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Registros recuperados: 41
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A comparative ultrastructural study of pit membranes with plasmodesmata associated thickenings in four angiosperm species Naturalis
Rabaey, D.; Lens, F.; Huysmans, S.; Smets, E.; Jansen, S..
Recent micromorphological observations of angiosperm pit membranes have extended the number and range of taxa with pseudo-tori in tracheary elements. This study investigates at ultrastructural level (TEM) the development of pseudo-tori in the unrelated Malus yunnanensis, Ligustrum vulgare, Pittosporum tenuifolium, and Vaccinium myrtillus in order to determine whether these plasmodesmata associated thickenings have a similar developmental pattern across flowering plants. At early ontogenetic stages, the formation of a primary thickening was observed, resulting from swelling of the pit membrane in fibre-tracheids and vesselelements. Since plasmodesmata appear to be frequently, but not always, associated with these primary pit membrane thickenings, it remains...
Tipo: Article / Letter to the editor Palavras-chave: Ontogeny; Pseudo-torus; Tracheary element; Pit membrane; Bordered pit; Wood ultrastructure; 42.56.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/430078
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A reevaluation of the evidence supporting an unorthodox hypothesis on the origin of extant amphibians Naturalis
Marjanovic, D.; Laurin, M..
The origin of frogs, salamanders and caecilians is controversial. McGowan published an original hypothesis on lissamphibian origins in 2002 (McGowan, 2002, Zoological Journal of the Linnean Society, 135: 1-32), stating that Gymnophiona was nested inside the 'microsaurian' lepospondyls, this clade was the sister-group of a caudate-salientian-albanerpetontid clade, and both were nested inside the dissorophoid temnospondyls. We have investigated McGowan's data matrix and isagree with the scoring of 35% of the cells. All taxa and all but two characters are affected. In some cases, we have a different interpretation about correspondence between morphology and character states, or we delimit states differently (or use information that was unknown in 2002). In...
Tipo: Article / Letter to the editor Palavras-chave: Albanerpetontidae; Brachydectes; Coding; Continuous characters; Data matrix; Gerobatrachus; Gymnophioniformes; Gymnophionomorpha; Lissamphibia; Lysorophia; Morphology; Ontogeny; Paleontology; Phylogeny; Scoring; Stepmatrix gap-weighting; 42.82.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/289109
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A standardized description of European Sminthuridae (Collembola, Symphypleona), 3: description of seven species of Sminthurus, including four new to science Naturalis
Nayrolles, Pierre.
The following three species are redescribed: Sminthurus viridis (Linnaeus, 1758), Sminthurus nigromaculatus Tullberg, 1871, and Sminthurus multipunctatus Schäffer, 1896. Four new species are described from France and Spain: Sminthurus bourgeoisi n. sp., Sminthurus bozoulensis n. sp., Sminthurus leucomelanus n.sp.,and Sminthurus hispanicus n. sp. The importance of the ontogeny of chaetotaxy is stressed. Indeed, not all species acquire the secondary chaetotaxy in the same instar, and for these characters the most informative instar is not the adult but the third juvenile instar. The study of such characters involves the clustering of similar characters. A short discussion is given about this issue (selection of characters and clustering criteria).
Tipo: Article / Letter to the editor Palavras-chave: Collembola; Symphypleona; Sminthurus; Chaetotaxy; New species; Taxonomy; Ontogeny; France; Spain.
Ano: 1995 URL: http://www.repository.naturalis.nl/record/503948
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Age and Sex-Related Geometrical Variation of Ramus mandibulae of Sus scrofa's (Mammalia: Artiodactyla) Jaws International Journal of Morphology
Hohl,Leandro dos S. L; Sicuro,Fernando L; Azorit,Concepción; Carrasco,Rafael; Rocha-Barbosa,Oscar.
Morphological variation of the ramus mandibulae of wild Sus scrofa was described and correlated to sex and age differences. Young forms (n=27, 15 males, 12 females) and adults (n=23, 13 males, 10 females) were analyzed through Geometric Morphometrics (2-D) to assess differences between groups. We found significant differences between age- and sex-related shape variations at ramus mandibulae level. Young wild boars present bulky angular process with backward oriented coronoid process, while adults show slender jaw vertical ramus, and orthogonally oriented coronoid process. The ramus mandibulae in female wild boars is more robust and bulky than in males. The morphological changes between young and adult forms are related to alterations in the osteo-muscular...
