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Dataset results
39 results for “Rivulus”
FIGURE 1. Rivulus uatuman, UFRJ 6022 in Rivulus uatuman sp. n. (Teleostei: Cyprinodontiformes: Rivul idae): a new miniature killifish from the central Brazilian Amazon
FIGURE 1. Rivulus uatuman, UFRJ 6022, male, FIGURE 2. Rivulus uatuman, UFRJ holotype, 16.6 mm SL (one day after collection); 6023, female, paratype, 16.1 mm SL (one Brazil: Amazonas: Balbina: Rio Uatumã basin. day after collection); Brazil: Amazonas:
FIGURE 6 in Rivulus uakti sp. n. and R. amanapira sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new species from the upper Rio Negro, Brazilian Amazon
FIGURE 6. Brazil: Amazonas: São Gabriel da Cachoeira; type locality of Rivulus amanapira: upper rio Negro basin.
FIGURE 3 in Rivulus uakti sp. n. and R. amanapira sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new species from the upper Rio Negro, Brazilian Amazon
FIGURE 3. Brazil: Amazonas: São Gabriel da Cachoeira: upper rio Negro basin; type locality of Rivulus uakti.
FIGURE 5. Rivulus amanapira, UFRJ 5930 in Rivulus uakti sp. n. and R. amanapira sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new species from the upper Rio Negro, Brazilian Amazon
FIGURE 5. Rivulus amanapira, UFRJ 5930, female, paratype, 32.6 mm SL (two days after collection); Brazil: Amazonas: São Gabriel da Cachoeira: upper rio Negro basin.
FIGURE 2. Rivulus uakti, UFRJ 5926 in Rivulus uakti sp. n. and R. amanapira sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new species from the upper Rio Negro, Brazilian Amazon
FIGURE 2. Rivulus uakti, UFRJ 5926, female, paratype, 27.9 mm SL (two days after collection); Brazil: Amazonas: São Gabriel da Cachoeira: upper rio Negro basin.
FIGURE 1. Rivulus uakti, UFRJ 5925 in Rivulus uakti sp. n. and R. amanapira sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new species from the upper Rio Negro, Brazilian Amazon
FIGURE 1. Rivulus uakti, UFRJ 5925, male, holotype, 24.0 mm SL (two days after collection); Brazil: Amazonas: São Gabriel da Cachoeira: upper rio Negro basin.
FIGURE 4. Rivulus amanapira, UFRJ 5929 in Rivulus uakti sp. n. and R. amanapira sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): two new species from the upper Rio Negro, Brazilian Amazon
FIGURE 4. Rivulus amanapira, UFRJ 5929, male, holotype, 38.6 mm SL (one day after collection); Brazil: Amazonas: São Gabriel da Cachoeira: upper rio Negro basin.
FIGURE 7 in Rivulus berovidesi, a new killifish species (Teleostei: Rivulidae) from western Cuba
FIGURE 7. Type locality of Rivulus berovidesi sp. n. Small stream at Sierra de Cajalbana, Pinar del Rio province, Cuba
FIGURE 3 in Rivulus berovidesi, a new killifish species (Teleostei: Rivulidae) from western Cuba
FIGURE 3. Rivulus berovidesi sp. n., life coloration in both sexes in specimens kept in captivity for three months after collection in the field.
FIGURE 2 in Rivulus berovidesi, a new killifish species (Teleostei: Rivulidae) from western Cuba
FIGURE 2. Outline drawings of the frontal scalation patterns of Rivulus from Cuba. A: Rivulus berovidesi sp. n. with a d- type pattern and B: Rivulus cylindraceus with an e-type pattern. The horizontal broken line indicates the pair of scales with their margins fully exposed.
FIGURE 6 in Rivulus berovidesi, a new killifish species (Teleostei: Rivulidae) from western Cuba
FIGURE 6. Rivulus berovidesi sp. n., holotype, male, CZACC-9.83, 37.3 mm SL, small stream in Sierra de Cajalbana, Pinar del Rio province, Cuba.
FIGURE 1 in Rivulus berovidesi, a new killifish species (Teleostei: Rivulidae) from western Cuba
FIGURE 1. Distribution map of Rivulus species from Cuba. Red spots represent distribution of Rivulus cylindraceus and red triangles represents distribution of Rivulus berovidesi sp. n., 1 Sierra de Cajalbana (type locality); 2 Rio Camarones.
FIGURE 5 in Rivulus berovidesi, a new killifish species (Teleostei: Rivulidae) from western Cuba
FIGURE 5. Rivulus berovidesi sp. n., paratype, female, CZACC-9.85, 37.2 mm SL, small stream in Sierra de Cajalbana, Pinar del Rio province, Cuba.
FIGURE 4 in Rivulus berovidesi, a new killifish species (Teleostei: Rivulidae) from western Cuba
FIGURE 4. Rivulus berovidesi sp. n., life coloration in males (above) and females (below) in specimens just after collection in the field.
Data from: Convergence of life history phenotypes in a Trinidadian killifish (Rivulus hartii)
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Data from: Genetic subdivision and variation in selfing rates among Central American populations of the mangrove rivulus, Kryptolebias marmoratus
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Data from: Predator-driven brain size evolution in natural populations of Trinidadian killifish (Rivulus hartii)
Vertebrates exhibit extensive variation in relative brain size. It has long been assumed that this variation is the product of ecologically driven natural selection. Yet, despite more than 100 years of research, the ecological conditions that select for changes in brain size are unclear. Recent laboratory selection experiments showed that selection for larger brains is associated with increased survival in risky environments. Such results lead to the prediction that increased predation should favour increased brain size. Work on natural populations, however, foreshadows the opposite trajectory of evolution; increased predation favours increased boldness, slower learning, and may thereby select for a smaller brain. We tested the influence of predator-induced mortality on brain size evolution by quantifying brain size variation in a Trinidadian killifish, Rivulus hartii, from communities that differ in predation intensity. We observed strong genetic differences in male (but not female) brain size between fish communities; second generation laboratory-reared males from sites with predators exhibited smaller brains than Rivulus from sites in which they are the only fish present. Such trends oppose the results of recent laboratory selection experiments and are not explained by trade-offs with other components of fitness. Our results suggest that increased male brain size is favoured in less risky environments because of the fitness benefits associated with faster rates of learning and problem-solving behaviour.
Data from: Predator-driven brain size evolution in natural populations of Trinidadian killifish (Rivulus hartii)
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Data from: Real or fake? natural and artificial social stimuli elicit divergent behavioral and neural responses in mangrove rivulus, Kryptolebias marmoratus
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ScienceDex guides
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