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Registros recuperados: 37 | |
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Garrone-Neto,Domingos; Sazima,Ivan. |
One hunting tactic of freshwater rays (Potamotrygonidae), termed "undulate the disc and stir substrate", is here reported to attract cichlids at two sites in the upper Paraná River. The ray species involved in such association are Potamotrygon falkneri and P. motoro, whose activity attract four cichlid species, namely Crenicichla britskii, Satanoperca pappaterra, Cichla kelberi, and Geophagus proximus, the two latter non-native species to the study area. The cichlids approach a ray when it begins to stir the substrate and form sediment clouds, and remain close to the ray during this activity only. The association is here regarded as following behavior even if very transient. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cichlidae; Feeding association; Potamotrygonidae; Hunting tactics; Southeastern Brazil. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000300018 |
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Sazima,Ivan; Carvalho,Lucélia Nobre; Mendonça,Fernando Pereira; Zuanon,Jansen. |
Resemblance to dead leaves is a well known type of camouflage recorded for several small vertebrates that dwell in the leaf and root litter on the ground. We present here instances of such resemblance in three species of nocturnal fishes (Siluriformes and Gymnotiformes) that spend the daytime among submersed root-tangle with leaf litter in Amazonian streams. All three species are very difficult to spot visually, due both to their shape and colors which blend with the substrate, as well as to the heterogeneous nature of their cover. Two species were recorded to lie on their sides, which adds to their resemblance to dead leaves. When disturbed, one species may drift like a waterlogged leaf, whereas another moves upwards the root-tangle, exposing its fore... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crypsis; Leaf resemblance; Defence against predators; Siluriformes; Gymnotiformes. |
Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000100013 |
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Zuanon,Jansen; Bockmann,Flávio A.; Sazima,Ivan. |
We studied a specialised assemblage of sand-dwelling fish species from a streamlet in central Amazonia. The five sanddwelling species comprised 15.2 % of the total number in the streamlet (33 species). Two of the sand-dwellers are daytime foragers, Characidium cf. pteroides (Crenuchidae) and Stauroglanis gouldingi (Trichomycteridae), whereas three ones are night-time foragers, Gymnorhamphichthys rondoni (Rhamphichthyidae), "Imparfinis" pristos and Mastiglanis asopos (Heptapteridae). With the exception of C. cf. pteroides, the remainder species bury in the sand during their resting period. All five species bear a cryptic, sand-colour pattern, and some are translucent, traits which we regard as advantageous both for evasion from predators and for approaching... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forest streams; Fish diversity; Phylogeny; Feeding behaviour; Drift-trap net. |
Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000100012 |
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Bockmann,Flávio A.; Sazima,Ivan. |
Trichomycterus maracaya, a new species of Trichomycteridae, is described from a streamlet in the upper rio Paraná, Poços de Caldas, State of Minas Gerais, southeastern Brazil. The following putative autapomorphies distinguishes T. maracaya from congeneric species: 1) row of lateral blotches not forming a stripe at any phase during ontogeny; 2) superficial layer of pigmentation of juveniles and large (presumably adults) specimens consisting solely of scattered chromatophores. Furthermore, the new species is characterized by a combination of yellow ground color in life and mottled pattern formed by small to medium-sized, brown, irregularly-coalescent, well-defined deeper-lying blotches, and more superficial dots on the body. Trichomycterus maracaya is... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pencil catfish; Ostariophysi; Endemic; Neotropics. |
Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252004000200003 |
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Teresa,Fabrício B.; Sazima,Cristina; Sazima,Ivan; Floeter,Sergio R.. |
We tested whether habitat, identity, size of nuclear fishes, and intensity of bottom disturbance caused by their foraging can predict the composition of fish followers in nuclear-follower feeding associations. The study was carried out in a stream of the Serra da Bodoquena, Mato Grosso do Sul State, Southwestern Brazil. We performed underwater observational sessions (total 12 h) of such interspecific interactions to obtain data about the identity and abundance of the followers in the association, as well as the identity and size of the nuclear fish. We also evaluated whether different intensities of bottom disturbance due to the nuclear fish foraging and type of habitat may influence interactions. We recorded 38 episodes involving nuclear and follower... |
Tipo: Info:eu-repo/semantics/article |
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Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000400913 |
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Caramaschi,Ulisses; Sazima,Ivan. |
Crossodactylus bokermanni, sp. n., is described from Serra do Cipó, Minas Gerais, Southeastern Brasil. The new species is characterized by the small size (20-27 mm), slender build, long legs, narrow head, long and acuminate snout, rounded but fairly defined canthus rostralis, and small tympanum. Also, notes on its habits are made and its tadpole is described. |
Tipo: Info:eu-repo/semantics/article |
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Ano: 1985 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751985000100005 |
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Caramaschi,Ulisses; Sazima,Ivan. |
Thoropa megatympanum, sp. n., is described from the Serra do Cipó, Minas Gerais, Southeastern Brasil. The new species is related to T. miliaris (Spix), from which it is readily distinguished by its smaller size, broader head, larger tympanum, shorter legs, and dorsal pattern mottled. The eggs and the tadpole are also described. |
Tipo: Info:eu-repo/semantics/article |
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Ano: 1983 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751983000300004 |
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Sazima,Ivan. |
Play is a behaviour known mostly for mammals, although birds are recorded to play as well. Here I describe the play behaviour for two bird species, the Neotropic Cormorant (Phalacrocorax brasilianus) and the Green Heron (Butorides striata) in southeastern Brazil. Juvenile and adult cormorants were recorded to manipulate sticks, leaves, rootlets, and plant debris while on the ground. They also played with sticks, leaves, pods, and plant debris, as well as live or dead fish while in the water, repeatedly grabbing the object and submerging it. When the object was a fish, they tossed it in the air as well. Juvenile herons played with small pieces of wood, fruits, and other floating objects, which they picked up and tossed repeatedly in the water. The... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aves; Phalacrocorax brasilianus; Butorides striata; Play behaviour; Object and social play; Motor training. |
Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000200025 |
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Registros recuperados: 37 | |
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