Base de dados : MEDLINE
Pesquisa : G16.500.275.157.250 [Categoria DeCS]
Referências encontradas : 8746 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 875 ir para página                         

  1 / 8746 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29228938
[Au] Autor:Nishijima S; Nishikawa C; Miyashita T
[Ad] Endereço:Laboratory of Biodiversity Science, School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-8657, Japan. nishijimash@gmail.com.
[Ti] Título:Habitat modification by invasive crayfish can facilitate its growth through enhanced food accessibility.
[So] Source:BMC Ecol;17(1):37, 2017 Dec 12.
[Is] ISSN:1472-6785
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Invasive ecosystem engineers can facilitate their invasions by modifying the physical environment to improve their own performance, but this positive feedback process has rarely been tested empirically except in sessile organisms. The invasive crayfish Procambarus clarkii is an ecosystem engineer that destroys aquatic macrophytes, which provide a physical refuge for animal prey, and this destruction is likely to enhance vulnerability to predators. Using two series of mesocosm experiments, we tested the hypothesis that the invasive crayfish increases its feeding efficiency on animal prey by reducing submerged macrophytes, thus increasing its individual growth rate in a positive density-dependent manner. RESULTS: In the first experiment, increasing crayfish density reduced both macrophytes and animal prey (dragonfly and chironomid larvae) and, importantly, increased the growth rate of individual crayfish, in accordance with our expectation. In the second experiment, we used artificial macrophytes to clarify whether the physical architecture of macrophytes itself protects animal prey and limits crayfish growth rate. Increasing the artificial macrophyte quantity not only increased the survival of animal prey, but also retarded the crayfish growth rate. CONCLUSIONS: We conclude that macrophytes strengthen bottom-up control of crayfish, but this effect can be relaxed by increasing the density of crayfish via reduction in macrophytes. This positive feedback process may explain the crayfish outbreaks and regime shifts occasionally observed in invaded freshwater ecosystems.
[Mh] Termos MeSH primário: Astacoidea/fisiologia
Ecossistema
Cadeia Alimentar
Espécies Introduzidas
[Mh] Termos MeSH secundário: Animais
Astacoidea/crescimento & desenvolvimento
Chironomidae/crescimento & desenvolvimento
Comportamento Alimentar
Água Doce
Larva/crescimento & desenvolvimento
Odonatos/crescimento & desenvolvimento
Desenvolvimento Vegetal
Densidade Demográfica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171213
[St] Status:MEDLINE
[do] DOI:10.1186/s12898-017-0147-7


  2 / 8746 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29175402
[Au] Autor:Rafiee M; Dargahi L; Eslami A; Beirami E; Jahangiri-Rad M; Sabour S; Amereh F
[Ad] Endereço:Environmental and Occupational Hazards Control Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Department of Environmental Health Engineering, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
[Ti] Título:Neurobehavioral assessment of rats exposed to pristine polystyrene nanoplastics upon oral exposure.
[So] Source:Chemosphere;193:745-753, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The increasing use of plastics has raised concerns about pollution of freshwater by these polymeric materials. Knowledge about their potential effects on environmental and public health is limited. Recent publications have suggested that the degradation of plastics will result in the release of nano-sized plastic particles to the environment. Therefore, it is of utmost importance to gain knowledge about whether and how nanoplastics affect living organisms. The present study aimed to analyse potential neurobehavioral effects of polystyrene nanoparticles (PS-NPs) after long-term exposure on rat. Potential effects of PS-NPs were investigated using four test dosages (1, 3, 6, and 10 mg PS-NPs/kg of body weight/day) administrated orally with adult Wistar male rats for five weeks. Neurobehavioral tests were chosen to assess a variety of behavioral domains. Particle diameters in test suspensions were determined through dynamic light scattering and showed an average hydrodynamic diameter of approximately 38.92 nm. No statistically significant behavioral effects were observed in all tests performed (p > 0.05). In the elevated plus maze, PS-NPs-exposed rats showed greater number of entries into open arms compared to controls. Also, PS-NPs had no significant influence on body weight of animals. Taking into account the subtle and transient nature of neurobehavioral consequences, however, these results underline the possibility of even pristine plastic nanoparticles to induce behavioral alteration in the rest of the food web, including for marine biota and humans. Indeed even though studied neurobehavioral effects in our study was not statistically significant, the observed subtle effects may be clinically considerable.
[Mh] Termos MeSH primário: Comportamento Animal/efeitos dos fármacos
Poliestirenos/farmacologia
Poluentes Químicos da Água/farmacologia
[Mh] Termos MeSH secundário: Animais
Cadeia Alimentar
Seres Humanos
Masculino
Nanopartículas/efeitos adversos
Nanopartículas/metabolismo
Tamanho da Partícula
Plásticos
Ratos
Ratos Wistar
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Plastics); 0 (Polystyrenes); 0 (Water Pollutants, Chemical)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171128
[St] Status:MEDLINE


