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Pesquisa : B01.650.940.800.575.912.250.204 [Categoria DeCS]
Referências encontradas : 71 [refinar]
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  1 / 71 MEDLINE  
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[PMID]:28640298
[Au] Autor:Pinela J; Prieto MA; Antonio AL; Carvalho AM; Oliveira MBPP; Barros L; Ferreira ICFR
[Ad] Endereço:Mountain Research Centre (CIMO), ESA, Polytechnic Institute of Bragança, Campus de Santa Apolónia, 1172, 5300-253 Bragança, Portugal. iferreira@ipb.pt.
[Ti] Título:Ellagitannin-rich bioactive extracts of Tuberaria lignosa: insights into the radiation-induced effects in the recovery of high added-value compounds.
[So] Source:Food Funct;8(7):2485-2499, 2017 Jul 19.
[Is] ISSN:2042-650X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Ellagitannins are polyphenols responsible for a number of bioactivities and health-promoting effects. These industrially important molecules can be affected by post-harvest treatments and recovery processes, but little is known about the irradiation-induced effects on their integrity, bioactivity and extractability. Herein, the impact of gamma radiation on the production of ellagitannin-rich extracts was investigated using Tuberaria lignosa as a case study. These effects were compared with those induced in flavonoids and organic acids. The extracts were particularly rich in hydrophilic antioxidants (measured by in vitro assays). The recovery of different phytochemicals was favoured by longer extraction times. Ellagitannins (mainly punicalagin derivatives) were extracted better from samples irradiated at 5 kGy and were not significantly affected by the 10 kGy dose. However, the total contents of flavonoids and organic acids were decreased by the consequent increase in irradiation dose. Therefore, this study supports the use of gamma radiation for processing T. lignosa, aiming to obtain ellagitannin-rich bioactive extracts.
[Mh] Termos MeSH primário: Antioxidantes/análise
Cistaceae/química
Cistaceae/efeitos da radiação
Taninos Hidrolisáveis/análise
Extratos Vegetais/análise
[Mh] Termos MeSH secundário: Cromatografia Líquida de Alta Pressão
Raios gama
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antioxidants); 0 (Hydrolyzable Tannins); 0 (Plant Extracts); 0 (ellagitannin)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170830
[Lr] Data última revisão:
170830
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170623
[St] Status:MEDLINE
[do] DOI:10.1039/c7fo00500h


  2 / 71 MEDLINE  
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[PMID]:28609977
[Au] Autor:Wood TJ; Cross I
[Ad] Endereço:Department of Entomology, Michigan State University, East Lansing, MI 48824, United States of America.. thomaswood734@gmail.com.
[Ti] Título:Camptopoeum (Camptopoeum) baldocki spec. nov., a new panurgine bee species from Portugal and a description of the male of Flavipanurgus fuzetus Patiny (Andrenidae: Panurginae).
[So] Source:Zootaxa;4254(2):285-293, 2017 Apr 12.
[Is] ISSN:1175-5334
[Cp] País de publicação:New Zealand
[La] Idioma:eng
[Ab] Resumo:Camptopoeum (Camptopoeum) baldocki spec. nov., a new European panurgine bee species is described and diagnosed. It is currently known only from saltmarshes along the southern coast of the central and eastern Algarve, Portugal. Observations and analysis of scopal pollen loads suggest narrow oligolecty on the similarly halophilous Frankenia laevis (Frankeniaceae). In addition, the allotype male of the Portuguese endemic Flavipanurgus fuzetus Patiny is described and the pollen preferences of Flavipanurgus are reviewed with the addition of new data from Portugal. As a genus, Flavipanurgus species appear to be narrowly oligolectic on a range of flowers from the botanical families Caryophyllaceae, Cistaceae and Crassulaceae.
[Mh] Termos MeSH primário: Abelhas
[Mh] Termos MeSH secundário: Distribuição Animal
Animais
Cistaceae
Flores
Masculino
Pólen
Portugal
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170809
[Lr] Data última revisão:
170809
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170615
[St] Status:MEDLINE
[do] DOI:10.11646/zootaxa.4254.2.9


  3 / 71 MEDLINE  
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[PMID]:28306206
[Au] Autor:Baldemir A; Göksen N; Ildiz N; Karatoprak GS; Kosar M
[Ad] Endereço:Department of Pharmaceutical Botany, Erciyes University, TR-38039, Kayseri.
