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https://www.readbyqxmd.com/read/28516322/do-functional-diversity-and-trait-dominance-determine-carbon-storage-in-an-altered-tropical-landscape
#1
Achim Häger, Gerardo Avalos
Altered landscapes play a major role in biodiversity conservation and carbon (C) storage in the tropics. There is increasing evidence that C storage potential is controlled by tree functional diversity, but underlying mechanisms are debated. We analyzed the effects of trait dominance (mass-ratio hypothesis), species diversity, and trait variation (species complementarity) on C storage in the soils and vegetation of 20 agroforestry systems (AFS) and seven forested sites in Costa Rica. AFS consisted of organic and conventional coffee farms and pastures with trees...
May 17, 2017: Oecologia
https://www.readbyqxmd.com/read/28504834/resource-stoichiometry-and-availability-modulate-species-richness-and-biomass-of-tropical-litter-macro-invertebrates
#2
Malte Jochum, Andrew D Barnes, Patrick Weigelt, David Ott, Katja Rembold, Achmad Farajallah, Ulrich Brose
1. The high biodiversity and biomass of soil communities is crucial for litter decomposition in terrestrial ecosystems such as tropical forests. However, the leaf litter that these communities consume is of particularly poor quality as indicated by elemental stoichiometry. The impact of resource quantity, quality, and other habitat parameters on species richness and biomass of consumer communities is often studied in isolation, although much can be learned from simultaneously studying both community characteristics...
May 15, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28449375/the-genetic-dimension-of-pest-pressure-in-the-tropical-rainforest
#3
Marco Todesco, Quentin Cronk
Wet tropical forests are among the most diverse ecosystems on Earth and can host several hundreds of tree species per hectare. To maintain such diversity, the community must contain large numbers of relatively rare species rather than be dominated by a few very common trees, as is often the case in temperate forests. Explaining the mechanisms preventing dominance by common species has been a major task of tropical forest ecology. One of the most promising mechanisms is negative density dependence (NDD) of tree abundance driven by pests, including fungal diseases ('pest pressure')...
May 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28444952/similarity-in-volatile-communities-leads-to-increased-herbivory-and-greater-tropical-forest-diversity
#4
Tara Joy Massad, Marcílio Martins de Moraes, Casey Philbin, Celso Oliveira, Gerardo Cebrian Torrejon, Lydia Fumiko Yamaguchi, Christopher S Jeffrey, Lee A Dyer, Lora A Richards, Massuo Jorge Kato
A longstanding paradigm in ecology is that there are positive associations between herbivore diversity, specialization, and plant species diversity, with a focus on taxonomic diversity. However, phytochemical diversity is also an informative metric, as insect herbivores interact with host-plants not as taxonomic entities, but as sources of nutrients, primary metabolites, and mixtures of attractant and repellant chemicals. The present research examines herbivore responses to phytochemical diversity measured as volatile similarity in the tropical genus Piper...
April 26, 2017: Ecology
https://www.readbyqxmd.com/read/28402583/the-potential-indirect-effects-among-plants-via-shared-hummingbird-pollinators-are-structured-by-phenotypic-similarity
#5
Pedro Joaquim Bergamo, Marina Wolowski, Pietro Kiyoshi Maruyama, Jeferson Vizentin-Bugoni, Luísa G Carvalheiro, Marlies Sazima
Plant species within communities may overlap in pollinators' use and influence visitation patterns of shared pollinators, potentially engaging in indirect interactions (e.g. facilitation or competition). While several studies have explored the mechanisms regulating insect-pollination networks, there is a lack of studies on bird-pollination systems, particularly in species-rich tropical areas. Here, we evaluated if phenotypic similarity, resource availability (floral abundance), evolutionary relatedness and flowering phenology affect the potential for indirect effects via shared pollinators in hummingbird-pollinated plant species within four communities in the Brazilian Atlantic forest...
