorter and longer length classes, females being longer than males Fig.

Nevertheless, the same pattern could not be demonstrated in Itaipu, that is the variations in the physical condition of the species could not be attributed to changes in fridfrici breeding season, but coincided only with the spawning sites, possibly reflecting the availability of food in the environment.