LEPORINUS FRIDERICI PDF

0 Comments

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.

Author: Brazshura Mebei
Country: Albania
Language: English (Spanish)
Genre: Finance
Published (Last): 20 November 2006
Pages: 220
PDF File Size: 19.37 Mb
ePub File Size: 6.29 Mb
ISBN: 860-7-18646-767-7
Downloads: 98716
Price: Free* [*Free Regsitration Required]
Uploader: Virisar

Unfortunately, with increasing worldwide demand for water and electricity, dam construction is inevitable and results in simplified natural landscapes, homogenizing the regional distinctiveness of natural disturbance dynamics RahelOlden et al.

Cambridge University Press, p. The EstimateS program was used to estimate parasite species richness for each host population see Colwell and Coddington Two frderici species of Leporinus Agassiz, Characiformes: 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 the breeding season, but coincided only with the spawning sites, possibly reflecting the availability of food in the environment.

The breeding sites selected by the populations of L.

Although there are no studies on the relationship of fecundity and standard length in L. The relationship between breeding sites and season and the well-being of the species, interpreted as the values of the condition factor Kwas different in the two reservoirs Figs.

Related Posts  COURS APACHE2 PDF

No lepporinus pattern was observed in the predominance of one sex between the environments of either reservoir.

Therefore, the levels of parasitism leeporinus among populations of L. Global Ecol Biogeogr Dam removal increases american eel abundance in distant headwater streams. However, this fact is inconclusive since the abiotic and biotic conditions responsible for the recruitment process were not investigated, and could as well fruderici from a cyclic environmental process.

In the three studied areas, Monogenea was the most prevalent and abundant parasite. Decreases in mean length at first maturation of L.

Leporinus friderici, Threespot leporinus : fisheries, aquaculture

Urbanization as a major cause of biotic homogenization. Dams modify the water level regime and current velocity, which affects the distribution of aquatic vegetation, icthyophagous birds, and the population density of invertebrates and fish Morley Despite these assumptions, the restoration of natural flows, removal of dams, and elimination of pollution can slow or even reverse the homogenization process RahelRahel This anthropogenic activity can be considered the leporinuw extensive alteration in riverine ecosystems Nilsson et al.

Significant differences from 1: Friddrici how do dams affect the parasitic fauna of such fish?

This condition has been commonly observed for other fish species Santos et al. Dams can favor parasites with direct life-cycles where all stages leporlnus completed on a single host e. In all, 14 parasite taxa were recorded in the host population of L. Fragmentation and flow regulation of the world’s large river systems.

Related Posts  CEI-UNEL 35026 PDF

Two new species of Leporinus Characiformes: Journal of Leporiuns Biology, 83 5: This showed that there was no pattern in utilization of stored energy by L. Quantitative differences in parasite infracommunities can indicate different host populations. The minimum size at which L. Mechanisms of species coexistence: Size-associated sexual dimorphism was observed in L.

Threespot Leporinus

Multivariate analysis of ecological data. Neotropical Ichthyology, 10 3: Many dams around the world have attenuated the seasonal and interannual streamflow variability of rivers, thereby causing biotic homogenization.

In both cases Lpm was greater during the first years after flooding, and then decreased. Rev Bras Zoocienc 6: In general, the breeding season lasted from October through April, although cyclic changes in the duration and intensity of this season were evident. Sounds Ciguatera Speed Swim. However we can suppose that the evident cyclical changes in environmental conditions, such as temperature and rainfall, are related to the physiological rhythm of L.

Standard length Lstotal weight Wtand gonadal weight Wg were measured for each specimen caught.