Consulta: subjectFacets:"Morphological variation"
Registros recuperados: 22
Data/hora: 16/06/2024 10:59:53

Variación ecológica, morfológica y química: atributos clave para el aprovechamiento y conservación de Jatropha sp.
Provedor de dados: 32
Autores: Hernández Nicolás, Nancy Yazmin.
En México se consignan 45 especies para el género Jatropha (Euphorbiaceae). La Reserva de las Biosfera de Tehuacán-Cuicatlán concentra riqueza genética y endemismo para este género, que proporciona alimento, medicina y energía a los habitantes, pero falta información sobre la distribución, ecología y aprovechamiento de las especies. Esta tesis se organizó en tres capítulos. En el primero se precisaron taxonómicamente las especies de Jatropha, se diferenciaron las Unidades Ambientales (UA) en las que habitan, se valoró el estado de conservación de sus hábitats y se calificó la vulnerabilidad de sus poblaciones; en el segundo capítulo, se verificó la variación morfológica intra e interespecífica; y,  en el último, se caracterizó el aprovechamiento...
Palavras-chave: Ecología; Usos; Conservación; Variación morfológica; Ecology; Uses; Conservation; Morphological variation; Genética; Maestría; Jatropha especies; Jatropha species.
Ano: 2014
URL: http://hdl.handle.net/10521/2290

LARVAL MORPHOLOGICAL VARIATION AND ITS RELATION TO HOST PLANTS IN SYNCIRSODES PRIMATA (LEPIDOPTERA: GEOMETRIDAE)
Provedor de dados: 72
Autores: Bocaz,Patricia; Parra,Luis E.; Victoriano,Pedro F.
Morphological variations in larvae of Syncirsodes primata (Walker 1862) from different hosts were studied. Three different morphs, varying in the number of dorsal tubercles and color, were detected. It appears that these variations depend upon the species of host plant on which the larvae inhabit. The results suggest that the selection of host plants may determine the color, indicating phenotypic plasticity. However, constancy in tubercle number, independent of a change of host plant, suggests genetic differences among morphs
Tipo: Journal article
Palavras-chave: Morphological variation; Phenotypic plasticity; Syncirsodes primata; Geometridae; Lepidoptera.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100006

Macrozooplankton diversity: how much do we really know?
Provedor de dados: 16
Autores: Pierrot-Bults, A.C.; Spoel, S. van der.
Pelagic species are widely distributed in a horizontal plane and have three-dimensional distributions, since the sea covers about 70% of the surface of the earth, and on average 4 km deep. For most macrozooplankton and micronekton groups there seems to be no great expectations of finding new taxa with the exception of gelatinous groups and of the deep sea, which is a relatively unknown especially in the benthopelagic zone close to the sea-bed. However, we do not know very much about variation, either morphological or genetical, within socalled species in different parts of their range. We think we are dealing with single very broadly distributed species, which, in reality, are species complexes consisting of several more or less cryptic species or...
Tipo: Article / Letter to the editor
Palavras-chave: Pelagic macrozooplankton/micronekton diversity; Biogeographic patterns; Genetic variation; Morphological variation; Cryptic species; 42.79.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/220316

Nonrandom variation in Poecilia marcellinoi n. sp. and P. salvatoris Regan, 1907 in El Salvador (Pisces, Poeciliidae)
Provedor de dados: 16
Autores: Poeser, Frederick N.
A new species of the genus Poecilia Bloch &amp; Schneider, 1801 is recorded from El Salvador. Morphological and meristic data of P. marcellinoi n. sp. and of the sympatric P. salvatoris Regan, 1907 are analysed. Intra- and interspecific variation are compared and correlated with environmental and interspecific influences. A high degree of character displacement is observed in populations from stable freshwater habitats. In habitats with presumed marine influences, this character displacement is counteracted by ecological stress. Based on the evidence presented, subspecific separation of observed ecotypes from literature is rejected.
Tipo: Article / Letter to the editor
Palavras-chave: Poecilia; Taxonomy; New species; Morphological variation; Character displacement; El Salvador.
Ano: 1995
URL: http://www.repository.naturalis.nl/record/504455

