Consulta: subjectFacets:"Altitudinal gradient"
Registros recuperados: 14
Data/hora: 16/06/2024 09:03:45

Plant communities as bioclimate indicators on Isla Navarino, one of the southernmost forested areas of the world
Provedor de dados: 73
Autores: Molina,José Antonio; Lumbreras,Ana; Benavent-González,Alberto; Rozzi,Ricardo; Sancho,Leopoldo G.
ABSTRACT Variation in climactic vegetation with altitude is widely used as an ecological indicator to identify bioclimatic belts. Tierra del Fuego is known to undergo structural and functional changes in forests along altitudinal gradients. However there is still little knowledge of the changes in plant-community composition and plant diversity -including both forests and tundra and their area of contact (krummholz)- and their relation to climatic factors along an altitudinal gradient. This study focuses on Isla Navarino (Chile), at the eastern part of Beagle Channel, included in the Cape Horn Biosphere Reserve. Numerical analysis revealed four community types along the cited gradient: a) mixed forest of Nothofagus betuloides and Nothofagus pumilio...
Tipo: Journal article
Palavras-chave: Altitudinal gradient; Bioclimatic zones; Cape Horn Biosphere Reserve; Species diversity; Sub-Antarctic habitats.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200391

Convergence in the variation of local and regional galling species richness
Provedor de dados: 82
Autores: Carneiro,Marco A.A.; Fernandes,G.W.; De Souza,O.F.F.
We investigate the local and regional determinants of galling insect richness on the dioecious shrub Baccharis concinna Barroso (Asteraceae) in the southeastern portion of the Espinhaço Mountains in Brazil. The total number of galling species and the richness of galling Cecidomyiidae (Diptera) were influenced by plant gender. Male plants supported a higher richness of galling insects than female plants, supporting the hypothesis of sex-biased herbivory at the community level. The total number of galling species and the richness of galling cecidomyiids showed a peak at intermediate altitudes. The richness of all galling species and galling cecidomyiids were strongly influenced by habitat. Plants in xeric habitats supported more galling species than plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altitudinal gradient; Baccharis concinna; Diversity; Ecological community; Herbivore.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000400003

Altitudinal distribution and body resource allocation in a High Mountain social wasp (Hymenoptera: Vespidae)
Provedor de dados: 82
Autores: Rodríguez-Jimenez,Andrea; Sarmiento,Carlos E.
Jame's rule proposes a direct relationship between body size and altitude. There are several studies about this rule; however, few studies analyze proportional changes in body parts along gradients. The morphological variation of Agelaia pallipes (Olivier) in five sites along an altitudinal gradient (2600-3380 m) in the Santuario de Iguaque, Colombia, were studied in order to test whether or not the species follows Jame's rule, and whether body parts follow a homogeneous variation. Body variation analysis was conducted through multivariate analysis of variance (MANOVA) and the relationship between altitude and each morphometric measurement was studied through regression analyses. The MANOVA indicated significant differences among sites. An increase in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jame's rule; Bergmann's rule; Altitudinal gradient; Agelaia; Trade-off.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000100001

Multiple dormancy and maternal effect on Miconia ferruginata (Melastomataceae) seed germination, Serra de Caldas Novas, Goiás, Brazil
Provedor de dados: 88
Autores: Mendes-Rodrigues,Clesnan; Araújo,Francielle Paulina de; Barbosa-Souza,Cláudia; Barbosa-Souza,Valéria; Ranal,Marli A.; Santana,Denise Garcia de; Oliveira,Paulo Eugênio.
Species with mostly asexual reproduction are interesting subjects for germination studies since variation would be more easily linked to environmental factors. Miconia ferruginata DC. is an apomictic treelet in Brazilian cerrado areas on rocky outcrops. Germination of seeds collected from individuals occurring in the Serra de Caldas Novas State Park, Goiás, was studied in three experiments under controlled conditions. Germination characteristics differed among individuals and were correlated with altitude and soil Al content. Seeds from plants growing at lower altitudes, with lower soil aluminium content, presented malformed seeds with absence of embryo which rendered lower, but better synchronized germination. The nested analysis showed that from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altitudinal gradient; Campo rupestre; Cerrado; Dormancy; Tropical savanna.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042010000100009

Bird species diversity in the Atlantic Forest of Brazil is not explained by the Mid-domain Effect
Provedor de dados: 103
Autores: Cavarzere,Vagner; Silveira,Luís Fábio.
The Atlantic Forest is an excellent case study for the elevational diversity of birds, and some inventories along elevational gradients have been carried out in Brazil. Since none of these studies explain the patterns of species richness with elevation, we herein review all Brazilian studies on bird elevational diversity, and test a geometric constraint null model that predicts a unimodal species-altitude curve, the Mid-domain Effect (MDE). We searched for bird inventories in the literature and also analysed our own survey data using limited-radius point counts along an 800 m elevational gradient in the state of São Paulo, Brazil. We found 10 investigations of elevational diversity of Atlantic Forest birds and identified five different elevational...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altitudinal gradient; Avian species richness; Geometric constraints; Mountain ecology; Null model; Rain forest.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000400001