April 12, 2017: Ecology
https://www.readbyqxmd.com/read/28338970/woody-plant-ecosystems-under-climate-change-and-air-pollution-response-consistencies-across-zonobiomes
#6
R Matyssek, A R Kozovits, G Wieser, J King, H Rennenberg
Forests store the largest terrestrial pools of carbon (C), helping to stabilize the global climate system, yet are threatened by climate change (CC) and associated air pollution (AP, highlighting ozone (O3) and nitrogen oxides (NOx)). We adopt the perspective that CC-AP drivers and physiological impacts are universal, resulting in consistent stress responses of forest ecosystems across zonobiomes. Evidence supporting this viewpoint is presented from the literature on ecosystem gross/net primary productivity and water cycling...
March 14, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28298349/network-reorganization-and-breakdown-of-an-ant-plant-protection-mutualism-with-elevation
#7
Nichola S Plowman, Amelia S C Hood, Jimmy Moses, Conor Redmond, Vojtech Novotny, Petr Klimes, Tom M Fayle
Both the abiotic environment and the composition of animal and plant communities change with elevation. For mutualistic species, these changes are expected to result in altered partner availability, and shifts in context-dependent benefits for partners. To test these predictions, we assessed the network structure of terrestrial ant-plant mutualists and how the benefits to plants of ant inhabitation changed with elevation in tropical forest in Papua New Guinea. At higher elevations, ant-plants were rarer, species richness of both ants and plants decreased, and the average ant or plant species interacted with fewer partners...
March 15, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28247414/multidimensional-tree-niches-in-a-tropical-dry-forest
#8
Sandeep Pulla, Hebbalalu S Suresh, Handanakere S Dattaraja, Raman Sukumar
The extent to which interspecific niche differences structure plant communities is highly debated, with extreme viewpoints ranging from fine-scaled niche partitioning, where every species in the community is specialized to a distinct niche, to neutrality, where species have no niche or fitness differences. However, there exists a default position wherein niches of species in a community are determined by their evolutionary and biogeographic histories, irrespective of other species within the community. According to this viewpoint, a broad range of pair-wise niche overlaps-from completely overlapping to completely distinct-are expected in any community without the need to invoke interspecific interactions...
March 1, 2017: Ecology
https://www.readbyqxmd.com/read/28241033/intraspecific-leaf-trait-variability-along-a-boreal-to-tropical-community-diversity-gradient
#9
Cristina C Bastias, Claire Fortunel, Fernando Valladares, Christopher Baraloto, Raquel Benavides, William Cornwell, Lars Markesteijn, Alexandre A de Oliveira, Jeronimo B B Sansevero, Marcel C Vaz, Nathan J B Kraft
Disentangling the mechanisms that shape community assembly across diversity gradients is a central matter in ecology. While many studies have explored community assembly through species average trait values, there is a growing understanding that intraspecific trait variation (ITV) can also play a critical role in species coexistence. Classic biodiversity theory hypothesizes that higher diversity at species-rich sites can arise from narrower niches relative to species-poor sites, which would be reflected in reduced ITV as species richness increases...
2017: PloS One
https://www.readbyqxmd.com/read/28214038/maximising-synergy-among-tropical-plant-systematists-ecologists-and-evolutionary-biologists
#10
REVIEW
Timothy R Baker, R Toby Pennington, Kyle G Dexter, Paul V A Fine, Helen Fortune-Hopkins, Euridice N Honorio, Isau Huamantupa-Chuquimaco, Bente B Klitgård, Gwilym P Lewis, Haroldo C de Lima, Peter Ashton, Christopher Baraloto, Stuart Davies, Michael J Donoghue, Maria Kaye, W John Kress, Caroline E R Lehmann, Abel Monteagudo, Oliver L Phillips, Rodolfo Vasquez
Closer collaboration among ecologists, systematists, and evolutionary biologists working in tropical forests, centred on studies within long-term permanent plots, would be highly beneficial for their respective fields. With a key unifying theme of the importance of vouchered collection and precise identification of species, especially rare ones, we identify four priority areas where improving links between these communities could achieve significant progress in biodiversity and conservation science: (i) increasing the pace of species discovery; (ii) documenting species turnover across space and time; (iii) improving models of ecosystem change; and (iv) understanding the evolutionary assembly of communities and biomes...
