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https://www.readbyqxmd.com/read/28107517/high-emigration-propensity-and-low-mortality-on-transfer-drives-female-biased-dispersal-of-pyriglena-leucoptera-in-fragmented-landscapes
#1
Marcelo Awade, Carlos Candia-Gallardo, Cintia Cornelius, Jean Paul Metzger
Dispersal is a biological process performed in three stages: emigration, transfer and immigration. Intra-specific variation on dispersal behavior, such as sex-bias, is very common in nature, particularly in birds and mammals. However, dispersal is difficult to measure in the field and many hypotheses concerning the causes of sex-biased dispersal remain without empirical confirmation. An important limitation of most empirical studies is that inferences about sex-biased dispersal are based only on emigration proneness or immigration success data...
2017: PloS One
https://www.readbyqxmd.com/read/28105565/what-are-the-socioeconomic-implications-of-the-value-chain-of-biodiversity-products-a-case-study-in-northeastern-brazil
#2
Rafael Ricardo Vasconcelos da Silva, Laura Jane Gomes, Ulysses Paulino Albuquerque
The trade in biodiversity products has gained increasing importance in conservation and livelihood strategies. The aim of this study is to describe and analyze the socioeconomic aspects and dynamics of the production and commercialization of two important products of Brazilian biodiversity from the fruits of Caryocar coriaceum Wittm. and Dimorphandra gardneriana Tul. Interviews were conducted with who were involved in the various stages of value chains. Data were analyzed under an analytical/descriptive approach...
February 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28102945/learning-based-deformable-image-registration-for-infant-mr-images-in-the-first-year-of-life
#3
Shunbo Hu, Lifang Wei, Yaozong Gao, Yanrong Guo, Guorong Wu, Dinggang Shen
PURPOSE: Many brain development studies have been devoted to investigate dynamic structural and functional changes in the first year of life. To quantitatively measure brain development in such a dynamic period, accurate image registration for different infant subjects with possible large age gap is of high demand. Although many state-of-the-art image registration methods have been proposed for young and elderly brain images, very few registration methods work for infant brain images acquired in the first year of life, because of (a) large anatomical changes due to fast brain development and (b) dynamic appearance changes due to white-matter myelination...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102913/autumn-photosynthetic-decline-and-growth-cessation-in-seedlings-of-white-spruce-are-decoupled-under-warming-and-photoperiod-manipulations
#4
Joseph R Stinziano, Danielle A Way
Climate warming is expected to increase the seasonal duration of photosynthetic carbon fixation and tree growth in high latitude forests. However photoperiod, a crucial cue for seasonality, will remain constant, which may constrain tree responses to warming. We investigated the effects of temperature and photoperiod on weekly changes in photosynthetic capacity, leaf biochemistry and growth in seedlings of a boreal evergreen conifer, white spruce (Picea glauca (Moench) Voss). Warming delayed autumn declines in photosynthetic capacity, extending the period when seedlings had high carbon uptake...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28100029/isolation-with-asymmetric-gene-flow-during-the-nonsynchronous-divergence-of-dry-forest-birds
#5
Jessica A Oswald, Isaac Overcast, William M Mauck, Michael J Andersen, Brian Tilston Smith
Dry forest bird communities in South America are often fragmented by intervening mountains and rainforests, generating high local endemism. The historical assembly of communities often results from dynamic processes linked to numerous population histories among co-distributed species. Nevertheless, species may diversify in the same way through time if landscape and environmental features, or species ecologies, similarly structure populations. Here we tested whether six co-distributed taxon pairs that occur in the dry forests of the Tumbes and Marañón Valley of northwestern South America show concordant patterns and modes of diversification...
