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https://www.readbyqxmd.com/read/28535116/is-mannitol-the-treatment-of-choice-for-patients-with-ciguatera-fish-poisoning
#1
Michael E Mullins, Robert S Hoffman
CONTEXT: Ciguatera fish poisoning arises primarily from consumption of carnivorous reef fish caught in tropical and sub-tropical waters. Ciguatoxins, a class of tasteless, heat-stable, polycyclic toxins produced by dinoflagellates, accumulate through the food chain and concentrate in various carnivorous fish, such as groupers, barracudas, wrasses, amberjack, kingfishes, and eels. Characteristics of ciguatera fish poisoning include early nausea, vomiting, and diarrhea in the first one to two days post ingestion, followed by the appearance of sensory disturbances...
May 23, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28526119/effects-of-temperature-salinity-and-composition-of-the-dinoflagellate-assemblage-on-the-growth-of-gambierdiscus-carpenteri-isolated-from-the-great-barrier-reef
#2
Leanne Sparrow, Paolo Momigliano, Garry R Russ, Kirsten Heimann
Increases in reported incidence of ciguatera fish poisoning (hereafter ciguatera) have been linked to warmer sea temperatures that are known to trigger coral bleaching events. The drivers that trigger blooms of ciguatera-causing dinoflagellates on the Great Barrier Reef (GBR) are poorly understood. This study investigated the effects of increased temperatures and lowered salinities, often associated with environmental disturbance events, on the population growth of two strains of the potentially ciguatera-causing dinoflagellate, Gambierdiscus carpenteri (NQAIF116 and NQAIF380)...
May 2017: Harmful Algae
https://www.readbyqxmd.com/read/28515171/mutualistic-damselfish-induce-higher-photosynthetic-rates-in-their-host-coral
#3
Nur Garcia-Herrera, Sebastian C A Ferse, Andreas Kunzmann, Amatzia Genin
Coral reefs are amongst the most diverse ecosystems on Earth where complex inter-specific interactions are ubiquitous. An example of such interactions is the mutualistic relationship between damselfishes and branching corals in the Northern Red Sea, where the fish use corals as shelter and provide them with nutrients, enhance the flow between their branches, and protect them from predators. By enhancing the flow between the coral branches, the fish ventilate the coral's inner zone, mitigating hypoxic conditions that otherwise develop within that zone during the night...
May 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28514632/a-waterborne-pursuit-deterrent-signal-deployed-by-a-sea-urchin
#4
Hannah Sheppard-Brennand, Alistair G B Poore, Symon A Dworjanyn
Selection by consumers has led to the evolution of a vast array of defenses in animals and plants. These defenses include physical structures, behaviors, and chemical signals that mediate interactions with predators. Some of the strangest defensive structures in nature are the globiferous pedicellariae of the echinoderms. These are small venomous appendages with jaws and teeth that cover the test of many sea urchins and sea stars. In this study, we report a unique use of these defensive structures by the collector sea urchin Tripneustes gratilla...
June 2017: American Naturalist
https://www.readbyqxmd.com/read/28489903/atoll-scale-patterns-in-coral-reef-community-structure-human-signatures-on-ulithi-atoll-micronesia
#5
Nicole L Crane, Peter Nelson, Avigdor Abelson, Kristin Precoda, John Rulmal, Giacomo Bernardi, Michelle Paddack
The dynamic relationship between reefs and the people who utilize them at a subsistence level is poorly understood. This paper characterizes atoll-scale patterns in shallow coral reef habitat and fish community structure, and correlates these with environmental characteristics and anthropogenic factors, critical to conservation efforts for the reefs and the people who depend on them. Hierarchical clustering analyses by site for benthic composition and fish community resulted in the same 3 major clusters: cluster 1-oceanic (close proximity to deep water) and uninhabited (low human impact); cluster 2-oceanic and inhabited (high human impact); and cluster 3-lagoonal (facing the inside of the lagoon) and inhabited (highest human impact)...