Tipo: Journal article Palavras-chave: Mandible; Ontogeny; Sexual Dimorphism; Wild boar.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400026
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Analysis of a species/instars/characters table: a theoretical survey on the use of chaetotaxy in ontophylogenetic studies Naturalis
Nayrolles, Pierre.
Phylogenetic studies on several groups of arthropods, such as Acari (mites) or Collembola (springtails), make wide use of chaetotaxy. Chaetotaxic characters, besides being morphological features (setal shape), often have a binary nature, that is presence vs. absence. A seta can be variable in a population, and one may attribute a presence probability to this seta. In fact, the presence probability should be defined for each instar. One might think that a variable seta corresponds to a polymorphism (e.g., two or more alleles in a population); in fact, setal variability should be regarded as the result of a propensity intrinsic to individuals, i.e., a potentiality being expressed at random among specimens. The phenomenon known as lateral inhibition explains...
Tipo: Article / Letter to the editor Palavras-chave: Ontogeny; Phytogeny; Chaetotaxy; Probabilistic organs; Ontogenetic trajectories; Arthropods; Collembola; Symphypleona.
Ano: 1998 URL: http://www.repository.naturalis.nl/record/534360
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Beschreibung der sechs Nauplius-Stadien von Parastenocaris phyllura Kiefer, 1938 im Vergleich mit P. vicesima Klie, 1935 (Copepoda, Harpacticoida) Naturalis
Glatzel, Thomas.
Six non-overlapping size classes and morphologically distinct nauplius stages of Parastenocaris phyllura are studied using light microscopy. The nauplii have been reared in laboratory cultures. A comparative analysis of the morphology of the nauplius stages of P. phyllura and P. vicesima (cf. Schminke, 1982) is presented.
Tipo: Article / Letter to the editor Palavras-chave: Copepoda; Parastenocaris phyllura; Groundwater; Nauplius stages; Ontogeny.
Ano: 1992 URL: http://www.repository.naturalis.nl/record/504514
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Body condition influences ontogeny of foraging behavior in juvenile southern elephant seals ArchiMer
Orgeret, Florian; Cox, Samantha; Weimerskirch, Henri; Guinet, Christophe.
Ontogeny of diving and foraging behavior in marine top predators is poorly understood despite its importance in population recruitment. This lack of knowledge is partly due to the difficulties of monitoring juveniles in the wild, which is linked to high mortality early in life. Pinnipeds are good models for studying the development of foraging behaviors because juveniles are large enough to robustly carry tracking devices for many months. Moreover, parental assistance is absent after a juvenile departs for its first foraging trip, minimizing confounding effects of parental input on the development of foraging skills. In this study, we tracked 20 newly weaned juvenile southern elephant seals from Kerguelen Islands for up to 338 days during their first trip...
Tipo: Text Palavras-chave: Accelerometers; Diving behavior; Early-life; First-year juveniles; Foraging behavior; Ontogeny; Satellite relay tags; Southern elephant seals.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00482/59380/62484.pdf
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Corallimorpharia collected during the CANCAP expeditions (1976-1986) in the south-eastern part of the North Atlantic* Naturalis
Hartog, J.C. den; Ocaña, O.; Brito, A..
Species of Corallimorpharia collected during the CANCAP expeditions in the south-eastern part of the North Atlantic are described and discussed, altogether five species belonging to three genera of Corallimorphidae: the shallow water forms Corynactis viridis Allman, 1846, Pseudocorynactis caribbeorum den Hartog, 1980, and P. caboverdensis spec. nov., and the deep-sea forms Corallimorphus cf. atlanticus Carlgren, 1934, and C. ingens Gravier, 1918. The taxonomic status of the representatives of the genus Corynactis Allman, 1846, is discussed. All temperate to subtropical species described so far belong to a group of closely related allopatric taxa forming the Corynactis viridis-complex, possibly representing a single species only. The colours of Corynactis...
Tipo: Article / Letter to the editor Palavras-chave: Corallimorpharia; Corallimorphidae; Corallimorphus; Corynactis; Pseudocorynactis; Sideractis; Nectactis; Nematocysts; Ontogeny; Distribution; Feeding; CANCAP-project; South-eastern North Atlantic; Macaronesia.; 42.72.
