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| Registros recuperados: 21 | |
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| Cornillon, Pierre-andré; Pontier, Dominique; Rochet, Marie-joelle. |
| Comparative methods are used to investigate the attributes of present species or higher taxa. Difficulties arise from the phylogenetic heritage: taxa are not independent and neglecting phylogenetic inertia can lead to inaccurate results. Within-species variations in life-history traits are also not negligible, but most comparative methods are not designed to take them into account. Taxa are generally described by a single value for each trait. We have developed a new model which permits the incorporation of both the phylogenetic relationships among populations and within-species variations. This is an extension of classical autoregressive models. This family of models was used to study the effect of fishing on six demographic traits measured on 77... |
| Tipo: Text |
Palavras-chave: Autoregressive method; Intraspecific variation; Fishing effect; Comparative method. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-682.pdf |
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| GONÇALVES,André Luiz; CASTRO,Edilene Alcântara de; LUZ,Ennio; Cancio FENDRICH,Ricardo; Araújo de SOUZA,Nataly; THOMAZ-SOCCOL,Vanete. |
| ABSTRACT Lutzomyia intermedia (Diptera: Psychodidae) features as one of the main vectors that are involved in the transmission of American cutaneous leishmaniasis (ACL) in the Neotropical region. However, genetic studies involving this taxon are still incipient and important for understanding the level of variability of different populations, their role, and implications as vectors. The aim of this study was to determine the level of genetic diversity of L. intermedia present in the Ribeira River Valley, an area of ACL transmission in the state of Paraná, Brazil, through the Random amplified polymorphic DNA (RAPD). Two municipalities were chosen to collect sand flies: Cerro Azul (new transmission area of the ACL) and Adrianópolis (endemic area of the ACL).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Intraspecific variation; Molecular epidemiology; Phenetic analysis; Phlebotominae. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2021000300365 |
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| FEIJÓ,ANDERSON; ROCHA,PATRÍCIO ADRIANO DA; FERRARI,STEPHEN F.. |
| Micronycteris is divided into four subgenera, Micronycteris, Leuconycteris, Xenoctenes, and Schizonycteris. The latter includes Micronycteris (Schizonycteris) minuta, Micronycteris (S.) schmidtorum, Micronycteris (S.) sanborni and Micronycteris (S.) yatesi. Little is known of the biology of M. (S.) sanborni, which is widely distributed in the dry forests of South America, but is known from only few sites. The scarcity of records of M. sanborni appears to be at least partly related to the difficulty of differentiating this species from the other members of the subgenus Schizonycteris. The present study identifies the key traits that distinguish this species from other Schizonycteris, reviews the geographic distribution of the species, and presents some... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Schizonycteris; Intraspecific variation; Dry forest; Brazil; Chiroptera.. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492015002000269 |
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| BORJA-OLIVEIRA,C. R.; SOARES,A. M.; ZAMUNÉR,S. R.; HYSLOP,S.; GIGLIO,J. R.; PRADO-FRANCESCHI,J.; RODRIGUES-SIMIONI,L.. |
| Snake venoms frequently vary in composition. In this work, we compared the neurotoxic and myotoxic activities of 16 lots of Bothrops neuwiedii venoms from different regions of Brazil, using chick biventer cervicis preparations. The neuromuscular blockade varied from 2% to 100% after 120 min incubation with venoms (50 mug/ml). In all cases, this blockade was irreversible and concentration-dependent; at low concentrations (10-20 mug/ml), 15 of the 16 venom lots failed to abolish responses to acetylcholine (110 muM), but blocked responses to KCl (13.4 muM), and induced contracture. At 5-20 mug/ml, the most active venom totally blocked twitch-tension without affecting responses to acetylcholine and KCl. Polyacrylamide gel electrophoresis for basic proteins... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bothrops neuwiedii venom; Intraspecific variation; Myotoxicity; Neurotoxicity; Neuromuscular blockade. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79302002000100008 |
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| Loskot, V.M.. |
| Individual, sex, age, seasonal and geographic variation of size and plumage coloration of Lesser Whitethroat Sylvia curruca (Linnaeus, 1758) was studied on more than 1100 bird skins from all parts of its breeding range. The results of analysis of birds from the south-eastern part of the breeding range of the species support the validity of five light-coloured subspecies: halimodendri Sushkin, 1904, telengitica Sushkin, 1925, snigirewskii Stachanow, 1929, minula Hume, 1873, and margelanica Stolzmann, 1897. Their diagnoses and ranges are refined and supplemented. Numerous phenotypically intermediate birds from intergradation zones between the subspecies show that these five together with the two northern darkcoloured forms S. c. curruca and S. c. blythi... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Sylvia; Lesser Whitethroat; Species-limits; Intergradation; Subspecies; Nomenclature; Systematics; Intraspecific variation; Size; Plumage coloration; Distribution.; 42.83. |
| Ano: 2005 |
URL: http://www.repository.naturalis.nl/record/210817 |
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| Dalosto,Marcelo M.; Palaoro,Alexandre V.; Oliveira,Davi de; Samuelsson,Évelin; Santos,Sandro. |
| Aeglids are freshwater anomurans that are endemic from southern South America. While their population biology at the species-level is relatively well understood, intraspecific variation within populations has been poorly investigated. Our goal was to investigate the population biology of Aegla platensis Schmitt, 1942 from the Uruguay River Basin, and compare our data with data from other populations. We estimated biometric data, sex ratio, population density and size-class frequencies, and frequencies of ovigerous females and juveniles, from the austral spring of 2007 until autumn 2008. Sexual dimorphism was present in adults, with males being larger than females. Furthermore, males and females were significantly larger than previously recorded for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aeglids; Ecological plasticity; Intraspecific variation; Population density; Sampling methods; Sex ratio. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000300002 |
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| Zanata,Angela M.; Camelier,Priscila; Carvalho,Fernando R.; Lima,Sergio M. Q.. |
| ABSTRACT Hyphessobrycon itaparicensis was originally described from a small stream in the Itaparica coastal island, Bahia State, Brazil, and has been sampled in several coastal rivers draining Bahia and Sergipe States. Broad examination of type material and recently collected specimens resulted in the redescription provided herein. The presence of one humeral blotch, absence of pseudotympanum, and conservation aspects of H. itaparicensis are briefly discussed. Data obtained from the original description, paratypes and topotypes of H. sergipanus showed broad overlap with H. itaparicensis and absence of morphological diagnostic features supporting the recognition of H. sergipanus as a valid species. Thus, H. sergipanus is considered as junior synonym of H.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coastal Brazilian rivers; Hyphessobrycon ellisae; Intraspecific variation; Northeastern Mata Atlântica ecoregion; Sexual dimorphism. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100220 |
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| Registros recuperados: 21 | |
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