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Search Results: 1 - 10 of 66 matches for " pimelodus ornatus "
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Spasskyellina mandi n. sp. (Proteocephalidea: Monticelliidae), parasite of Pimelodus ornatus Kner, 1857 (Pisces: Pimelodidae) of the Paraná River, Paraná, Brazil
Pavanelli, Gilberto C;Takemoto, Ricardo M;
Memórias do Instituto Oswaldo Cruz , 1996, DOI: 10.1590/S0074-02761996000600013
Abstract: spasskyellina mandi n. sp. (proteocephalidea: monticelliidae) is described from the siluriform fish pimelodus ornatus kner, 1857, caught in the paraná river, paraná, brazil. the new species differs from other species of the same genus mainly by a fewer number of testes and by a larger osmoregulatory canal. this is the second species of proteocephalidean cestode collected in p. ornatus.
Variación geográfica en Liolaemus ornatus Koslowsky (Sauria: Iguanidae)
Pereyra, Enrique A.
Cuadernos de Herpetología , 1986,
Abstract: Through an statistical analysis of simple lineal regression, the geographical variation of the latitude of the iguanid Lizard Liolaemus ornatus Koslowsky was proved. It varies from North to Couth, diminishing in number of the following characters: scales around the middle of the body in the male and female, and frontal scales in females; increasing in number the paralabials scales in contact with the right subocular and the left paralabials scales both in male and female, together with the right paralabials scales in males.
Structural chromosome polymorphism in a Pimelodus maculatus La Cepède, 1803 population (Siluriformes, Pimelodidae) from the Paranapanema River basin, PR, Brazil
Mazzuchelli, J.;Swar?a, AC.;Dias, AL.;
Brazilian Journal of Biology , 2007, DOI: 10.1590/S1519-69842007000500018
Abstract: in the present cytogenetic study of pimelodus maculatus, 13 specimens (8 males and 5 females) from the congonhas stream in paraná state, brazil, were examined using conventional staining. all of them showed a karyotype of 2n = 56, with a chromosome distribution of 20m + 20sm + 10st + 6a. however, four individuals (2 males and 2 females) were found to have a variant karyotype (cytotype) with two heteromorphic chromosomes in the group of submetacentric chromosomes - one of them corresponds to the second largest chromosome of this group and the other is a chromosome of small size. this variation suggests the existence of a structural polymorphism in the studied population.
CARACTERIZACIóN DE MICROORGANISMOS ASOCIADOS A LA DESCOMPOSICIóN DE HOJAS CONSUMIDAS POR Tremarctos ornatus (URCIDAE) Y POSIBLE RELACIóN EN SU DATACIóN
FIERRO TOSCAZO,YUSLENI; RUDAS BURGOS,EDUARDO; LARA,CATALINA; PINZóN,MARíA ALEJANDRA; SáNCHEZ,JIMENA;
Acta Biológica Colombiana , 2007,
Abstract: we established basis for a datetelling method of leaves (tillandsia spp.) consumed by tremarctos ornatus by determining or detecting the presence of microorganisms. we used samples from the field that corresponded to different states of decomposition. the samples (2 cm from the leaf base consumed by the animal) were processed in the laboratory, characterized and determined. cocobacilli (pseudomonas sp.) and negative bacilli gram were the most common bacteria morphotypes, the first were founded on samples from all ages and the second on samples no older than six months. positive cocobacili gram (bacillus sp.); were just present in samples between one and three months old. positive gram bacilli occurred only in samples no older than a month, cocos and diplococos in samples between five and six months. four fungus morphotypes were found, two of them being mucor sp., and trichoderma sp., in addition to epicoccum sp., alternaria sp., rhizoctonia sp. trichoderma was associated with at least one more kind of fungus, for samples to older than one month, but no older than five months.
Registros de ocurrencia del oso andino (Tremarctos ornatus Cuvier, 1825) en sus límites de distribución nororiental y austral
Del Moral Sachetti,J. Fernando; Lameda Camacaro,Fátima I;
Revista del Museo Argentino de Ciencias Naturales , 2011,
Abstract: the knowledge of the andean bear's (tremarctos ornatus) distribution is fundamental for evaluating the status of the species and the development of conservation measures such as the declaration of new conservation areas or the implementation of the management measures. this study aimed perform some field assessments between the years 2007 and 2008, in the andean north eastern and southern limits of the species' range, using the method of tracking mountain ridges to obtain first hand data on the presence / absence of the andean bear in these areas. we have obtained 101 current records of the species, including the central-western of venezuela and the northwest tip of argentina. finally, we discuss the biogeographic implications of the reported data.
