Consulta: subjectFacets:"Intraspecific variation"
Registros recuperados: 21
Data/hora: 08/06/2024 11:38:05

Chromosome identification in the Andean common bean accession G19833 (Phaseolus vulgaris L., Fabaceae)
Provedor de dados: 74
Autores: Altrock,Sarah; Fonsêca,Artur; Pedrosa-Harand,Andrea.
Characterization of all chromosomes of the Andean G19833 bean genotype was carried out by fluorescent in situ hybridization. Eleven single-copy genomic sequences, one for each chromosome, two BACs containing subtelomeric and pericentromeric repeats and the 5S and 45S ribosomal DNA (rDNA) were used as probes. Comparison to the Mesoamerican accession BAT93 showed little divergence, except for additional 45S rDNA sites in four chromosome pairs. Altogether, the results indicated a relative karyotypic stability during the evolution of the Andean and Mesoamerican gene pools of P. vulgaris.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Common bean; Repetitive DNA; Chromosome marker; Cytogenetic map; Comparative map; Intraspecific variation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000300016

Autoregressive models for estimating phylogenetic and environmental effects: Accounting for within-species variations
Provedor de dados: 5
Autores: 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

Inter-individual variability in freshwater tolerance is related to transcript level differences in gill and posterior kidney of European sea bass
Provedor de dados: 5
Autores: L'Honoré, Thibault; Farcy, Emilie; Blondeau-bidet, Eva; Lorin-nebel, Catherine.
Acclimation to low salinities is a vital physiological challenge for euryhaline fish as the European sea bass Dicentrarchus labrax. This species undertakes seasonal migrations towards lagoons and estuaries where a wide range of salinity variations occur along the year. We have previously reported intraspecific differences in freshwater tolerance, with an average 30% mortality rate. In this study, we bring new evidence of mechanisms underlying freshwater tolerance in sea bass at gill and kidney levels. In fresh water (FW), intraspecific differences in mRNA expression levels of several ion transporters and prolactin receptors were measured. We showed that the branchial Cl-/HCO3- anion transporter (slc26a6c) was over-expressed in freshwater intolerant fish,...
Tipo: Text
Palavras-chave: Intraspecific variation; Osmoregulation; Freshwater acclimation; Ion transporters; SLC26A6; NKCC; PRLR.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00614/72569/71524.pdf

Remodeling of membrane lipids in gills of adult hard clam Mercenaria mercenaria during declining temperature
Provedor de dados: 5
Autores: Parent, G; Pernet, Fabrice; Tremblay, R; Sevigny, J; Ouellette, M.
In a previous study, a major remodeling of lipids, consistent with the theory of homeoviscous adaptation, was observed in the juvenile hard clam Mercenaria mercenaria during a temperature reduction from 24 to -1 degrees C. In addition, the lipid remodeling varied between genetically distinct lines of hard clams. The present study examined whether adult hard clams originating from different locations and a selectively bred variety show differences related to their genetic characteristics in the remodeling of lipids that normally occur during decreasing temperatures. Wild hard clams from 4 locations in Atlantic Canada and the selectively bred M mercenaria var. notata were held at an aquaculture growout site located at the northern distribution limit of the...
Tipo: Text
Palavras-chave: Sterol; Phospholipid; Membrane lipid; Intraspecific variation; Food; Fatty acid; Bivalve; Allozymes; Acclimatization.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4743.pdf

Flexibility in metabolic rate and activity level determines individual variation in overwinter performance
Provedor de dados: 5
Autores: Auer, Sonya K.; Salin, Karine; Anderson, Graeme J.; Metcalfe, Neil B.
Energy stores are essential for the overwinter survival of many temperate and polar animals, but individuals within a species often differ in how quickly they deplete their reserves. These disparities in overwinter performance may be explained by differences in their physiological and behavioral flexibility in response to food scarcity. However, little is known about whether individuals exhibit correlated or independent changes in these traits, and how these phenotypic changes collectively affect their winter energy use. We examined individual flexibility in both standard metabolic rate and activity level in response to food scarcity and their combined consequences for depletion of lipid stores among overwintering brown trout (Salmo trutta). Metabolism and...
Tipo: Text
Palavras-chave: Activity rate; Intraspecific variation; Lipid stores; Metabolic rate; Phenotypic flexibility.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00413/52498/53299.pdf

