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https://www.readbyqxmd.com/read/28095487/dna-metabarcoding-of-amazonian-ichthyoplankton-swarms
#1
M E Maggia, Y Vigouroux, J F Renno, F Duponchelle, E Desmarais, J Nunez, C García-Dávila, F M Carvajal-Vallejos, E Paradis, J F Martin, C Mariac
Tropical rainforests harbor extraordinary biodiversity. The Amazon basin is thought to hold 30% of all river fish species in the world. Information about the ecology, reproduction, and recruitment of most species is still lacking, thus hampering fisheries management and successful conservation strategies. One of the key understudied issues in the study of population dynamics is recruitment. Fish larval ecology in tropical biomes is still in its infancy owing to identification difficulties. Molecular techniques are very promising tools for the identification of larvae at the species level...
2017: PloS One
https://www.readbyqxmd.com/read/28093608/spatiotemporal-drivers-of-energy-expenditure-in-a-coastal-marine-fish
#2
Jacob W Brownscombe, Steven J Cooke, Andy J Danylchuk
Animal behavior and energy expenditure often vary significantly across the landscape, and quantifying energy expenditure over space and time provides mechanistic insight into ecological dynamics. Yet, spatiotemporal variability in energy expenditure has rarely been explored in fully aquatic species such as fish. Our objective was to quantify spatially explicit energy expenditure for a tropical marine teleost fish, bonefish (Albula vulpes), to examine how bonefish energetics vary across landscape features and temporal factors...
January 16, 2017: Oecologia
https://www.readbyqxmd.com/read/28087534/mechanisms-of-horizontal-cell-to-cell-transfer-of-wolbachia-spp-in-drosophila-melanogaster
#3
Pamela M White, Jose E Pietri, Alain Debec, Shelbi Russell, Bhavin Patel, William Sullivan
: Wolbachia is an intracellular endosymbiont present in most arthropod and filarial nematode species. Transmission between hosts is primarily vertical, taking place exclusively through the female germline, though horizontal transmission has also been documented. Several studies indicate that Wolbachia is capable of transfer between somatic and germline cells during nematode development and in adult flies. However, the mechanisms underlying horizontal cell-to-cell transfer remain largely unexplored...
January 13, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28073553/the-effects-of-light-intensity-on-the-growth-of-japanese-gambierdiscus-spp-dinophyceae
#4
Takamichi Yoshimatsu, Chaoyu Tie, Haruo Yamaguchi, Hiroshi Funaki, Chiho Honma, Kouki Tanaka, Masao Adachi
Marine toxic dinoflagellates of the genus Gambierdiscus are the causative agents of ciguatera fish poisoning (CFP), a form of seafood poisoning that is widespread in tropical, subtropical and temperate regions worldwide. The distributions of Gambierdiscus australes, Gambierdiscus scabrosus and two phylotypes of Gambierdiscus spp. type 2 and type 3 have been reported for the waters surrounding the main island of Japan. To explore the bloom dynamics and the vertical distribution of these Japanese species and phylotypes of Gambierdiscus, the effects of light intensity on their growth were tested, using a photoirradiation-culture system...
December 2016: Harmful Algae
https://www.readbyqxmd.com/read/28065866/multilocus-molecular-phylogeny-of-the-ornamental-wood-eating-catfishes-siluriformes-loricariidae-panaqolus-and-panaque-reveals-undescribed-diversity-and-parapatric-clades
#5
Nathan K Lujan, Christian A Cramer, Raphael Covain, Sonia Fisch-Muller, Hernán López-Fernández
Approximately two-dozen species in three genera of the Neotropical suckermouth armored catfish family Loricariidae are the only described fishes known to specialize on diets consisting largely of wood. We conducted a molecular phylogenetic analysis of 10 described species and 14 undescribed species or morphotypes assigned to the wood-eating catfish genus Panaqolus, and four described species and three undescribed species or morphotypes assigned to the distantly related wood-eating catfish genus Panaque. Our analyses included individuals and species from both genera that are broadly distributed throughout tropical South America east of the Andes Mountains and 13 additional genera hypothesized to have also descended from the most recent common ancestor of Panaqolus and Panaque...
