Consulta: subjectFacets:"Interspecific competition"
Registros recuperados: 17
Data/hora: 12/06/2024 00:59:57

Spatial relationships between Ananas ananassoides (Bromeliaceae) and Tachigali vulgaris (Fabaceae) influencing the structure of the Amazon/Cerrado transition in Brazil
Provedor de dados: 67
Autores: Elias,Fernando; Teixeira,Nayara D. A; Marimon Junior,Ben Hur.
In the present study, we tested the hypothesis that: a) bromeliad Ananas ananassoides individuals and Tachigali vulgaris tree individual have an aggregate distribution pattern, and b) are spatially dissociated. To this effect, we quantified all A. ananassoides and T. vulgaris individuals (DBH of at least 30 cm) in large plot (1 ha) composed by 100 subplots measuring 10×10 m in a savanna woodland in the Bacaba Municipal Park, Nova Xavantina, Mato Grosso. The spatial pattern of A. ananassoides and T. vulgaris, and their spatial relationships, were measured using the aggregation and the association index, respectively. Both species had an aggregate distribution pattern and were spatially dissociated, which corroborates the hypotheses of this study. In this...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Interspecific competition; Spatial dynamics; Gaps; Environmental heterogeneity; Competição interespecífica; Dinâmica espacial; Clareiras; Heterogeneidade ambiental.
Ano: 2017
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2017000300010

Corn production for silage intercropped with forage in the farming-cattle breeding integration
Provedor de dados: 70
Autores: Mendonça,Veridiana Z. de; Mello,Luiz M. M. de; Pereira,Francisco C. B. L.; Silva,José O. da R.; Yano,Élcio H.
Corn cropping for silage, due to the plant material exportation, intercropping with forage provides greater ground cover and straw formation for the Direct Planting System (DPS) continuity. The objective of this study was to evaluate corn production for silage in DPS intercropped with four forages (Urochloa brizantha cv. Marandu, U. ruziziensis cv. Ruziziensis, Panicum maximum cv. Tanzânia and P. maximum cv. Áries). We applied three sowing methods (in row together with corn fertilizer; by no-till sowing simultaneously to corn sowing and at V4 corn stage) and corn without intercropping. The experiment was conducted in autumn/ winter of 2010, in Selvíria - MS, in a randomized block design in factorial arrangement (4 x 3 + 1) and 4 replications. For corn, we...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Direct sowing; Interspecific competition; Sowing mode; Mulching.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000400013

Emergence of a new predator in the North Sea: evaluation of potential trophic impacts focused on hake, saithe, and Norway pout
Provedor de dados: 5
Autores: Cormon, Xochitl; Kempf, Alexander; Vermard, Youen; Vinther, Morten; Marchal, Paul.
During the last 15 years, northern European hake (Merluccius merluccius) has increased in abundance, and its spatial distribution has expanded in the North Sea region in correlation with temperature. In a context of global warming, this spatial shift could impact local trophic interactions: direct impacts may affect forage fish through modified predator–prey interactions, and indirect impacts may materialize through competition with other resident predators. For instance, North Sea saithe (Pollachius virens) spatial overlap with hake has increased while saithe spawning-stock biomass has decreased recently notwithstanding a sustainable exploitation. In this context, we investigated the range of potential impacts resulting from most recent hake emergence in...
Tipo: Text
Palavras-chave: Hake; Interspecific competition; Maximum sustainable yield; Multispecies stock assessment; Norway pout; Predator-prey interactions; Saithe; Simple foodweb; SMS.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00327/43794/45917.pdf

Invasion of the eastern Bay of Biscay by the nassariid gastropod Cyclope neritea: origin and effects on resident fauna
Provedor de dados: 5
Autores: Bachelet, G; Simon-bouhet, B; Desclaux, C; Garcia-meunier, P; Mairesse, G; De Montaudouin, X; Raigne, H; Randriambao, K; Sauriau, Pierre-guy; Viard, F.
The distribution area of the nassariid gastropod Cyclope neritea (L.) includes the Mediterranean and the Black Sea, as well as the Atlantic coasts of the southern Iberian Peninsula. The species has spread north to the eastern Bay of Biscay (Arcachon Bay in 1976, Marennes-Oleron area and Morbihan Gulf in 1983-84). This spread might be explained either by (1) a natural spread favoured by environmental changes (e.g. an increase of temperature) or (2) a sudden range expansion due to the introduction of individuals from distant native populations. Molecular genetic analyses based on mitochondrial markers suggest that the present C. neritea population in Arcachon Bay has been introduced, probably unintentionally with oyster transfers, from several source...
Tipo: Text
Palavras-chave: Introduced species; Scavenging gastropods; Population genetics; Interspecific competition; Behaviour parasites.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00000/10848/7582.pdf