Parasite loads and altitudinal distribution of Liolaemus lizards in the central Chilean Andes
Provedor de dados: 97
Autores: CAROTHERS,JOHN H.; JAKSIC,FABIÁN M.
This study compared the distributions of ten species of Liolaemus lizards in the central Chilean Andes to the distributions of four types of parasites: malaria-causing Plasmodium, gut nematodes, ticks, and mites. We wanted to see if parasite numbers might be a factor in determining distributional limits of the lizards. We found that there was no evidence of malarial infestation of the lizards, that ticks were almost absent, that more often than not mite numbers decreased at the distributional limits of the lizards, and that gut nematodes confined to the herbivorous lizards in our sample may well be beneficial rather than detrimental. Rather than parasitism, other biotic interactions (e.g., predation or competition) are more likely candidates as factors...
Tipo: Journal article
Palavras-chave: Malaria; Plasmodium; Gut nematodes; Ticks; Mites; Chile; Altitudinal gradient.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300013

Relationship between climate and geographical variation of local woody species richness within the Mediterranean-type region of Chile
Provedor de dados: 97
Autores: Becerra,Pablo I.
BACKGROUND: Latitudinal and altitudinal patterns of plant species richness have frequently been related to different climate variables such as precipitation, temperature and evapotranspiration. However, studies assessing this relationship have mostly compared different regions and used regional scales of richness (in quadrants of several km²). It is less known the relationship between climate and geographical patterns of species richness in local scales (richness in &lt; 1 ha plots). For central Chile some studies have described geographical patterns of plant species richness, but only using regional scales to quantify richness. It is not known how local richness of plant species varies geographically and if climate variables are related to this variation....
Tipo: Journal article
Palavras-chave: Altitudinal gradient; Latitudinal gradient; Mediterranean-type climate; Sclerophyllous forest; Species diversity.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100012

Altitudinal zonation among lizards of the genus Liolaemus: questions answered and unanswered questions
Provedor de dados: 97
Autores: CAROTHERS,JOHN H.; JAKSIC,FABIÁN M.; MARQUET,PABLO A.
We review factors influencing Liolaemus distributions in the central Chilean Andes and suggest areas of future research. Our previous studies reveal that lizard parasites (ectoparasitic mites and ticks, and the endoparasite Plasmodium) do not set Liolaemus altitudinal limits. Thermal tolerances do not appear to limit altitudinal distributions, although cold ambient temperatures dictate that only live-bearing species can occur above 2,400 m elevation. Three Liolaemus species specialize on elevationally restricted microhabitats. Liolaemus tenuis is found exclusively in or at the base of trees, which are typically below 1,800 m. Liolaemus leopardinus specializes on large rocky outcrops found at high altitudes. Liolaemus monticola uses smaller rocks: oviparity...
Tipo: Journal article
Palavras-chave: Altitudinal gradient; Central Chile; Species distribution; Thermal biology; Parasite load; Microhabitat preference; Interspecific competition.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200008

The Brahea edulis palm forest in Guadalupe Island: A North American fog oasis?
Provedor de dados: 97
Autores: GARCILLÁN,PEDRO P; VEGA,ERNESTO; MARTORELL,CARLOS.
Fog is a factor that affects deeply the structure of vegetation of coastal deserts. Guadalupe is an oceanic island located 260 km off the coast of Baja California, and is one of the few places of the Sonoran Desert coasts with scarped coastal topography and frequent fog. With the aim to identify the effect of fog on the community of the palm forest (palmar) of Brahea edulis located in the northern tip of the island: (1) we analyzed the richness and composition of vascular plants in the palmar compared to the remainder of the island, and (2) we analyzed the altitudinal variation of the abundance of palms, herbs and mosses to identify if there is altitudinal variation of the vegetation. Although species composition was not different between palmar and the...
Tipo: Journal article
Palavras-chave: Altitudinal gradient; Coastal desert; Fog effect; Sonoran Desert; Vegetation.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000100011

VARIATION IN THE FLOWERING PHENOLOGY OF AN EPIPHYTIC BROMELIAD ALONG AN ELEVATIONAL GRADIENT
Provedor de dados: 37
Autores: López-López,Judith Isabel; Parra-Tabla,Víctor; Mondragón,Demetria.
ABSTRACT Elevational patterns in flowering phenology have been reported for trees, shrubs and herbs. However, for vascular epiphytes that rely on atmospheric sources for humidity and nutrients, and depend on phorophyte microhabitat, elevational patterns of variation are unknown. In this study, we described the flowering phenology of Tillandsia carlos-hankii, an epiphytic bromeliad, along an elevational gradient in Capulálpam de Méndez, Oaxaca. We analyzed the onset, seasonality and duration of flowering along and within different elevation zones, and we evaluated the effect of phorophyte features (tree height, DBH and canopy diameter) on flowering start date and duration. From June 2016 to May 2017, we periodically recorded phenological data from six...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altitudinal gradient; Bromeliaceae; Vascular epiphytes; Pine forest.
Ano: 2021
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2021000100042