  3 / 8746 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29295998
[Au] Autor:Woodson CB; Schramski JR; Joye SB
[Ad] Endereço:School of Environmental, Civil, and Environmental Engineering, University of Georgia, Athens, GA, 30602, USA. bwoodson@uga.edu.
[Ti] Título:A unifying theory for top-heavy ecosystem structure in the ocean.
[So] Source:Nat Commun;9(1):23, 2018 01 02.
[Is] ISSN:2041-1723
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Size generally dictates metabolic requirements, trophic level, and consequently, ecosystem structure, where inefficient energy transfer leads to bottom-heavy ecosystem structure and biomass decreases as individual size (or trophic level) increases. However, many animals deviate from simple size-based predictions by either adopting generalist predatory behavior, or feeding lower in the trophic web than predicted from their size. Here we show that generalist predatory behavior and lower trophic feeding at large body size increase overall biomass and shift ecosystems from a bottom-heavy pyramid to a top-heavy hourglass shape, with the most biomass accounted for by the largest animals. These effects could be especially dramatic in the ocean, where primary producers are the smallest components of the ecosystem. This approach makes it possible to explore and predict, in the past and in the future, the structure of ocean ecosystems without biomass extraction and other impacts.
[Mh] Termos MeSH primário: Ecossistema
Peixes/fisiologia
Cadeia Alimentar
Modelos Biológicos
[Mh] Termos MeSH secundário: Animais
Antozoários/classificação
Antozoários/fisiologia
Biomassa
Tamanho Corporal
Comportamento Alimentar/fisiologia
Pesqueiros/estatística & dados numéricos
Pesqueiros/tendências
Peixes/classificação
Oceanos e Mares
Plâncton/classificação
Plâncton/fisiologia
Dinâmica Populacional
Comportamento Predatório/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180306
[Lr] Data última revisão:
180306
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180104
[St] Status:MEDLINE
[do] DOI:10.1038/s41467-017-02450-y


  4 / 8746 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29351549
[Au] Autor:García-Ruiz E; Loureiro Í; Farinós GP; Gómez P; Gutiérrez E; Sánchez FJ; Escorial MC; Ortego F; Chueca MC; Castañera P
[Ad] Endereço:Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Departamento de Protección Vegetal, Laboratorio de Malherbología, Madrid, Spain.
[Ti] Título:Weeds and ground-dwelling predators' response to two different weed management systems in glyphosate-tolerant cotton: A farm-scale study.
[So] Source:PLoS One;13(1):e0191408, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The use of glyphosate, as a post-emergence broad-spectrum herbicide in genetically modified glyphosate-tolerant (GT) cotton, supposes a big change in weed management programs with respect to a conventional regime. Thus, alterations in arable flora and arthropod fauna must be considered when evaluating their potential impacts. A 3-year farm-scale study was conducted in a 2-ha GT cotton crop, in southern Spain, to compare the effects of conventional and glyphosate herbicide regimes on weed abundance and diversity and their consequences for ground-dwelling predators. Surveys reveal that weed density was relatively low within all treatments with a few dominant species, with significantly higher weed densities and modifications of the floristic composition in glyphosate-treated plots that led to an increase in the abundance of Portulaca oleracea and to a reduction in plant diversity. The activity-density of the main predatory arthropod taxa (spiders, ground beetles, rove beetles and earwigs) varied among years, but no significant differences were obtained between conventional and glyphosate herbicide regimes. However, significant differences between treatments were obtained for ground beetles species richness and diversity, being higher under the glyphosate herbicide regime, and a positive correlation with weed density could be established for both parameters. The implications of these findings to weed control in GT cotton are discussed.
[Mh] Termos MeSH primário: Glicina/análogos & derivados
Gossypium/efeitos dos fármacos
Herbicidas/farmacologia
Plantas Daninhas/efeitos dos fármacos
Controle de Plantas Daninhas/métodos
[Mh] Termos MeSH secundário: Animais
Artrópodes/efeitos dos fármacos
Biodiversidade
Coleópteros/efeitos dos fármacos
Produtos Agrícolas/efeitos dos fármacos
Produtos Agrícolas/genética
Produtos Agrícolas/crescimento & desenvolvimento
Ecossistema
Cadeia Alimentar
Glicina/farmacologia
Gossypium/genética
Gossypium/crescimento & desenvolvimento
Resistência a Herbicidas/genética
Insetos/efeitos dos fármacos
Plantas Geneticamente Modificadas
Espanha
Aranhas/efeitos dos fármacos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Herbicides); 4632WW1X5A (glyphosate); TE7660XO1C (Glycine)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180120
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191408