2017: PloS One
https://www.readbyqxmd.com/read/28486509/combining-participatory-and-socioeconomic-approaches-to-map-fishing-effort-in-small-scale-fisheries
#6
Lauric Thiault, Antoine Collin, Frédérique Chlous, Stefan Gelcich, Joachim Claudet
Mapping the spatial allocation of fishing effort while including key stakeholders in the decision making process is essential for effective fisheries management but is difficult to implement in complex small-scale fisheries that are diffuse, informal and multifaceted. Here we present a standardized but flexible approach that combines participatory mapping approaches (fishers' spatial preference for fishing grounds, or fishing suitability) with socioeconomic approaches (spatial extrapolation of social surrogates, or fishing capacity) to generate a comprehensive map of predicted fishing effort...
2017: PloS One
https://www.readbyqxmd.com/read/28484634/comparative-behavioural-observations-demonstrate-the-cleaner-shrimp-periclimenes-yucatanicus-engages-in-true-symbiotic-cleaning-interactions
#7
Benjamin M Titus, Clayton Vondriska, Marymegan Daly
Cleaner shrimps are ecologically important members of coral reef communities, but for many species, cleaner status (i.e. dedicated, facultative and mimic), clientele and ecological role remain unverified or described. On Caribbean coral reefs, the spotted 'cleaner' shrimp Periclimenes yucatanicus forms symbioses with sea anemones that may serve as cleaning stations for reef fishes. The status of this species as a cleaner is ambiguous: only a single in situ cleaning interaction has been reported, and in the only test of its efficacy as a cleaner, it did not effectively reduce parasite loads from surgeonfish...
April 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28477434/genomic-analysis-of-a-cardinalfish-with-larval-homing-potential-reveals-genetic-admixture-in-the-okinawa-islands
#8
A L Gould, P V Dunlap
Discrepancies between potential and observed dispersal distances of reef fish indicate the need for a better understanding of the influence of larval behavior on recruitment and dispersal. Population genetic studies can reveal the degree to which populations are connected, providing insight on these patterns, and the development of restriction site associated sequencing (RAD-Seq) methods has made the study of non-model organisms more accessible. We applied double digest RAD-Seq methods to test for population differentiation in the coral reef-dwelling cardinalfish, Siphamia tubifer, which based on behavioral studies, have the potential to use navigational cues to return to natal reefs...
May 6, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28466482/msec-queryable-global-layers-of-environmental-and-anthropogenic-variables-for-marine-ecosystem-studies
#9
Lauren A Yeager, Philippe Marchand, David A Gill, Julia K Baum, Jana M McPherson
Biophysical conditions, including climate, environmental stress, and habitat availability, are key drivers of many ecological processes (e.g., community assembly and productivity) and associated ecosystem services (e.g., carbon sequestration and fishery production). Furthermore, anthropogenic impacts such as coastal development and fishing can have drastic effects on the structure and function of marine ecosystems. Scientists need to account for environmental variation and human impacts to accurately model, manage, and conserve marine ecosystems...
May 3, 2017: Ecology
https://www.readbyqxmd.com/read/28464469/phylogenetic-perspectives-on-reef-fish-functional-traits
#10
Sergio R Floeter, Mariana G Bender, Alexandre C Siqueira, Peter F Cowman
Functional traits have been fundamental to the evolution and diversification of entire fish lineages on coral reefs. Yet their relationship with the processes promoting speciation, extinction and the filtering of local species pools remains unclear. We review the current literature exploring the evolution of diet, body size, water column use and geographic range size in reef-associated fishes. Using published and new data, we mapped functional traits on to published phylogenetic trees to uncover evolutionary patterns that have led to the current functional diversity of fishes on coral reefs...
