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https://www.readbyqxmd.com/read/29035010/ecosystem-regime-shifts-disrupt-trophic-structure
#1
Tessa N Hempson, Nicholas A J Graham, M Aaron MacNeil, Andrew S Hoey, Shaun K Wilson
Regime shifts between alternative stable ecosystem states are becoming commonplace due to the combined effects of local stressors and global climate change. Alternative states are characterised as substantially different in form and function to pre-disturbance states, disrupting the delivery of ecosystem services and functions. On coral reefs, regime shifts are typically characterised by a change in the benthic composition from coral- to macroalgal-dominance. Such fundamental shifts in the benthos are anticipated to impact associated fish communities that are reliant on the reef for food and shelter, yet there is limited understanding of how regime shifts propagate through the fish community over time, relative to initial or recovery conditions...
October 16, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/29029220/effect-of-host-traits-and-land-use-changes-on-the-gut-microbiota-of-the-namibian-black-backed-jackal-canis-mesomelas
#2
Sebastian Menke, Matthias Meier, John K E Mfune, Joerg Melzheimer, Bettina Wachter, Simone Sommer
Host traits and environmental factors drive the natural variation in gut microbiota and disruption in homeostasis can cause infections and chronic diseases. African wildlife is increasingly facing human-induced agricultural habitats, which also amplifies the contact probability with livestock with unknown consequences for wildlife gut microbiotas and the risk of transmission of potentially pathogenic bacteria. We applied high-throughput sequencing of bacterial 16S rRNA genes and microsatellite genotyping to investigate the impact of host traits and habitat use on the gut microbiotas of black-backed jackals (Canis mesomelas)...
September 25, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29028001/soil-protist-communities-form-a-dynamic-hub-in-the-soil-microbiome
#3
Wu Xiong, Alexandre Jousset, Sai Guo, Ida Karlsson, Qingyun Zhao, Huasong Wu, George A Kowalchuk, Qirong Shen, Rong Li, Stefan Geisen
Soil microbes are essential for soil fertility. However, most studies focus on bacterial and/or fungal communities, while the top-down drivers of this microbiome composition, protists, remain poorly understood. Here, we investigated how soil amendments affect protist communities and inferred potential interactions with bacteria and fungi. Specific fertilization treatments impacted both the structure and function of protist communities. Organic fertilizer amendment strongly reduced the relative abundance of plant pathogenic protists and increased bacterivorous and omnivorous protists...
October 13, 2017: ISME Journal
https://www.readbyqxmd.com/read/28986749/pig-models-on-intestinal-development-and-therapeutics
#4
REVIEW
Lanmei Yin, Huansheng Yang, Jianzhong Li, Yali Li, Xueqing Ding, Guoyao Wu, Yulong Yin
The gastrointestinal tract plays a vital role in nutrient supply, digestion, and absorption, and has a crucial impact on the entire organism. Much attention is being paid to utilize animal models to study the pathogenesis of gastrointestinal diseases in response to intestinal development and health. The piglet has a body size similar to that of the human and is an omnivorous animal with comparable anatomy, nutritional requirements, and digestive and associated inflammatory processes, and displays similarities to the human intestinal microbial ecosystem, which make piglets more appropriate as an animal model for human than other non-primate animals...
October 6, 2017: Amino Acids
https://www.readbyqxmd.com/read/28977774/ecology-worldwide-spread-and-management-of-the-invasive-south-american-tomato-pinworm-tuta-absoluta-past-present-and-future
#5
Antonio Biondi, Raul Narciso C Guedes, Fang-Hao Wan, Nicolas Desneux
The South American tomato pinworm, Tuta absoluta (Meyrick), is native to the eastern Neotropics. After invading Spain in 2006, it spread rapidly throughout Afro-Eurasia and has become a major threat to world tomato production. Integrated pest management (IPM) strategies have been developed, but widespread insecticide use has caused selection for insecticide resistances as well as undesirable effects on key beneficial arthropods. Augmentation and conservation biological control relying on omnivorous mirid predators has proved successful for management of T...