Ano: 1993 URL: http://www.repository.naturalis.nl/record/317646
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Desarrollo larval de merluza (Merluccius hubbsi) considerando aspectos ecomorfologicos OceanDocs
Betti, P..
The ontogeny of the first stages of development of hake (Merluccius hubbsi)considering yolksac larvae, preflexion larvae, larvae in flexion, postflexion larvae, transformation larvae and posttransition juveniles, is described. Fish larvae and posttransition juveniles were collected in the north Patagonian area, between 42° and 46°S, from surroundings of the coast to the 100 m isobath (Argentine Sea, SW Atlantic). The larvae were collected between December and February, and the posttransition juveniles, in April and June since 1989 to 2004. The morphometrics variables and pigmentation were recorded in 127 larvae y 41 posttransition juveniles ranging in total length (TL)from 2.0 to 35.0 mm. Additionally, the openning of the mouth was calculated and...
Tipo: Theses and Dissertations Palavras-chave: Fish larvae; Juveniles; Ontogeny; Morphogenesis; Morphogenesis; Fish larvae; Juveniles; Ontogeny; Http://aims.fao.org/aos/agrovoc/c_4943; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_25393; Http://aims.fao.org/aos/agrovoc/c_12941.
Ano: 2005 URL: http://hdl.handle.net/1834/2599
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Description of Atherinella brasiliensis (Quoy & Gaimard, 1825) (Atheriniformes: Atherinopsidae) larvae from the Jaguaribe River estuary, Itamaracá island, Northeastern Brazil Neotropical Ichthyology
França,Elton J.; Severi,William; Castro,Maviael F.; Medeiros,Tatiane N.; El-Deir,Ana Carla A..
The present study describes the external morphology and morphometry of the initial development of Atherinella brasiliensis, and contributes toward broadening knowledge on its biology. A total of 88 larvae and 14 juveniles were used to characterize the morphological development and analyze body proportions. Fish with standard lengths (SL) from 1.4 to 77 mm were used in the study. Larvae hatch at an average of 1.4 mm SL. In the preflexion stage, the larval body is enveloped by a finfold, which begins behind the head. Pectoral fins are the first to be formed and preflexion larvae have four characteristic dendritic chromatophores on the head. The flexion stage begins at an average of 4.4 mm SL; dorsal and anal fins already exhibit pterygiophores and a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Silverside; Larval development; Early juvenile; Ontogeny.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000300016
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Development, structure and distribution of colleters in Mandevilla illustris and M. velutina (Apocynaceae) Rev. Bras. Bot.
APPEZZATO-DA-GLÓRIA,BEATRIZ; ESTELITA,MARIA EMÍLIA MARANHÃO.
Colleters of Mandevilla illustris and M. velutina are present on the cotyledons, shoot apices, mature leaves and on the nodal region, where they are interpetiolar and intrapetiolar. In M. velutina there are two colleters on the adaxial basal part of the leaf blade, and in M. illustris, this number varies. The differentiation of the colleters occurs in the early stages of leaf development. When colleters are mature, they consist of a long head on a short stalk. The central core of the colleter is made up of parenchymatous cells that may exhibit phenolic compounds and is surrounded by radially elongated epithelial cells. The foliar and intrapetiolar colleters can exhibit vascularization. The colleters produce a translucient sticky substance that reacts...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Colleters; Mandevilla; Apocynaceae; Anatomy; Ontogeny.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000200001
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Diet-induced developmental plasticity in life histories and energy metabolism in a beetle RChHN
URREJOLA,SERGIO; NESPOLO,ROBERTO; LARDIES,MARCO A.
Adaptive phenotypic plasticity, has been recognized as an important strategy by which organisms maximize fitness in variable environments, which vary through development. A disassociation among stages should represent a null effect of the environment experienced during early ontogeny in the expression of adult traits. Food quality greatly influences survival, development and reproduction in many arthropod herbivores. We examined the effects of diet protein in physiological and life-history traits in the yellow mealworm beetle Tenebrio molitor through ontogeny. We established four experimental treatments: Low Protein (LP), Low Protein Control (LPC), High Protein (HP), and High Protein Control (HPC) with recently eclosioned larvae each. Individuals were...