January 5, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28064319/-main-regulatory-element-mre-of-the-danio-rerio-%C3%AE-%C3%AE-globin-gene-domain-exerts-enhancer-activity-toward-the-promoters-of-the-embryonic-larval-and-adult-globin-genes
#6
A P Kovina, N V Petrova, S V Razin, O V Yarovaia
In warm-blooded vertebrates, the α- and β-globin genes are organized in domains of different types and are regulated in different fashion. In cold-blooded vertebrates and, in particular, the tropical fish Danio rerio, the α- and β-globin genes form two gene clusters. A major D. rerio globin gene cluster is in chromosome 3 and includes the α- and β-globin genes of embryonic-larval and adult types. The region upstream of the cluster contains c16orf35, harbors the main regulatory element (MRE) of the α-globin gene domain in warm-blooded vertebrates...
November 2016: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/28063698/nitrogen-isotopic-characterisation-of-macroalgae-blooms-from-different-sites-within-a-subtropical-bay-in-the-gulf-of-california
#7
Alejandra Piñón-Gimate, Noemi Espinosa-Andrade, Alberto Sánchez, Margarita Casas-Valdez
In La Paz Bay conspicuous macroalgal blooms of Ulva spp. are recurrent in the waterfront of the city; studies relate its growth to seasonality and nutrient enrichment but their relative influence is not known. We use the δ(15)N to discern amongst nitrogen sources at three sites with different substratum and anthropogenic activities. Ulva blooms were monitored monthly at San Juan de la Costa (SJC), Casa del Marino (CM) and El Tecolote (TE). Species presence varied between sites and months. At SJC Ulva displayed the highest signal of δ(15)N associated with fishing products and local mining wastewaters (19...
January 4, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28063102/quantitative-analyses-of-the-bacterial-microbiota-of-rearing-environment-tilapia-and-common-carp-cultured-in-earthen-ponds-and-inhibitory-activity-of-its-lactic-acid-bacteria-on-fish-spoilage-and-pathogenic-bacteria
#8
Pierre Marie Kaktcham, Jules-Bocamdé Temgoua, François Ngoufack Zambou, Gloria Diaz-Ruiz, Carmen Wacher, María de Lourdes Pérez-Chabela
The present study aimed to evaluate the bacterial load of water, Nile Tilapia and common Carp intestines from earthen ponds, isolate lactic acid bacteria (LAB) and assess their antimicrobial activity against fish spoilage and pathogenic bacteria. Following enumeration and isolation of microorganisms the antimicrobial activity of the LAB isolates was evaluated. Taxonomic identification of selected antagonistic LAB strains was assessed, followed by partial characterisation of their antimicrobial metabolites. Results showed that high counts (>4 log c...
February 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28056064/marine-reserve-targets-to-sustain-and-rebuild-unregulated-fisheries
#9
Nils C Krueck, Gabby N Ahmadia, Hugh P Possingham, Cynthia Riginos, Eric A Treml, Peter J Mumby
Overfishing threatens the sustainability of coastal marine biodiversity, especially in tropical developing countries. To counter this problem, about 200 governments worldwide have committed to protecting 10%-20% of national coastal marine areas. However, associated impacts on fisheries productivity are unclear and could weaken the food security of hundreds of millions of people who depend on diverse and largely unregulated fishing activities. Here, we present a systematic theoretic analysis of the ability of reserves to rebuild fisheries under such complex conditions, and we identify maximum reserve coverages for biodiversity conservation that do not impair long-term fisheries productivity...
January 2017: PLoS Biology
https://www.readbyqxmd.com/read/28043553/frequency-of-mycobacterial-infections-in-retailed-fish-in-karaj-an-iranian-perspective
#10
Atefeh Mobasher-Amini, Nader Mosavari, Mehdi Ghiami-Rad, Keyvan Tadayon
OBJECTIVE/BACKGROUND: Mycobacterium species comprise one of the most frequently-reported causative agents in granulomatous lesions of fish. Also, mycobacteria have been documented as fish-born zoonoses. Ornamental aquaria, commercial aquaculture, and wild fisheries therefore produce a potential risk of infection for humans through physical contact and consumption of fishes. A number of fish mycobacteriosis and fish-born zoonotic cases have been reported to date in Iran. METHODS: In order to examine the frequency of mycobacteria existence in fish supplied to the public in seafood retail outlets, whole fresh fish from cold water (n=50) and tropical (n=50) audible fish were obtained from five stores in Karaj, the central city of Alborz province...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28032359/opisthorchis-felineus-negatively-associates-with-skin-test-reactivity-in-russia-europrevall-inco-study
#11
Olga S Fedorova, Jacqueline J Janse, Ludmila M Ogorodova, Marina M Fedotova, Rogier A Achterberg, Jaco J Verweij, Montserrat Fernández-Rivas, Serge A Versteeg, James Potts, Cosetta Minelli, Ronald van Ree, Peter Burney, Maria Yazdanbakhsh
BACKGROUND: Most studies on the relationship between helminth infections and atopic disorders have been conducted in (sub)tropical developing countries where exposure to multiple parasites and lifestyle can confound the relationship. We aimed to study the relationship between infection with the fish-borne helminth Opishorchis felineus and specific IgE, skin prick testing and atopic symptoms in Western-Siberia, with lifestyle and hygiene standards of a developed country. METHODS: Schoolchildren aged 7 to 11 years were sampled from one urban and two rural regions...
