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https://www.readbyqxmd.com/read/29321872/relative-contribution-of-neutral-and-deterministic-processes-in-shaping-fruit-feeding-butterfly-assemblages-in-afrotropical-forests
#1
Kwaku Aduse-Poku, Freerk Molleman, William Oduro, Samuel K Oppong, David J Lohman, Rampal S Etienne
The unified neutral theory of biodiversity and biogeography has gained the status of a quantitative null model for explaining patterns in ecological (meta)communities. The theory assumes that individuals of trophically similar species are functionally equivalent. We empirically evaluate the relative contribution of neutral and deterministic processes in shaping fruit-feeding butterfly assemblages in three tropical forests in Africa, using both direct (confronting the neutral model with species abundance data) and indirect approaches (testing the predictions of neutral theory using data other than species abundance distributions)...
January 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29321871/leaf-trait-variations-associated-with-habitat-affinity-of-tropical-karst-tree-species
#2
Nalaka Geekiyanage, Uromi Manage Goodale, Kunfang Cao, Kaoru Kitajima
Karst hills, that is, jagged topography created by dissolution of limestone and other soluble rocks, are distributed extensively in tropical forest regions, including southern parts of China. They are characterized by a sharp mosaic of water and nutrient availability, from exposed hilltops with poor soil development to valleys with occasional flooding, to which trees show species-specific distributions. Here we report the relationship of leaf functional traits to habitat preference of tropical karst trees. We described leaf traits of 19 tropical tree species in a seasonal karst rainforest in Guangxi Province, China, 12 species in situ and 13 ex situ in a non-karst arboretum, which served as a common garden, with six species sampled in both...
January 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29321479/contrasting-patterns-of-leaf-trait-variation-among-and-within-species-during-tropical-dry-forest-succession-in-costa-rica
#3
Géraldine Derroire, Jennifer S Powers, Catherine M Hulshof, Luis E Cárdenas Varela, John R Healey
A coordinated response to environmental drivers amongst individual functional traits is central to the plant strategy concept. However, whether the trait co-ordination observed at the global scale occurs at other ecological scales (especially within species) remains an open question. Here, for sapling communities of two tropical dry forest types in Costa Rica, we show large differences amongst traits in the relative contribution of species turnover and intraspecific variation to their directional changes in response to environmental changes along a successional gradient...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29301702/altitudinal-distribution-of-two-sibling-species-of-the-drosophila-tripunctata-group-in-a-preserved-tropical-forest-and-their-male-sterility-thermal-thresholds
#4
Marcos Roberto Dias Batista, Felipe Bastos Rocha, Louis Bernard Klaczko
Variation of ecophysiological traits may help to explain geographic distribution patterns of Drosophila sibling species. Many traits in ectotherms have optimal performance within specific temperature ranges. Altitudinal gradients are potentially informative for characterizing differences of sibling species distributions. We collected two sibling species of the tripunctata group - Drosophila mediopunctata (MPT) and D. unipunctata (UNI) - at eight altitudes (ranging from 593 to 1185m above sea level) located at a continuous Atlantic Rainforest reserve in consecutive years (2009-2011), with two collections at the hot-rainy season and two at the cold-dry season...
January 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29299260/individual-size-variation-reduces-spatial-variation-in-abundance-of-tree-community-assemblage-not-of-tree-populations
#5
Hua-Feng Wang, Meng Xu
Research on individual trait variation has gained much attention because of its implication for ecosystem functions and community ecology. The effect of individual variation on population and community abundance (number of individuals) variation remains scarcely tested. Using two established ecological scaling laws (Taylor's law and abundance-size relationship), we derived a new scaling relationship between the individual size variation and spatial variation of abundance. Tested against multi-plot tree data from Diaoluo Mountain tropical forest in Hainan, China, the new scaling relationship showed that individual size variation reduced the spatial variation of community assemblage abundance, but not of taxon-specific population abundance...