October 4, 2017: Annual Review of Entomology
https://www.readbyqxmd.com/read/28973021/pycnoscelus-surinamensis-cockroach-gut-microbiota-respond-consistently-to-a-fungal-diet-without-mirroring-those-of-fungus-farming-termites
#6
Callum Richards, Saria Otani, Aram Mikaelyan, Michael Poulsen
The gut microbiotas of cockroaches and termites play important roles in the symbiotic digestion of dietary components, such as lignocellulose. Diet has been proposed as a primary determinant of community structure within the gut, acting as a selection force to shape the diversity observed within this "bioreactor", and as a key factor for the divergence of the termite gut microbiota from the omnivorous cockroach ancestor. The gut microbiota in most termites supports primarily the breakdown of lignocellulose, but the fungus-farming sub-family of higher termites has become similar in gut microbiota to the ancestral omnivorous cockroaches...
2017: PloS One
https://www.readbyqxmd.com/read/28944016/allometric-trajectories-of-body-and-head-morphology-in-three-sympatric-arctic-charr-salvelinus-alpinus-l-morphs
#7
Marianne Knutsdotter Simonsen, Anna Siwertsson, Colin Ean Adams, Per-Arne Amundsen, Kim Præbel, Rune Knudsen
A study of body and head development in three sympatric reproductively isolated Arctic charr (Salvelinus alpinus (L.)) morphs from a subarctic lake (Skogsfjordvatn, northern Norway) revealed allometric trajectories that resulted in morphological differences. The three morphs were ecologically assigned to a littoral omnivore, a profundal benthivore and a profundal piscivore, and this was confirmed by genetic analyses (microsatellites). Principal component analysis was used to identify the variables responsible for most of the morphological variation of the body and head shape...
September 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28939910/nutrient-quality-of-vertebrate-dung-as-a-diet-for-dung-beetles
#8
Kevin Frank, Adrian Brückner, Andrea Hilpert, Michael Heethoff, Nico Blüthgen
At the basis of a trophic web, coprophagous animals like dung beetles (Scarabaeoidea) utilize resources that may have advantages (easy gain and handling) as well as drawbacks (formerly processed food). Several studies have characterized the nutrients, e.g. C/N ratios and organic matter content, for specific types of dung. However, a comparative approach across dung types and feeding guilds of dung producers, and relationships between dung nutrients and preferences by coprophages, have been missing. Hence, we analyzed water content, C/N ratio, amino acid, neutral lipid fatty acid, free fatty acid and sterol composition and concentrations in dung from 23 vertebrates, including carnivore, omnivore and herbivore species...
September 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28938794/association-between-plant-based-diets-and-plasma-lipids-a-systematic-review-and-meta-analysis
#9
Yoko Yokoyama, Susan M Levin, Neal D Barnard
Context: Although a recent meta-analysis of randomized controlled trials showed that adoption of a vegetarian diet reduces plasma lipids, the association between vegetarian diets and long-term effects on plasma lipids has not been subjected to meta-analysis. Objective: The aim was to conduct a systematic review and meta-analysis of observational studies and clinical trials that have examined associations between plant-based diets and plasma lipids. Data Sources: MEDLINE, Web of Science, and the Cochrane Central Register of Controlled Trials were searched for articles published in English until June 2015...
September 1, 2017: Nutrition Reviews
https://www.readbyqxmd.com/read/28922420/stable-c-and-n-isotope-analysis-of-hair-suggest-undernourishment-as-a-factor-in-the-death-of-a-mummified-girl-from-late-19th-century-san-francisco-ca
#10
Jelmer W Eerkens, Bryna Hull, Jena Goodman, Angela Evoy, Joshua D Kapp, Sidra Hussain, Richard E Green
The chance discovery of a 1.5-3.5 years old mummified girl presents a unique opportunity to further our understanding of health and disease among children in 19th Century San Francisco. This study focuses on carbon and nitrogen stable isotope signatures in serial samples of hair that cover the last 14 months of her life. Results suggest an initial omnivorous diet with little input from marine resources or C4 plants. Around six months before death δ15N starts a steady increase, with a noticeable acceleration just two months before she died...