December 29, 2016: Allergy
https://www.readbyqxmd.com/read/28004804/distribution-of-herbivorous-fish-is-frozen-by-low-temperature
#12
Ivana Vejříková, Lukáš Vejřík, Jari Syväranta, Mikko Kiljunen, Martin Čech, Petr Blabolil, Mojmír Vašek, Zuzana Sajdlová, Son Hoang The Chung, Marek Šmejkal, Jaroslava Frouzová, Jiří Peterka
The number of herbivores in populations of ectothermic vertebrates decreases with increasing latitude. At higher latitudes, fish consuming plant matter are exclusively omnivorous. We assess whether omnivorous fish readily shift to herbivory or whether animal prey is typically preferred. We address temperature as the key factor causing their absence at higher latitudes and discuss the potential poleward dispersion caused by climate changes. A controlled experiment illustrates that rudd (Scardinius erythrophthalmus) readily utilize plant matter at water temperatures above 20 °C and avoid its consumption below 20 °C...
December 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28004635/host-specificity-and-the-structure-of-helminth-parasite-communities-of-fishes-in-a-neotropical-river-in-mexico
#13
Guillermo Salgado-Maldonado, María Teresa Novelo-Turcotte, Juan Manuel Caspeta-Mandujano, Gabriela Vazquez-Hurtado, Benjamin Quiroz-Martínez, Norman Mercado-Silva, Mario Favila
In a tropical locality of Río La Antigua, Veracruz, Mexico, 11 fish species, represented by 244 individual fish from six freshwater fish families living sympatrically and synchronically, were examined for helminth parasites. A total of 36 taxa of helminths were recorded, 24 autogenic and 12 allogenic forms, including 6 monogeneans, 14 trematodes, 1 cestode, and 15 nematodes. Most helminth taxa were recovered for 10/11 of the component communities we analyzed. The results contribute empirical evidence that host specificity is an important force in the development of helminth communities of freshwater fishes...
2016: Parasite: Journal de la Société Française de Parasitologie
https://www.readbyqxmd.com/read/28000368/extensions-of-island-biogeography-theory-predict-the-scaling-of-functional-trait-composition-with-habitat-area-and-isolation
#14
Claire Jacquet, David Mouillot, Michel Kulbicki, Dominique Gravel
The Theory of Island Biogeography (TIB) predicts how area and isolation influence species richness equilibrium on insular habitats. However, the TIB remains silent about functional trait composition and provides no information on the scaling of functional diversity with area, an observation that is now documented in many systems. To fill this gap, we develop a probabilistic approach to predict the distribution of a trait as a function of habitat area and isolation, extending the TIB beyond the traditional species-area relationship...
December 21, 2016: Ecology Letters
https://www.readbyqxmd.com/read/28000069/does-turbidity-induced-by-carassius-carassius-limit-phytoplankton-growth-a-mesocosm-study
#15
Hu He, En Hu, Jinlei Yu, Xuguang Luo, Kuanyi Li, Erik Jeppesen, Zhengwen Liu
It is well established that benthivorous fish in shallow lakes can create turbid conditions that influence phytoplankton growth both positively, as a result of elevated nutrient concentration in the water column, and negatively, due to increased attenuation of light. The net effect depends upon the degree of turbidity induced by the benthivores. Stocked Carassius carassius dominate the benthivorous fish fauna in many nutrient-rich Chinese subtropical and tropical shallow lakes, but the role of the species as a potential limiting factor in phytoplankton growth is ambiguous...