Role of behaviour in biological invasions and species distributions; lessons from interactions between the invasive Gammarus pulex and the native G. duebeni (Crustacea: Amphipoda)
Provedor de dados: 16
Autores: Dick, J.T.A.
In attempting to understand the distributions of both introduced species and the native species on which they impact, there is a growing trend to integrate studies of behaviour with more traditional life history/ecological approaches. The question of what mechanisms drive the displacement of the freshwater amphipod Gammarus duebeni by the often introduced G. pulex is presented as a case study. Patterns of displacement are well documented throughout Europe, but the speed and direction of displacement between these species can be varied. From early studies proposing interspecific competition as causal in these patterns, I review research progress to date. I show there has been no evidence for interspecific competition operating, other than the field patterns...
Tipo: Article / Letter to the editor
Palavras-chave: Amphipods; Animal behaviour; Gammarus; Interspecific competition; Intraguild predation; Invasive species; Species distributions; 42.74.
Ano: 2008
URL: http://www.repository.naturalis.nl/record/280476

Nest site use by the small Japanese field mouse: possibility of nest height change in the presence of the Siberian flying squirrel
Provedor de dados: 19
Autores: 鈴木, 圭; 山根, 大; 柳川, 久; YANAGAWA, Hisashi.
同所的に生息し，類似した生態的特徴を持つ種同士は，他種との資源競争を避けるために，その資源に対する選択性を変化させることがある．本研究では，資源競争回避のメカニズムを解明するための基礎的情報を収集するために，樹洞を繁殖場所とするヒメネズミApodemus argenteusを対象として，タイリクモモンガPteromys volansとの営巣資源をめぐる競争回避のための選択性の変化を調べた．本研究では，タイリクモモンガの影響を受けない条件下と受ける条件下においてヒメネズミの営巣高を比較した．ヒメネズミは，タイリクモモンガの入れない入口径が小さい巣箱では低い位置から高い位置まで様々な高さに営巣した．それに対し，タイリクモモンガが入ることができる入口径が大きい巣箱では，一貫して低い位置に設置された巣箱に営巣した．一般的に低い樹洞は，クロテンMartes zibellinaやアカギツネVulpes vulpesなど地上からくる捕食者に捕食される危険性が高い．加えて，入口径が大きい樹洞はより多くの種類の捕食者の侵入が可能であるため，捕食圧が高くなると考えられ，入口径が大きい巣箱で，ヒメネズミが好んで低い位置に営巣しているとは考え難い．本研究の結果は，ヒメネズミがタイリクモモンガとの営巣資源競争を避けるために，営巣場所の高さを変化させる可能性があることを示すものである．
Palavras-chave: Apodemus argenteus; Cavity; Interspecific competition; Nesting resource; Small Japanese field mouse.
Ano: 2014
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4113

Corn yield, forage production and quality affected by methods of intercropping corn and Panicum maximum
Provedor de dados: 86
Autores: Almeida,Rodrigo Estevam Munhoz de; Gomes,Caio Macret; Lago,Bruno Cocco; Oliveira,Silas Maciel de; Pierozan Junior,Clovis; Favarin,José Laércio.
Abstract: The objective of this work was to evaluate methods of intercropping corn and Panicum spp. forages and their effects on corn yield and forage development. Two experiments with Panicum spp. were conducted, one with 'Tanzania' and other with 'Massai' in the municipality of Piracicaba, in the state of São Paulo, Brazil, in the 2012/2013 growing season. In both experiments, the treatments were: broadcast seeding of Panicum spp. at the same time of corn sowing; corn with Panicum spp. between rows; Panicum spp. sown with fertilizer; Panicum spp. sown between corn rows after corn establishment; broadcast seeding of Panicum spp. after corn establishment; and sole corn sowing. For corn, leaf nitrogen content, ear height, and grain yield were evaluated. For...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Guinea grass; Interspecific competition; Tropical perennial grass.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000300170