Quantitative morphological variation in Sagitta setosa Müller, 1847 (Chaetognatha) and two closely related taxa
Provedor de dados: 16
Autores: Peijnenburg, Katja T.C.A.; Pierrot-Bults, Annelies C.
This paper reviews the quantitative morphological variation published for Sagitta setosa Müller, 1847 and two other species described within the S. serosa-complex, viz., S. euxina Moltschanoff, 1909 from the Black Sea, and S. batava Biersteker &amp; Van der Spoel, 1966 from the Scheldt Estuary (Netherlands). Data on total (body) length, caudal length, numbers of teeth and hooks, ovary length, and dimensions of fins are compared between these three taxa. Additionally, samples from the North Sea, Mediterranean, and Black Sea are compared to look for geographic differences. Specimens from the Mediterranean were smallest with relatively long caudal segments, and few teeth and hooks, whereas specimens from the Black Sea were largest with relatively short caudal...
Tipo: Article / Letter to the editor
Palavras-chave: Sagitta setosa; Chaetognatha; Morphological variation; European seas.
Ano: 2004
URL: http://www.repository.naturalis.nl/record/534323

Pollen morphological variation in Vanguerieae (Ixoroideae - Rubiaceae)
Provedor de dados: 16
Autores: Lens, F.; Jansen, S.; Huysmans, S.; Robbrecht, E.; Smets, E.
The Vanguerieae is a large tribe of the subfamily Ixoroideae (Rubiaceae) and consists of about 500 species in 27 genera. This study gives a detailed pollen morphological description of 30 species from 16 genera, based on light microscopy and scanning electron microscopy. The Vanguerieae are considered to be stenopalynous, although there is some evidence to question this. First, there is a difference in sexine types that clearly de® nes Keetia and Psydrax ( both reticulate) , and Canthium and Vanguerieae (both perforate with very small perforations) from the other Vanguerieae investigated. Second, pollen grains corroborate the subgeneric delimitations of Canthium sensu Bridson. Pollen morphologically the tribe is characterised by ( 1) the shape of the...
Tipo: Article / Letter to the editor
Palavras-chave: Vanguereae; Ixoroideae; Rubiaceae; Pollen; Morphological variation; Stenopalynous; 42.58.
Ano: 2000
URL: http://www.repository.naturalis.nl/record/423771

Revision of the genus Parapagurus (Anomura: Paguroidea: Parapaguridae), including redescriptions of the western Atlantic species
Provedor de dados: 16
Autores: Lemaitre, R.
As a result of a revision of the genus Parapagurus Smith, three genera are proposed: Parapagurus sensu stricto, Strobopagurus gen. nov., and Sympagurus Smith reinstated. Diagnoses of the three genera are given, and a number of structures are described. A key to aid in the identification of the genera of the family is presented. All taxa heretofore assigned to Parapagurus are reassigned. Four species of Parapagurus and six of Sympagurus occur in the western Atlantic, including a new species, Sympagurus acinops. All western Atlantic species are redescribed. Parapagurus abyssorum (Filhol) is a senior homonym of the eastern Pacific Parapagurus abyssorum Henderson, and a new name, Parapagurus holthuisi, is given to Henderson's taxon. The subspecies of...
Tipo: Article / Letter to the editor
Palavras-chave: Deep-water hermit crabs; Parapagurus; Strobopagurus; Sympagurus; Systematic revision; New genus; New species; Morphological variation; Symbiotic associations.; 42.74.
Ano: 1989
URL: http://www.repository.naturalis.nl/record/317875

Variations in the gonostyle of Nyssomyia intermedia (Lutz &amp;amp; Neiva) (Diptera: Psychodidae)
Provedor de dados: 82
Autores: Pinto,Israel S; Santos,Claudiney B; Ferreira,Adelson L; Falqueto,Aloísio.
This paper describes sand flies similar to Nyssomyia intermedia (Lutz &amp;amp; Neiva) with variations in the number of spines at the gonostyle and tests the hypothesis whether these specimens belong or not to N. intermedia species. Using Principal Component Analysis and Neighbour Joining, the measurements of 15 structures of the phlebotomine with variations in number of spines were compared with measurements of 30 sand flies of N. intermedia species. Both analyses didn't cluster the specimens with variation in spines number in one group and provided evidence to the hypothesis that those sand flies belong to N. intermedia.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anomaly; Morphological variation; Sand fly; Taxonomy.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000500010