December 20, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27990290/tropical-fish-in-a-warming-world-thermal-tolerance-of-nile-perch-lates-niloticus-l-in-lake-nabugabo-uganda
#16
Emmanuelle Chrétien, Lauren J Chapman
Key to predicting the response of fishes to climate change is quantifying how close fish are to their critical thermal limits in nature and their ability to adjust their thermal sensitivity to maintain performance. Here, we evaluated the effects of body size and habitat on aerobic scope (AS) and thermal tolerance of Nile perch Lates niloticus (L.), a fish of great economic and food security importance in East Africa, using respirometry and critical thermal maximum (CTmax) trials. Juvenile Nile perch from distinct habitats (high or low dissolved oxygen concentrations) of Lake Nabugabo, Uganda were exposed for 4...
2016: Conservation Physiology
https://www.readbyqxmd.com/read/27989632/molecular-phylogeny-and-patterns-of-diversification-in-syngnathid-fishes
#17
Healy Hamilton, Norah Saarman, Graham Short, Anna B Sellas, Beth Moore, Tinya Hoang, Christopher L Grace, Martin Gomon, Karen Crow, W Brian Simison
The family Syngnathidae is a large and diverse clade of morphologically unique bony fishes, with 57 genera and 300 described species of seahorses, pipefishes, pipehorses, and seadragons. They primarily inhabit shallow coastal waters in temperate and tropical oceans, and are characterized by a fused jaw, male brooding, and extraordinary crypsis. Phylogenetic relationships within the Syngnathidae remain poorly resolved due to lack of generic taxon sampling, few diagnostic morphological characters, and limited molecular data...
October 29, 2016: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/27984648/seasonal-changes-in-the-assembly-mechanisms-structuring-tropical-fish-communities
#18
Daniel B Fitzgerald, Kirk O Winemiller, Mark H Sabaj Pérez, Leandro M Sousa
Despite growing interest in trait-based approaches to community assembly, little attention has been given to seasonal variation in trait distribution patterns. Mobile animals can rapidly mediate influences of environmental factors and species interactions through dispersal, suggesting that the relative importance of different assembly mechanisms can vary over short time scales. This study analyzes seasonal changes in functional trait distributions of tropical fishes in the Xingu River, a major tributary of the Amazon with large predictable temporal variation in hydrologic conditions and species density...
October 6, 2016: Ecology
https://www.readbyqxmd.com/read/27969548/investigating-copper-toxicity-in-the-tropical-fish-cardinal-tetra-paracheirodon-axelrodi-in-natural-amazonian-waters-measurements-modeling-and-reality
#19
Anne Crémazy, Chris M Wood, D Scott Smith, Márcio S Ferreira, Ora E Johannsson, Marina Giacomin, Adalberto L Val
Copper at high concentrations is an ionoregulatory toxicant in fish and its toxicity is known to be strongly modulated by the water chemistry. The toxicity of Cu to the tropical fish cardinal tetra (Paracheirodon axelrodi) was investigated in waters from two major rivers of the Amazon watershed: the Rio Negro (filtered <0.45μm, pH 5.6, DOC=8.4 mgL(-1), Na=33μM, Ca=8μM) and the Rio Solimões (filtered <0.45μm, pH 6.7, DOC=2.8 mgL(-1), Na=185μM, Ca=340μM), as well as in a natural "reference water" (groundwater) which was almost DOC-free (pH 6...
October 17, 2016: Aquatic Toxicology
https://www.readbyqxmd.com/read/27959907/assessing-caribbean-shallow-and-mesophotic-reef-fish-communities-using-baited-remote-underwater-video-bruv-and-diver-operated-video-dov-survey-techniques
#20
Dominic A Andradi-Brown, Consuelo Macaya-Solis, Dan A Exton, Erika Gress, Georgina Wright, Alex D Rogers
Fish surveys form the backbone of reef monitoring and management initiatives throughout the tropics, and understanding patterns in biases between techniques is crucial if outputs are to address key objectives optimally. Often biases are not consistent across natural environmental gradients such as depth, leading to uncertainty in interpretation of results. Recently there has been much interest in mesophotic reefs (reefs from 30-150 m depth) as refuge habitats from fishing pressure, leading to many comparisons of reef fish communities over depth gradients...
2016: PloS One
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