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Patrick A. Jansen – One of the best experts on this subject based on the ideXlab platform.

  • directed seed dispersal towards areas with low conspecific tree density by a scatter hoarding rodent
    Ecology Letters, 2012
    Co-Authors: Patrick A. Jansen, Ben T. Hirsch, Roland Kays, Veronica E Pereira

    Abstract:

    Scatter-hoarding animals spread out cached seeds to reduce density-dependent theft of their food reserves. This behaviour could lead to directed dispersal into areas with lower densities of conspecific trees, where seed and seedling survival are higher, and could profoundly affect the spatial structure of plant communities. We tested this hypothesis with Central American agoutis and Astrocaryum standleyanum palm seeds on Barro Colorado Island, Panama. We radio-tracked seeds as they were cached and re-cached by agoutis, calculated the density of adult Astrocaryum trees surrounding each cache, and tested whether the observed number of trees around seed caches declined more than expected under random dispersal. Seedling establishment success was negatively dependent on seed density, and agoutis carried seeds towards locations with lower conspecific tree densities, thus facilitating the escape of seeds from natural enemies. This behaviour may be a widespread mechanism leading to highly effective seed dispersal by scatter-hoarding animals.

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  • Directed seed dispersal towards areas with low conspecific tree density by a scatter‐hoarding rodent
    Ecology letters, 2012
    Co-Authors: Ben T. Hirsch, Roland Kays, Veronica E Pereira, Patrick A. Jansen

    Abstract:

    Scatter-hoarding animals spread out cached seeds to reduce density-dependent theft of their food reserves. This behaviour could lead to directed dispersal into areas with lower densities of conspecific trees, where seed and seedling survival are higher, and could profoundly affect the spatial structure of plant communities. We tested this hypothesis with Central American agoutis and Astrocaryum standleyanum palm seeds on Barro Colorado Island, Panama. We radio-tracked seeds as they were cached and re-cached by agoutis, calculated the density of adult Astrocaryum trees surrounding each cache, and tested whether the observed number of trees around seed caches declined more than expected under random dispersal. Seedling establishment success was negatively dependent on seed density, and agoutis carried seeds towards locations with lower conspecific tree densities, thus facilitating the escape of seeds from natural enemies. This behaviour may be a widespread mechanism leading to highly effective seed dispersal by scatter-hoarding animals.

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  • Effects of Food Availability on Space and Refuge Use by a Neotropical Scatterhoarding Rodent
    Biotropica, 2012
    Co-Authors: Willem-jan Emsens, Lennart Suselbeek, Ben T. Hirsch, Roland Kays, Annemarie J. S. Winkelhagen, Patrick A. Jansen

    Abstract:

    Animals that rely on refuges for safety can theoretically increase their foraging area without simultaneously increasing predation risk and travel costs by using more refuges. The key prediction of this theory, a negative correlation between food abundance, home range size and the number of refuges used, has never been empirically tested. We determined how home range size and refuge use by the Central American agouti (Dasyprocta punctata) varied across a gradient of abundance of the agoutis’ principal food source: seeds and fruits of the palm Astrocaryum standleyanum. We used both manual and automated radio telemetry to measure space use of 11 agoutis during 2 mo of the Astrocaryum fruiting season, and of another set of 10 agoutis during 6 mo in which the animals largely relied on cached Astrocaryum seeds. We found that agoutis living in areas of lower food density had larger home ranges, and that all individuals used multiple refuges. The number of refuges, however, was not correlated with home range size. Consequently, agoutis that had larger home ranges roamed farther from their refuges. These results suggest that agoutis increase their home range size in response to food scarcity at the cost of their safety.

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Matheus D. Baldissera – One of the best experts on this subject based on the ideXlab platform.

  • Treatment with tucumã oil (Astrocaryum vulgare) for diabetic mice prevents changes in seric enzymes of the purinergic system: Improvement of immune system.
    Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie, 2017
    Co-Authors: Matheus D. Baldissera, Michele Rorato Sagrillo, Carine F. Souza, Thirssa H. Grando, Aleksandro S. Da Silva, Pedro H. Doleski, Daniela B.r. Leal, Silvia Gonzalez Monteiro

    Abstract:

    Abstract The aim of this study was to evaluate the enzymatic activity of the purinergic system in sera samples from alloxan-induced diabetic mice treated with tucuma oil (Astrocaryum vulgare). For this, the mice were divided into four groups (n = 6): control/water (the group CW); control/tucuma oil (the group CT); diabetic/water (the group DW), and diabetic/tucuma oil (the group DT) treated for 14 days with 5.0 mL kg−1 via oral gavage. On day 14 post-treatment, mice were submitted to euthanasia and blood samples were collected by cardiac puncture. Tucuma oil treatment significantly decreased (p