[Ti] Título:Phytochemical Profile and Biological Activities of Helianthemum canum l. baumg. from Turkey.
[So] Source:Chem Biodivers;14(7), 2017 Jul.
[Is] ISSN:1612-1880
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:In the current study, antioxidant, antibacterial activities, and the phenolic compositions of extracts from Helianthemum canum L. Baumg. (Apiaceae) aerial parts were investigated for the first time. The H. canum was extracted with 70% methanol (HCMeOH) and water (HCW). Both extracts were determined by total phenolic contents (3 mg/ml), flavonoids (1.5 mg/ml), flavonols (1.5 mg/ml), qualitative-quantitative compositions, iron (II) chelation activities (0.1 - 5 mg/ml), free radical scavenging activities (DPPH : 0.01 - 0.6 mg/ml and ABTS : 0.125 - 0.5 mg/ml) and the effect upon inhibition of ß-carotene/linoleic acid co-oxidation (1 mg/ml). The peroxidation level was also determined using the thiobarbituric acid method (0.01 - 1.5 mg/ml). The results of the activity tests given as IC values were estimated from non-linear algorithm and compared with standards. Antibacterial activities of extracts and standards were evaluated against Gram-negative and -positive ten standard strains using disc diffusion and broth microdilution methods. The MIC results (312.5 - 2500 µg/ml) against tested microorganisms varied from 625 to 2500 µg/ml. In HPLC analysis, 3,5-dihydroxybenzoic acid was found as the main substance in both extracts. These results showed that HCMeOH was richer in phenolic compounds (284.13 ± 0.30 mg GAE/g extract) from HCW (244.55 ± 0.35 mg GAE/g extract) In conclusion, H. canum extracts showed in vitro antibacterial and antioxidant activities.
[Mh] Termos MeSH primário: Cistaceae/química
Compostos Fitoquímicos/análise
[Mh] Termos MeSH secundário: Antibacterianos/química
Antibacterianos/isolamento & purificação
Antibacterianos/farmacologia
Antioxidantes/química
Antioxidantes/isolamento & purificação
Antioxidantes/farmacologia
Bactérias/efeitos dos fármacos
Hidroxibenzoatos/isolamento & purificação
Quelantes de Ferro/química
Quelantes de Ferro/isolamento & purificação
Quelantes de Ferro/farmacologia
Peroxidação de Lipídeos/efeitos dos fármacos
Metanol
Fenóis/química
Fenóis/isolamento & purificação
Fenóis/farmacologia
Compostos Fitoquímicos/farmacologia
Extratos Vegetais/química
Resorcinóis/isolamento & purificação
Turquia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Bacterial Agents); 0 (Antioxidants); 0 (Hydroxybenzoates); 0 (Iron Chelating Agents); 0 (Phenols); 0 (Phytochemicals); 0 (Plant Extracts); 0 (Resorcinols); 2WC5LMO6L1 (alpha-resorcylic acid); Y4S76JWI15 (Methanol)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170318
[St] Status:MEDLINE
[do] DOI:10.1002/cbdv.201700052


  4 / 71 MEDLINE  
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[PMID]:28208718
[Au] Autor:Chemam Y; Benayache S; Marchioni E; Zhao M; Mosset P; Benayache F
[Ad] Endereço:Unité de Recherche Valorisation des Ressources Naturelles, Molécules Bioactives et Analyses Physicochimiques et Biologiques, Université des Frères Mentouri, Constantine 1, Route d'Aïn El Bey, 25000 Constantine, Algeria. ch.jasmin@hotmail.fr.
[Ti] Título:On-Line Screening, Isolation and Identification of Antioxidant Compounds of Helianthemum ruficomum.
[So] Source:Molecules;22(2), 2017 Feb 08.