Intraspecific variation in the venom electrophoretic profile of recently captured Crotalus durissus terrificus (Laurenti, 1768) snakes
Provedor de dados: 79
Autores: MAGRO,A. J.; SILVA,R. J. DA; RAMOS,P. R. R.; CHERUBINI,A. L.; HATAYDE,M. R.
The aim of this study was to compare individual venom samples of Crotalus durissus terrificus recently captured in the wild to evaluate possible differences in venom protein composition. Protein levels were quantified by biochemical method (Biuret) and then submitted to electrophoresis. Electrophoresis studies of native protein were performed in vertical slabs of polyacrylamide gel (PAGE), in an alkaline discontinuous buffer system, with a concentration of 10% in the separation gel. SDS-PAGE was performed in PhastGel® (8-25). Both gels were stained with Coomassie Blue. Gels were analyzed using the VDS-Pharmacia® device. Our results indicate that all analyzed venom samples showed different protein composition, although common protein fractions were detected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crotalus durissus terrificus; Intraspecific variation; Protein composition; Venom; Sex; Feeding; Electrophoresis.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79302001000200010

INTRASPECIFIC VARIATION IN NEUROTOXIC AND MYOTOXIC ACTIVITIES OF Bothrops neuwiedii VENOMS
Provedor de dados: 79
Autores: 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

Morphological variation and taxonomic revision of five south-eastern subspecies of Lesser Whitethroat Sylvia curruca (L.) (Aves: Sylviidae)
Provedor de dados: 16
Autores: 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

TRY – a global database of plant traits
Provedor de dados: 16
Autores: Kattge, J.; Lens, F.
Plant traits – the morphological, anatomical, physiological, biochemical and phenological characteristics of plants and their organs – determine how primary producers respond to environmental factors, affect other trophic levels, influence ecosystem processes and services and provide a link from species richness to ecosystem functional diversity. Trait data thus represent the raw material for a wide range of research from evolutionary biology, community and functional ecology to biogeography. Here we present the global database initiative named TRY, which has united a wide range of the plant trait research community worldwide and gained an unprecedented buy-in of trait data: so far 93 trait databases have been contributed. The data repository currently...
Tipo: Article / Letter to the editor
Palavras-chave: Comparative ecology; Database; Environmental gradient; Functional diversity; Global analysis; Global change; Interspecific variation; Intraspecific variation; Plant attribute; Plant functional type; Plant trait; Vegetation model; 42.44.
Ano: 2011
URL: http://www.repository.naturalis.nl/record/423730

Diet-morphology relationship in the stream-dwelling characid Deuterodon stigmaturus (Gomes, 1947) (Characiformes: Characidae) is partially conditioned by ontogenetic development
Provedor de dados: 83
Autores: Dala-Corte,Renato Bolson; Silva,Eliane Regina da; Fialho,Clarice Bernhardt.
ABSTRACT We tested whether interindividual variations in diet composition within a population of Deuterodon stigmaturus can be explained by morphological differences between individuals, and whether diet-morphology relationships are dependent on the ontogenetic development. We analyzed diet of 75 specimens sampled in a coastal stream of Southern Brazil. Variation in stomach content was summarized with a Principal Coordinate Analysis (PCoA). The retained PCoA axes were tested as response to standard length (SL), and to values of intestine length (IL) and mouth length (ML) independent of body size, using linear mixed-effects models (LMM). The most consumed food items by D. stigmaturus were filamentous algae (41%), terrestrial plants (20.3%), detritus (12%),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characin; Coastal drainage; Feeding; Freshwater fish; Intraspecific variation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200209