Carcterización de microorganismos asociados a la descomposición de hojas consumidas por Tremarctos ornatus (Urcidae) y posible relación en su datación Characterization of Microorganisms Associated to Leave Decomposing Comsumed by Tremarctos ornatus (Urcidae) and Its Possible Data Relation
Fierro Toscazo Yusleni,Rudas Burgos Eduardo,Lara Catalina,Pinzón María Alejandra
Acta Biológica Colombiana , 2007,
Abstract: Se establecieron bases para un método de datación de hojas consumidas por Tremarctos ornatus, con base a la presencia de microorganismos aislados de restos vegetales de las hojas de Tillandsia spp. recogidos en campo, correspondientes a diferentes etapas de descomposición. Las muestras (2 cm de la base de la hoja consumida por el animal) fueron procesadas en el laboratorio para el aislamiento y caracterización de los microorganismos presentes, encontrando que los morfotipos bacterianos predominantes fueron cocobacilos (Pseudomonas sp.) y bacilos Gram negativos, (los primeros se encontraron en todas las edades de descomposición y los segundos solo en las muestras menores a seis meses). Morfotipos correspondientes a cocobacilos Gram positivos solo se encontraron en hojas entre 13 meses y bacilos Gram positivos (Bacillus sp.) en hojas de menos de un mes. Cocos y diplococos Gram positivos solo se presentaron en la muestra de hoja con 56 meses de descomposición. Se encontraron cuatro morfotipos de hongos, dos corresponden a Mucor sp. y Trichoderma sp., además de Epicoccum sp., Alternaria sp., Rhizoctonia sp. El género Trichoderma sp. se encontró asociado a por lo menos uno de los morfotipos anteriormente mencionados en rastros mayores de un mes e inferiores a cinco meses. We established basis for a datetelling method of leaves (Tillandsia spp.) consumed by Tremarctos ornatus by determining or detecting the presence of microorganisms. We used samples from the field that corresponded to different states of decomposition. The samples (2 cm from the leaf base consumed by the animal) were processed in the laboratory, characterized and determined. Cocobacilli (Pseudomonas sp.) and negative bacilli Gram were the most common bacteria morphotypes, the first were founded on samples from all ages and the second on samples no older than six months. Positive cocobacili Gram (Bacillus sp.); were just present in samples between one and three months old. Positive Gram bacilli occurred only in samples no older than a month, cocos and diplococos in samples between five and six months. Four fungus morphotypes were found, two of them being Mucor sp., and Trichoderma sp., in addition to Epicoccum sp., Alternaria sp., Rhizoctonia sp. Trichoderma was associated with at least one more kind of fungus, for samples to older than one month, but no older than five months.
Cytogenetic study of two species of the family Pimelodidae (Siluriformes) collected in lago Guaíba, Rio Grande do Sul, Brazil
Treco, Fernando Rodrigo;Malabarba, Luiz R.;Giuliano-Caetano, Lucia;Dias, Ana Lúcia;
Neotropical Ichthyology , 2008, DOI: 10.1590/S1679-62252008000100010
Abstract: a cytogenetic study was conducted on specimens of parapimelodus nigribarbis and pimelodus maculatus collected in the lago guaíba drainage, porto alegre, rio grande do sul, brazil. the two species had a diploid number of 56 chromosomes, with p. nigribarbis showing a karyotype of 20m + 20sm + 4st + 12a with fn of 100, and p. maculatus showing a karyotype of 24m + 20sm + 6st + 6a with fn of 106. nors were demonstrated in both species in only one pair of subtelocentric chromosomes, in the terminal region of the long arm, which was coincident with c- banding and cma3 staining, while dapi staining was negative in these regions. parapimelodus nigribarbis had a greater number of heterochromatic bands than did p. maculatus, which were distributed mainly in the terminal regions, where the latter species showed an interstitial band on the short arm of the first metacentric pair. c-banding plus cma3 demonstrated heterochromatin that was associated with gc-rich nors in both p. nigribarbis and p. maculatus, although other fluorescent regions were also observed in the former species. with c-banding plus dapi, various chromosomal regions were stained in the two species, along with interstitial staining in p. maculatus, indicating that heterochromatin contained a greater quantity of at-rich regions.
