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6 resultados encontrados para: AUTOR: de Boer, Willem Frederik
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- Artículo con arbitraje
Resumen en: Inglés |
Resumen en inglés

Species can co-exist within a community when their use of limiting resources is differentiated. To test whether differentiation facilitates coexistence, we quantified differences and overlap in habitat use, fruit consumption, morphological characteristics, and the relationship with vegetation structure for two pairs of ecologically similar frugivorous bat species, Carollia sowelli and C. perspicillata, and Artibeus jamaicensis and A. lituratus. In Carollia sowelli and C. perspicillata, differences in body mass and wing aspect ratio were not reflected in differences in fruit or habitat use (diet overlap, 96 percent; habitat overlap, 98 percent). However, the capture rate of Carollia sowelli positively correlated with canopy openness, and that of C. perspicillata positively correlated with tree height. Body mass and wing characteristics of Artibeus species suggested a greater maneuverability for A. jamaicensis. Also, more A. jamaicensis individuals were captured feeding on Ficus spp., while Artibeus lituratus preferred fruits of the early successional tree Cecropia. However, both habitat overlap and diet overlap were higher than by chance (diet overlap, 75 percent; habitat overlap, 92 percent). The co-existence of the four bat species in the study area may be facilitated by the abundance of the food resources forming part of the diets of both Carollia species, by the morphological differences between the Artibeus species, which allow the differentiation of foraging behavior in relation to fruit consumption, and by the structural characteristics of the vegetation.

- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Positive effects of surrounding rainforest on composition, diversity and late-successional seed dispersal by bats
Vleut, Ivar Joeri Joannes ; Levy Tacher, Samuel Israel (coaut.) ; Galindo González, Jorge (coaut.) ; de Boer, Willem Frederik (coaut.) ;
Contenido en: Basic and Applied Ecology Vol. 16, no. 4 (June 2015), p. 308–315 ISSN: 1439-1791
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

The configuration of a heterogeneous landscape has an important effect on species composition and landscape processes. The importance of the size, shape and habitat suitability of forest patches has been widely studied, but there is increasing evidence that the spatial context, e.g. adjacency or contact between two landscape elements, can have positive effects on ecological interactions, such as the movement of frugivorous bat species and seed dispersal. We compared the composition, diversity and richness of seed species transported by bats in rainforests and in secondary forests that were either partially or largely surrounded by rainforest, in relation to the fruit species’ life form and successional stage. To capture frugivorous bats we used mist nets with a plastic sheet placed below to allow dropped fruit and seeds from bat feces to be retrieved. Similar species composition and the highest diversity of transported seeds were found in rainforest and secondary forest largely surrounded by rainforest, while the highest number of seed species was recorded in rainforest and secondary forest partially surrounded by rainforest. More bats were captured transporting late-successional stage seeds in secondary forest largely surrounded by rainforest. This study demonstrates the importance of rainforest surrounding secondary forests to bat species’ movement and its positive effect on diversity and late-successional seed dispersal by bats. Maintaining large areas of rainforest around secondary forests is a useful management strategy for supporting high bat species diversity and abundance, and positively affects the transportation and potential dispersal of seed species of different successional stages.

- Artículo con arbitraje
*En hemeroteca, SIBE-San Cristóbal
Can a fast-growing early-successional tree (Ochroma pyramidale, Malvaceae) accelerate forest succession?
Vleut, Ivar Joeri Joannes ; Levy Tacher, Samuel Israel (coaut.) ; de Boer, Willem Frederik (coaut.) ; Galindo González, Jorge (coaut.) ; Ramírez Marcial, Neptalí (coaut.) (1963-) ;
Contenido en: Journal of Tropical Ecology Vol. 29, no. 2 (March 2013), p. 173-180 ISSN: 0266-4674
Bibliotecas: San Cristóbal
SIBE San Cristóbal
52555-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
Resumen en: Inglés |
Resumen en inglés