Redescription of Hyphessobrycon itaparicensis, a senior synonym of H. sergipanus (Characiformes: Characidae)
Provedor de dados: 83
Autores: 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

HOW DO WE IDENTIFY MICRONYCTERIS (SCHIZONYCETRIS) SANBORNI SIMMONS, 1996 (CHIROPTERA, PHYLLOSTOMIDAE) RELIABLY AND WHERE WE CAN FIND THIS SPECIES IN BRAZIL?
Provedor de dados: 84
Autores: 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

Gender-related diet composition and morphometry of the Restinga Antwren, Formicivora littoralis (Aves: Thamnophilidae)
Provedor de dados: 103
Autores: Chaves,Flávia G.; Alves,Maria Alice S.
Formicivora littoralis (Gonzaga and Pacheco, 1990), the Restinga Antwren, considered the only endemic bird species of the Restinga ecosystem (sandy plain coastal vegetation), is threatened with extinction. The scientific literature provides little information on the biology of this bird, which was discovered in 1990. We evaluate gender-related differences in the composition of the diet and morphometric measurements of this species. We tested the hypothesis that the sexes differ in what they eat and in morphometric characters. Our results revealed that the diet of the Restinga Antwren includes mainly arthropods, which is consistent with the diets of other Thamnophilidae. The lack of differences in the composition of the diet between the sexes does not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arthropods; Food items; Intraspecific variation; Morphometry; Restinga ecosystem.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000600003

Paecilaema batman, a new species of Brazilian troglophilous harvestman that exhibits a remarkable color patches variation (Opiliones: Cosmetidae)
Provedor de dados: 103
Autores: Pinto-da-Rocha,Ricardo; Yamaguti,Humberto.
A new species of harvestman, Paecilaema batman, from Brazilian limestone caves of the state of Goiás, is described, and a remarkable intraspecific color patch variation is discussed. Paecilaema batman sp. nov. differs from other species of the genus by the following combination of features: chelicera similar in both sexes; prosoma without color patches; typical color patches on area I; and area III with two high spines. The new species is considered troglophilous.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Intraspecific variation; Neotropics; Opilionids; Polymorphism.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000400011

Population biology of Aegla platensis (Decapoda: Anomura: Aeglidae) in a tributary of the Uruguay River, state of Rio Grande do Sul, Brazil
Provedor de dados: 103
Autores: 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

Wing pattern variation in the Patagonian biting midge, Forcipomyia (Forcipomyia) multipicta Ingram &amp;amp; Macfe (Diptera, Ceratopogonidae)
Provedor de dados: 99
Autores: Spinelli,Gustavo R.; Marino,Pablo I.; Mauad,Melina.
Examination of the type-series and non-type specimens of the Patagonian biting midge, Forcipomyia (Forcipomyia) multipicta Ingram &amp;amp; Macfie (Diptera: Ceratopogonidae), revealed considerable variation in wing patterns of both sexes. One pattern includes several distinct light spot areas, whereas another pattern (e.g, in the holotype) only features marginal light spots in cell r3, while other light spots are barely perceptible or absent. The cause(s) of the differential lack of dark macrotrichia in certain areas of the wing membrane in specimens of some series could not be attributed either to their age, sex, or method of preservation.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Diptera; Ceratopogonidae; Biting midge; Forcipomyia multipicta; Intraspecific variation; Wing pattern; Patagonia.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0373-56802012000200016

GENETIC DIVERSITY OF Lutzomyia (Nyssomyia) intermedia IN AN ENDEMIC AREA OF AMERICAN CUTANEOUS LEISHMANIASIS, STATE OF PARANÁ, BRAZIL
Provedor de dados: 37
Autores: 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