2017: PloS One
https://www.readbyqxmd.com/read/28916914/the-effects-of-protein-and-fiber-content-on-gut-structure-and-function-in-zebrafish-danio-rerio
#11
Samantha C Leigh, Bao-Quang Nguyen-Phuc, Donovan P German
Chemical reactor theory (CRT) suggests that the digestive tract functions as a chemical reactor for processing food. Presumably, gut structure and function should match diet to ensure adequate nutrient and energy uptake to maintain performance. Within CRT, dietary biochemical composition is the most important factor affecting gut structure and function in vertebrates. We fed Danio rerio (zebrafish) diets ranging from high- to moderate- to low-quality (i.e., ranging from high-protein, low-fiber to low-protein, high-fiber), and observed how gut length and surface area, as well as the activity levels of digestive enzymes (amylase, maltase, trypsin, aminopeptidase, and lipase) shifted in response to these dietary changes...
September 15, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28913773/food-nitrogen-footprint-reductions-related-to-a-balanced-japanese-diet
#12
Azusa Oita, Ichiro Nagano, Hiroyuki Matsuda
Dietary choices largely affect human-induced reactive nitrogen accumulation in the environment and resultant environmental problems. A nitrogen footprint (NF) is an indicator of how an individual's consumption patterns impact nitrogen pollution. Here, we examined the impact of changes in the Japanese diet from 1961 to 2011 and the effect of alternative diets (the recommended protein diet, a pescetarian diet, a low-NF food diet, and a balanced Japanese diet) on the food NF. The annual per capita Japanese food NF has increased by 55% as a result of dietary changes since 1961...
September 14, 2017: Ambio
https://www.readbyqxmd.com/read/28898520/sugars-and-beyond-the-role-of-sugars-and-the-other-nutrients-and-their-potential-impact-on-caries
#13
REVIEW
Rodrigo A Giacaman
The traditional concept of caries as a multifactorial transmittable and infectious disease has been challenged. Novel conceptual ideas have come to add to the complexity of this highly prevalent disease worldwide. Current etiological understanding of the disease has emphasized the pivotal role of sugar in caries. In fact, current definition points towards an ecological disease caused by the commensal microbiota that under ecological imbalances, mainly due to high and or frequent sugar consumption, creates a state of dysbiosis in the oral biofilm...
September 12, 2017: Oral Diseases
https://www.readbyqxmd.com/read/28898441/three-dimensional-reconstruction-of-the-pharyngeal-gland-cells-in-the-predatory-nematode-pristionchus-pacificus
#14
Metta Riebesell, Ralf J Sommer
Pristionchus pacificus is a model system in evolutionary biology and for comparison to Caenorhabditis elegans. As a necromenic nematode often found in association with scarab beetles, P. pacificus exhibits omnivorous feeding that is characterized by a mouth-form dimorphism, an example of phenotypic plasticity. Eurystomatous animals have a dorsal and a sub-ventral tooth enabling predatory feeding on other nematodes whereas stenostomatous animals have only a dorsal tooth and are microbivorous. Both mouth forms of P...
September 12, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28892138/toward-a-geography-of-omnivory-omnivores-increase-carnivory-when-sodium-is-limiting
#15
Natalie A Clay, Richard J Lehrter, Michael Kaspari
Toward understanding the geography of omnivory, we tested three hypotheses that predict the proportion of animal tissue consumed: The Sodium Limitation Hypothesis predicts that omnivores increase animal consumption in Na-poor environments because Na bioaccumulates from plants to predators; thus, heterotrophs are Na-rich sources. The Nitrogen Limitation and Habitat Productivity Hypotheses use the same logic to predict more animal consumption in N-poor and productive environments respectively. Omnivory is a common trophic strategy, but what determines the balance of plant and animal tissue omnivores consume is relatively unexplored...