Species-specific traits of trees affect ecosystem dynamics, defining forest structure and understorey development. Ochroma pyramidale is a fast-growing tree species, with life-history traits that include low wood density, short-lived large leaves and a narrow open thin crown. We evaluated forest succession in O. pyramidale-dominated secondary forests, diverse secondary forests, both 10–15 y since abandonment, and rain forests by comparing height, density and basal area of all trees (> 5 cm dbh). Furthermore, we compared species richness of understorey trees and shrubs, and basal area and density of trees of early- and late-successional species (< 5 cm dbh) between forest types. We found that tree basal area (mean ± SD: 32 ± 0.9 m2 ha−1) and height (12.4 ± 1.8 m) of canopy trees were higher, and density (1450 ± 339 ha−1) lower in O. pyramidale forests than in diverse forests, and more similar to rain forest. Understorey shrub diversity and tree seedling density and diversity were lower in O. pyramidale forests than in diverse forests, but these forest types had a similar density of early- and late-successional trees. Canopy openness (> 15%) and leaf litter (> 10 cm) were both highest in O. pyramidale forests, which positively affected density of understorey trees and shrubs and negatively affected density of late-successional trees. In conclusion, O. pyramidale forests presented structural features similar to those of rain forest, but this constrained the establishment of understorey tree species, especially late-successional species, decreasing successional development.

- Artículo con arbitraje
Resumen en: Inglés |
Resumen en inglés

Most studies on frugivorous bat assemblages in secondary forests have concentrated on differences among successional stages, and have disregarded the effect of forest management. Secondary forest management practices alter the vegetation structure and fruit availability, important factors associated with differences in frugivorous bat assemblage structure, and fruit consumption and can therefore modify forest succession. Our objective was to elucidate factors (forest structural variables and fruit availability) determining bat diversity, abundance, composition and species-specific abundance of bats in (i) secondary forests managed by Lacandon farmers dominated by Ochroma pyramidale, in (ii) secondary forests without management, and in (iii) mature rain forests in Chiapas, Southern Mexico. Frugivorous bat species diversity (Shannon H’) was similar between forest types. However, bat abundance was highest in rain forest and O. pyramidale forests. Bat species composition was different among forest types with more Carollia sowelli and Sturnira lilium captures in O. pyramidale forests. Overall, bat fruit consumption was dominated by early-successional shrubs, highest late-successional fruit consumption was found in rain forests and more bats consumed early-successional shrub fruits in O. pyramidale forests. Ochroma pyramidale forests presented a higher canopy openness, tree height, lower tree density and diversity of fruit than secondary forests. Tree density and canopy openness were negatively correlated with bat species diversity and bat abundance, but bat abundance increased with fruit abundance and tree height. Hence, secondary forest management alters forests’ structural characteristics and resource availability, and shapes the frugivorous bat community structure, and thereby the fruit consumption by bats.

- Artículo con arbitraje
*En hemeroteca, SIBE-Chetumal
Tropical rain-forest matrix quality affects bat assemblage structure in secondary forest patches
Vleut, Ivar Joeri Joannes ; Levy Tacher, Samuel Israel (coaut.) ; Galindo González, Jorge (coaut.) ; de Boer, Willem Frederik (coaut.) ; Ramírez Marcial, Neptalí (coaut.) (1963-) ;
Contenido en: Journal of Mammalogy Vol. 93, no. 6 (2012), p. 1469-1479 ISSN: 0022-2372
Bibliotecas: Chetumal
SIBE Chetumal
37395-20 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Chetumal
Resumen en español

Estudiamos el ensamble de murciélagos de la familia Phyllostomidae en parches de vegetación secundaria dominada por árboles pioneros de Ochroma pyramidale (Malvaceae) en dos condiciones de vegetación circundante, aquellos mayormente rodeados por una matriz de bosque tropical (>85%), y los rodeados parcialmente (<35%). Se testearon 3 hipótesis: la matriz de bosque tropical que rodea parches de vegetación secundaria presenta una mayor diversidad y riqueza de murciélagos en comparación con la vegetación secundaria; la proporción de bosque tropical que rodea a la vegetación secundaria favorece la diversidad, riqueza y abundancia de murciélagos sensibles al disturbio; y el incremento en la apertura del dosel disminuye la abundancia de murciélagos. Los sitios de control de bosque tropical, presentaron la mayor diversidad y riqueza de murciélagos y contribuyeron mayormente a la diversidad total. En los parches de vegetación secundaria mayormente rodeados de bosque tropical se encontró que la diversidad de murciélagos fue similar a las áreas de control de bosque tropical. Sin embargo, los parches de vegetación secundaria mayormente rodeados por bosque tropical presentaron mayor diversidad y riqueza de murciélagos y contribuyeron a la diversidad total en comparación con parches de vegetación secundaria parcialmente rodeados por bosque tropical.