May 2, 2017: Biological Reviews of the Cambridge Philosophical Society
https://www.readbyqxmd.com/read/28447373/avoiding-a-crisis-of-motivation-for-ocean-management-under-global-environmental-change
#11
REVIEW
Peter J Mumby, James N Sanchirico, Kenneth Broad, Michael W Beck, Peter Tyedmers, Megan Morikawa, Thomas A Okey, Larry B Crowder, Elizabeth A Fulton, Denny Kelso, Joanie A Kleypas, Stephan B Munch, Polita Glynn, Kathryn Matthews, Jane Lubchenco
Climate change and ocean acidification are altering marine ecosystems and, from a human perspective, creating both winners and losers. Human responses to these changes are complex, but may result in reduced government investments in regulation, resource management, monitoring and enforcement. Moreover, a lack of peoples' experience of climate change may drive some towards attributing the symptoms of climate change to more familiar causes such as management failure. Taken together, we anticipate that management could become weaker and less effective as climate change continues...
April 27, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28445546/a-coral-algal-phase-shift-in-mesoamerica-not-driven-by-changes-in-herbivorous-fish-abundance
#12
Jesús Ernesto Arias-González, Tak Fung, Robert M Seymour, Joaquín Rodrigo Garza-Pérez, Gilberto Acosta-González, Yves-Marie Bozec, Craig R Johnson
Coral-algal phase shifts in which coral cover declines to low levels and is replaced by algae have often been documented on coral reefs worldwide. This has motivated coral reef management responses that include restriction and regulation of fishing, e.g. herbivorous fish species. However, there is evidence that eutrophication and sedimentation can be at least as important as a reduction in herbivory in causing phase shifts. These threats arise from coastal development leading to increased nutrient and sediment loads, which stimulate algal growth and negatively impact corals respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28444302/draft-genome-of-the-lined-seahorse-hippocampus-erectus
#13
Qiang Lin, Ying Qiu, Ruobo Gu, Meng Xu, Jia Li, Chao Bian, Huixian Zhang, Geng Qin, Yanhong Zhang, Wei Luo, Jieming Chen, Xinxin You, Mingjun Fan, Min Sun, Pao Xu, Byrappa Venkatesh, Junming Xu, Hongtuo Fu, Qiong Shi
Background: The lined seahorse, Hippocampus erectus , is an Atlantic species and mainly inhabits shallow sea-beds or coral reefs. It has become very popular in China for its wide use in traditional Chinese medicine. In order to improve the aquaculture yield of this valuable fish species, we are trying to develop genomic resources for assistant selection in genetic breeding. Here, we provide whole genome sequencing, assembly and gene annotation of the lined seahorse, which can enrich genome resource and further application for its molecular breeding...
April 22, 2017: GigaScience
https://www.readbyqxmd.com/read/28432153/comparison-of-functional-and-anatomical-estimations-of-visual-acuity-in-two-species-of-coral-reef-fish
#14
Amira N Parker, Kerstin A Fritsches, Cait Newport, Guy Wallis, Ulrike E Siebeck
The high contrast, complex patterns typical of many reef fish serve several purposes, including providing disruptive camouflage and a basis for vision-based communication. In trying to understand the role of a specific pattern it is important to first assess the extent to which an observer can resolve the pattern, itself determined, at least in part, by the observer's visual acuity. In this study, we study the visual acuity of two species of reef fish using both anatomical and behavioural estimates. The two species in question share a common habitat but are members of different trophic levels (predator vs...
April 21, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28431143/characterisation-of-the-gill-mucosal-bacterial-communities-of-four-butterflyfish-species-a-reservoir-of-bacterial-diversity-in-coral-reefs-ecosystems
#15
Miriam Reverter, Pierre Sasal, N Tapissier-Bontemps, D Lecchini, Suzuki M
While recent studies have suggested that fish mucus microbiota play an important role in homeostasis and prevention of infections, very few studies have investigated the bacterial communities of gill mucus. We characterised the gill mucus bacterial communities of four butterflyfish species and although the bacterial diversity of gill mucus varied significantly between species, Shannon diversities were high (H = 3.7 - 5.7) in all species. Microbiota composition differed between butterflyfishes, with Chaetodon lunulatus and C...
