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https://www.readbyqxmd.com/read/29348515/genetic-evidence-for-panmixia-in-a-colony-breeding-crater-lake-cichlid-fish
#1
T K Lehtonen, K R Elmer, M Lappalainen, A Meyer
Fine-scaled genetic structuring, as seen for example in many lacustrine fish, typically relates to the patterns of migration, habitat use, mating system or other ecological factors. Because the same processes can also affect the propensity of population differentiation and divergence, assessments of species from rapidly speciating clades, or with particularly interesting ecological traits, can be especially insightful. For this study, we assessed the spatial genetic relationships, including the genetic evidence for sex-biased dispersal, in a colony-breeding cichlid fish, Amphilophus astorquii, endemic to Crater Lake Apoyo in Nicaragua, using 11 polymorphic microsatellite loci (n = 123 individuals from three colonies)...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343602/bayesian-inference-reveals-positive-but-subtle-effects-of-experimental-fishery-closures-on-marine-predator-demographics
#2
Richard B Sherley, Barbara J Barham, Peter J Barham, Kate J Campbell, Robert J M Crawford, Jennifer Grigg, Cat Horswill, Alistair McInnes, Taryn L Morris, Lorien Pichegru, Antje Steinfurth, Florian Weller, Henning Winker, Stephen C Votier
Global forage-fish landings are increasing, with potentially grave consequences for marine ecosystems. Predators of forage fish may be influenced by this harvest, but the nature of these effects is contentious. Experimental fishery manipulations offer the best solution to quantify population-level impacts, but are rare. We used Bayesian inference to examine changes in chick survival, body condition and population growth rate of endangered African penguins Spheniscus demersus in response to 8 years of alternating time-area closures around two pairs of colonies...
January 31, 2018: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29342214/correction-large-scale-diversity-of-slope-fishes-pattern-inconsistency-between-multiple-diversity-indices
#3
Jean-Claude Gaertner, Porzia Maiorano, Bastien Mérigot, Francesco Colloca, Chrissi-Yianna Politou, Luis Gil De Sola, Jacques A Bertrand, Matteo Murenu, Jean-Pierre Durbec, Argyris Kallianiotis, Alessandro Mannini
[This corrects the article DOI: 10.1371/journal.pone.0066753.].
2018: PloS One
https://www.readbyqxmd.com/read/29342156/specialized-attachment-structure-of-the-fish-pathogenic-oomycete-saprolegnia-parasitica
#4
Svetlana Rezinciuc, Jose Vladimir Sandoval-Sierra, Yolanda Ruiz-León, Pieter van West, Javier Diéguez-Uribeondo
The secondary cysts of the fish pathogen oomycete Saprolegnia parasitica possess bundles of long hooked hairs that are characteristic to this economically important pathogenic species. Few studies have been carried out on elucidating their specific role in the S. parasitica life cycle and the role they may have in the infection process. We show here their function by employing several strategies that focus on descriptive, developmental and predictive approaches. The strength of attachment of the secondary cysts of this pathogen was compared to other closely related species where bundles of long hooked hairs are absent...
2018: PloS One
https://www.readbyqxmd.com/read/29341366/impact-of-multiple-stressors-on-juvenile-fish-in-estuaries-of-the-northeast-pacific
#5
Jason D Toft, Stuart H Munsch, Jeffery R Cordell, Kiira Siitari, Van C Hare, Brett Holycross, Lisa A DeBruyckere, Correigh M Greene, Brent B Hughes
A key step in identifying global change impacts on species and ecosystems is to quantify effects of multiple stressors. To date, the science of global change has been dominated by regional field studies, experimental manipulation, meta-analyses, conceptual models, reviews, and studies focusing on a single stressor or species over broad spatial and temporal scales. Here, we provide one of the first studies for coastal systems examining multiple stressor effects across broad scales, focused on the nursery function of 20 estuaries spanning 1600 km of coastline, 25 years of monitoring, and seven fish and invertebrate species along the northeast Pacific coast...