September 11, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28887816/the-little-things-that-run-a-general-scaling-of-invertebrate-exploratory-speed-with-body-mass
#16
Myriam R Hirt, Tobias Lauermann, Ulrich Brose, Lucas P J J Noldus, Anthony I Dell
Speed is a key trait of animal movement, and while much is already known about vertebrate speed and how it scales with body mass, studies on invertebrates are sparse, especially across diverse taxonomic groups. Here, we used automated image-based tracking to characterize the exploratory (voluntary) speed of 173 invertebrates comprising 57 species across 6 taxonomic groups (Arachnida, Chilopoda, Diplopoda, Entognatha, Insecta, Malacostraca) and 4 feeding types (carnivore, detritivore, herbivore, omnivore). Across all individuals, exploratory speed scaled with body mass following a power-law relationship with a scaling exponent of 0...
September 8, 2017: Ecology
https://www.readbyqxmd.com/read/28880219/influence-of-skeletal-muscle-carnosine-content-on-fatigue-during-repeated-resistance-exercise-in-recreationally-active-women
#17
Alyssa N Varanoske, Jay R Hoffman, David D Church, Ran Wang, Kayla M Baker, Sarah J Dodd, Nicholas A Coker, Leonardo P Oliveira, Virgil L Dawson, David H Fukuda, Jeffrey R Stout
Carnosine is a naturally occurring intramuscular dipeptide that is thought to attenuate fatigue during high-intensity exercise. Carnosine content is influenced by various factors, including gender and diet. Despite research reporting that carnosine content is lower in women compared to men and lower in vegetarians compared to omnivores, no investigations have examined carnosine content in women based on dietary protein intake and its effect on muscle fatigue. Twenty recreationally active women were assigned to either a high (HI; n = 5), moderate (MOD; n = 10), or low (LO; n = 5) group based upon intramuscular carnosine content of the vastus lateralis...
September 7, 2017: Nutrients
https://www.readbyqxmd.com/read/28873401/can-heat-waves-change-the-trophic-role-of-the-world-s-most-invasive-crayfish-diet-shifts-in-procambarus-clarkii
#18
Bruno M Carreira, Pedro Segurado, Anssi Laurila, Rui Rebelo
In the Mediterranean basin, the globally increasing temperatures are expected to be accompanied by longer heat waves. Commonly assumed to benefit cold-limited invasive alien species, these climatic changes may also change their feeding preferences, especially in the case of omnivorous ectotherms. We investigated heat wave effects on diet choice, growth and energy reserves in the invasive red swamp crayfish, Procambarus clarkii. In laboratory experiments, we fed juvenile and adult crayfish on animal, plant or mixed diets and exposed them to a short or a long heat wave...
2017: PloS One
https://www.readbyqxmd.com/read/28873278/long-term-trends-in-trait-structure-of-riverine-communities-facing-predation-risk-increase-and-trophic-resource-decline
#19
Adrien Latli, Jean-Pierre Descy, Cédric P Mondy, Mathieu Floury, Laurent Viroux, William Otjacques, Jonathan Marescaux, Eric Depiereux, Michael Ovidio, Philippe Usseglio-Polatera, Patrick Kestemont
Many large European rivers have undergone multiple pressures which have strongly impaired ecosystem functioning at different spatial and temporal scales. Global warming and other environmental changes have favoured the success of invasive species, deeply modifying the structure of aquatic communities in large rivers. Some exogenous species could alter trophic interactions within assemblages by increasing the predation risk for potential prey species (top-down effect) and limiting the dynamics of others via resource availability limitation (bottom-up effect)...
September 5, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28855519/spatial-effects-in-meta-foodwebs
#20
Edmund Barter, Thilo Gross
In ecology it is widely recognised that many landscapes comprise a network of discrete patches of habitat. The species that inhabit the patches interact with each other through a foodweb, the network of feeding interactions. The meta-foodweb model proposed by Pillai et al. combines the feeding relationships at each patch with the dispersal of species between patches, such that the whole system is represented by a network of networks. Previous work on meta-foodwebs has focussed on landscape networks that do not have an explicit spatial embedding, but in real landscapes the patches are usually distributed in space...
August 30, 2017: Scientific Reports
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