Reflectance indices as a diagnostic tool for weed control performed by multipurpose equipment in precision agriculture
Provedor de dados: 87
Autores: Merotto JR.,A.; Bredemeier,C.; Vidal,R.A.; Goulart,I.C.G.R.; Bortoli,E.D.; Anderson,N.L.
Several tools of precision agriculture have been developed for specific uses. However, this specificity may hinder the implementation of precision agriculture due to an increasing in costs and operational complexity. The use of vegetation index sensors which are traditionally developed for crop fertilization, for site-specific weed management can provide multiple utilizations of these sensors and result in the optimization of precision agriculture. The aim of this study was to evaluate the relationship between reflectance indices of weeds obtained by the GreenSeekerTM sensor and conventional parameters used for weed interference quantification. Two experiments were conducted with soybean and corn by establishing a gradient of weed interference through the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GreenSeekerTM; Interspecific competition; Corn; NDVI; Red/NIR; Soybean.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000200024

Interference Between Signal Grass and Cinderella Weed
Provedor de dados: 87
Autores: MARTINS,P.F.R.B.; YAMAUTI,M.S.; ALVES,P.L.C.A.
ABSTRACT: The aim in this work was to evaluate the coexistence of Urochloa decumbens (signal grass) and Synedrellopsis grisebachii (Cinderella weed) in a replacement series experiment. To find the critical population density, 1, 2, 4, 8, 16, 24 and 32 plants were planted in the same box, harvested after 40 days, dried and weighted, and analyzed through regression analysis. The replacement series experiment used density percentages for signal grass and Cinderella weed of 100:0, 75:25, 50:50, 25:75 and 0:100. The aboveground parts were harvested, dried and analyzed through qualitative and quantitative measures. Sixteen plants per box were needed for the signal grass to achieve the critical population. Qualitative analysis showed mutual harm to the dry matter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Replacement series experiment; Interspecific competition; Intraspecific competition ecological indexes; Urochloa decumbens; Synedrellopsis grisebachii.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100281

Interference of Broadleaf Buttonweed and White-Eye in Soybean
Provedor de dados: 87
Autores: DIESEL,F.; TREZZI,M.M.; GALLON,M.; MIZERSKI,P.H.F.; BATISTEL,S.C.; PAGNONCELLI,F.B.
ABSTRACT: Weed species is one of the factors contributing to grain yield losses due to crop-weed competition. Two of the most common weeds of soybean fields in Brazil are from the Rubiaceae family: Borreria latifolia and Richardia brasiliensis. This study aimed to evaluate the effects of B. latifolia and R. brasiliensis on plant development, yield components, and soybean productivity. Two assays were conducted in a randomized block design with four replications, using a two-level factorial design, in which the first factor consisted of the species B. latifolia and R. brasiliensis and the second factor consisted of the densities 0, 2, 4, 6, 8, 10, and 12 plants m-2. Plant height, leaf area and total chlorophyll in the V6 and R5 stages, number of pods per...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interspecific competition; Glycine max; Richardia brasiliensis; Borreria latifolia; Density.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100222

Land Conversion, Interspecific Competition, and Bioinvasion in a Tropical Ecosystem
Provedor de dados: 31
Autores: Barbier,   Edward B.
This paper investigates the relationships among land-use change, biological invasion, and interspecific competition in a tropical ecosystem by linking a behavioral model of land conversion by agriculture and an ecological model of interspecific competition between a native species and an exotic invader.  The model is used to examine how relative farm prices and access to forest areas influence land clearing and thus the ability of the invasive species to eliminate the native species.  Simulations show that only a 20% rise in relative prices and a 2.75% increase in forest access are necessary for this outcome to occur.
Tipo: Journal Article
Palavras-chave: Biological invasion; Interspecific competition; Land clearing; Tropical ecosystem; Tropical forest; O13; Q20; Q24.
Ano: 2007
URL: http://purl.umn.edu/37275

Residence advantage in heterospecific territorial disputes of Erythrodiplax Brauer species (Odonata, Libellulidae)
Provedor de dados: 92
Autores: Resende,Daniela Chaves.
Residence advantage in heterospecific territorial disputes of Erythrodiplax Brauer species (Odonata, Libellulidae). Territories are the outcome of interactions determining where and how long individuals settle. To odonate species, aggressive disputes are not so common since the outcome can be predetermined by advantages such as residency, age, and body size. However, it is possible to predict that at heterospecific disputes, larger body-sized or more aggressive species have some profits overcoming these individual advantages, generating patterns of species hierarchy. Here, I studied the aggressiveness of five Erythrodiplax species (Odonata, Libellulidae) during territorial disputes and verified if larger body-sized species are more aggressive than smaller...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asymmetry; Hierarchy; Interspecific competition; Territoriality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000100014