January 17, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29339605/enhancing-nitrogen-removal-efficiency-in-a-dyestuff-wastewater-treatment-plant-with-the-iffas-process-the-pilot-scale-and-full-scale-studies
#6
Yanjun Mao, Xie Quan, Huimin Zhao, Yaobin Zhang, Shuo Chen, Tao Liu
The activated sludge (AS) process is widely applied in dyestuff wastewater treatment plants (WWTPs); however, the nitrogen removal efficiency is relatively low and the effluent does not meet the indirect discharge standards before being discharged into the industrial park's WWTP. Hence it is necessary to upgrade the WWTP with more advanced technologies. Moving bed biofilm processes with suspended carriers in an aerobic tank are promising methods due to enhanced nitrification and denitrification. Herein, a pilot-scale integrated free-floating biofilm and activated sludge (IFFAS) process was employed to investigate the feasibility of enhancing nitrogen removal efficiency at different hydraulic retention times (HRTs)...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29335453/engineering-yarrowia-lipolytica-to-simultaneously-produce-lipase-and-single-cell-protein-from-agro-industrial-wastes-for-feed
#7
Jinyong Yan, Bingnan Han, Xiaohua Gui, Guilong Wang, Li Xu, Yunjun Yan, Catherine Madzak, Dujie Pan, Yaofeng Wang, Genhan Zha, Liangcheng Jiao
Lipases are scarcely exploited as feed enzymes in hydrolysis of lipids for increasing energy supply and improving nutrient use efficiency. In this work, we performed homologous overexpression, in vitro characterization and in vivo assessment of a lipase from the yeast Yarrowia lipolytica for feed purpose. Simultaneously, a large amount of yeast cell biomass was produced, for use as single cell protein, a potential protein-rich feed resource. Three kinds of low cost agro-industrial wastes were tested as substrates for simultaneous production of lipase and single cell protein (SCP) as feed additives: sugarcane molasses, waste cooking oil and crude glycerol from biodiesel production...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330801/hypoxic-treatment-of-zebrafish-embryos-and-larvae
#8
Hiroyasu Kamei, Cunming Duan
Zebrafish has emerged as an informative animal model to study the biological impact and molecular mechanisms of hypoxia. Here we describe a simple method to induce hypoxia in zebrafish embryos and larvae. This protocol is easy and reproducible and does not require expensive equipment or specialized devices. It can be adapted in large, medium, and small scales. This protocol is also well-suited for experiments requiring chemical drug treatment and can be applied to other fish and amphibian species.
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29330607/river-continuity-restoration-and-diadromous-fishes-much-more-than-an-ecological-issue
#9
H Drouineau, C Carter, M Rambonilaza, G Beaufaron, G Bouleau, A Gassiat, P Lambert, S le Floch, S Tétard, E de Oliveira
Ecosystem fragmentation is a serious threat to biodiversity and one of the main challenges in ecosystem restoration. River continuity restoration (RCR) has often targeted diadromous fishes, a group of species supporting strong cultural and economic values and especially sensitive to river fragmentation. Yet it has frequently produced mixed results and diadromous fishes remain at very low levels of abundance. Against this background, this paper presents the main challenges for defining, evaluating and achieving effective RCR...
January 12, 2018: Environmental Management
https://www.readbyqxmd.com/read/29326479/artificial-barriers-prevent-genetic-recovery-of-small-isolated-populations-of-a-low-mobility-freshwater-fish
#10
R A Coleman, B Gauffre, A Pavlova, L B Beheregaray, J Kearns, J Lyon, M Sasaki, R Leblois, C Sgro, P Sunnucks
Habitat loss and fragmentation often result in small, isolated populations vulnerable to environmental disturbance and loss of genetic diversity. Low genetic diversity can increase extinction risk of small populations by elevating inbreeding and inbreeding depression, and reducing adaptive potential. Due to their linear nature and extensive use by humans, freshwater ecosystems are especially vulnerable to habitat loss and fragmentation. Although the effects of fragmentation on genetic structure have been extensively studied in migratory fishes, they are less understood in low-mobility species...