[Is] ISSN:1420-3049
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Many species (Cistaceae) are recognized for their various medicinal virtues. is an endemic species to the septentrional Sahara on which no report is available so far. The purpose of this work was to investigate the chemical composition and the radical scavenging capacity of this species and its isolated components. Collected from Mougheul (south-west of Algeria), the aerial parts were macerated with 80% EtOH/H2O, after evaporation, the remaining extract was diluted with H2O and extracted with petroleum ether, chloroform, ethyl acetate and -butanol. EtOAc and -BuOH extracts were evaluated for their free radical scavenging capacity by on-line HPLC-ABTS assay. The obtained data which were confirmed by TEAC and ORAC assays, allowed guiding the fractionation of these extracts by CC, TLC and reverse phase HPLC. Among the components, 14 were isolated and identified by spectroscopic analyses: protocatechuic acid ( ), -tiliroside ( ), -tiliroside ( ), astragalin ( ), picein ( ), vanillic acid 4- -ß-d-glucopyranoside ( ), lavandoside ( ), 4-hydroxybenzoic acid 4- -ß-d-glucopyranoside ( ), nicotiflorin ( ), rutin ( ), vicenin- ( ), narcissin ( ) and stigmasterol ( ) and ß-sitosterol ( ) as a mixture (71% and 29%, respectively). Compounds , , , , and were new for the genus . The antioxidant power of all the isolated compounds was also evaluated by HPLC-ABTS , TEAC and ORAC assays. The results clearly indicated high antioxidant potential of the extracts and tested compounds of this species especially, compounds , , , , and .
[Mh] Termos MeSH primário: Antioxidantes/química
Cistaceae/química
Extratos Vegetais/química
[Mh] Termos MeSH secundário: Antioxidantes/isolamento & purificação
Antioxidantes/farmacologia
Cromatografia Líquida de Alta Pressão
Depuradores de Radicais Livres/química
Depuradores de Radicais Livres/isolamento & purificação
Depuradores de Radicais Livres/farmacologia
Estrutura Molecular
Compostos Fitoquímicos/química
Extratos Vegetais/isolamento & purificação
Extratos Vegetais/farmacologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antioxidants); 0 (Free Radical Scavengers); 0 (Phytochemicals); 0 (Plant Extracts)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170509
[Lr] Data última revisão:
170509
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170218
[St] Status:MEDLINE


  5 / 71 MEDLINE  
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[PMID]:28104590
[Au] Autor:Chamorro D; Luna B; Moreno JM
[Ad] Endereço:Departamento de Ciencias Ambientales, Universidad de Castilla-La Mancha, Av. Carlos III s/n 45071 Toledo, Spain.
[Ti] Título:Germination responses to current and future temperatures of four seeder shrubs across a latitudinal gradient in western Iberia.
[So] Source:Am J Bot;104(1):83-91, 2017 Jan.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Species differ in their temperature germination niche. Populations of a species may similarly differ across the distribution range of the species. Anticipating the impacts of climate variability and change requires understanding the differential sensitivity to germination temperature among and within species. Here we studied the germination responses of four hard-seeded Cistaceae seeders to a range of current and future temperatures. METHODS: Seeds were collected at sites across the Iberian Peninsula and exposed or not exposed to a heat shock to break dormancy, then set to germinate under four temperature regimes. Temperatures were varied daily and seasonally, simulating the temperature range across the gradient, plus an increased temperature simulating future climate. Time to germination onset and cumulative germination at the end of each season were analyzed for the effects of temperature treatments, seasons, and local climate (temperature of the germination period, T ) at each site. KEY RESULTS: T was a significant covariate of germination in all species but Cistus populifolius. Temperature treatments significantly affected Cistus ladanifer, C. salviifolius, and Halimium ocymoides. Germination occurred in simulated autumn conditions, with little germination occurring at later seasons, except in unheated seeds of H. ocymoides. Exposure to a heat shock changed the sensitivity to temperature treatments and the relationships with T . CONCLUSIONS: Germination responses to temperature differ not only among species but also within species across their latitudinal range. The responses were idiosyncratic and related to the local climate of the population. This germination variability complicates generalizing the impacts of climate variability and climate change.
