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https://www.readbyqxmd.com/read/29334689/-stick-with-your-own-kind-or-hang-with-the-locals-implications-of-shoaling-strategy-for-tropical-reef-fish-on-a-range-expansion-frontline
#1
Shannen M Smith, Rebecca J Fox, David J Booth, Jennifer M Donelson
Range shifts of tropical marine species to temperate latitudes are predicted to increase as a consequence of climate change. To date, the research focus on climate-mediated range shifts has been predominately dealt with the physiological capacity of tropical species to cope with the thermal challenges imposed by temperate latitudes. Behavioural traits of individuals in the novel temperate environment have not previously been investigated, however, they are also likely to play a key role in determining the establishment success of individual species at the range-expansion forefront...
January 15, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29307507/multilocus-phylogeny-divergence-times-and-a-major-role-for-the-benthic-to-pelagic-axis-in-the-diversification-of-grunts-haemulidae
#2
Jose Tavera, Arturo Acero P, Peter C Wainwright
We present a phylogenetic analysis with divergence time estimates, and an ecomorphological assessment of the role of the benthic-to-pelagic axis of diversification in the history of haemulid fishes. Phylogenetic analyses were performed on 97 grunt species based on sequence data collected from seven loci. Divergence time estimation indicates that Haemulidae originated during the mid Eocene (54.7-42.3 Ma) but that the major lineages were formed during the mid-Oligocene 30-25 Ma. We propose a new classification that reflects the phylogenetic history of grunts...
January 4, 2018: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/29306662/ciguatoxins-activate-the-calcineurin-signalling-pathway-in-yeasts-potential-for-development-of-an-alternative-detection-tool
#3
Hélène Martin-Yken, Camille Gironde, Sylvain Derick, Hélène Taiana Darius, Christophe Furger, Dominique Laurent, Mireille Chinain
Ciguatoxins (CTXs) are lipid-soluble polyether compounds produced by dinoflagellates from the genus Gambierdiscus spp. typically found in tropical and subtropical zones. This endemic area is however rapidly expanding due to environmental perturbations, and both toxic Gambierdiscus spp. and ciguatoxic fishes have been recently identified in the North Atlantic Ocean (Madeira and Canary islands) and Mediterranean Sea. Ciguatoxins bind to Voltage Gated Sodium Channels on the membranes of sensory neurons, causing Ciguatera Fish Poisoning (CFP) in humans, a disease characterized by a complex array of gastrointestinal, neurological, neuropsychological, and cardiovascular symptoms...
January 4, 2018: Environmental Research
https://www.readbyqxmd.com/read/29301247/toxicology-of-gambierdiscus-spp-dinophyceae-from-tropical-and-temperate-australian-waters
#4
Michaela E Larsson, Olivier F Laczka, D Tim Harwood, Richard J Lewis, S W A Himaya, Shauna A Murray, Martina A Doblin
Ciguatera Fish Poisoning (CFP) is a human illness caused by the consumption of marine fish contaminated with ciguatoxins (CTX) and possibly maitotoxins (MTX), produced by species from the benthic dinoflagellate genus Gambierdiscus. Here, we describe the identity and toxicology of Gambierdiscus spp. isolated from the tropical and temperate waters of eastern Australia. Based on newly cultured strains, we found that four Gambierdiscus species were present at the tropical location, including G. carpenteri, G. lapillus and two others which were not genetically identical to other currently described species within the genus, and may represent new species...
January 1, 2018: Marine Drugs
https://www.readbyqxmd.com/read/29291060/environmental-influences-and-ontogenetic-differences-in-vertical-habitat-use-of-black-marlin-istiompax-indica-in-the-southwestern-pacific
#5
Samuel M Williams, Bonnie J Holmes, Sean R Tracey, Julian G Pepperell, Michael L Domeier, Michael B Bennett
The black marlin (Istiompax indica) is a highly migratory billfish that occupies waters throughout the tropical and subtropical Indo-Pacific. To characterize the vertical habitat use of I. indica, we examined the temperature-depth profiles collected using 102 pop-up satellite archival tags deployed off the east coast of Australia. Modelling of environmental variables revealed location, sea-surface height deviation, mixed layer depth and dissolved oxygen to all be significant predictors of vertical habitat use...