January 12, 2018: Heredity
https://www.readbyqxmd.com/read/29326297/current-status-and-future-directions-of-l%C3%A3-vy-walk-research
#11
REVIEW
Andy M Reynolds
Lévy walks are a mathematical construction useful for describing random patterns of movement with bizarre fractal properties that seem to have no place in biology. Nonetheless, movement patterns resembling Lévy walks have been observed at scales ranging from the microscopic to the ecological. They have been seen in the molecular machinery operating within cells during intracellular trafficking, in the movement patterns of T cells within the brain, in DNA, in some molluscs, insects, fish, birds and mammals, in the airborne flights of spores and seeds, and in the collective movements of some animal groups...
January 11, 2018: Biology Open
https://www.readbyqxmd.com/read/29325126/automated-integration-of-trees-and-traits-a-case-study-using-paired-fin-loss-across-teleost-fishes
#12
Laura M Jackson, Pasan C Fernando, Josh S Hanscom, James P Balhoff, Paula M Mabee
Data synthesis required for large-scale macroevolutionary studies is challenging with the current tools available for integration. Using a classic question regarding the frequency of paired fin loss in teleost fishes as a case study, we sought to create automated methods to facilitate the integration of broad-scale trait data with a sizable species-level phylogeny. Similar to the evolutionary pattern previously described for limbs, pelvic and pectoral fin reduction and loss are thought to have occurred independently multiple times in the evolution of fishes...
January 9, 2018: Systematic Biology
https://www.readbyqxmd.com/read/29324887/the-tracked-roaming-transect-and-distance-sampling-methods-increase-the-efficiency-of-underwater-visual-censuses
#13
Alejo J Irigoyen, Irene Rojo, Antonio Calò, Gastón Trobbiani, Noela Sánchez-Carnero, José A García-Charton
Underwater visual census (UVC) is the most common approach for estimating diversity, abundance and size of reef fishes in shallow and clear waters. Abundance estimation through UVC is particularly problematic in species occurring at low densities and/or highly aggregated because of their high variability at both spatial and temporal scales. The statistical power of experiments involving UVC techniques may be increased by augmenting the number of replicates or the area surveyed. In this work we present and test the efficiency of an UVC method based on diver towed GPS, the Tracked Roaming Transect (TRT), designed to maximize transect length (and thus the surveyed area) with respect to diving time invested in monitoring, as compared to Conventional Strip Transects (CST)...
2018: PloS One
https://www.readbyqxmd.com/read/29324740/dietary-intake-and-diabetic-retinopathy-a-systematic-review
#14
Mark Y Z Wong, Ryan E K Man, Eva K Fenwick, Preeti Gupta, Ling-Jun Li, Rob M van Dam, Mary F Chong, Ecosse L Lamoureux
INTRODUCTION: The evidence linking dietary intake with diabetic retinopathy (DR) is growing but unclear. We conducted a systematic review of the association between dietary intake and DR. METHODS: We systematically searched PubMed, Embase, Medline, and the Cochrane Central register of controlled trials, for publications between January 1967 and January 2017 using standardized criteria for diet and DR. Interventional and observational studies investigating micro- and macro-nutrient intakes; food and beverage consumptions; and dietary patterns were included...
2018: PloS One
https://www.readbyqxmd.com/read/29322345/freshwater-shrimps-macrobrachium-depressimanum-and-macrobrachium-jelskii-as-biomonitors-of-hg-availability-in-the-madeira-river-basin-western-amazon
#15
R C F Galvão, I B B Holanda, D P De Carvalho, R Almeida, C M M Souza, L D Lacerda, W R Bastos
Total mercury (THg) concentrations measured in two freshwater shrimp species (Macrobrachium depressimanum and Macrobrachium jelskii) showed a relationship with the location of artisanal and small-scale gold mining (ASGM) from the Madeira River Basin, Western Amazon. Between August 2009 and May 2010, 212 shrimp samples were collected in the confluence of the Madeira River with three of its tributaries (Western Amazon). THg concentration was quantified in the exoskeleton, hepatopancreas and muscle tissue of the shrimps by cold vapor atomic absorption spectrophotometry...