Habitat use by Callicebus coimbrai (Primates: Pitheciidae) and sympatric species in the fragmented landscape of the Atlantic Forest of southern Sergipe, Brazil
Provedor de dados: 103
Autores: Chagas,Renata Rocha Déda; Ferrari,Stephen F.
Anthropogenic habitat fragmentation is a chronic problem throughout the Brazilian Atlantic Forest biome. In the present study, four forest fragments of 60-120 ha were surveyed on a rural property in southern Sergipe, where two endangered primate species, Callicebus coimbrai Kobayashi &amp;amp; Langguth, 1999 and Cebus xanthosternos Wied-Neuwied, 1826, are found. Two transects were established in each fragment, and the predominant habitat in 50 m sectors was assigned to one of three categories (mature forest, secondary forest and anthropogenic forest). Standard line transect surveys of the resident primate populations - which included a third species, Callitrhix jacchus Linnaeus, 1758 - were conducted, with a total of 476 km walked transect, resulting in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Callithrix jacchus; Cebus xanthosternos; Interspecific competition; Niche partitioning.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000600003

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

Oat grain yield under nitrogen uses in an eucalyptus intercropping system in Subtropical Brazil
Provedor de dados: 124
Autores: Deiss,Leonardo; Moraes,Anibal de; Pelissari,Adelino; Silva,Vanderley Porfírio da; Andreolla,Veruschka Rocha Medeiros.
ABSTRACT Agronomic practices adequacy plays a key role in the integrated crop-livestock systems development. The objective of this study was to determine how the phytomass accumulation, yield compounds and oat (Avena sativa L. cv. IPR 126) yield were influenced by nitrogen levels (12 and 80 kg N ha-1) at five equidistant positions between two adjacent eucalyptus (Eucalyptus dunnii Maiden) double line tracks [20 m (4 m x 3 m)] in intercropping system (IS) and traditional no-till agriculture (without trees) in subtropical Brazil. The experiment was conducted in a split-block in a randomized block design with four replicates. At the end of the oat cycle, there was compensation for the lower spikelets per panicle number by the greater grain per spikelet...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilization; Interspecific competition; Lodging; Small cereal.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000300462

EXPERIMENTAL APPROACHES FOR THE EVALUATION OF ALLELOPATHIC INTERACTIONS BETWEEN HERMATYPIC CORALS AND MARINE BENTHIC CYANOBACTERIA IN THE COLOMBIAN CARIBBEAN
Provedor de dados: 37
Autores: PUYANA,Mónica; PRATO,Julián Alberto; NIETO,Christian Felipe; RAMOS,Freddy Alejandro; CASTELLANOS,Leonardo; PINZÓN,Paola; ZÁRATE,Juan Camilo.
ABSTRACT Blooms of marine benthic cyanobacteria are recurrent in several locations at the Colombian Caribbean. In these events, cyanobacteria grow over the substrate and benthic organisms although their effect has not been fully assessed. This study evaluated interactions between cyanobacteria and hermatypic corals, in order to identify any deleterious effects that could be related to allelopathic mechanisms. Organic extracts from cyanobacteria collected in San Andres, Old Providence and Rosario islands were tested against embryos of the reef-building coral Orbicella annularis. The indirect effect of cyanobacterial extracts was also assessed by resuspending the extracts in seawater and monitoring polyp retraction and recovery of the coral Madracis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alellopathy; Corals; Cyanobacteria; Interspecific competition.
Ano: 2019
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2019000200243

Morning glory species interference on the development and yield of soybeans
Provedor de dados: 53
Autores: Pagnoncelli,Fortunato De Bortoli; Trezzi,Michelangelo Muzell; Brum,Betania; Vidal,Ribas Antonio; Portes,Álvaro Fernando; Scalcon,Everton Luiz; Machado,Adriano.
ABSTRACT Plants from the genus ipomoea are among the most important weeds in Brazil. The objective of this study was to determine the impact of different densities of 2 species of Ipomoea (I. grandifolia and I. purpurea) under different environments (counties of Pato Branco and Renascença, Paraná state, Brazil) on soybean biometric variables, yield components and crop yield loss. Field experiments in 2 distinct places were conducted in a randomized block design, where 1 factor consisted of 8 plant densities (0, 2, 4, 6, 8, 10, 15 and 20 plants∙m−2), whereas the other factor consisted of the 2 Ipomoea species. Joint analysis of the data was performed considering the factors environment, Ipomoea densities and species. The impact of one Ipomoea plant∙m−2 was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interspecific competition; Ipomoea spp.; Glycine max; Biometric variables; Yield components.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400470