Los parches de vegetación secundaria parcialmente rodeados por bosque tropical, estuvieron dominados por 2 especies murciélagos frugívoros pequeños característicos de la vegetación secundaria (Carollia sowelli y Carollia perspicillata) mientras que los parches mayormente rodeados por bosque estuvieron dominados por 2 especies de murciélagos frugívoros grandes (Artibeus lituratus y Artibeus jamaicensis), típicos de vegetación madura que se alimentan principalmente de higos (Ficus spp.), un árbol abundante del bosque tropical. La diversidad, riqueza y la contribución total a la diversidad estuvieron correlacionadas positivamente con la proporción de bosque tropical, mientras que la abundancia de murciélagos fue negativamente correlacionada con la apertura de dosel.

Resumen en inglés

We studied Phyllostomidae bat assemblage structure in patches of secondary forest dominated by the pioneer tree Ochroma pyramidale, largely (>85%) or partially (<35%) surrounded by a matrix of tropical rain forest, to test 3 hypotheses: the highest bat diversity and richness is observed in the matrix rain forest in comparison to secondary forest patches; the proportion of rain forest surrounding secondary forest positively affects bat diversity and richness; and canopy openness is an important structural variable negatively affecting bat abundance. Rain-forest control sites had the highest bat species diversity and richness, and contributed more to total diversity than did secondary forest. Bat diversity was similar between secondary forest patches largely enclosed by rain forest and their controls, but higher diversity, richness, and contribution to total diversity were recorded in largely enclosed patches compared to partially enclosed patches. Partially enclosed patches were dominated by 2 small, frugivorous understory bat species (Carollia sowelli and Carollia perspicillata), whereas largely enclosed patches were dominated by 2 large-bodied, canopy-dwelling, frugivorous bats (Artibeus lituratus and Artibeus jamaicensis), which primarily feed on figs, a tree species that is abundant in rain forest. Bat diversity, richness, and contribution to total diversity were positively correlated with the proportion of area with rain forest, and bat abundance was negatively correlated with canopy openness.

Influence of body size on coexistence of bird species
Leyequién Abarca, Eurídice ; de Boer, Willem Frederik (coaut.) ; Cleef, Antoine M. (coaut.) ;
Contenido en: Ecological Research Vol. 22, no. 5 (2007), p. 735-741
Resumen en: Inglés |
Resumen en inglés

Theory suggests that body size is an important factor in determining interspecific competition and, ultimately, in structuring ecological communities. However, there is a lack of pragmatic studies linking body size and interspecific competition to patterns in ecological communities. The objective of the present study was to determine the effect of body size (mass) on competitive interactions between bird pairs and to investigate the influence of food guilds. Point-counts were carried out in nine sites every month from November 2002 to November 2003 in the Cuetzalan Region, Mexico, and we used presence/absence and abundance data for the analyses. To calculate the strength of competition we used the Angle Frequency Method to extract form factors from 20 pairwise interactions. A prototype competition interaction and random pairs were also constructed. We used clustering techniques (PCA) to calculate the dissimilarity scores (distances, D) of each of the pairwise interactions to the prototype competition and random pairs and one-way ANOVA to test for differences between the means of the random and competitive pairs.

The ratio in body mass (lnBM) for each of the interacting pairs was calculated, and the association between the lnBM ratio and the strength of competition (D) was tested using a Pearson product-moment correlation coefficient. To test for the influence of foraging guilds we used a univariate general linear model. Our results demonstrate a significant negative relationship between bird body mass ratio and competition strength – i.e. competition strength increased when the body masses of the birds became more similar. We did not find a significant influence of foraging guild on the relationship between body mass ratio and competition strength. On the basis of these results, we suggest that high variation in body sizes amongst sympatric species promotes coexistence in communities.