November 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29245681/philometrid-nematodes-philometridae-of-marine-teleosts-from-balinese-waters-indonesia-including-the-description-of-i-philometra-i-i-damriyasai-i-sp-nov
#6
Kartika Dewi, Harry W Palm
Based on light and scanning electron microscopy, one new species of philometrid nematodes, Philometra damriyasai sp. nov. (Nematoda: Dracunculoidea: Philometridae) from the body cavity of Tylerius spinosissimus (Regan, 1908) (Tetraodontiformes, Tetraodontidae), and five known species are reported in different marine teleosts from South Bali, Indonesia. The new species can be distinguished from the most closely related P. javensis Moravec, Walter & Juniar, 2012 by the absence of sclerotized denticles on the cuticle of the anterior oesophageal lobes of the mouth and smaller larvae...
November 1, 2017: Zootaxa
https://www.readbyqxmd.com/read/29244845/diet-and-stable-isotope-analyses-reveal-the-feeding-ecology-of-the-orangeback-squid-sthenoteuthis-pteropus-steenstrup-1855-mollusca-ommastrephidae-in-the-eastern-tropical-atlantic
#7
Véronique Merten, Bernd Christiansen, Jamileh Javidpour, Uwe Piatkowski, Oscar Puebla, Rebeca Gasca, Henk-Jan T Hoving
In the eastern tropical Atlantic, the orangeback flying squid Sthenoteuthis pteropus (Steenstrup 1855) (Cephalopoda, Ommastrephidae) is a dominant species of the epipelagic nekton community. This carnivore squid has a short lifespan and is one of the fastest-growing squids. In this study, we characterise the role of S. pteropus in the pelagic food web of the eastern tropical Atlantic by investigating its diet and the dynamics of its feeding habits throughout its ontogeny and migration. During three expeditions in the eastern tropical Atlantic in 2015, 129 specimens were caught by hand jigging...
2017: PloS One
https://www.readbyqxmd.com/read/29236703/rural-protein-insufficiency-in-a-wildlife-depleted-west-african-farm-forest-landscape
#8
Björn Schulte-Herbrüggen, Guy Cowlishaw, Katherine Homewood, J Marcus Rowcliffe
INTRODUCTION: Wildlife is an important source of protein for many people in developing countries. Yet wildlife depletion due to overexploitation is common throughout the humid tropics and its effect on protein security, especially for vulnerable households, is poorly understood. This is problematic for both sustainable rural development and conservation management. METHODS: This study investigates a key dimension of protein security in a cash-crop farming community living in a wildlife-depleted farm-forest landscape in SW Ghana, a region where protein-energy malnutrition persists...
2017: PloS One
https://www.readbyqxmd.com/read/29228349/genome-wide-snps-identify-limits-to-connectivity-in-the-extreme-freshwater-disperser-spangled-perch-leiopotherapon-unicolor-terapontidae
#9
Daniel J Schmidt, Joel A Huey, Jane M Hughes
The utility of restriction-site associated DNA sequencing (RADseq) to resolve fine-scale population structure was tested on an abundant and vagile fish species in a tropical river. Australia's most widespread freshwater fish, the "extreme disperser" Leiopotherapon unicolor was sampled from six locations in an unregulated system, the Daly River in Australia's Northern Territory. Despite an expectation of high connectivity based on life history knowledge of this species derived from arid zone habitats, L. unicolor was not a panmictic population in the tropical lower Daly...
November 11, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29222941/characterization-of-the-spoilage-potential-of-pure-and-mixed-cultures-of-bacterial-species-isolated-from-tropical-yellowfin-tuna-thunnus-albacares
#10
Adèle Silbande, Josiane Cornet, Mireille Cardinal, Frédérique Chevalier, Katia Rochefort, Juliette Smith-Ravin, Sandra Adenet, Françoise Leroi
AIM: The spoilage potential of 28 bacterial strains isolated from spoiled raw yellowfin tuna was evaluated. METHODS AND RESULTS: Bacterial species were inoculated in irradiated tuna matrix. Chemical changes, bacterial growth and sensory quality were monitored during aerobic storage at 8°C. Pseudomonas spp., Enterobacter spp. and Escherichia hermanii had no spoiling effect. Brochothrix thermosphacta and Carnobacterium divergens/maltaromaticum developed moderate unpleasant odors...
