10 documents found, page 1 of 1
Pervasive gaps in Amazonian ecological research
Carvalho, Raquel L.; Resende, Angelica F.; Barlow, Jos; França, Filipe M.; Moura, Mario R.; Maciel, Rafaella; Alves-Martins, Fernanda; Shutt, JackBiodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain underst...
Hiding from defenders: Localized chemical modification on the leaves of an Amaz...
Izzo, Thiago Junqueira; Julião, Genimar Rebouças; Almada, Emmanuel Duarte; Fernandes, G. WilsonDefense against herbivores is considered the main factor influencing the evolution of specialized ant-plant associations. Early studies have demon strated that ants chemically recognize and recruit on host plant leaves due to herbivory simulation. Gall-forming insects are herbivores that are able to manipulate chemical plant properties and thus could change ant responses. The goal of this study was to evaluate ...
The influence of climatic parameters in the haematophagic daily activity of Cer...
Medeiros, Jansen Fernandes de; Py-Daniel, Victor; Izzo, Thiago JunqueiraFoi estudada a influência dos parâmetros climáticos na atividade hematofágica diária de Cerqueirellum argentiscutum durante setembro/1999 a agosto/2000. Foi observado que a atividade foi diferente conforme as estações (seca e chuvosa). A umidade e a temperatura foram os fatores que mais influenciaram na atividade em ambas as estações. Na estação seca foi maior no início da manhã apresentando uma associação posi...
Evidence for a stress hypothesis: hemiparasitism effect on the colonization of ...
Schwartz, Gustavo; Hanazaki, Natalia; Silva, Marivana B.; Izzo, Thiago Junqueira; Bejar, María E. P.; Mesquita, Mariana R.; Fernandes, G. WilsonPlantas estressadas geralmente são mais atacadas por insetos galhadores. Neste estudo investigamos a relação entre abundância populacional e a riqueza de espécies de insetos galhadores na árvore Alchornea castaneaefolia A. JUSS. (Euphorbiaceae), submetida ao estresse induzido pela hemiparasita Psittacanthus sp. (Loranthaceae) na Amazônia, Brasil. Galhos de A. castaneaefolia atacados pela hemiparasita foram mais...
Interaction Intimacy Affects Structure and Coevolutionary Dynamics in Mutualist...
Guimarães, Paulo Roberto V.; Rico-Gray, Víctor; Oliveira, Paulo S.; Izzo, Thiago Junqueira; Reis, Sérgio Furtado dos; Thompson, John N.The structure of mutualistic networks provides clues to processes shaping biodiversity [1-10]. Among them, interaction intimacy, the degree of biological association between partners, leads to differences in specialization patterns [4, 11] and might affect network organization [12]. Here, we investigated potential consequences of interaction intimacy for the structure and coevolution of mutualistic networks. Fr...
Reciprocal interference between ants and stingless bees attending the honeydew-...
Almeida-Neto, Mário; Izzo, Thiago Junqueira; Raimundo, Rafael Luís Galdini; Rossa-Feres, Denise de CerqueiraWe evaluated the reciprocal effects between foragers of the ants Camponotus crassus and of the stingless bees Trigona hyalinata on aggregations of the honeydew-producing treehopper Aetalion reticulatum. The interactions were observed in Bauhinia variegata (Caesalpiniaceae) and Mangifera indica (Anacardiaceae) trees. We recorded the presence/absence of each attendant species in homopteran aggregations to test if...
Experimental Plasmodium vivax infection of key Anopheles species from the Brazi...
Ríos-Velásquez, Cláudia María; Martins-Campos, Keillen M.; Simões, Rejane C.; Izzo, Thiago Junqueira; dos Santos, Emerson SoaresBackground: Anopheles darlingi is the major malaria vector in countries located in the Amazon region. Anopheles aquasalis and Anopheles albitarsis s.l. are also proven vectors in this region. Anopheles nuneztovari s.l. and Anopheles triannulatus s.l. were found infected with Plasmodium vivax; however, their status as vectors is not yet well defined. Knowledge of susceptibility of Amazon anopheline populations t...
Rapid assessment of fruit-color selection by birds using artificial fruits at l...
Arruda, Rafael; Rodrigues, Domingos de Jesus; Izzo, Thiago JunqueiraAtualmente o uso de massa de modelar tem sido amplamente utilizado para testar várias hipóteses ecológicas. O objetivo deste trabalho foi determinar se cores de frutos artificiais dispostos isoladamente nos ramos, ou em agregação, influenciaram a escolha das aves. Coletamos os dados em seis parcelas distribuídas homogeneamente em uma trilha de 3 km. Nós usamos desenho experimental pareado, de modo que todos os ...
Postponing the production of ant domatia as a strategy promoting an escape from...
Izzo, Thiago Junqueira; Piedade, Maria Teresa Fernandez; Dáttilo, Wesley F.C.Background and Aims: Even when adapted to flooding environments, the spatial distribution, growing strategies and anti-herbivore defences of plants face stressful conditions. Here we describe the effects of flooding on carbon allocation on growth, domatia and leaf production, and the herbivory on the myrmecophyte domatia-bearing Tococa coronata Benth. (Melastomataceae) growing along river banks in the Amazon re...
Asymmetric dispersal and colonization success of amazonian plant-ants queens
Bruna, Emilio M.; Izzo, Thiago Junqueira; Inouye, Brian D.; Uríarte, Ma?ia; Vasconcelos, Heraldo L.Background: The dispersal ability of queens is central to understanding ant life-history evolution, and plays a fundamental role in ant population and community dynamics, the maintenance of genetic diversity, and the spread of invasive ants. In tropical ecosystems, species from over 40 genera of ants establish colonies in the stems, hollow thorns, or leaf pouches of specialized plants. However, little is known ...