[Mh] Termos MeSH primário: Cistaceae/fisiologia
Germinação/fisiologia
Sementes/fisiologia
Temperatura Ambiente
[Mh] Termos MeSH secundário: Altitude
Cistaceae/classificação
Cistus/classificação
Cistus/fisiologia
Clima
Mudança Climática
Ecossistema
Geografia
Modelos Lineares
Portugal
Estações do Ano
Espanha
Especificidade da Espécie
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170815
[Lr] Data última revisão:
170815
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170121
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1600278


  6 / 71 MEDLINE  
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[PMID]:27417554
[Au] Autor:Benabdelaziz I; Marcourt L; Benkhaled M; Wolfender JL; Haba H
[Ad] Endereço:a Laboratoire de Chimie et Chimie de l'Environnement (L.C.C.E), Faculté des Sciences de la Matière, Département de Chimie , Université de Batna-1 , Batna , Algérie.
[Ti] Título:Antioxidant and antibacterial activities and polyphenolic constituents of Helianthemum sessiliflorum Pers.
[So] Source:Nat Prod Res;31(6):686-690, 2017 Mar.
[Is] ISSN:1478-6427
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this study, the various extracts of aerial parts of Helianthemum sessiliflorum Pers. were examined in vitro for possible source of antioxidants and for antibacterial activity. The antioxidant activity was performed by DPPH radical scavenging method which showed that ethyl acetate extract possessed the best antioxidant potential (IC = 32.75 ± 2.07 µg/mL). The significant linear correlation was realised between the values of the total phenolic/flavonoid content and antioxidant activity of plant extracts. The ethyl acetate and n-butanol extracts showed moderate antibacterial activity. In addition, the phytochemical study of n-butanol extract afforded nine known phenolic compounds (1-9). This is the first report of six of them (1, 3, 5-8) in Cistaceae family. The structural identification of the isolated compounds was achieved using several spectroscopic methods.
[Mh] Termos MeSH primário: Antibacterianos/farmacologia
Antioxidantes/farmacologia
Cistaceae/química
Componentes Aéreos da Planta/química
Extratos Vegetais/química
Extratos Vegetais/farmacologia
Polifenóis/química
Polifenóis/farmacologia
[Mh] Termos MeSH secundário: 1-Butanol
Acetatos
Bactérias/efeitos dos fármacos
Compostos de Bifenilo/química
Flavonoides/isolamento & purificação
Flavonoides/farmacologia
Depuradores de Radicais Livres/química
Depuradores de Radicais Livres/farmacologia
Testes de Sensibilidade Microbiana
Fenóis/isolamento & purificação
Fenóis/farmacologia
Picratos/química
Solventes
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acetates); 0 (Anti-Bacterial Agents); 0 (Antioxidants); 0 (Biphenyl Compounds); 0 (Flavonoids); 0 (Free Radical Scavengers); 0 (Phenols); 0 (Picrates); 0 (Plant Extracts); 0 (Polyphenols); 0 (Solvents); 76845O8NMZ (ethyl acetate); 8PJ61P6TS3 (1-Butanol); DFD3H4VGDH (1,1-diphenyl-2-picrylhydrazyl)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160716
[St] Status:MEDLINE
[do] DOI:10.1080/14786419.2016.1209669


  7 / 71 MEDLINE  
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[PMID]:26998911
[Au] Autor:Chamorro D; Luna B; Ourcival JM; Kavgaci A; Sirca C; Mouillot F; Arianoutsou M; Moreno JM
[Ad] Endereço:Departamento de Ciencias Ambientales, Universidad de Castilla-La Mancha, Toledo, Spain.
[Ti] Título:Germination sensitivity to water stress in four shrubby species across the Mediterranean Basin.
[So] Source:Plant Biol (Stuttg);19(1):23-31, 2017 Jan.