Tipo: Journal article Palavras-chave: CO2 production; Complex life-cycle; Food quality; Metabolism; Ontogeny.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000400005
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Ecología trófica del gatuzo, Mustellus schmitti (Springer 1939), en el Mar Argentino OceanDocs
Belleggia, M..
The narrownose smoothhound shark Mustelus schmitti is a benthic shark distributed from Florianópolis (27°S, Brazil) to Deseado River Estuary (47º45´S, Argentina) and occurs from shallow waters to 120m. This Thesis describes the feeding ecology of narrownose smoothhound shark M. schmitti in northern Argentinean Continental Shelf and is structured in four chapters. Chapter 1 contains an introduction and includes purpose, theory and concepts. In Chapter 2, the food habits of M. schmitti were studied based on analysis of stomach contents from specimens collected during the years 2008-2011. Of a total of 959 stomachs sampled during this period, 944 (98,43%) contained food. Prey items were identified to the lowest possible taxonomic level, counted and weighted....
Tipo: Theses and Dissertations Palavras-chave: Feeding behaviour; Trophic levels; Stomach content; Predator prey interactions; Ontogeny; Shark fisheries; Mustellus schmitti; Polychaeta; Marine environment.
Ano: 2012 URL: http://hdl.handle.net/1834/4775
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Estrutura e desenvolvimento dos tricomas secretores em folhas de Piper regnellii (Miq.) C. DC. var. regnellii (Piperaceae) Rev. Bras. Bot.
SILVA,ELAINE MARIA J.; MACHADO,SILVIA RODRIGUES.
Nesta espécie ocorrem dois tipos de tricomas secretores: glândula perolada e tricoma saculiforme. Ambos originam-se na protoderme do primórdio foliar e atingem sua maturidade nas folhas jovens presentes no ápice caulinar. A densidade dos dois tipos de tricomas diminui durante a expansão do limbo, sendo raros na folha adulta. As glândulas peroladas são constituídas por uma célula basal e por uma célula apical grande cuja forma varia de semi-globóide a espatulada. A liberação da secreção ocorre após a ruptura da cutícula distendida. Os tricomas saculiformes são constituídos por uma célula basal, 1-2 células colares e uma célula apical cônica, de posição inclinada à superfície foliar. A secreção acumula-se em espaços subcuticulares diminutos, não tendo sido...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Piperaceae; Piper regnellii; Ontogeny; Glandular trichomes; Secretion.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000200002
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Etude comparative du développement des larves de poissons élevées en conditions intensives et semi-extensives : Ontogénèse et performances zootechniques OceanDocs
Zouiten El Abed, D..
Le développement de l’aquaculture repose avant tout sur l’approvisionnement en specimens à élever mais pour la majorité des espèces, le recrutement naturel est insuffisant pour constituer une base d’élevages à grandes échelles. La production aquacole tunisienne est essentiellement piscicole et l’élevage extensif dans les barrages y contribue de façon importante. L'élevage des larves de poissons constitue une étape incontournable pour la production d’alevins destinés à la pisciculture et aux efforts de repeuplement des lacs de barrages et lagunes côtières tunisiennes. Dans cette thèse, des élevages larvaires expérimentaux en mésocosme ainsi que des études comparatives entre les larves élevées avec les techniques intensives et semi-extensives ont été...
Tipo: Theses and Dissertations Palavras-chave: Larval development; Rearing; Ontogeny; Aquaculture; Mesocosms.
Ano: 2012 URL: http://hdl.handle.net/1834/5529
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Evolutionary side-steps Naturalis
Sluys, Ronald.
Many of the lower metazoans reach adulthood via complex developmental stages. Each of these stages is described with a specialized terminology, which is different for every major group of organisms. Biologists with a proper training in biodiversity may have learned about these complex issues during their undergraduate days, but many of us do no longer encounter the intricacies of lower metazoan development in later stages of our careers. We may be familiar with the ontogenetic stages in the group on which we specialize, but only a few will have practical knowledge and an overview of the larval stages in such groups as crustaceans, echinoderms, polychaetes, sipunculans, molluscs, flatworms, bryozans, and nemertines. Donald Williamson certainly belongs to...
Tipo: Article / Letter to the editor Palavras-chave: Ontogeny; Larvae; Evolutionary theory; Parallelism; Homology.
Ano: 1992 URL: http://www.repository.naturalis.nl/record/504508
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Expressão do potencial de rendimento de cultivares de soja. Repositório Alice
NAVARRO JÚNIOR, H.M.; COSTA, J.A..