January 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28095927/small-alteration-big-impacts-effects-of-small-scale-riparian-forest-management-on-host-parasite-dynamics-in-streams
#6
C Lagrue, A A Besson, A Lecerf
Environmental changes and ecological disturbances can have large and unpredictable effects on parasite dynamics. Increasing human impacts on freshwater ecosystems through land use may thus modify the distribution and abundance of parasites and have cascading effects on host populations. Here we tested the effects of small-scale riparian forest management on the nematode Cystidicoloides ephemeridarum and its insect intermediate host Ephemera danica in forested streams. We assessed the impacts of harvesting riparian trees on parasite prevalence and abundance concomitantly with host densities...
January 18, 2017: Journal of Helminthology
https://www.readbyqxmd.com/read/28089840/biogeography-and-diversification-dynamics-of-the-african-woodpeckers
#7
Jérôme Fuchs, Jean-Marc Pons, Rauri C K Bowie
The dynamics of species accumulation of African terrestrial vertebrates over time remains underexplored in comparison with those in the New World, despite Africa hosting about 25% of the world's avian diversity. This lack of knowledge hampers our understanding of the fundamental processes that drive biodiversity and the dynamics of speciation. To begin to address this gap, we reconstructed species-level phylogenies of two unrelated clades of African woodpeckers (12 species of Geocolaptes/Campethera and 13 species of Chloropicus/ Mesopicos/ Dendropicos/Ipophilus) that diverged from their closest Indo-Malayan relatives at similar times...
January 12, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28088026/current-ambient-concentrations-of-ozone-in-panama-modulate-the-leaf-chemistry-of-the-tropical-tree-ficus-insipida
#8
Gerald F Schneider, Alexander W Cheesman, Klaus Winter, Benjamin L Turner, Stephen Sitch, Thomas A Kursar
Tropospheric ozone (O3) is a major air pollutant and greenhouse gas, affecting carbon dynamics, ecological interactions, and agricultural productivity across continents and biomes. Elevated [O3] has been documented in tropical evergreen forests, the epicenters of terrestrial primary productivity and plant-consumer interactions. However, the effects of O3 on vegetation have not previously been studied in these forests. In this study, we quantified ambient O3 in a region shared by forests and urban/commercial zones in Panama and found levels two to three times greater than in remote tropical sites...
December 27, 2016: Chemosphere
https://www.readbyqxmd.com/read/28087074/quantifying-loading-toxic-concentrations-and-systemic-persistence-of-chloride-in-a-contemporary-mixed-land-use-watershed-using-an-experimental-watershed-approach
#9
J A Hubbart, E Kellner, L W Hooper, S Zeiger
A nested-scale experimental watershed study was implemented to quantify loading and persistence of chloride in an urbanizing, mixed-land-use watershed. A Midwest USA (Missouri) watershed was partitioned into five sub-basins with contrasting dominant land use. Streamwater was tested for chloride concentration four days per week from October 2009 through May 2014 at each site. Monitoring sites included co-located gauging and climate stations recording variables at 30-minute intervals. Results indicate significant (p<0...
January 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28075025/warmer-temperatures-reduce-the-influence-of-an-important-keystone-predator
#10
Chiara Bonaviri, Michael Graham, Paola Gianguzza, Nick T Shears
Predator-prey interactions may be strongly influenced by temperature variations in marine ecosystems. Consequently, climate change may alter the importance of predators with repercussions for ecosystem functioning and structure. In North-eastern Pacific kelp forests, the starfish Pycnopodia helianthoides is known to be an important predator of the purple sea urchin Strongylocentrotus purpuratus. Here we investigated the influence of water temperature on this predator-prey interaction by: (1) assessing the spatial distribution and temporal dynamics of both species across a temperature gradient in the northern Channel Islands, California, and (2) investigating how the feeding rate of P...