[Is] ISSN:1438-8677
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Mediterranean shrublands are generally water-limited and fire-driven ecosystems. Seed-based post-fire regeneration may be affected by varying rainfall patterns, depending on species sensitivity to germinate under water stress. In our study, we considered the germination response to water stress in four species from several sites across the Mediterranean Basin. Seeds of species with a hard coat (Cistus monspeliensis, C. salviifolius, Cistaceae, Calicotome villosa, Fabaceae) or soft coat (Erica arborea, Ericaceae), which were exposed or not to a heat shock and smoke (fire cues), were made to germinate under water stress. Final germination percentage, germination speed and viability of seeds were recorded. Germination was modelled using hydrotime analysis and correlated to the water balance characteristics of seed provenance. Water stress was found to decrease final germination in the three hard-seeded species, as well as reduce germination speed. Moreover, an interaction between fire cues and water stress was found, whereby fire cues increased sensitivity to water stress. Seed viability after germination under water stress also declined in two hard-seeded species. Conversely, E. arborea showed little sensitivity to water stress, independent of fire cues. Germination responses varied among populations of all species, and hydrotime parameters were not correlated to site water balance, except in E. arborea when not exposed to fire cues. In conclusion, the species studied differed in germination sensitivity to water stress; furthermore, fire cues increased this sensitivity in the three hard-seeded species, but not in E. arborea. Moreover, populations within species consistently differed among themselves, but these differences could only be related to the provenance locality in E. arborea in seeds not exposed to fire cues.
[Mh] Termos MeSH primário: Cistaceae/fisiologia
Cistus/fisiologia
Ericaceae/fisiologia
Fabaceae/fisiologia
Germinação
Sementes/fisiologia
[Mh] Termos MeSH secundário: Desidratação
Geografia
Região do Mediterrâneo
Fumaça
Fatores de Tempo
Água/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Smoke); 059QF0KO0R (Water)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170117
[Lr] Data última revisão:
170117
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160322
[St] Status:MEDLINE
[do] DOI:10.1111/plb.12450


  8 / 71 MEDLINE  
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[PMID]:27387134
[Au] Autor:Lecomte X; Fedriani JM; Caldeira MC; Clemente AS; Olmi A; Bugalho MN
[Ad] Endereço:Forest Research Center (CEF), School of Agriculture, University of Lisbon, Lisbon, Portugal.
[Ti] Título:Too Many Is Too Bad: Long-Term Net Negative Effects of High Density Ungulate Populations on a Dominant Mediterranean Shrub.
[So] Source:PLoS One;11(7):e0158139, 2016.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Plant-animal interactions imply costs and benefits with net balance depending on interacting species and ecological context. Ungulates, in particular, confer costs (e.g., plant leaf consumption, flower bud predation) and benefits (e.g., plant overcompensation, seed dispersal) to plants. Magnitude of costs and benefits may be altered by habitat management or ecological conditions favoring high density ungulate populations. Little is known however on whether plant costs or benefits predominate over the years, or the long-term outcomes of plant-animal interactions in habitat types sustaining high density ungulate populations. We investigated how high density ungulate populations alter plant costs and benefits by quantifying ungulate long-term effects on the shrub Cistus ladanifer (Cistaceae) individual size, seed weight and number, seed bank, and population density, through a 12-year ungulate exclusion experiment in a Mediterranean scrubland. We monitored plant size and flower buds in plants exposed or protected from ungulates and number of developed capsules and seeds consumed (potential seed dispersal) by ungulates during three reproductive seasons. We found that ungulates negatively affected shrub size and led to a dramatically decline of shrub reproductive structures and seed production, affecting the plant reproductive cycle. Number of buds was 27 times higher and number of developed seed 5 times higher in ungulate-excluded as compared to ungulate-exposed plots. After 9 years of ungulate exclusion, the C. ladanifer seed bank was 2.6 times higher in ungulate-excluded plots. The population density of C. ladanifer was 4 times higher in ungulate-excluded plots. Our long-term experiment showed that high density ungulate populations can alter plant-animal interactions by reducing plant benefits and increasing plant costs.