  5 / 8746 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29387946
[Au] Autor:Sánchez-González B; Planillo A; Navarro-Castilla Á; Barja I
[Ad] Endereço:Department of Biology, Zoology Unit, Universidad Autónoma de Madrid, Madrid, Spain.
[Ti] Título:The concentration of fear: mice's behavioural and physiological stress responses to different degrees of predation risk.
[So] Source:Naturwissenschaften;105(1-2):16, 2018 Jan 31.
[Is] ISSN:1432-1904
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Predation is an unavoidable and dangerous fact in the lifetime of prey animals and some sign of the proximity of a predator may be enough to trigger a response in the prey. We investigated whether different degrees of predation risk by red foxes (Vulpes vulpes) evoke behavioural and physiological stress responses in wood mice (Apodemus sylvaticus). We examined the variation in mice responses due to individual factors (sex and reproductive status) and related them to the concentration of the volatile compounds from fox faeces over time. In our experiment, we introduced predation cues into four plots, each subjected to a different concentration treatment (0, 10, 50 and 100% concentration of fresh faeces of red fox), based on the following outline: initial odourless phase 0, phase1 in which predation treatment was renewed daily, and phase 2 in which we renewed the treatment only on the first day. Wood mice were live trapped during all three phases and the physiological response was measured non-invasively by analysing faecal corticosterone metabolites (FCM) in freshly collected faeces. Data were analysed by Generalized Linear Mixed Models. Overall, males were trapped less often than females, and reproductively active individuals from both sexes avoided traps more than non-reproductively active individuals, especially in medium- and high- concentration plots. Variations in FCM concentrations were explained by plot, the interaction between plot and treatment phase, and the interaction between the treatment phase and the reproductive status. During phase 1, we detected a significant rise in FCM levels that increased with predator faecal odour concentration. Additionally, reproductively active individuals showed a strong physiological response during both phases 1 and 2 in all plots, except the control plot. Our results indicated that wood mice are able to discriminate different degrees of predation risk, which allows them to trigger gradual changes in their behavioural and physiological stress responses.
[Mh] Termos MeSH primário: Medo/fisiologia
Murinae/fisiologia
Estresse Fisiológico/fisiologia
[Mh] Termos MeSH secundário: Corticosteroides/análise
Animais
Comportamento Animal
Fezes/química
Feminino
Cadeia Alimentar
Raposas/fisiologia
Masculino
Murinae/psicologia
Odorantes
Reprodução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Adrenal Cortex Hormones)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180302
[Lr] Data última revisão:
180302
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180202
[St] Status:MEDLINE
[do] DOI:10.1007/s00114-018-1540-6


  6 / 8746 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29357382
[Au] Autor:Nevers MB; Byappanahalli MN; Morris CC; Shively D; Przybyla-Kelly K; Spoljaric AM; Dickey J; Roseman EF
[Ad] Endereço:U.S. Geological Survey, Great Lakes Science Center, Lake Michigan Ecological Research Station, Chesterton, Indiana, United States of America.
[Ti] Título:Environmental DNA (eDNA): A tool for quantifying the abundant but elusive round goby (Neogobius melanostomus).
[So] Source:PLoS One;13(1):e0191720, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Environmental DNA (eDNA) is revolutionizing biodiversity monitoring, occupancy estimates, and real-time detections of invasive species. In the Great Lakes, the round goby (Neogobius melanostomus), an invasive benthic fish from the Black Sea, has spread to encompass all five lakes and many tributaries, outcompeting or consuming native species; however, estimates of round goby abundance are confounded by behavior and habitat preference, which impact reliable methods for estimating their population. By integrating eDNA into round goby monitoring, improved estimates of biomass may be obtainable. We conducted mesocosm experiments to estimate rates of goby DNA shedding and decay. Further, we compared eDNA with several methods of traditional field sampling to compare its use as an alternative/complementary monitoring method. Environmental DNA decay was comparable to other fish species, and first-order decay was lower at 12°C (k = 0.043) than at 19°C (k = 0.058). Round goby eDNA was routinely detected in known invaded sites of Lake Michigan and its tributaries (range log10 4.8-6.2 CN/L), but not upstream of an artificial fish barrier. Traditional techniques (mark-recapture, seining, trapping) in Lakes Michigan and Huron resulted in fewer, more variable detections than eDNA, but trapping and eDNA were correlated (Pearson R = 0.87). Additional field testing will help correlate round goby abundance with eDNA, providing insight on its role as a prey fish and its impact on food webs.
[Mh] Termos MeSH primário: DNA/análise
DNA/genética
Monitorização de Parâmetros Ecológicos/métodos
Peixes/genética
Espécies Introduzidas
[Mh] Termos MeSH secundário: Animais
Biodiversidade
Biomassa
Ecossistema
Cadeia Alimentar
Lagos/química
Michigan
Densidade Demográfica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
9007-49-2 (DNA)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180302
[Lr] Data última revisão:
180302
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180123
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191720