Caracterización bioecológica y poblacional de tres comunidades de crustáceos decápodos en la costa Noroccidental del estado Sucre, Venezuela
Moreno,Carlos; Graziani,César; Nú?ez,José G; Villaroel,Elvis;
Zootecnia Tropical , 2011,
Abstract: the development of a fishery industry in any country requires biological, ecological and marketing studies about the natural source to be exploited. in this sense, decapods crustaceans in the communities of punta araya, chacopata and playa patilla in sucre state-venezuela were studied for thirteen months. a total of 1826 crabs, belonging to 7 families, including 16 species and 1 subspecies, were collected. crab biodiversity, equivalence, abundance, dominance, permanence and affinity amongst the 3 localities, as well as the gender proportion and population recruitment of the 3 main crab species present at each locality were analyzed. crab total biodiversity was 1,22 bits/ind., equivalence oscillated between 0,16 y 0,85; abundance varied from 0,27 to 1,36. the species callinectes ornatus was the unique species constantly found on the communities studied and also the more abundant on each locality; showing an average value of 79,63% and a gender proportion of 1:1. the average crabshells length and biomass were 65,12 mm ± 22,03 and 20,91g ± 18,87, respectively; both parameters showed higher for the male than female gender. a comparison of the growth equation obtained indicate that c. ornatus has a major alometric growth with recruitment all over the year but showing two main peaks on march and october. the physic-chemical parameters were similar for the three localities studied, except during the upwelling periods where the phytoplankton blooms providing higher food availability not only for crab larvae development but also for many other organisms. the crab c. ornatus might become an important element of basic fisheries that could contribute to improve the socio-economic status of the fishery communities settled on the east coast of venezuela; however, it is necessary to carry out additional biological studies in order to achieve potential steady fisheries.
REPRODUCCIóN Y HáBITOS ALIMENTICIOS DEL NICURO, PIMELODUS BLOCHII (VALENCIENNES, 1840) (PISCES: PIMELODIDAE), EN LA CIéNAGA DE CACHIMBERO, RíO MAGDALENA, COLOMBIA
López-Casas,Silvia; Jiménez-Segura,Luz F.;
Actualidades Biológicas , 2007,
Abstract: we analyzed trophic and reproductive aspects of pimelodus blochii in the cachimbero floodplain lake (magdalena river basin, colombia) in three raining periods of year 2003. we collected 384 individuals with a total biomass of 31.4 kg and a standard length (ls) interval between 52.4 and 253.0 mm. differences were not observed neither on the catches among three periods of the pluviometric cycle, nor among sampling stations. the allometric coefficient (b) and the condition factor did not show differences among pluviometric periods or sexes. population was mainly represented by immature individuals. on october 2003, we observed a gonadic matureness peak for females. relative number of oocytes was equal between in stomach contents, we pluviometric raining periods. sex ratio showed a greater number of females than males. females gonadosomatic and hepatosomatic relationships showed a seasonal fluctuation. found aquatic and terrestrial animal fragments of at least 16 taxa, it suggests that this species has a wide trophic niche and an a opportunistic omnivorous feeding behaviour.
Ecological and reproductive aspects of Neoechinorhynchus pimelodi Brasil-Sato & Pavanelli (Eoacanthocephala, Neoechinorhynchidae) of Pimelodus maculatus Lacépède (Siluroidei, Pimelodidae) of the S?o Francisco River, Brazil
Brasil-Sato, Marília de C.;Pavanelli, Gilberto C.;
Revista Brasileira de Zoologia , 1999, DOI: 10.1590/S0101-81751999000100002
Abstract: ecological and reproductive aspects of neoechinorhynchus pimelodi brasil-sato & pavanelli, 1998, in pimelodus maculatus lacépède, 1803 collected in the s?o francisco river during periods of drought (july 1995 and 1996) and floodings (january 1996 and 1997) of this river basin are provided. in tropical regions where the amount of rainfall alters the hydrological regimen of limnological systems water temperature has not had an important role in infections of n. pimelodi in p. maculatus. prevalence was somewhat higher during drought periods. intensity of infection varied slightly between collecting periods. mature male and female acanthocephalans were present in all periods. females were predominant. mature females were present in higher numbers during flooding periods with a corresponding decrease in juvenile acanthocephalans. recruitment and constant losses of n. pimelodi seem to be controlled by transmission mechanisms independently of density. mechanisms may consist of infected prey availability (potential intermediate hosts) and changes of preferred alimentary items in the diets of juvenile and mature p. maculatus.
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