December 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29281752/associations-among-arbuscular-mycorrhizal-fungi-and-seedlings-are-predicted-to-change-with-tree-successional-status
#6
Bachelot Benedicte, María Uriarte, Robert Muscarella, Jimena Forero-Montaña, Jill Thompson, Krista McGuire, Jess Zimmerman, Nathan G Swenson, James S Clark
Arbuscular mycorrhizal (AM) fungi in the soil may influence tropical tree dynamics and forest succession. The mechanisms are poorly understood, because the functional characteristics and abundances of tree species and AM fungi are likely to be codependent. We used generalized joint attribute modeling to evaluate if AM fungi are associated with three forest community metrics for a sub-tropical montane forest in Puerto Rico. The metrics chosen to reflect changes during forest succession are: the abundance of seedlings of different successional status, the amount of foliar damage on seedlings of different successional status, and community-weighted mean functional trait values (adult specific leaf area (SLA), adult wood density, and seed mass)...
December 27, 2017: Ecology
https://www.readbyqxmd.com/read/29228017/two-decades-of-climate-driving-the-dynamics-of-functional-and-taxonomic-diversity-of-a-tropical-small-mammal-community-in-western-mexico
#7
Edgard David Mason-Romo, Ariel A Farías, Gerardo Ceballos
Understanding the effects of global climate disruption on biodiversity is important to future conservation efforts. While taxonomic diversity is widely studied, functional diversity of plants, and recently animals, is receiving increasing attention. Most studies of mammals are short-term, focus on temperate habitats, and rely on traits described in the literature rather than generating traits from observations. Unlike previous studies, this long-term field study assessed the factors driving the functional and taxonomic diversity of small-mammal assemblages in dry tropical forests using both traits recorded from literature and a demographic database...
2017: PloS One
https://www.readbyqxmd.com/read/29222065/testing-the-monophyly-of-simaba-simaroubaceae-evidence-from-five-molecular-regions-and-morphology
#8
Marcelo Fernando Devecchi, William Wayt Thomas, Gregory M Plunkett, José Rubens Pirani
Generic circumscriptions in the mostly pantropical family Simaroubaceae are somewhat controversial. Simaba is the largest genus, currently defined as exclusively neotropical, with around 25 species of trees and shrubs, but both its limits and infrageneric classification have been a matter of discussion and divergence. Traditionally, species of the genus have been treated in three sections: Simaba sect. Tenuiflorae, S. sect. Floribundae and S. sect. Grandiflorae, but a phylogenetic analysis suggested that the latter two may not be monophyletic...
December 5, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/29211923/xylem-hydraulic-safety-and-construction-costs-determine-tropical-tree-growth
#9
Cleiton B Eller, Fernanda de V Barros, Paulo R L Bittencourt, Lucy Rowland, Maurizio Mencuccini, Rafael S Oliveira
Faster growth in tropical trees is usually associated with higher mortality rates, but the mechanisms underlying this relationship are poorly understood. In this study, we investigate how tree growth patterns are linked with environmental conditions and hydraulic traits, by monitoring the cambial growth of nine tropical cloud forest tree species coupled with numerical simulations using a optimization model. We find that fast-growing trees have lower xylem safety margins than slow-growing trees and this pattern is not necessarily linked to differences in stomatal behaviour or environmental conditions when growth occurs...
December 6, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/29211619/life-on-the-edge-a-comparative-study-of-ecophysiological-adaptations-of-frogs-to-tropical-semiarid-environments
#10
Catalina Cruz-Piedrahita, Carlos A Navas, Andrew J Crawford
A key goal of ecology and evolution is to understand the relative contributions of environment and history in determining the geographic distribution of organisms. For the Neotropical lowlands, where temperatures are similar across landscapes, we hypothesize that water balance may be a critical but understudied factor in determining the distribution of species. Amphibians are especially sensitive to variation in precipitation due to their permeable skin. Here we focused on lowland frogs of northwestern South America and investigated variation among 17 species in potentially important ecologically relevant performance variables related to water balance, testing for possible adaptations to semiarid conditions within species...