January 10, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29321874/conservation-planning-for-freshwater-marine-carryover-effects-on-chinook-salmon-survival
#16
Jennifer L Gosselin, Richard W Zabel, James J Anderson, James R Faulkner, António M Baptista, Benjamin P Sandford
Experiences of migratory species in one habitat may affect their survival in the next habitat, in what is known as carryover effects. These effects are especially relevant for understanding how freshwater experience affects survival in anadromous fishes. Here, we study the carryover effects of juvenile salmon passage through a hydropower system (Snake and Columbia rivers, northwestern United States). To reduce the direct effect of hydrosystem passage on juveniles, some fishes are transported through the hydrosystem in barges, while the others are allowed to migrate in-river...
January 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29321528/large-scale-ocean-connectivity-and-planktonic-body-size
#17
Ernesto Villarino, James R Watson, Bror Jönsson, Josep M Gasol, Guillem Salazar, Silvia G Acinas, Marta Estrada, Ramón Massana, Ramiro Logares, Caterina R Giner, Massimo C Pernice, M Pilar Olivar, Leire Citores, Jon Corell, Naiara Rodríguez-Ezpeleta, José Luis Acuña, Axayacatl Molina-Ramírez, J Ignacio González-Gordillo, Andrés Cózar, Elisa Martí, José A Cuesta, Susana Agustí, Eugenio Fraile-Nuez, Carlos M Duarte, Xabier Irigoien, Guillem Chust
Global patterns of planktonic diversity are mainly determined by the dispersal of propagules with ocean currents. However, the role that abundance and body size play in determining spatial patterns of diversity remains unclear. Here we analyse spatial community structure - β-diversity - for several planktonic and nektonic organisms from prokaryotes to small mesopelagic fishes collected during the Malaspina 2010 Expedition. β-diversity was compared to surface ocean transit times derived from a global circulation model, revealing a significant negative relationship that is stronger than environmental differences...
January 10, 2018: Nature Communications
https://www.readbyqxmd.com/read/29317757/human-mediated-and-natural-dispersal-of-an-invasive-fish-in-the-eastern-great-lakes
#18
Mattias L Johansson, Bradley A Dufour, Kyle W Wellband, Lynda D Corkum, Hugh J MacIsaac, Daniel D Heath
The globally invasive Round Goby (Neogobius melanostomus) was introduced to the Great Lakes around 1990, spreading widely and becoming the dominant benthic fish in many areas. The speed and scope of this invasion is remarkable and calls into question conventional secondary spread models and scenarios. We utilized nine microsatellites to identify large-scale genetic structure in Round Goby populations in the eastern Great Lakes, and assessed the role of colonization vs. secondary transport and dispersal in developing this structure...
January 10, 2018: Heredity
https://www.readbyqxmd.com/read/29316937/estimate-of-incidence-and-cost-of-recreational-waterborne-illness-on-united-states-surface-waters
#19
Stephanie DeFlorio-Barker, Coady Wing, Rachael M Jones, Samuel Dorevitch
BACKGROUND: Activities such as swimming, paddling, motor-boating, and fishing are relatively common on US surface waters. Water recreators have a higher rate of acute gastrointestinal illness, along with other illnesses including respiratory, ear, eye, and skin symptoms, compared to non-water recreators. The quantity and costs of such illnesses are unknown on a national scale. METHODS: Recreational waterborne illness incidence and severity were estimated using data from prospective cohort studies of water recreation, reports of recreational waterborne disease outbreaks, and national water recreation statistics...
January 9, 2018: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/29315339/bioeconomic-modeling-for-a-small-scale-sea-cucumber-fishery-in-yucatan-mexico
#20
Alvaro Hernández-Flores, Alfonso Cuevas-Jiménez, Alicia Poot-Salazar, Alfonso Condal, Juan Carlos Espinoza-Méndez
Due to the heavy exploitation of holothurians over the last few decades, it is necessary to implement fishing regulations aimed at reversing this situation. Holothurians require specific regulations that take into account their biology and ecology. Their behavior to group and form patches as a strategy for feeding, defense and reproduction, makes them vulnerable to overfishing. The higher the population density, the higher the catchability coefficient, and because they are sedentary organisms, the catchability does not change significantly until the density is very low...
2018: PloS One
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