Ecological significance of wood anatomy of Alseis pickelii Pilg. &amp;amp; Schmale (Rubiaceae) in a Tropical Dry Forest
Provedor de dados: 39
Autores: Campbell,Glaziele; Rabelo,Guilherme Rodrigues; Cunha,Maura Da.
This work describes, analyzes and compares the wood anatomy of Alseis pickelii from two distinct sites in Tropical Dry Forest. One site is an exploited forest that was disturbed by deforestation whereas the other site is preserved and has not been logged since selective logging in the 1960's. For the evaluation of wood anatomy, plant material was processed following standard techniques for light microscopy and histochemical tests. The results indicated that A. pickelii did not vary qualitatively between the two sites. The histochemical tests indicated the presence of prismatic crystals and starch in radial parenchyma of samples from both sites. Some quantitative parameters differed significantly between the two sites including: vessel frequency; vessel...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acclimation; Atlantic Forest; Intraspecific variation; Rubiaceae; Wood anatomy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100124

Variation in root morphology of epiphytic orchids along small-scale and large-scale moisture gradients
Provedor de dados: 39
Autores: Einzmann,Helena J. R.; Schickenberg,Nina; Zotz,Gerhard.
ABSTRACT Root morphology is expected to respond to environmental conditions. Two earlier studies reported predictable changes in the structure of the velamen radicum (common in monocotyledons) along rainfall gradients, which was expected from its assumed role in plant-water-relations. The present study expanded on this idea by analysing nine root traits that can be linked to root function, including velamen structure, along two moisture gradients of different spatial scales: 1) along the vertical gradient of a lowland forest in central Panama and 2) along a strong regional rainfall gradient in western Panama. All studied traits (e.g. velamen width, number of xylem poles, lignification of the exodermis) of the 45 orchid species showed substantial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epiphytic orchids; Exodermis; Interspecific variation; Intraspecific variation; Lignification; Plant morphology; Velamen radicum; Water relations.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100066

A dinosaur ilium from the Late Triassic of Brazil with comments on key-character supporting Saturnaliinae
Provedor de dados: 42
Autores: GARCIA,MAURÍCIO S.; PRETTO,FLÁVIO A.; DIAS-DA-SILVA,SÉRGIO; MÜLLER,RODRIGO T.
Abstract: Discoveries in Carnian-aged rocks are establishing a rich and diverse dinosaurian fauna at the so-called ‘dawn of the age of dinosaurs’ in the Late Triassic of Western Gondwana. Accordingly, Brazilian strata from the Candelária Sequence have contributed extensively to this trend. Here, we present a new dinosaurian specimen (CAPPA/UFSM 0200) from this geological unit. The material was collected at a fossiliferous site that had no previous record of dinosaurs. Our specimen comprises a single ilium, which we describe in detail. Its anatomy is consistent with Carnian sauropodomorph dinosaurs, but differs from coeval specimens by several features, although we do not discard the possibility of these features being the result of intraspecific variation....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Intraspecific variation; Saurischia; Sauropodomorpha; Upper Triassic; Western Gondwana.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400516

Populational approach in ecophysiological studies: the case of Plathymenia reticulata, a tree from Cerrado and Atlantic Forest
Provedor de dados: 61
Autores: Lemos Filho,José Pires de; Goulart,Maíra Figueiredo; Lovato,Maria Bernadete.
The variability of ecophysiological traits among populations can be a result of selection in response to environmental pressure and/or due to random factors, like the genetic drift. The analysis of both genetic and phenotypic variation within populations can lead to better understanding of adaptation in order to colonize different habitats. In the last years we have developed several studies with an widely ecogeographic distributed legume tree species, Plathymenia reticulata, which were focused on identifying specific morphological and physiological traits related to adaptation to the habitats of origin of each studied population. We studied populations from Atlantic Forest, Cerrado and ecotonal sites in relation to phenology, seed morphological traits and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecotypes; Evolutionary ecophysiology; Intraspecific variation; Local adaptation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000300005