December 9, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29222047/clown-knifefish-chitala-ornata-oxygen-uptake-and-its-partitioning-in-present-and-future-temperature-environments
#11
Dang Diem Tuong, Tran Bao Ngoc, Vo Thi Nhu Huynh, Do Thi Thanh Huong, Nguyen Thanh Phuong, Tran Ngoc Hai, Tobias Wang, Mark Bayley
It has been argued that tropical ectotherms are more vulnerable to the projected temperature increases than their temperate relatives, because they already live closer to their upper temperature limit. Here we examine the effects of a temperature increase in environmental temperature to 6°C above the present day median temperature (27°C) in the freshwater air-breathing fish Chitala ornata, on aspects of its respiratory physiology in both normoxia and in hypoxia. We found no evidence of respiratory impairment with elevated temperature...
December 5, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/29217541/designing-river-flows-to-improve-food-security-futures-in-the-lower-mekong-basin
#12
J L Sabo, A Ruhi, G W Holtgrieve, V Elliott, M E Arias, Peng Bun Ngor, T A Räsänen, So Nam
Rivers provide unrivaled opportunity for clean energy via hydropower, but little is known about the potential impact of dam-building on the food security these rivers provide. In tropical rivers, rainfall drives a periodic flood pulse fueling fish production and delivering nutrition to more than 150 million people worldwide. Hydropower will modulate this flood pulse, thereby threatening food security. We identified variance components of the Mekong River flood pulse that predict yield in one of the largest freshwater fisheries in the world...
December 8, 2017: Science
https://www.readbyqxmd.com/read/29216194/partitioning-no-take-marine-reserve-ntmr-and-benthic-habitat-effects-on-density-of-small-and-large-bodied-tropical-wrasses
#13
Garry R Russ, Jake R Lowe, Justin R Rizzari, Brock J Bergseth, Angel C Alcala
No-take marine reserves (NTMRs) are increasingly implemented for fisheries management and biodiversity conservation. Yet, assessing NTMR effectiveness depends on partitioning the effects of NTMR protection and benthic habitat on protected species. Such partitioning is often difficult, since most studies lack well-designed sampling programs (i.e. Before-After-Control-Impact-Pair designs) spanning long-term time scales. Spanning 31 years, this study quantifies the effects of NTMR protection and changes to benthic habitat on the density of tropical wrasses (F...
2017: PloS One
https://www.readbyqxmd.com/read/29206219/long-term-monitoring-of-coral-reef-fish-assemblages-in-the-western-central-pacific
#14
Adel Heenan, Ivor D Williams, Tomoko Acoba, Annette DesRochers, Randall K Kosaki, Troy Kanemura, Marc O Nadon, Russell E Brainard
Throughout the tropics, coral reef ecosystems, which are critically important to people, have been greatly altered by humans. Differentiating human impacts from natural drivers of ecosystem state is essential to effective management. Here we present a dataset from a large-scale monitoring program that surveys coral reef fish assemblages and habitats encompassing the bulk of the US-affiliated tropical Pacific, and spanning wide gradients in both natural drivers and human impact. Currently, this includes >5,500 surveys from 39 islands and atolls in Hawaii (including the main and Northwestern Hawaiian Islands) and affiliated geo-political regions of American Samoa, the Commonwealth of the Northern Mariana Islands, Guam, and the Pacific Remote Islands Areas...
December 5, 2017: Scientific Data
https://www.readbyqxmd.com/read/29180711/global-patterns-in-marine-predatory-fish
#15
P Daniël van Denderen, Martin Lindegren, Brian R MacKenzie, Reg A Watson, Ken H Andersen
Large teleost (bony) fish are a dominant group of predators in the oceans and constitute a major source of food and livelihood for humans. These species differ markedly in morphology and feeding habits across oceanic regions; large pelagic species such as tunas and billfish typically occur in the tropics, whereas demersal species of gadoids and flatfish dominate boreal and temperate regions. Despite their importance for fisheries and the structuring of marine ecosystems, the underlying factors determining the global distribution and productivity of these two groups of teleost predators are poorly known...
