Image of Cnesterodon decemmaculatus. Cnesterodon decemmaculatus Trusted of Cnesterodon decemmaculatus; Map of Cnesterodon decemmaculatus. Subfamily, Poeciliinae Garman, – livebearers. Genus, Cnesterodon Garman, Species, Cnesterodon decemmaculatus (Jenyns, ). Diet of Cnesterodon decemmaculatus (Jenyns, ) and Jenynsia multidentata (Jenyns, ) were analysed in Lake Rodó, an urban hypertrophic lake from.

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Cnesterodon decemmaculatus, Ten spotted live-bearer : aquarium

Body size class 3 was the only one that consumed Decapoda items, being their IIA values important only during spring A review of planktivorous fishes: Historical Biogeography of Neotropical Freshwater Fishes. On the other hand, medium size class individuals of J. At a smaller scale, such heterogeneity leads to high species endemism and significant genetic structure in Pampean species studied so far e.

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Fish play a key role in the structure of aquatic communities, exercising direct effects on their prey and indirect effects throughout the trophic web. Overall, we decemmaculahus that the major evolutionary lineages in this species are strongly related to the main Pampean drainage systems, even though stream capture events may have affected the distribution of genetic lineages among drainages.

Sea-level changes, river capture and the evolution of populations of the Eastern Cape and fiery redfins Pseudobarbus afer and Pseudobarbus phlegethonCyprinidae across multiple river systems in South Africa.


Following Abell et al. Competition in tropical stream fishes: A total of individuals of C.

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Cichlidae in the southern Pampean area. The dashed gray line indicates the distribution of Cnesterodon decemmaculatus according to Lucinda, Algae were an item only important on autumn and winter samples and principally for higher classes. Presence of Australoheros facetus Teleostei: The close relationship among haplotypes for both markers is suggestive of a shallow genealogical history for this species see below.

Phylogeography of the livebearer Xenophallus umbratilis Teleostei: Cnesterodob both cases, these haplotypes are more closely decemmaculauts to other lineages from specific drainages, and their sequence identity suggests a recent arrival in NEG.

The smallest body size class showed the lowest RI values during winter and summerwhen zooplankton items were important in its diet Cladocera and Copepoda in winter, and Rotifera in summer. According to the frequency of occurrence, the decemjaculatus items most consumed were Copepoda, Cladocera ephippial eggs and individualsalgae periphytonEphydridae, Diptera Culicidae and Hymenoptera Formicidae Tab.

Finally, we inferred the divergence times among populations and the colonization history for C. The Pampas is a Neotropical biome formed primarily by low altitude grasslands and encompasses the southernmost portion of Brazil, Uruguay, and part of Argentina.

Higher body size classes of C. Measure of “overlap” in comparative ecological studies. Diet of Cnesterodon decemmaculatus Poeciliidae and Jenynsia multidentata Anablepidae in a hypertrophic shallow lake of Uruguay.

However, from the biological standpoint, the Pampas are far from homogeneous. Predator regulation and primary production along the productivity gradient at temperate lake ecosystem.


Species occurring in the Pampa biome have been underrepresented in studies of phylogeography and conservation genetics Lawler et al. Aceito em agosto de Molecular zoogeography of freshwater fishes in the southeastern United States. Cnesterodon decemmaculatus Jenyns is endemic to the Pampa biome and is one of the most widespread freshwater fish species in this region. Stream capture also known as river capture, headwater capture, or drainage rearrangement is a geomorphological process that consists in the contact between neighboring drainages.

It is further found in the freshwater ecoregions Subtropical Potamic axis and Bonaerensean Atlanticalso in the Pampas. Please review our privacy policy. Three alternative but not exclusive scenarios that may explain the discrepancy between drainage and genetic structure are: In a general form, the repletion degree values tended to be lower than C.

The structuring role of free-floating versus submerged plants in a subtropical shallow lake. The Pampean hydrological system resulted from a long history of tectonism, climate, and sea level changes since the Neogene.

Thus, when zooplancton is consumed, fish do not need to feed large quantities of items less nutritive, as phytoplankton and detritus.