Geographic variation of Moenkhausia bonita (Characiformes: Characidae) in the rio de la Plata basin, with distributional comments on M. intermedia
Provedor de dados: 83
Autores: Vanegas-Ríos,James Anyelo; Britzke,Ricardo; Mirande,Juan Marcos.
ABSTRACT Moenkhausia bonita occurs in numerous additional localities from the Bermejo, Paraná, Paraguay, and Uruguay river basins. Given that this finding greatly expands the distributional range of M. bonita, we carried out an intraspecific comparison, using multivariate methods for 18 morphometric and eight meristic characters taken from a comprehensive sample of 536 specimens. All localities were distributed in four major geographic groups as follows: Bermejo, Paraná, Paraguay, and Uruguay. Results of the morphometric comparisons showed significant differences among the studied groups except between the Paraguay and Uruguay groups. Statistical differences in meristic values were found for most between-group comparisons, especially in those resulting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Argentina; Moenkhausia; Morphological variation; Widespread species.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000100202

TAXONOMIC REVISION OF THE TIGRINA LEOPARDUS TIGRINUS (SCHREBER, 1775) SPECIES GROUP (CARNIVORA, FELIDAE)
Provedor de dados: 84
Autores: NASCIMENTO,FABIO OLIVEIRA DO; FEIJÓ,ANDERSON.
ABSTRACT The tigrina Leopardus tigrinus (Schreber, 1775) is a small-sized Neotropical spotted cat found from northern Argentina and southern Brazil to Costa Rica. Four subspecies are traditionally recognized: L. t. tigrinus (Schreber, 1775) from northern Brazil, the Guianas and eastern Venezuela; L. t. pardinoides (Gray, 1867) from western Venezuela, Colombia, Ecuador and Peru; L. t. guttulus (Hensel, 1872) from southern Brazil, Paraguay and northern Argentina; and L. t. oncillus (Thomas, 1903) from Costa Rica. We studied external and craniodental morphology in quantitative and qualitative terms from 250 specimens in order to clarify the taxonomic status of tigrina. Based on the characters analyzed in this study, we recognize three diagnosable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leopardus tigrinus; L. guttulus; L. emiliae; Subspecies; Morphological variation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492017001900231

A revision of Dichotomius (Homocanthonides) Luederwaldt, 1929 (Coleoptera: Scarabaeidae: Scarabaeinae)
Provedor de dados: 92
Autores: Maldaner,Maria E.; Valois,Marcely C.; Vaz-de-Mello,Fernando Z.
ABSTRACT The monospecific subgenus Dichotomius (Homocanthonides) is revised and its single species, Dichotomius (H.) smaragdinus (Perty, 1830) is redescribed and distinguished from other Dichotomius species. Dichotomius (H.) smaragdinus is a polymorphic species and its distribution comprises the Brazilian Cerrado. For the first time, morphological variation and male genital organ are described and illustrated. We believe that this species might be endangered due to extensive deforestation of Brazilian Cerrado by agricultural and pasture expansion. Thus, we highlight the importance of preserving this very unusual Dichotomius species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian Cerrado; Dung beetles; Morphological variation; Taxonomy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262018000300237

Geographic variation in hairy dwarf porcupines of Coendou from eastern Brazil (Mammalia: Erethizontidae)
Provedor de dados: 103
Autores: Caldara Junior,Vilacio; Leite,Yuri L. R.
We evaluated geographic variation in New World porcupines of Coendou (Erethizontidae) from eastern Brazil by analyzing morphological data from museum specimens we identified as Coendou insidiosus and C. spinosus. Coendou insidiosus ranges from the states of Bahia to Espírito Santo, reaching the state of Minas Gerais in Brazil; C. spinosus extends from the states of Minas Gerais and Espírito Santo to the state of Rio Grande do Sul, in Brazil, extending into Paraguay, Uruguay, and northeastern Argentina. Our results indicate that there are three spatially coherent, morphologically distinct groups, which can be diagnosed using a combination of discrete morphological characters, and which are supported by univariate and multivariate statistical analyses. We...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Rainforest; Biogeography; Morphological variation; Sphiggurus; Taxonomy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000400005

The Aconcagua River as another barrier to Liolaemus monticola (Sauria: Iguanidae) chromosomal races of central Chile
Provedor de dados: 97
Autores: LAMBOROT,MADELEINE; EATON,LAFAYETTE; CARRASCO,BASILIO A.
ABSTRACT Univariate and multivariate statistical analyses of 28 meristic characters recorded for 19 samples of the lizard Liolaemus monticola monticola were used to compare geographical variation in morphology with chromosomal races north and south of the Maipo River, and north and south of the Aconcagua River in central Chile, plus some affluent. This extends a previous morphological study that confirmed that the Maipo River is a biogeographical barrier that separates chromosomal races "Southern, 2n=34" and "Northern, 2n=38-40", and reports for the first time the importance of the Aconcagua River as another biogeographical barrier between the chromosomal races "Northern, 2n=38-40" and the "Multiple Fission, 2n=42-44". The phenetic variation among samples...
Tipo: Journal article
Palavras-chave: Chromosomal races; Morphological variation; Geographic barrier; Aconcagua River.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000100003

