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https://www.readbyqxmd.com/read/28207804/spatio-temporal-dynamics-of-a-fish-predator-density-dependent-and-hydrographic-effects-on-baltic-sea-cod-population
#1
Valerio Bartolino, Huidong Tian, Ulf Bergström, Pekka Jounela, Eero Aro, Christian Dieterich, H E Markus Meier, Massimiliano Cardinale, Barbara Bland, Michele Casini
Understanding the mechanisms of spatial population dynamics is crucial for the successful management of exploited species and ecosystems. However, the underlying mechanisms of spatial distribution are generally complex due to the concurrent forcing of both density-dependent species interactions and density-independent environmental factors. Despite the high economic value and central ecological importance of cod in the Baltic Sea, the drivers of its spatio-temporal population dynamics have not been analytically investigated so far...
2017: PloS One
https://www.readbyqxmd.com/read/28202808/a-broad-scale-comparison-of-aerobic-activity-levels-in-vertebrates-endotherms-versus-ectotherms
#2
James F Gillooly, Juan Pablo Gomez, Evgeny V Mavrodiev
Differences in the limits and range of aerobic activity levels between endotherms and ectotherms remain poorly understood, though such differences help explain basic differences in species' lifestyles (e.g. movement patterns, feeding modes, and interaction rates). We compare the limits and range of aerobic activity in endotherms (birds and mammals) and ectotherms (fishes, reptiles, and amphibians) by evaluating the body mass-dependence of VO2 max, aerobic scope, and heart mass in a phylogenetic context based on a newly constructed vertebrate supertree...
February 22, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28199336/phycocharax-rasbora-a-new-genus-and-species-of-brazilian-tetra-characiformes-characidae-from-serra-do-cachimbo-rio-tapaj%C3%A3-s-basin
#3
Willian Massaharu Ohara, Juan Marcos Mirande, Flávio Cesar Thadeo de Lima
A new genus and species of characid fish is described from rio Braço Norte, a tributary of rio Teles Pires, Tapajós basin, Mato Groso, Brazil. The new taxa can be diagnosed from the remaining characids by a unique combination of characters that includes the presence of a single row of relatively compressed premaxillary teeth, large teeth with four to nine cusps on premaxillary and dentary, absence of pseudotympanum, incomplete lateral line with 7-13 pored scales, sexually-dimorphic males with distal margin of anal fin approximately straight, and presence of a nearly triangular and horizontally elongated blotch from the posterior half of the body to caudal peduncle...
2017: PloS One
https://www.readbyqxmd.com/read/28196485/rapid-evolution-of-genetic-and-phenotypic-divergence-in-atlantic-salmon-following-the-colonisation-of-two-new-branches-of-a-watercourse
#4
Arne Johan Jensen, Lars Petter Hansen, Bjørn Ove Johnsen, Sten Karlsson
BACKGROUND: Selection acts strongly on individuals that colonise a habitat and have phenotypic traits that deviate from the local optima. Our objective was to investigate the evolutionary rates in Atlantic salmon (Salmo salar) in a river system (the Vefsna watershed in Norway), fewer than 15 generations after colonisation of two new branches of the watercourse for spawning, which were made available by construction of fish ladders in 1889. METHODS: Differences in age and size were analysed using scale samples collected by anglers...
February 14, 2017: Genetics, Selection, Evolution: GSE
https://www.readbyqxmd.com/read/28196116/the-scoring-bias-in-reverse-docking-and-the-score-normalization-strategy-to-improve-success-rate-of-target-fishing
#5
Qiyao Luo, Liang Zhao, Jianxing Hu, Hongwei Jin, Zhenming Liu, Liangren Zhang
Target fishing often relies on the use of reverse docking to identify potential target proteins of ligands from protein database. The limitation of reverse docking is the accuracy of current scoring funtions used to distinguish true target from non-target proteins. Many contemporary scoring functions are designed for the virtual screening of small molecules without special optimization for reverse docking, which would be easily influenced by the properties of protein pockets, resulting in scoring bias to the proteins with certain properties...
2017: PloS One
https://www.readbyqxmd.com/read/28194313/off-the-scale-a-new-species-of-fish-scale-gecko-squamata-gekkonidae-geckolepis-with-exceptionally-large-scales
#6
Mark D Scherz, Juan D Daza, Jörn Köhler, Miguel Vences, Frank Glaw
The gecko genus Geckolepis, endemic to Madagascar and the Comoro archipelago, is taxonomically challenging. One reason is its members ability to autotomize a large portion of their scales when grasped or touched, most likely to escape predation. Based on an integrative taxonomic approach including external morphology, morphometrics, genetics, pholidosis, and osteology, we here describe the first new species from this genus in 75 years: Geckolepis megalepissp. nov. from the limestone karst of Ankarana in northern Madagascar...