A soja possui alto potencial de rendimento de grãos, mas em virtude da interação genótipo vs. ambiente esse potencial não é verificado em sua totalidade. Utilizando-se seis genótipos de soja de diferentes ciclos, objetivou-se estudar a expressão do potencial de rendimento de grãos e quantificá-lo durante a ontogenia. O experimento foi conduzido no ano agrícola 1996/97 na Estação Experimental Agronômica da Universidade Federal do Rio Grande do Sul, Eldorado do Sul, RS. As avaliações foram realizadas em plantas individuais e se estenderam desde o estádio de floração até o de maturação. Os resultados obtidos indicam que alto potencial de rendimento não necessariamente identifica uma planta eficiente na retenção das estruturas reprodutivas. Os potenciais de...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Glycine max; Grãos; Ontogenia; Componentes de rendimento; Grain; Ontogeny; Yield components.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/handle/doc/106778
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Growth, Shedding and Food Intake in Captive Eunectes murinus (Linnaeus, 1758) (Serpentes: Boidae) International Journal of Morphology
Lamonica,Rita de Cássia; Abrahao-Charles,Henrique; Loguercio,Mariana Fiuza de Castro; Rocha-Barbosa,Osear.
The anaconda Eunectes murinus (Linnaeus, 1758) inhabits large hydrographic basins in tropical America and figures among the world's largest snakes, attaining a length of 12 m. This study analyzed the growth of three female anaconda siblings, with records from their birth in captivity up to around 14 months of age. The snakes were kept in a controlled environment with constant temperature and data related to biometry, feeding and skin shedding were recorded. At the end of these 445 days, the siblings had grown on average 2.6 times their initial length and increased their initial weight by 3830.lOg, incorporating about 43.5% of total food ingested to their body mass. They showed a total of 0.69 skin sheddings per month in that period, and did not exhibit...
Tipo: Journal article Palavras-chave: Anaconda; Biometry; Litter; Ecdysis; Ontogeny.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100014
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Historia de vida temprana de la corvina rubia (Micropogonias furnieri, Sciaenidae) en el Estuario del Río de La Plata OceanDocs
Braverman, M..
This study encompasses the bio-physical interactions of whitemouth croaker (Micropogonias furnieri) early life stages living in La Plata estuary (Argentina-Uruguay, South America) to understand how they take advantage of the estuarine dynamics while traveling from spawning to nursery areas and undergoing ontogenetic and associated ecological changes. The analyses used include studies of spatio-temporal distribution length-dependent patterns; growth patterns looking for settlement marks in otoliths; and development related to metamorphosis and ontogenetic variations of the diet and trophic level. Samples and data come from vertically stratified samplings from 3 cruises (2005, 2006 and 2009). Distributional data also comes from an historic database. Results...
Tipo: Theses and Dissertations Palavras-chave: Fish larvae; Developmental stages; Metamorphosis; Larval settlement; Ontogeny; Saline fronts; Estuarine dynamics.
Ano: 2011 URL: http://hdl.handle.net/1834/4187
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Host utilization during ontogeny by two pycnogonid species (Tanystylum duospinum and Ammothea hilgendorfi) parasitic on the hydroid Eucopella everta (Coelenterata: Campanulariidae) Naturalis
Russel, David J.; Hedgpeth, Joel W..
The calyptoblast hydroids Aglaophenia struthionides (Murray, 1860), Eucopella (= Campanularia) everta (Clark, 1896), and Abietinaria spp. in the low intertidal zone at Mussel Point, Pacific Grove, Monterey Bay, California, often bear the adult pycnogonids Tanystylum duospinum Hilton, 1939 and Ammothea hilgendorfi (Böhm, 1879). Larval stages of these pycnogonids were found living and feeding on Eucopella everta. The larvae of Tanystylum duospinum are ectoparasitic. Those of Ammothea hilgendorfi are endoparasitic in the gastrovascular cavities of hydranths. Larvae of both species feed on the gut contents of Eucopella everta, often on the same hydroid colony.
Tipo: Article / Letter to the editor Palavras-chave: Pycnogonids; Host; Hydroids; Ontogeny; Monterey Bay.
Ano: 1990 URL: http://www.repository.naturalis.nl/record/504291
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