April 2017: Trends in Ecology & Evolution
https://www.readbyqxmd.com/read/28211583/in%C3%A2-situ-temperature-response-of-photosynthesis-of-42-tree-and-liana-species-in-the-canopy-of-two-panamanian-lowland-tropical-forests-with-contrasting-rainfall-regimes
#11
Martijn Slot, Klaus Winter
Tropical forests contribute significantly to the global carbon cycle, but little is known about the temperature response of photosynthetic carbon uptake in tropical species, and how this varies within and across forests. We determined in situ photosynthetic temperature-response curves for upper canopy leaves of 42 tree and liana species from two tropical forests in Panama with contrasting rainfall regimes. On the basis of seedling studies, we hypothesized that species with high photosynthetic capacity - light-demanding, fast-growing species - would have a higher temperature optimum of photosynthesis (TOpt ) than species with low photosynthetic capacity - shade-tolerant, slow-growing species - and that, therefore, TOpt would scale with the position of a species on the slow-fast continuum of plant functional traits...
February 17, 2017: New Phytologist
https://www.readbyqxmd.com/read/28181524/lack-of-phylogenetic-signals-within-environmental-niches-of-tropical-tree-species-across-life-stages
#12
Caicai Zhang, Jie Yang, Liqing Sha, Xiuqin Ci, Jie Li, Min Cao, Calum Brown, Nathan G Swenson, Luxiang Lin
The lasting imprint of phylogenetic history on current day ecological patterns has long intrigued biologists. Over the past decade ecologists have increasingly sought to quantify phylogenetic signals in environmental niche preferences and, especially, traits to help uncover the mechanisms driving plant community assembly. However, relatively little is known about how phylogenetic patterns in environmental niches and traits compare, leaving significant uncertainty about the ecological implications of trait-based analyses...
February 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28148744/a-phosphorus-threshold-for-mycoheterotrophic-plants-in-tropical-forests
#13
Merlin Sheldrake, Nicholas P Rosenstock, Daniel Revillini, Pål Axel Olsson, S Joseph Wright, Benjamin L Turner
The majority of terrestrial plants associate with arbuscular mycorrhizal (AM) fungi, which typically facilitate the uptake of limiting mineral nutrients by plants in exchange for plant carbon. However, hundreds of non-photosynthetic plant species-mycoheterotrophs-depend entirely on AM fungi for carbon as well as mineral nutrition. Mycoheterotrophs can provide insight into the operation and regulation of AM fungal relationships, but little is known about the factors, fungal or otherwise, that affect mycoheterotroph abundance and distribution...
February 8, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28135760/landscape-scale-gpp-and-carbon-density-inform-patterns-and-impacts-of-an-invasive-tree-across-wet-forests-of-hawaii
#14
Jomar M Barbosa, Gregory P Asner, R Flint Hughes, M Tracy Johnson
Plant invasion typically occurs within a landscape-scale framework of abiotic and biotic conditions, often resulting in emergent feedbacks among environment, ecosystem functions, and the dominance of invasive species. Understanding the mechanisms underlying successful invasions is an important component of conservation and management efforts, but this has been poorly investigated in a spatially explicit manner. Knowing where and why invasion patterns change throughout the landscape enables managers to use context-specific controls on the spread of invasive species...
October 3, 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28031168/flowering-phenology-growth-forms-and-pollination-syndromes-in-tropical-dry-forest-species-influence-of-phylogeny-and-abiotic-factors
#15
Jorge Cortés-Flores, Karen Beatriz Hernández-Esquivel, Antonio González-Rodríguez, Guillermo Ibarra-Manríquez
PREMISE OF THE STUDY: Analyses of the influence of temporal variation in abiotic factors on flowering phenology of tropical dry forest species have not considered the possible response of species with different growth forms and pollination syndromes, while controlling for phylogenetic relationships among species. Here, we investigated the relationship between flowering phenology, abiotic factors, and plant functional attributes, while controlling for phylogenetic relationship among species, in a dry forest community in Mexico...