2017: PeerJ
https://www.readbyqxmd.com/read/28194147/freshwater-recirculating-aquaculture-system-operations-drive-biofilter-bacterial-community-shifts-around-a-stable-nitrifying-consortium-of-ammonia-oxidizing-archaea-and-comammox-nitrospira
#7
Ryan P Bartelme, Sandra L McLellan, Ryan J Newton
Recirculating aquaculture systems (RAS) are unique engineered ecosystems that minimize environmental perturbation by reducing nutrient pollution discharge. RAS typically employ a biofilter to control ammonia levels produced as a byproduct of fish protein catabolism. Nitrosomonas (ammonia-oxidizing), Nitrospira, and Nitrobacter (nitrite-oxidizing) species are thought to be the primary nitrifiers present in RAS biofilters. We explored this assertion by characterizing the biofilter bacterial and archaeal community of a commercial scale freshwater RAS that has been in operation for >15 years...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28190725/metapopulation-tracking-juvenile-penguins-reveals-an-ecosystem-wide-ecological-trap
#8
Richard B Sherley, Katrin Ludynia, Bruce M Dyer, Tarron Lamont, Azwianewi B Makhado, Jean-Paul Roux, Kylie L Scales, Les G Underhill, Stephen C Votier
Climate change and fisheries are transforming the oceans, but we lack a complete understanding of their ecological impact [1-3]. Environmental degradation can cause maladaptive habitat selection, inducing ecological traps with profound consequences for biodiversity [4-6]. However, whether ecological traps operate in marine systems is unclear [7]. Large marine vertebrates may be vulnerable to ecological traps [6], but their broad-scale movements and complex life histories obscure the population-level consequences of habitat selection [8, 9]...
January 30, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28186382/vulnerability-of-european-freshwater-catchments-to-climate-change
#9
Danijela Markovic, Savrina F Carrizo, Oskar Kärcher, Ariane Walz, Jonathan N W David
Climate change is expected to exacerbate the current threats to freshwater ecosystems, yet multifaceted studies on the potential impacts of climate change on freshwater biodiversity at scales that inform management planning are lacking. The aim of this study is to fill this void through the development of a novel framework for assessing climate change vulnerability tailored to freshwater ecosystems. The three dimensions of climate change vulnerability are: 1) exposure to climate change; 2) sensitivity to altered environmental conditions; and 3) resilience potential...
February 10, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28178343/correction-to-fish-or-not-to-fish-factors-at-multiple-scales-affecting-artisanal-fishers-readiness-to-exit-a-declining-fishery
#10
Tim M Daw, Joshua E Cinner, Timothy R McClanahan, Katrina Brown, Selina M Stead, Nicholas A J Graham, Joseph Maina
[This corrects the article DOI: 10.1371/journal.pone.0031460.].
2017: PloS One
https://www.readbyqxmd.com/read/28176029/summarizing-us-wildlife-trade-with-an-eye-toward-assessing-the-risk-of-infectious-disease-introduction
#11
K M Smith, C Zambrana-Torrelio, A White, M Asmussen, C Machalaba, S Kennedy, K Lopez, T M Wolf, P Daszak, D A Travis, W B Karesh
The aim of this study was to characterize the role of the USA in the global exchange of wildlife and describe high volume trade with an eye toward prioritizing health risk assessment questions for further analysis. Here we summarize nearly 14 years (2000-2013) of the most comprehensive data available (USFWS LEMIS system), involving 11 billion individual specimens and an additional 977 million kilograms of wildlife. The majority of shipments contained mammals (27%), while the majority of specimens imported were shells (57%) and tropical fish (25%)...
February 7, 2017: EcoHealth
https://www.readbyqxmd.com/read/28170026/high-genetic-diversity-and-connectivity-in-colossoma-macropomum-in-the-amazon-basin-revealed-by-microsatellite-markers
#12
Paola Fazzi-Gomes, Sávio Guerreiro, Glauber David Almeida Palheta, Nuno Filipe Alves Correa de Melo, Sidney Santos, Igor Hamoy
Colossoma macropomum is the second largest scaled fish of the Amazon. It is economically important for commercial fisheries and for aquaculture, but few studies have examined the diversity and genetic structure of natural populations of this species. The aim of this study was to investigate the levels of genetic variability and connectivity that exist between three natural populations of C. macropomum from the Amazon basin. In total, 247 samples were collected from the municipalities of Tefé, Manaus, and Santarém...
February 6, 2017: Genetics and Molecular Biology
https://www.readbyqxmd.com/read/28169563/collinearity-between-potato-solanum-tuberosum-l-and-wild-relatives-assessed-by-comparative-cytogenetic-mapping
#13
Paola Gaiero, José van de Belt, Francisco Vilaró, M Eric Schranz, Pablo Speranza, Hans de Jong
A major bottleneck to introgressive hybridization is the lack of genome collinearity between the donor (alien) genome and the recipient crop genome. Structural differences between the homeologs may create unbalanced segregation of chromosomes or cause linkage drag. To assess large-scale collinearity between potato and two of its wild relatives (Solanum commersonii and Solanum chacoense), we used BAC-FISH mapping of sequences with known positions on the RH potato map. BAC probes could successfully be hybridized to the S...