January 2018: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/29182967/the-relationships-between-leaf-economics-and-hydraulic-traits-of-woody-plants-depend-on-water-availability
#11
Qiulong Yin, Lei Wang, Maolin Lei, Han Dang, Jiaxin Quan, Tingting Tian, Yongfu Chai, Ming Yue
Leaf economics and hydraulic traits are simultaneously involved in the process of trading water for CO2, but the relationships between these two suites of traits remain ambiguous. Recently, Li et al. (2015) reported that leaf economics and hydraulic traits were decoupled in five tropical-subtropical forests in China. We tested the hypothesis that the relationships between economics and hydraulic traits may depend on water availability. We analysed five leaf economics traits, four hydraulic traits and anatomical structures of 47 woody species on the Loess Plateau with poor water availability and compared those data with Li et al...
November 25, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29155921/aridification-as-a-driver-of-biodiversity-a-case-study-for-the-cycad-genus-dioon-zamiaceae
#12
José Said Gutiérrez-Ortega, Takashi Yamamoto, Andrew P Vovides, Miguel Angel Pérez-Farrera, José F Martínez, Francisco Molina-Freaner, Yasuyuki Watano, Tadashi Kajita
Background and Aims: Aridification is considered a selective pressure that might have influenced plant diversification. It is suggested that plants adapted to aridity diversified during the Miocene, an epoch of global aridification (≈15 million years ago). However, evidence supporting diversification being a direct response to aridity is scarce, and multidisciplinary evidence, besides just phylogenetic estimations, is necessary to support the idea that aridification has driven diversification...
November 16, 2017: Annals of Botany
https://www.readbyqxmd.com/read/29155446/the-china-plant-trait-database-towards-a-comprehensive-regional-compilation-of-functional-traits-for-land-plants
#13
Han Wang, Sandy P Harrison, I Colin Prentice, Yanzheng Yang, Fan Bai, Henrique Furstenau Togashi, Meng Wang, Shuangxi Zhou, Jian Ni
Plant functional traits provide information about adaptations to climate and environmental conditions, and can be used to explore the existence of alternative plant strategies within ecosystems. Trait data are also increasingly being used to provide parameter estimates for vegetation models. Here we present a new database of plant functional traits from China. Most global climate and vegetation types can be found in China, and thus the database is relevant for global modelling. The China Plant Trait Database contains information on morphometric, physical, chemical and photosynthetic traits from 122 sites spanning the range from boreal to tropical, and from deserts and steppes through woodlands and forests, including montane vegetation...
November 20, 2017: Ecology
https://www.readbyqxmd.com/read/29137616/foraging-dispersion-of-ryukyu-flying-foxes-and-relationships-with-fig-abundance-in-east-asian-subtropical-island-forests
#14
Ya-Fu Lee, Yen-Min Kuo, Hsin-Yi Chang, Chi-Feng Tsai, Shigeyuki Baba
BACKGROUND: Figs are widely distributed key resources to many tropical-subtropical animals, and flying-foxes are major consumers and seed dispersers of figs. Bat-fig interrelationships, however, may vary among species differing in fruiting traits, i.e., bat- versus bird-dispersed figs. We examined Ryukyu flying-fox foraging dispersion and the relationships with tree species composition and fig abundance in forests of Iriomote Island. RESULTS: Bat foraging dispersion showed no spatial patterns with respect to different areas of the island, and was not explained by heterogeneity, density, or basal area (BA) of total trees, nor by relative density or BA of fruiting trees or total fruiting figs among sites...
November 14, 2017: BMC Ecology
https://www.readbyqxmd.com/read/29128984/taxonomic-resolution-and-functional-traits-in-the-analysis-of-tropical-oribatid-mite-assemblages
#15
Maria A Minor, Sergey G Ermilov, Alexei V Tiunov
We analysed species-level datasets representing Oribatida assemblages along a gradient of old-growth primary tropical forests, secondary forests, and plantation forests in Dong Nai Biosphere Reserve, Vietnam. We identified patterns in abundance, species richness and species assemblages of Oribatida, then applied taxonomic sufficiency approach to the datasets. Using three levels of higher-taxon aggregation, we evaluated whether aggregated datasets are useful in identifying ecological patterns, in comparison to species-level data...