January 11, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28073802/assemblage-composition-of-fungal-wood-decay-species-has-major-influence-on-how-climate-and-wood-quality-modify-decomposition
#11
Parvathy Venugopal, Kaisa Junninen, Mattias Edman, Jari Kouki
The interactions among saprotrophic fungal species, as well as their interactions with environmental factors, may have a major influence on wood decay and carbon release in ecosystems. We studied the effects that decomposer diversity (species richness and assemblage composition) have on wood decomposition when the climatic variables and substrate quality vary simultaneously. We used two temperature (16 and 21(°)C) and two humidity (70% and 90%) levels at two wood qualities (wood from managed and old-growth forests) of Pinus sylvestris In a nine-month experiment, the effects of fungal diversity were tested using four wood-decaying fungi (Antrodia xantha, Dichomitus squalens, Fomitopsis pinicola and Gloeophyllum protractum) at assemblage levels one, two and four species...
January 10, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28072458/liana-effects-on-biomass-dynamics-strengthen-during-secondary-forest-succession
#12
Hao Ran Lai, Jefferson S Hall, Benjamin L Turner, Michiel van Breugel
Secondary forests are important carbon sinks, but their biomass dynamics vary markedly within and across landscapes. The biotic and abiotic drivers of this variation are still not well understood. We tested the effects of soil resource availability and competition by lianas on the biomass dynamics of young secondary tropical forests in Panama and assessed the extent to which liana effects were mediated by soil resource availability. Over a five year period, growth, mortality, and recruitment of woody plants of ≥1 cm diameter were monitored in 84 plots in 3-30 y-old secondary forests across the Agua Salud site in central Panama...
January 10, 2017: Ecology
https://www.readbyqxmd.com/read/28070286/influence-of-hydrological-pathways-on-dissolved-organic-carbon-fluxes-in-tropical-streams
#13
Eline Nayara Dantas da Costa, Jéssica Carneiro de Souza, Marilane Andrade Pereira, Marcelo Friederichs Landim de Souza, Weber Friederichs Landim de Souza, Daniela Mariano Lopes da Silva
Water flow pathways and water balance are fundamental components for understanding the dynamics of C in the soil/water interface of small basins. The objective of this study was to describe the seasonal variations and estimate the annual balance of dissolved organic carbon (DOC) by comparing two tropical microbasins (preserved forest-PF and cacao plantation-CP). Twenty-one weekly collections were conducted from September to December 2012 and from April to June 2013. The calculation of the partial balance considered precipitation (P) as inflow and the stream as outflow...
January 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28062727/dynamics-of-stem-water-uptake-among-isohydric-and-anisohydric-species-experiencing-a-severe-drought
#14
Koong Yi, Danilo Dragoni, Richard P Phillips, D Tyler Roman, Kimberly A Novick
Predicting the impact of drought on forest ecosystem processes requires an understanding of trees' species-specific responses to drought, especially in the Eastern USA, where species composition is highly dynamic due to historical changes in land use and fire regime. Here, we adapted a framework that classifies trees' water-use strategy along the spectrum of isohydric to anisohydric behavior to determine the responses of three canopy-dominant species to drought. We used a collection of leaf-level gas exchange, tree-level sap flux and stand-level eddy covariance data collected in south-central Indiana from 2011 to 2013, which included an unusually severe drought in the summer of 2012...
January 5, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28060917/a-novel-mouse-segmentation-method-based-on-dynamic-contrast-enhanced-micro-ct-images
#15
Dongmei Yan, Zhihong Zhang, Qingming Luo, Xiaoquan Yang
With the development of hybrid imaging scanners, micro-CT is widely used in locating abnormalities, studying drug metabolism, and providing structural priors to aid image reconstruction in functional imaging. Due to the low contrast of soft tissues, segmentation of soft tissue organs from mouse micro-CT images is a challenging problem. In this paper, we propose a mouse segmentation scheme based on dynamic contrast enhanced micro-CT images. With a homemade fast scanning micro-CT scanner, dynamic contrast enhanced images were acquired before and after injection of non-ionic iodinated contrast agents (iohexol)...