Sexual ratio and floral biology of the dioecious Neea theifera Oerst. (Nyctaginaceae) in a cerrado rupestre of central Brazil
Provedor de dados: 39
Autores: Amorim,Felipe Wanderley; Mendes-Rodrigues,Clesnan; Maruyama,Pietro Kiyoshi; Oliveira,Paulo Eugênio.
Dioecy is characterized by a complete separation of sexual functions on male and female plants. It has evolved many times in flowering plants and is widespread among distinct Angiosperm families. It is viewed as a reproductive strategy to reduce endogamy, and to promote optimal resource allocation between male and female sexual functions. Neea theifera is a common species in Cerrado, neotropical savannas in Brazil, but information regarding its reproductive biology is still incomplete. In order to investigate how environmental conditions possibly affect this dioecious species, we studied its floral biology, sex ratio and spatial distribution of sexual morphs along a soil-altitudinal gradient. The sex ratio did not significantly deviate from the expected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altitudinal gradient; Dioecy; Neotropical savanna; Sexual structure; Pollination.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000400006

Occurrence of arbuscular mycorrhizal fungi in high altitude sites of the Patagonian Altoandina region in Nahuel Huapi National Park (Argentina)
Provedor de dados: 39
Autores: Velázquez,María Silvana; Stürmer,Sidney Luiz; Bruzone,Clara; Fontenla,Sonia; Barrera,Marcelo; Cabello,Marta.
ABSTRACT Knowledge of the occurrence and diversity of arbuscular mycorrhizal fungi (AMF) in National Parks is essential for the establishment of policies for conservation. The aim of this study was to characterize the AMF communities in the Patagonian Altoandina region in Nahuel Huapi National Park, Argentina. We surveyed AMF spores associated with the rhizospheres of 9 plant species in the Patagonian Steppe (PS), Challhuaco Hill (ChH), Catedral Hill (CH), and Tronador Hill (TH) regions and detected a total of 27 Glomeromycota species. Acaulospora laevis was dominant at all sites. The AMF community was dominated by Acaulosporaceae, as regards the number of species and contribution of each one to the total number of spores. Three Glomeromycota families were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acaulosporaceae; Altitudinal gradient; Glomeromycota; Species diversity; Spore numbers; Steppe.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000400521

A new inventory for fishes of headwater streams from the rio das Cinzas and rio Itararé basins, rio Paranapanema system, Paraná, Brazil
Provedor de dados: 49
Autores: Frota,Augusto; Ota,Renata Rúbia; Deprá,Gabriel de Carvalho; Ganassin,Maria Julia Mileo; Graça,Weferson Júnio da.
Abstract: The rio das Cinzas and rio Itararé basins are important tributaries of the rio Paranapanema, a major left-bank tributary of the upper rio Paraná basin. The upper reaches of both drainages intersect the northern portion of the APA Escarpa Devoniana (Devonian Escarpment Environment Protection Area, EPA), an area considered crucial for the preservation of biodiversity. This study aimed to provide an ichthyofaunistic inventory for headwater streams of the rio das Cinzas and rio Itararé basins, both within and off of the borders of the EPA, increasing the knowledge about the species already known from streams in the rio Paranapanema system. We found 32 fish species, representing five orders and 12 families. Siluriformes was the richest order followed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altitudinal gradient; Devonian Escarpment; Faunal exchange; Upper rio Paraná.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032020000100303

Ichthyofauna of headwater streams from the rio Ribeira de Iguape basin, at the boundaries of the Ponta Grossa Arch, Paraná, Brazil
Provedor de dados: 49
Autores: Frota,Augusto; Message,Hugo José; Oliveira,Rachel Calil de; Benedito,Evanilde; Graça,Weferson Júnio da.
Abstract: The rio Ribeira de Iguape basin (Paraná State) is highly relevant for the preservation of remnants of the Atlantic Forest. Its high levels of diversity and fish endemism explain the river dynamics promoted by the Ponta Grossa Arch, a geological structure that promotes headwater capture and isolation between the upper rio Paraná drainage, the rio Iguaçu and the rio Ribeira de Iguape. Here, our objective was to provide an unprecedented inventory for headwater streams of the rio Ribeira de Iguape basin at the boundaries of the Ponta Grossa Arch. We found 29 species of fish representing four orders and nine families. Siluriformes was the richest order followed by Characiformes. Nine species presented high abundance of sampled individuals,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altitudinal gradient; Biogeography; Coastal drainages; Ichthyology; Invasion.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000100307