  7 / 8746 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29478636
[Au] Autor:Lu J; Yang Z; Zhang Y
[Ad] Endereço:Xi'an University of Architecture and Technology, Xi'an 710055, China. Electronic address: lujinsuo@163.com.
[Ti] Título:Algae functional group characteristics in reservoirs and lakes with different trophic levels in northwestern semi-humid and semi-arid regions in China.
[So] Source:J Environ Sci (China);64:166-173, 2018 Feb.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:In order to study the differences in algae species and their biomass in water bodies in a region, three reservoirs and two lakes at the center of Guanzhong Plain were chosen to identify algae functional groups, measure biomass, and assess water quality, from January 2013 to December 2014. The water bodies represented different trophic levels: one oligotrophic, three mesotrophic, and one eutrophic. Based on the Reynolds' functional groups, they had 10 groups in common-B, P, D, X1, M, MP, F, S1, J, and G, but the algae biomasses and proportions were different. In the oligotrophic reservoir, functional group B reached a peak biomass of 576×10 L , which accounted for 31.27%. In the eutrophic lake, functional group D reached a peak biomass of 3227×10 L , which accounted for only 13.38%. When samples collected from other water bodies with similar trophic levels were compared, we found differences in the algae species functional groups. The potential reasons for the differences in algae functional group characteristics in the different water bodies in the region were water temperature and nutritional states.
[Mh] Termos MeSH primário: Monitoramento Ambiental
Cadeia Alimentar
Lagos/química
Microalgas/fisiologia
[Mh] Termos MeSH secundário: China
Clima
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180301
[Lr] Data última revisão:
180301
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180227
[St] Status:MEDLINE


  8 / 8746 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29247931
[Au] Autor:Behrend JE; Rypstra AL
[Ad] Endereço:Department of Biology, Miami University, Oxford, OH 45056, USA.
[Ti] Título:Contact with a glyphosate-based herbicide has long-term effects on the activity and foraging of an agrobiont wolf spider.
[So] Source:Chemosphere;194:714-721, 2018 Mar.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Animals that live in conventional agroecosystems must cope with a variety of anthropogenic chemicals. Most of the focus of toxicology is on lethality, deformities, or short-term shifts in behavior. However, for animals that succeed in spite of their exposure, it is important to determine if long-term changes are brought on by their experience. We tested the hypothesis that contact with a commercial formulation of a glyphosate-based herbicide would affect the behavior of subsequent instars in the wolf spider, Pardosa milvina, a species that thrives in the agroecosystems of eastern United States. In one experiment, we housed females carrying egg sacs on a surface treated with the herbicide for 7 h. Then we monitored their activity and foraging of the offspring 4 weeks after emergence. We repeated the same tests on adults that had been housed with herbicide during their penultimate stage. In both studies, exposed spiders displayed higher levels of activity and greater capture success than their unexposed counterparts. Exposure of penultimate instar to herbicide had larger effects on the behavior of adult males than adult females. These results suggest that herbicides have the potential to adjust the behavior of individuals in the predator community. Thus, impact on the food web and their positive or negative potential for biological control may extend beyond their role in controlling weeds.
[Mh] Termos MeSH primário: Comportamento Animal/efeitos dos fármacos
Glicina/análogos & derivados
Herbicidas/farmacologia
Comportamento Predatório/efeitos dos fármacos
Aranhas/efeitos dos fármacos
[Mh] Termos MeSH secundário: Animais
Feminino
Cadeia Alimentar
Glicina/farmacologia
Masculino
Aranhas/fisiologia
Tempo
Estados Unidos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Herbicides); 4632WW1X5A (glyphosate); TE7660XO1C (Glycine)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180228
[Lr] Data última revisão:
180228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171217
[St] Status:MEDLINE