Diferenciação morfométrica e osteológica entre Ramnogaster arcuata (Jenyns) e Platanichthys platana (Regan) (Teleostei, Clupeidae)
Provedor de dados: 104
Autores: Campello,Fernando Dantas; Bemvenuti,Marlise de Azevedo.
Ramnogaster arcuata (Jenyns, 1842) and Platanichthys platana (Regan, 1917), found at the estuary of Lagoa dos Patos and coastal lagoon (Lagoa Mirim) at the South of Brazil, are two sympatric clupeid fishes with very similar features. In order to clarify their taxonomic and geographical situation, delimiting its occurrence in fresh waters, a comparative study of the bony structures of the head, anal and dorsal fins and ventral scutes of these two sardines was developed. The osteological study with clear and stain technique included more information about the differentiation of the groups from the bones of the supramaxilla, dentary, pterygiophore and epipleural ribs. Variations on the body shape of those species were analyzed through the multivariate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clupeidae; Multivariate morphometry; Morphological variation; Osteology.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000300013

Sexual dimorphism in the electric knifefish, Gymnorhamphichthys rondoni (Rhamphichthyidae: Gymnotiformes)
Provedor de dados: 36
Autores: GARCIA,Elisa Queiroz; ZUANON,Jansen.
ABSTRACT Sexual dimorfism refers to morphological differences between males and females of a species. It may be a result of different selection pressures acting on either or both sexes and may occur in any sexually-reproducing dioecious species, including fishes. We analyzed 63 females and 63 adult males of Gymnorhamphichthys rondoni (Gymnotiformes) collected by us or deposited in museum collections. Sex was identified through abdominal dissection. We measured length from snout to posterior end of anal-fin, anal-fin length, distance from anus to anal-fin origin, distance from genital papilla to anal-fin origin, body width at beginning of anal-fin, and head length. Morphometric data submitted to a Principal Component Analysis (PCA) grouped males and females...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electric fish; Head morphology; Morphological variation; Sexual differences; Urogenital papilla.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672019000300213

Effect of rosette size, clonality and spatial distribution on the reproduction of  Vriesea carinata (Bromeliaceae) in the Atlantic Forest of Paraná, southern Brazil
Provedor de dados: 39
Autores: Silva,Marcelo Aparecido de Souza; Varassin,Isabela Galarda.
ABSTRACT Plant size and clonality are important traits for explaining the reproductive effort of clonal plants. Larger plants can invest more resources into reproduction, and clonality is known to increase reproductive effort. Moreover, reproductive effort is influenced by environmental variation, and so the spatial distribution of plants may affect plant reproductive effort. We investigated the effect of plant size, clonality and spatial distribution on the reproductive effort of Vriesea carinata in the Atlantic Forest in the state of Paraná, Brazil. We marked twenty individual plants and measured their rosette size, biomass and number, as well as rosette reproductive effort (number of flowers, fruits and seeds). We also evaluated the relationship between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clonal growth; Morphological variation; Reproductive effort; RNSM; Vriesea.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000300401

Effect of indigo dye effluent on the growth, biomass production and phenotypic plasticity of Scenedesmus quadricauda(Chlorococcales)
Provedor de dados: 42
Autores: CHIA,MATHIAS A.; MUSA,RILWAN I.
The effect of indigo dye effluent on the freshwater microalgaScenedesmus quadricauda ABU12 was investigated under controlled laboratory conditions. The microalga was exposed to different concentrations of the effluent obtained by diluting the dye effluent from 100 to 175 times in bold basal medium (BBM). The growth rate of the microalga decreased as indigo dye effluent concentration increased (p &lt;0.05). The EC50 was found to be 166 dilution factor of the effluent. Chlorophyll a, cell density and dry weight production as biomarkers were negatively affected by high indigo dye effluent concentration, their levels were higher at low effluent concentrations (p &lt;0.05). Changes in coenobia size significantly correlated with the dye effluent concentration. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater; Microalgae; Morphological variation; Pollution; Textile waste.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100419