November 14, 2016: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28169559/challenges-in-diagnosing-medication-resins-in-surgical-pathology-specimens-a-crystal-clear-review-guide
#14
Raul S Gonzalez, Stephen M Lagana, Oliver Szeto, Christina A Arnold
CONTEXT: -Medication resins, including Kayexalate, sevelamer, and bile acid sequestrants, can be encountered in gastrointestinal tract specimens. Their classic histologic appearances have been well documented, but pathologist recognition of the resins is 75%, patient history is not always available, and atypical morphologic findings are sometimes present. OBJECTIVE: -To offer a succinct overview of resins in the gastrointestinal tract, including typical and atypical appearances, in order to serve as a quick reference guide...
February 7, 2017: Archives of Pathology & Laboratory Medicine
https://www.readbyqxmd.com/read/28168760/models-projecting-the-fate-of-fish-populations-under-climate-change-need-to-be-based-on-valid-physiological-mechanisms
#15
Sjannie Lefevre, David J McKenzie, Göran E Nilsson
Some recent modelling papers projecting fish sizes and catches in a warmer future are based on erroneous assumptions regarding 1) the scaling of gills with body mass and 2) the energetic cost of 'maintenance'. Assumption 1) posits that insurmountable geometric constraints prevent respiratory surface areas from growing as fast as body volume. It is argued that these constraints explain allometric scaling of energy metabolism, whereby larger fish have relatively lower mass specific metabolic rates. Assumption 2) concludes that when fish reach a certain size, basal oxygen demands will not be met, because of assumption 1)...
February 6, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28168029/geographical-differentiation-of-the-euchiloglanis-fish-complex-teleostei-siluriformes-in-the-hengduan-mountain-region-china-phylogeographic-evidence-of-altered-drainage-patterns
#16
Yanping Li, Arne Ludwig, Zuogang Peng
The uplift of the Tibetan Plateau caused significant ecogeographical changes that had a major impact on the exchange and isolation of regional fauna and flora. Furthermore, Pleistocene glacial oscillations were linked to temporal large-scale landmass and drainage system reconfigurations near the Hengduan Mountain Region and might have facilitated speciation and promoted biodiversity in southwestern China. However, strong biotic evidence supporting this role is lacking. Here, we use the Euchiloglanis fish species complex as a model to demonstrate the compound effects of the Tibetan Plateau uplift and Pleistocene glacial oscillations on species formation in this region...
February 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28167074/emerging-pathogens-in-the-fish-farming-industry-and-sequencing-based-pathogen-discovery
#17
Torstein Tengs, Espen Rimstad
The use of large scale DNA/RNA sequencing has become an integral part of biomedical research. Reduced sequencing costs and the availability of efficient computational resources has led to a revolution in how problems concerning genomics and transcriptomics are addressed. Sequencing-based pathogen discovery represents one example of how genetic data can now be used in ways that were previously considered infeasible. Emerging pathogens affect both human and animal health due to a multitude of factors, including globalization, a shifting environment and an increasing human population...
February 3, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28166257/size-matters-predator-outbreaks-threaten-foundation-species-in-small-marine-protected-areas
#18
Cody S Clements, Mark E Hay
The unanticipated impacts of consumers in fragmented habitats are frequently a challenge for ecosystem management. On Indo-Pacific coral reefs, crown-of-thorns sea stars (Acanthaster spp.) are coral predators whose outbreaks cause precipitous coral decline. Across large spatial scales, Acanthaster densities are lower in large no-take Marine Protected Areas (MPAs) and reefs subject to limited human exploitation. However, using a combination of observational and manipulative experiments, we found that Acanthaster densities within a network of small, no-take MPAs on reef flats in Fiji were ~2-3...
2017: PloS One
https://www.readbyqxmd.com/read/28162048/bioconversion-of-fish-solid-waste-into-phb-using-bacillus-subtilis-based-submerged-fermentation-process
#19
S Mohapatra, B Sarkar, D P Samantaray, A Daware, S Maity, S Pattnaik, S Bhattacharjee
Currently, one of the major problem affecting the world is solid waste management predominantly petroleum based plastic and fish solid waste (FSW). However, it is very difficult to reduce the consumption of plastic as well as fish products, but it is promising to convert FSW to biopolymer to reduce eco-pollution. On account of that, the bioconversion of FSW extract to polyhydroxybutyrate (PHB) was under taken by using B. subtilis (KP172548). Under optimized condition 1.62 g/L of PHB have been produced by the bacterium...
February 6, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28160340/phylogeography-of-the-sergeants-abudefduf-sexfasciatus-and-a-vaigiensis-reveals-complex-introgression-patterns-between-two-widespread-and-sympatric-indo-west-pacific-reef-fishes
#20
Joris A M Bertrand, Philippe Borsa, Wei-Jen Chen
On evolutionary time scales, sea level oscillations lead to recurrent spatio-temporal variation in species distribution and population connectivity. In this situation, applying classical concepts of biogeography is challenging yet necessary to understand the mechanisms underlying biodiversity in highly diverse marine ecosystems such as coral reefs. We aimed at studying the outcomes of such complex biogeographical dynamics on reproductive isolation by sampling populations across a wide spatial range of a species-rich fish genus: the sergeants (Pomacentridae: Abudefduf)...
February 3, 2017: Molecular Ecology
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