2017: PloS One
https://www.readbyqxmd.com/read/28060848/mitigating-future-avian-malaria-threats-to-hawaiian-forest-birds-from-climate-change
#16
Wei Liao, Carter T Atkinson, Dennis A LaPointe, Michael D Samuel
Avian malaria, transmitted by Culex quinquefasciatus mosquitoes in the Hawaiian Islands, has been a primary contributor to population range limitations, declines, and extinctions for many endemic Hawaiian honeycreepers. Avian malaria is strongly influenced by climate; therefore, predicted future changes are expected to expand transmission into higher elevations and intensify and lengthen existing transmission periods at lower elevations, leading to further population declines and potential extinction of highly susceptible honeycreepers in mid- and high-elevation forests...
2017: PloS One
https://www.readbyqxmd.com/read/28052495/life-and-death-of-picea-abies-after-bark-beetle-outbreak-ecological-processes-driving-seedling-recruitment
#17
Martin Macek, Jan Wild, Martin Kopecký, Jaroslav Červenka, Miroslav Svoboda, Jitka Zenáhlíková, Josef Brůna, Reinhard Mosandl, Anton Fischer
The severity and spatial extent of bark-beetle outbreaks substantially increased in recent decades worldwide. The ongoing controversy about natural forest recovery after these outbreaks highlights the need for individual-based long-term studies, which disentangle processes driving forest regeneration. However, such studies have been lacking. To fill this gap, we followed the fates of 2,552 individual seedlings for 12 years after a large-scale bark-beetle outbreak that caused complete canopy dieback in mountain Norway spruce (Picea abies) forests in southeast Germany...
January 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28052391/the-present-is-the-key-to-the-past-linking-regime-shifts-in-kelp-beds-to-the-distribution-of-deep-living-sea-urchins
#18
Karen Filbee-Dexter, Robert E Scheibling
Understanding processes that drive sudden shifts in ecosystem structure and function has become an important research focus for coastal management. In kelp bed ecosystems, regime shifts occur when high densities of sea urchins destructively graze kelp and create coralline algal barrens. While the importance of predation and disease in mediating shifts between kelp beds and barrens on shallow rocky reefs has been well documented, little is known about the role of deep-living urchins in these alternative stable-state dynamics...
January 2017: Ecology
https://www.readbyqxmd.com/read/28052385/fungi-exposed-to-chronic-nitrogen-enrichment-are-less-able-to-decay-leaf-litter
#19
Linda T A van Diepen, Serita D Frey, Elizabeth A Landis, Eric W Morrison, Anne Pringle
Saprotrophic fungi are the primary decomposers of plant litter in temperate forests, and their activity is critical for carbon (C) and nitrogen (N) cycling. Simulated atmospheric N deposition is associated with reduced fungal biomass, shifts in fungal community structure, slowed litter decay, and soil C accumulation. Although rarely studied, N deposition may also result in novel selective pressures on fungi, affecting evolutionary trajectories. To directly test if long-term N enrichment reshapes fungal responses to N, we isolated decomposer fungi from a long-term (28 yr) N-addition experiment and used a common garden approach to compare growth rates and decay abilities of isolates from control and N-amended plots...
January 2017: Ecology
https://www.readbyqxmd.com/read/28052073/landscape-use-and-co-occurrence-patterns-of-neotropical-spotted-cats
#20
Mariana B Nagy-Reis, James D Nichols, Adriano G Chiarello, Milton Cezar Ribeiro, Eleonore Z F Setz
Small felids influence ecosystem dynamics through prey and plant population changes. Although most of these species are threatened, they are accorded one of the lowest research efforts of all felids, and we lack basic information about them. Many felids occur in sympatry, where intraguild competition is frequent. Therefore, assessing the role of interspecific interactions along with the relative importance of landscape characteristics is necessary to understand how these species co-occur in space. Here, we selected three morphologically similar and closely related species of small Neotropical cats to evaluate the roles of interspecific interactions, geomorphometry, environmental, and anthropogenic landscape characteristics on their habitat use...
2017: PloS One
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