April 18, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28428853/coral-reef-mesopredators-switch-prey-shortening-food-chains-in-response-to-habitat-degradation
#16
Tessa N Hempson, Nicholas A J Graham, M Aaron MacNeil, David H Williamson, Geoffrey P Jones, Glenn R Almany
Diet specificity is likely to be the key predictor of a predator's vulnerability to changing habitat and prey conditions. Understanding the degree to which predatory coral reef fishes adjust or maintain prey choice, in response to declines in coral cover and changes in prey availability, is critical for predicting how they may respond to reef habitat degradation. Here, we use stable isotope analyses to characterize the trophic structure of predator-prey interactions on coral reefs of the Keppel Island Group on the southern Great Barrier Reef, Australia...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28425096/influence-of-coral-cover-and-structural-complexity-on-the-accuracy-of-visual-surveys-of-coral-reef-fish-communities
#17
D J Coker, J P Nowicki, N A J Graham
Using manipulated patch reefs with combinations of varying live-coral cover (low, medium and high) and structural complexity (low and high), common community metrics (abundance, diversity, richness and community composition) collected through standard underwater visual census techniques were compared with exhaustive collections using a fish anaesthetic (clove oil). This study showed that reef condition did not influence underwater visual census estimates at a community level, but reef condition can influence the detectability of some small and cryptic species and this may be exacerbated if surveys are conducted on a larger scale...
April 19, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28424344/mutualistic-cleaner-fish-maintains-high-escape-performance-despite-privileged-relationship-with-predators
#18
Simon Gingins, Dominique G Roche, Redouan Bshary
Predatory reef fishes regularly visit mutualistic cleaner fish (Labroides dimidiatus) to get their ectoparasites removed but show no interest in eating them. The concept of compensated trait loss posits that characters can be lost if a mutualistic relationship reduces the need for a given trait. Thus, selective pressures on escape performance might have relaxed in L. dimidiatus due to its privileged relationship with predators. However, the cost of failing to escape a predatory strike is extreme even if predation events on cleaners are exceptionally rare...
April 26, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28422965/diet-and-condition-of-mesopredators-on-coral-reefs-in-relation-to-shark-abundance
#19
Shanta C Barley, Mark G Meekan, Jessica J Meeuwig
Reef sharks may influence the foraging behaviour of mesopredatory teleosts on coral reefs via both risk effects and competitive exclusion. We used a "natural experiment" to test the hypothesis that the loss of sharks on coral reefs can influence the diet and body condition of mesopredatory fishes by comparing two remote, atoll-like reef systems, the Rowley Shoals and the Scott Reefs, in northwestern Australia. The Rowley Shoals are a marine reserve where sharks are abundant, whereas at the Scott Reefs numbers of sharks have been reduced by centuries of targeted fishing...
2017: PloS One
https://www.readbyqxmd.com/read/28411315/contamination-of-marine-fauna-by-chlordecone-in-guadeloupe-evidence-of-a-seaward-decreasing-gradient
#20
Charlotte R Dromard, Mathilde Guéné, Yolande Bouchon-Navaro, Soazig Lemoine, Sébastien Cordonnier, Claude Bouchon
Chlordecone is an organochlorine pesticide, used in the Lesser Antilles from 1972 to 1993 to fight against a banana weevil. That molecule is very persistent in the natural environment and ends up in the sea with runoff waters. The objective of the present study is to evaluate the level of contamination in several trophic groups of marine animals according to their distance from the source of pollution. Samples of suspended matter, macroalgae, herbivorous fishes, detrivorous crustaceans, zooplanktivorous fishes, first- and second-order of carnivorous fishes, and piscivorous fishes have been collected in two sites, located downstream the contaminated sites (Goyave and Petit-Bourg), in three marine habitats (coastal mangroves, seagrass beds located 1...
April 14, 2017: Environmental Science and Pollution Research International
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