  9 / 8746 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27775385
[Au] Autor:Kengwoung-Keumo JJ
[Ad] Endereço:Department of Mathematical Sciences, Cameron University, 2800 West Gore Boulevard, Lawton, OK 73505, United States. email: jkengwou@cameron.edu.
[Ti] Título:Competition between a nonallelopathic phytoplankton and an allelopathic phytoplankton species under predation.
[So] Source:Math Biosci Eng;13(4):787-812, 2016 08 01.
[Is] ISSN:1551-0018
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:We propose a model of two-species competition in the chemostat for a single growth-limiting, nonreproducing resource that extends that of Roy [38]. The response functions are specified to be Michaelis-Menten, and there is no predation in Roy's work. Our model generalizes Roy's model to general uptake functions. The competition is exploitative so that species compete by decreasing the common pool of resources. The model also allows allelopathic effects of one toxin-producing species, both on itself (autotoxicity) and on its nontoxic competitor (phytotoxicity). We show that a stable coexistence equilibrium exists as long as (a) there are allelopathic effects and (b) the input nutrient concentration is above a critical value. The model is reconsidered under instantaneous nutrient recycling. We further extend this work to include a zooplankton species as a fourth interacting component to study the impact of predation on the ecosystem. The zooplankton species is allowed to feed only on the two phytoplankton species which are its perfectly substitutable resources. Each of the models is analyzed for boundedness, equilibria, stability, and uniform persistence (or permanence). Each model structure fits very well with some harmful algal bloom observations where the phytoplankton assemblage can be envisioned in two compartments, toxin producing and non-toxic. The Prymnesium parvum literature, where the suppressing effects of allelochemicals are quite pronounced, is a classic example. This work advances knowledge in an area of research becoming ever more important, which is understanding the functioning of allelopathy in food webs.
[Mh] Termos MeSH primário: Ecossistema
Modelos Biológicos
Fitoplâncton/fisiologia
[Mh] Termos MeSH secundário: Animais
Cadeia Alimentar
Proliferação Nociva de Algas
Toxinas Biológicas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Toxins, Biological)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:180228
[Lr] Data última revisão:
180228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE
[do] DOI:10.3934/mbe.2016018


  10 / 8746 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29301047
[Au] Autor:Stasek DJ; Radl JN; Crist TO
[Ad] Endereço:Department of Biology, Miami University, Oxford, OH.
[Ti] Título:The Effects of Dispersal and Predator Density on Prey Survival in an Insect-Red Clover Metacommunity.
[So] Source:J Insect Sci;18(1), 2018 Jan 01.
[Is] ISSN:1536-2442
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Trophic interactions are often studied within habitat patches, but among-patch dispersal of individuals may influence local patch dynamics. Metacommunity concepts incorporate the effects of dispersal on local and community dynamics. There are few experimental tests of metacommunity theory using insects compared to those conducted in microbial microcosms. Using connected experimental mesocosms, we varied the density of the leafhopper Agallia constricta Van Duzee (Homoptera: Cicadellidae) and a generalist insect predator, the damsel bug (Nabis spp., Heteroptera: Nabidae), to determine the effects of conspecific and predator density and varying the time available to dispersal among mesocosms on predation rates, dispersal rates, and leafhopper survival. Conspecific and damsel bug density did not affect dispersal rates in leafhoppers, but this may be due to leafhoppers' aversion to leaving the host plants or the connecting tubes between mesocosms hindering leafhopper movement. Leafhopper dispersal was higher in high-dispersal treatments. Survival rates of A. constricta were also lowest in treatments where dispersal was not limited. This is one of the first experimental studies to vary predator density and the time available to dispersal. Our results indicate that dispersal is the key to understanding short-term processes such as prey survival in predator-prey metacommunities. Further work is needed to determine how dispersal rates influence persistence of communities in multigenerational studies.
[Mh] Termos MeSH primário: Cadeia Alimentar
Heterópteros
[Mh] Termos MeSH secundário: Animais
Feminino
Densidade Demográfica
Trifolium
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180221
[Lr] Data última revisão:
180221
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180105
[St] Status:MEDLINE
[do] DOI:10.1093/jisesa/iex100



página 1 de 875 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde