Estimators of Fruit Abundance of Tropical Trees

Chapman, Colin A.; Chapman, Lauren J.; Wangham, Richard; Hunt, Kevin D.; Gebo, Daniel L.; Gardner, Leah

doi:10.2307/2389015

Cited by 410 publications

(255 citation statements)

References 11 publications

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“…Two indicators of nesting site quality were additionally measured: nest height and tree diameter. Nest height was taken from the ground to the bottom of the nest with a precision of 0.5 m. Nest tree diameter was measured at breast height 1.2 m above the ground to the nearest 1 mm, and was treated as an indicator of tree size (Chapman et al 1992). Despite the presence of deep watercourses and water pools where willow shrubs could not develop, the structure of the stand and tree density was fairly homogenous across the colony and availability of high nesting trees was not limited at the peripheries of the colony even late in the season.…”

Section: Methodsmentioning

confidence: 99%

Is it always beneficial to breed in the centre? Trade-offs in nest site selection within the colony of a tree-nesting waterbird

Minias

Kaczmarek

2013

J Ornithol

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In most of colonial avian species, central parts of the colonies offer higher safety in terms of predatory pressure. However, in heterogeneous habitats, nest sites of high physical quality are likely to offer effective protection against predators or adverse weather conditions regardless of their location within the colony. The aim of this paper was to investigate whether nest site selection in a treenesting waterbird, the Great Cormorant Phalacrocorax carbo sinensis, depends on the within-colony location of sites, their physical quality or a combination of these components. The study was conducted during 2010-2011 in a cormorant colony in central Poland. We found that early-breeding individuals preferred nest sites in the central parts of the colony and located high off the ground. The high quality of pairs nesting in these locations was confirmed with good body condition of nestlings, measured by their body masses and plasma concentrations of glucose and urea. A similar spatial pattern was found for the daily nest survival rate and reproductive success. It was found that the central nesting sites associated with high nesting densities were better protected against predators, while the physical quality of nesting sites determined the probability of nest collapse before the conclusion of breeding activities. The two-way process of assessing nest site attractiveness (nest site location vs. physical quality) suggests that, under the limitation of the most attractive nesting sites (good-quality central sites), tree-nesting waterbirds may trade central nesting locations for the high-quality sites at the peripheries of the colony.

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Section: Methodsmentioning

confidence: 99%

Is it always beneficial to breed in the centre? Trade-offs in nest site selection within the colony of a tree-nesting waterbird

Minias

Kaczmarek

2013

J Ornithol

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“…Trees with wide and more highly branched crowns promote greater seed abundance beneath them (McDonnell & Stiles 1983;Holl 1998;Cole et al 2010;Derroire et al 2016) and can serve as attractive environments for seed dispersers and will provide the immediate microclimate for seed germination and seedling growth (Belsky et al 1989;Callaway 2007;Derroire et al 2016). Trees with a larger diameters and hollows in their trunks are important for many bird species (Mazurek & Zielinski 2004), and trees with larger diameters have greater crown coverage and more branches, and will produce more flowers and seeds (Chapman et al 1992;Greene & Johnson 1994).…”

Section: Introductionmentioning

confidence: 99%

Isolated trees with high crown coverage and densities increase pasture seed rain

et al. 2016

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Pasture and crop lands restrict seed dispersal near remnant forest fragments, especially by restricting the movements of dispersal agents and limiting propagule dispersal. Some factors can improve seed dispersal in open areas, such as the presence of high numbers of isolated trees in close proximity to forest fragments. We sought to determine if: (i) the structural characteristics and (ii) densities of isolated trees in pasture lands, and (iii) their distances from the forest fragments, infl uence seed dispersal. We installed 18 seed traps in each of six pastures (total=108 traps) bordering forest fragments distributed over 6 distance classes from the forest edges (0, 5, 10, 20, 40 and 80 m). We determined the characteristics of the plants surrounding the traps. GLM and GLMer analyses were performed and the best model was selected by AIC. We collected 8162 seeds (4722 anemochorous, 3304 epizoochorous, 72 autochorous, and 64 endozoochorous) belonging to 26 species. Our results showed that plants with high crown coverage close to forest fragments and at high densities in the pastures increased seed dispersal. Th ese results may aid future restoration of pasture lands by improving seed dispersal in this harsh habitat and promoting better connectivity between forest fragments.

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“…Fruit and liana abundance tend to correlate positively with diameter at breast height (dbh) in the tropics (Chapman et al, 1992;Leighton and Leighton, 1982;Stevenson, 2001;Zurring et al, 1993), though the precise relationship between the variables is arguable (Ganzhorn et al, 1999;Janson and Chapman, 1999). Thus, correlations between densities of Cheirogaleus major and tree diameter may reflect edge-related variations in feeding ecology.…”

Section: Introductionmentioning

confidence: 99%