Description of a second known Liotyphlops caissara specimen (Serpentes: Anomalepididae)
Provedor de dados: 42
Autores: ABEGG,ARTHUR D.; AZEVEDO,WEVERTON S.; FRANCO,FRANCISCO L.; DUARTE,MARCELO R.
Abstract: We recorded a second specimen of the poorly known insular blind snake Liotyphlops caissara. This new specimen expands the morphological variation of the number of dorsal scales in the genus Liotyphlops to 296 (vs. 304 in L. wilderi) and, considering the fact that the holotype of this species was destroyed, the present specimen represents the only available L. caissara individual in zoological collections. Also, this new record constitutes the first out of type locality and expands the distribution of the species in about 40 km to the northeastern. According to IUCN criteria (B1a, b [iii]), we suggest that L. caissara be included in the “Endangered” category, since it occurs in only two insular locations and exhibits an occurrence extension of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic rainforest; Geographic distribution; Morphological variation; Southeastern Brazil.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500611

Characterization and taxonomic key for tadpoles (Amphibia: Anura) from the northwestern region of São Paulo State, Brazil
Provedor de dados: 49
Autores: Rossa-Feres,Denise de Cerqueira; Nomura,Fausto.
Difficulties in species identification and the absence of taxonomic keys are several of the obstacles in elaborating adequate conservation, management and habitat recovery programs. This study provides a taxonomic key, morphological characterization, and drawings for the 22 known anuran tadpoles from the northwestern region of São Paulo state, southeastern Brazil. Specimens of all species analyzed are deposited in the scientific amphibian collection of Universidade Estadual Paulista (DZSJRP), São José do Rio Preto, SP.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Neotropical region; Biodiversity; Morphological variation; Taxonomy.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032006000100014

Skeletal variability of the coral Favia gravida (Verrill, 1868) from Brazil
Provedor de dados: 49
Autores: Amaral,Fernanda Duarte; Ramos,Carla Alecrim Colaço.
The skeletal variability of the coral Favia gravida, a species endemic to Brazil, was quantitatively described including populations from three locations: Tamandaré (state of Pernambuco), Abrolhos (state of Bahia), and Santa Cruz (state of Espírito Santo). Ten colonies were collected from each population and fourteen morphological characters were measured from ten corallites per colony. The results of univariate (among 14 skeletal characters, 7 showed p &lt; 0.05) analysis provide evidence to suggest that F. gravida has considerable morphological plasticity, which may explain its ability to adapt to different ecological conditions. The species also displays polymorphism within and between colonies of each population. Intercolony variation within...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphological variation; Skeletal characters; Favia.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032007000300027

Intracolonial variation in Siderastrea de Blainville, 1830 (Anthozoa, Scleractinia): taxonomy under challenging morphological constraints
Provedor de dados: 49
Autores: Menezes,Natália Matos de; Neves,Elizabeth Gerardo; Barros,Francisco; Kikuchi,Ruy Kenji Papa de; Johnsson,Rodrigo.
The morphology of sessile invertebrates, such as scleractinian corals, can be controlled by environmental and genetic mechanisms and, consequently, it is highly variable. Morphological variation has puzzled taxonomists by posing challenges to species classification within cryptic species complexes. The 'Atlantic Siderastrea Complex' is a suitable example. Because of overlapping diagnostic traits, the morphological interspecific limits of this group remain controversial and often resulted in doubtful synonyms. In addition, the recent identification of the Caribbean S. radians in the Southwestern Atlantic has revealed that intraspecific variation has been equivocally assessed. Traditionally, hierarchical categories of variation have been the criteria used to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Systematics; Siderastrea radians; Morphological variation; Biogeographic expansion; South Atlantic.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000100012

Genetic variability in clones of 'Prata Anã' bananas based on phenotypic and molecular markers
Provedor de dados: 53
Autores: Rodrigues,Francisco Ermelindo; Librelon,Samira Santiago; Nietsche,Silvia; Costa,Márcia Regina; Pereira,Marlon Cristian Toledo.
The objective of this study was to examine the molecular and phenotypic variability of 'Prata Anã' banana clones cultivated in northern Minas Gerais State. For the phenotypic and molecular characterization, the clones were collected from five properties. The morphological characterization of 20 clones was accomplished through a qualitative evaluation of 74 descriptors. For the molecular evaluations, 45 clones were collected, and 14 Random Amplified Polymorphic DNA primers were used. Among the 74 morphological descriptors evaluated in the 20 'Prata Anã' banana tree clones, 53 descriptors presented in the same homogeneous class for all clones. The presence of anthocyanin in the pseudostem (ANT) and the shape (BUS) and flexion (FLX) of the bunch clearly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa spp.; Morphological variation; Diversity; Clonal population; RAPD.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000200005