November 11, 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29127217/adding-landscape-genetics-and-individual-traits-to-the-ecosystem-function-paradigm-reveals-the-importance-of-species-functional-breadth
#16
Antonio R Castilla, Nathaniel S Pope, Megan O'Connell, María F Rodriguez, Laurel Treviño, Alonso Santos, Shalene Jha
Animal pollination mediates both reproduction and gene flow for the majority of plant species across the globe. However, past functional studies have focused largely on seed production; although useful, this focus on seed set does not provide information regarding species-specific contributions to pollen-mediated gene flow. Here we quantify pollen dispersal for individual pollinator species across more than 690 ha of tropical forest. Specifically, we examine visitation, seed production, and pollen-dispersal ability for the entire pollinator community of a common tropical tree using a series of individual-based pollinator-exclusion experiments followed by molecular-based fractional paternity analyses...
November 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29117202/oil-palm-monoculture-induces-drastic-erosion-of-an-amazonian-forest-mammal-fauna
#17
Ana Cristina Mendes-Oliveira, Carlos A Peres, Paula Cristina R de A Maués, Geovana Linhares Oliveira, Ivo G B Mineiro, Susanne L Silva de Maria, Renata C S Lima
Oil palm monoculture comprises one of the most financially attractive land-use options in tropical forests, but cropland suitability overlaps the distribution of many highly threatened vertebrate species. We investigated how forest mammals respond to a landscape mosaic, including mature oil palm plantations and primary forest patches in Eastern Amazonia. Using both line-transect censuses (LTC) and camera-trapping (CT), we quantified the general patterns of mammal community structure and attempted to identify both species life-history traits and the environmental and spatial covariates that govern species intolerance to oil palm monoculture...
2017: PloS One
https://www.readbyqxmd.com/read/29078339/evolutionary-cascades-induced-by-large-frugivores
#18
Jedediah F Brodie
Large, fruit-eating vertebrates have been lost from many of the world's ecosystems. The ecological consequences of this defaunation can be severe, but the evolutionary consequences are nearly unknown because it remains unclear whether frugivores exert strong selection on fruit traits. I assessed the macroevolution of fruit traits in response to variation in the diversity and size of seed-dispersing vertebrates. Across the Indo-Malay Archipelago, many of the same plant lineages have been exposed to very different assemblages of seed-dispersing vertebrates...
November 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29049301/plant-dna-barcodes-and-assessment-of-phylogenetic-community-structure-of-a-tropical-mixed-dipterocarp-forest-in-brunei-darussalam-borneo
#19
Jacqueline Heckenhauer, Kamariah Abu Salim, Mark W Chase, Kyle G Dexter, R Toby Pennington, Sylvester Tan, Maria Ellen Kaye, Rosabelle Samuel
DNA barcoding is a fast and reliable tool to assess and monitor biodiversity and, via community phylogenetics, to investigate ecological and evolutionary processes that may be responsible for the community structure of forests. In this study, DNA barcodes for the two widely used plastid coding regions rbcL and matK are used to contribute to identification of morphologically undetermined individuals, as well as to investigate phylogenetic structure of tree communities in 70 subplots (10 × 10m) of a 25-ha forest-dynamics plot in Brunei (Borneo, Southeast Asia)...
2017: PloS One
https://www.readbyqxmd.com/read/29040576/to-everything-there-is-a-season-summer-to-winter-food-webs-and-the-functional-traits-of-keystone-species
#20
Murray M Humphries, Emily K Studd, Allyson K Menzies, Stan Boutin
From a trophic perspective, a seasonal increase in air temperature and photoperiod propagates as bottom-up pulse of primary production by plants, secondary production by herbivores, and tertiary production by carnivores. However, food web seasonality reflects not only abiotic variation in temperature and photoperiod, but also the composition of the biotic community and their functional responses to this variation. Some plants and animals-here referred to as seasonal specialists-decouple from food webs in winter through migration or various forms of metabolic arrest (e...
November 1, 2017: Integrative and Comparative Biology
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