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  • The use of tucumã oil (Astrocaryum vulgare) in alloxan-induced diabetic mice: effects on behavior, oxidant/antioxidant status, and enzymes involved in brain neurotransmission.
    Molecular and cellular biochemistry, 2017
    Co-Authors: Matheus D. Baldissera, Lenita M. Stefani, Carine F. Souza, Thirssa H. Grando, Aleksandro S. Da Silva, Michele R Sagrillo, Silvia G Monteiro

    Abstract:

    The aim of this study was to investigate the effects of tucumã oil (Astrocaryum vulgare) on memory, enzymatic activities of sodium-potassium pump (Na+, K+-ATPase) and acetylcholinesterase (AChE) in the brain of alloxan-induced diabetic mice. The animals were divided into four groups (n = 6 each): the group A (non-diabetic/water), the group B (non-diabetic/tucumã oil), the group C (diabetic/water), and the group D (diabetic/tucumã oil) treated 14 days with 5.0 mL kg-1 via oral gavage. Untreated diabetic mice (the group C) showed memory deficit, increased levels of thiobarbituric acid reactive species (TBARS) and protein carbonylation (PC), and decreased (p 

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  • Antihyperglycemic, antioxidant activities of tucumã oil (Astrocaryum vulgare) in alloxan-induced diabetic mice, and identification of fatty acid profile by gas chromatograph: New natural source to treat hyperglycemia
    Chemico-biological interactions, 2017
    Co-Authors: Matheus D. Baldissera, Kátia Nascimento, Michele Rorato Sagrillo, Ivana Beatrice Mânica Da Cruz, Carine F. Souza, Thirssa H. Grando, Luciana F. Cossetin, Aleksandro S. Da Silva, Alencar Machado, Lenita M. Stefani

    Abstract:

    Abstract The aim of the study was to investigate the effect of the oral administration of tucuma oil (Astrocaryum vulgare) on glucose and insulin levels, oxidative status, and pancreatic genotoxic parameters of alloxan-induced diabetic mice. The animals were divided into four groups (n = 6 each): control/water; control/tucuma oil; diabetic/water; diabetic/tucuma oil treated for 14 days with 5.0 mL kg−1 via oral gavage. Gas chromatograph characterization demonstrated that oleic/elaidic fatty acid is the most abundant component present in this oil, followed by palmitic and stearic fatty acids. Our results demonstrated an increase (p

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Betty Millan – One of the best experts on this subject based on the ideXlab platform.

  • variabilidad vegetativa intra e interespecifica de Astrocaryum chonta y a javarense arecaceae en jenaro herrera loreto peru
    Revista Peruana de Biología, 2014
    Co-Authors: Miguel Machahua, Francis Kahn, Betty Millan

    Abstract:

    Vegetative quantitative characters from adult, juvenile II, juvenile I and seedlings of Astrocaryum chonta and Astrocaryum javarense for four populations of Jenaro Herrera were analyzed in order to observe the patterns of vegetative variation at intra and interspecific level. The biometric data were analyzed using ANOVA (p<0.05 and 0.01). At intraspecific level the 37% and 64% of vegetative characters are significantly different in Astrocaryum chonta and Astrocaryum javarense, while at interspecific level the 81% are significantly different.

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  • Variabilidad vegetativa intra e interespecífica de Astrocaryum chonta y A. javarense (Arecaceae) en Jenaro Herrera, Loreto, Perú
    Revista Peruana de Biología, 2014
    Co-Authors: Miguel Machahua, Francis Kahn, Betty Millan

    Abstract:

    Vegetative quantitative characters from adult, juvenile II, juvenile I and seedlings of Astrocaryum chonta and Astrocaryum javarense for four populations of Jenaro Herrera were analyzed in order to observe the patterns of vegetative variation at intra and interspecific level. The biometric data were analyzed using ANOVA (p

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  • anatomia del fruto y perianto en especies peruanas del genero Astrocaryum arecaceae descripcion e importancia taxonomica
    Revista Peruana de Biología, 2014
    Co-Authors: Cecilia Vegas, Betty Millan, Jean-christophe Pintaud, Francis Kahn

    Abstract:

    The anatomy of fruit and perianth is described for 12 Peruvian species of the genus Astrocaryum. The fruit displays three well-defined layers: exocarp with fiber boundles and sclereids, free or grouped; mesocarp with parenchyma and schizogenous cavities; and heavily sclerified endocarp. Density of vascular bundles of the calyx is higher in the two species of subgenus Astrocaryum and lower in the ten species of subgenus Monogynanthus. Several structures exhibit useful characters for distinguishing subsections and species in the Huicungo section. Such characters include the form and location of fiber packages of the calyx, density of brachysclereids in the distal zone of the exocarp, form of vascular bundles of the corolla, raphides in the mesocarp, presence or absence of trichomes, structure of trichomes, presence or absence of laminar colenchyma in the exocarp, staminodial ring free or adnate and continuity with the corolla. An identification key based on these anatomical characters is supplied.

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