November 27, 2017: Nature Ecology & Evolution
https://www.readbyqxmd.com/read/29167503/structural-analyses-of-adenylate-kinases-from-antarctic-and-tropical-fishes-for-understanding-cold-adaptation-of-enzymes
#16
Sojin Moon, Junhyung Kim, Euiyoung Bae
Psychrophiles are extremophilic organisms capable of thriving in cold environments. Proteins from these cold-adapted organisms can remain physiologically functional at low temperatures, but are structurally unstable even at moderate temperatures. Here, we report the crystal structure of adenylate kinase (AK) from the Antarctic fish Notothenia coriiceps, and identify the structural basis of cold adaptation by comparison with homologues from tropical fishes including Danio rerio. The structure of N. coriiceps AK (AKNc) revealed suboptimal hydrophobic packing around three Val residues in its central CORE domain, which are replaced with Ile residues in D...
November 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29161643/effect-of-vacuum-and-modified-atmosphere-packaging-on-the-microbiological-chemical-and-sensory-properties-of-tropical-red-drum-sciaenops-ocellatus-fillets-stored-at-4%C3%A2-c
#17
Adèle Silbande, Sandra Adenet, Christine Chopin, Josiane Cornet, Juliette Smith-Ravin, Katia Rochefort, Françoise Leroi
AIMS: The effect of vacuum (VP - 4°C) and CO2/N2-atmosphere (MAP - 4°C) packaging on the quality of red drum fillets compared with whole gutted iced fish was investigated. METHODS AND RESULTS: A metagenomic approach, bacterial enumeration and isolation, biochemical and sensory analyses were carried out. The organoleptic rejection of whole fish was observed at day 15 whereas VP and MAP fillets appeared unacceptable only after 29days. At these dates, total mesophilic counts reached 10(7)-10(8)CFU g(-1)...
October 26, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29158140/consequences-of-an-uncertain-mass-mortality-regime-triggered-by-climate-variability-on-giant-clam-population-management-in-the-pacific-ocean
#18
Simon Van Wynsberge, Serge Andréfouët, Nabila Gaertner-Mazouni, Georges Remoissenet
Despite actions to manage sustainably tropical Pacific Ocean reef fisheries, managers have faced failures and frustrations because of unpredicted mass mortality events triggered by climate variability. The consequences of these events on the long-term population dynamics of living resources need to be better understood for better management decisions. Here, we use a giant clam (Tridacna maxima) spatially explicit population model to compare the efficiency of several management strategies under various scenarios of natural mortality, including mass mortality due to climatic anomalies...
November 17, 2017: Theoretical Population Biology
https://www.readbyqxmd.com/read/29155453/large-scale-bleaching-of-corals-on-the-great-barrier-reef
#19
T P Hughes, J T Kerry, T Simpson
In 2015-2016, record temperatures triggered a pan-tropical episode of coral bleaching. In the southern hemisphere summer of March-April 2016, we used aerial surveys to measure the level of bleaching on 1,156 individual reefs throughout the 2,300 km length of the Great Barrier Reef, the world's largest coral reef system. The accuracy of the aerial scores was ground-truthed with detailed underwater surveys of bleaching at 260 sites (104 reefs), allowing us to compare aerial and underwater bleaching data with satellite-derived temperatures and with associated model predictions of bleaching...
November 20, 2017: Ecology
https://www.readbyqxmd.com/read/29151854/strong-population-structure-deduced-from-genetics-otolith-chemistry-and-parasite-abundances-explains-vulnerability-to-localized-fishery-collapse-in-a-large-sciaenid-fish-protonibea%C3%A2-diacanthus
#20
Laura Taillebois, Diane P Barton, David A Crook, Thor Saunders, Jonathan Taylor, Mark Hearnden, Richard J Saunders, Stephen J Newman, Michael J Travers, David J Welch, Alan Greig, Christine Dudgeon, Safia Maher, Jennifer R Ovenden
As pressure on coastal marine resources is increasing globally, the need to quantitatively assess vulnerable fish stocks is crucial in order to avoid the ecological consequences of stock depletions. Species of Sciaenidae (croakers, drums) are important components of tropical and temperate fisheries and are especially vulnerable to exploitation. The black-spotted croaker, Protonibea diacanthus, is the only large sciaenid in coastal waters of northern Australia where it is targeted by commercial, recreational and indigenous fishers due to its food value and predictable aggregating behaviour...
December 2017: Evolutionary Applications
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