December 28, 2016: American Journal of Botany
https://www.readbyqxmd.com/read/28031166/very-small-relict-populations-suggest-high-extinction-debt-of-gingers-in-primary-forest-fragments-of-a-tropical-city
#16
Matti A Niissalo, Jana Leong-Škorničková, Gillian S Khew, Edward L Webb
PREMISE OF THE STUDY: Tropical plant communities in fragmented forests are likely to experience an extinction debt, i.e., the habitat cannot support as many species as are present due to reduced habitat size and connectivity. There are few estimates of the number of species that represent extinction debt, and the number of extinctions over time has rarely been recorded. We recorded population sizes to assess threats and extinctions in gingers (sensu Zingiberales) in fragmented rainforest in Singapore, ca...
December 28, 2016: American Journal of Botany
https://www.readbyqxmd.com/read/27984635/sources-of-variation-in-foliar-secondary-chemistry-in-a-tropical-forest-tree-community
#17
Brian E Sedio, Juan Camilo Rojas Echeverri, Cristopher A P Boya, S Joseph Wright
Specialist herbivores and pathogens could induce negative conspecific density dependence among their hosts and thereby contribute to the diversity of plant communities. A small number of hyperdiverse genera comprise a large portion of tree diversity in tropical forests. These closely related congeners are likely to share natural enemies. Diverse defenses could still allow congeners to partition niche space defined by natural enemies, but interspecific differences in defenses would have to exceed intraspecific variation in defenses...
December 16, 2016: Ecology
https://www.readbyqxmd.com/read/27928045/using-avian-functional-traits-to-assess-the-impact-of-land-cover-change-on-ecosystem-processes-linked-to-resilience-in-tropical-forests
#18
Tom P Bregman, Alexander C Lees, Hannah E A MacGregor, Bianca Darski, Nárgila G de Moura, Alexandre Aleixo, Jos Barlow, Joseph A Tobias
Vertebrates perform key roles in ecosystem processes via trophic interactions with plants and insects, but the response of these interactions to environmental change is difficult to quantify in complex systems, such as tropical forests. Here, we use the functional trait structure of Amazonian forest bird assemblages to explore the impacts of land-cover change on two ecosystem processes: seed dispersal and insect predation. We show that trait structure in assemblages of frugivorous and insectivorous birds remained stable after primary forests were subjected to logging and fire events, but that further intensification of human land use substantially reduced the functional diversity and dispersion of traits, and resulted in communities that occupied a different region of trait space...
December 14, 2016: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/27928036/the-value-of-trophic-interactions-for-ecosystem-function-dung-beetle-communities-influence-seed-burial-and-seedling-recruitment-in-tropical-forests
#19
Hannah M Griffiths, Richard D Bardgett, Julio Louzada, Jos Barlow
Anthropogenic activities are causing species extinctions, raising concerns about the consequences of changing biological communities for ecosystem functioning. To address this, we investigated how dung beetle communities influence seed burial and seedling recruitment in the Brazilian Amazon. First, we conducted a burial and retrieval experiment using seed mimics. We found that dung beetle biomass had a stronger positive effect on the burial of large than small beads, suggesting that anthropogenic reductions in large-bodied beetles will have the greatest effect on the secondary dispersal of large-seeded plant species...
December 14, 2016: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/27924430/nutrient-enrichment-effects-on-mycorrhizal-fungi-in-an-andean-tropical-montane-forest
#20
Camille S Delavaux, Tessa Camenzind, Jürgen Homeier, Rosa Jiménez-Paz, Mark Ashton, Simon A Queenborough
Nitrogen (N) and phosphorus (P) deposition are increasing worldwide largely due to increased fertilizer use and fossil fuel combustion. Most work with N and P deposition in natural ecosystems has focused on temperate, highly industrialized, regions. Tropical regions are becoming more developed, releasing large amounts of these nutrients into the atmosphere. Nutrient enrichment in nutrient-poor systems such as tropical montane forest can represent a relatively large shift in nutrient availability, especially for sensitive microorganisms such as arbuscular mycorrhizal fungi (AMF)...
December 6, 2016: Mycorrhiza
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