[Mh] Termos MeSH primário: Cistaceae/fisiologia
Cervos
Sementes/fisiologia
[Mh] Termos MeSH secundário: Animais
Ecossistema
Herbivoria
Densidade Demográfica
Dinâmica Populacional
Estações do Ano
Dispersão de Sementes
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170726
[Lr] Data última revisão:
170726
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160709
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0158139


  9 / 71 MEDLINE  
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[PMID]:27262434
[Au] Autor:Navarro-Ródenas A; Berná LM; Lozano-Carrillo C; Andrino A; Morte A
[Ad] Endereço:Thader Biotechnology SL, Ed. Parque Científico 6, Campus de Espinardo, 30100, Murcia, Spain.
[Ti] Título:Beneficial native bacteria improve survival and mycorrhization of desert truffle mycorrhizal plants in nursery conditions.
[So] Source:Mycorrhiza;26(7):769-79, 2016 Oct.
[Is] ISSN:1432-1890
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Sixty-four native bacterial colonies were isolated from mycorrhizal roots of Helianthemum almeriense colonized by Terfezia claveryi, mycorrhizosphere soil, and peridium of T. claveryi to evaluate their effect on mycorrhizal plant production. Based on the phylogenetic analysis of the 16S rDNA partial sequence, 45 different strains from 17 genera were gathered. The largest genera were Pseudomonas (40.8 % of the isolated strains), Bacillus (12.2 % of isolated strains), and Varivorax (8.2 % of isolated strains). All the bacteria were characterized phenotypically and by their plant growth-promoting rhizobacteria (PGPR) traits (auxin and siderophore production, phosphate solubilization, and ACC deaminase activity). Only bacterial combinations with several PGPR traits or Pseudomonas sp. strain 5, which presents three different PGPR traits, had a positive effect on plant survival and growth. Particularly relevant were the bacterial treatments involving auxin release, which significantly increased the root-shoot ratio and mycorrhizal colonization. Moreover, Pseudomonas mandelii strain 29 was able to considerably increase mycorrhizal colonization but not plant growth, and could be considered as mycorrhiza-helper bacteria. Therefore, the mycorrhizal roots, mycorrhizosphere soil, and peridium of desert truffles are environments enriched in bacteria which may be used to increase the survival and mycorrhization in the desert truffle plant production system at a semi-industrial scale.
[Mh] Termos MeSH primário: Ascomicetos/fisiologia
Bactérias/classificação
Cistaceae/microbiologia
Micorrizas/fisiologia
Simbiose/fisiologia
[Mh] Termos MeSH secundário: Agricultura
Bactérias/genética
Fenômenos Fisiológicos Bacterianos
Filogenia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1702
[Cu] Atualização por classe:171011
[Lr] Data última revisão:
171011
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160606
[St] Status:MEDLINE
[do] DOI:10.1007/s00572-016-0711-6


  10 / 71 MEDLINE  
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[PMID]:27220206
[Au] Autor:Dahlgren JP; Bengtsson K; Ehrlén J
[Ti] Título:The demography of climate-driven and density-regulated population dynamics in a perennial plant.
[So] Source:Ecology;97(4):899-907, 2016 Apr.
[Is] ISSN:0012-9658
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Identifying the internal and external drivers of population dynamics is a key objective in ecology, currently accentuated by the need to forecast the effects of climate change on species distributions and abundances. The interplay between environmental and density effects is one particularly important aspect of such forecasts. We examined the simultaneous impact of climate and intraspecific density on vital rates of the dwarf shrub Fumana procumbens over 20 yr, using generalized additive mixed models. We then analyzed effects on population dynamics using integral projection models. The population projection models accurately captured observed fluctuations in population size. Our analyses suggested the population was intrinsically regulated but with annual fluctuations in response to variation in weather. Simulations showed that implicitly assuming variation in demographic rates to be driven solely by the environment can overestimate extinction risks if there is density dependence. We conclude that density regulation can dampen effects of climate change on Fumana population size, and discuss the need to quantify density dependence in predictions of population responses to environmental changes.
[Mh] Termos MeSH primário: Cistaceae/fisiologia
Mudança Climática
[Mh] Termos MeSH secundário: Cistaceae/crescimento & desenvolvimento
Ecossistema
Dinâmica Populacional
Suécia
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1606
[Cu] Atualização por classe:160525
[Lr] Data última revisão:
160525
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160526
[St] Status:MEDLINE



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