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https://www.readbyqxmd.com/read/27897997/thermal-resilience-of-feeding-kinematics-may-contribute-to-the-spread-of-invasive-fishes-in-light-of-climate-change
#1
Ralph Turingan, Tyler Sloan
As a consequence of global warming, tropical invasive species are expected to expand their range pole-ward, extending their negative impacts to previously undisturbed, high-latitude ecosystems. Investigating the physiological responses of invasive species to environmental temperature is important because the coupled effects of climate change and species invasion on ecosystems could be more alarming than the effects of each phenomenon independently. Especially in poikilotherms, the rate of motion in muscle-driven biomechanical systems is expected to double for every 10 °C increase in temperature...
November 25, 2016: Biology
https://www.readbyqxmd.com/read/27896479/body-size-drives-allochthony-in-food-webs-of-tropical-rivers
#2
Timothy D Jardine, Thomas S Rayner, Neil E Pettit, Dominic Valdez, Douglas P Ward, Garry Lindner, Michael M Douglas, Stuart E Bunn
Food web subsidies from external sources ("allochthony") can support rich biological diversity and high secondary and tertiary production in aquatic systems, even those with low rates of primary production. However, animals vary in their degree of dependence on these subsidies. We examined dietary sources for aquatic animals restricted to refugial habitats (waterholes) during the dry season in Australia's wet-dry tropics, and show that allochthony is strongly size dependent. While small-bodied fishes and invertebrates derived a large proportion of their diet from autochthonous sources within the waterhole (phytoplankton, periphyton, or macrophytes), larger animals, including predatory fishes and crocodiles, demonstrated allochthony from seasonally inundated floodplains, coastal zones or the surrounding savanna...
November 28, 2016: Oecologia
https://www.readbyqxmd.com/read/27894882/comparing-biomarker-responses-during-thermal-acclimation-a-lethal-vs-non-lethal-approach-in-a-tropical-reef-clownfish
#3
Carolina Madeira, Diana Madeira, Mário S Diniz, Henrique N Cabral, Catarina Vinagre
Knowledge of thermal stress biology for most tropical fish species in reef ecosystems under climate change is still quite limited. Thus, the objective of this study was to measure the time-course changes of thermal stress biomarkers in the commercially exploited coral reef fish Amphiprion ocellaris, during a laboratory simulated event of increased temperature. Heat shock protein 70kDa (Hsp70) and total ubiquitin (Ub) were determined in the muscle (lethal method) and in the fin (non-lethal alternative method) under two temperature treatments (control - 26°C and elevated temperature - 30°C) throughout one month with weekly samplings...
November 25, 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27886582/crude-extract-of-cyanobacteria-radiocystis-fernandoi-strain-r28-induces-liver-impairments-in-fish
#4
M G Paulino, D Tavares, F Bieczynski, P G Pedrão, N E S Souza, M M Sakuragui, C M Luquet, A P Terezan, J B Fernandes, A Giani, M N Fernandes
Radiocystis fernandoi R28 strain is a cyanobacterium which produces mostly the RR and YR microcystin variants (MC-RR and MC-YR, respectively). The effects of crude extract of the R. fernandoi strain R28 were evaluated on the protein phosphatases and on the structure and ultrastructure of the liver of the Neotropical fish, Hoplias malabaricus, after acute and subchronic exposure. Concomitantly, the accumulation of the majority of MCs was determined in the liver and muscle. The fish were exposed to 120.60 MC-RR+MC-LR kg-fish(-1) (=100μg MC-LReq kg-fish(-1)) for 12 and 96h (one single dose, acute exposure) and 30days (one similar dose every 72h, subchronic exposure)...
November 17, 2016: Aquatic Toxicology
https://www.readbyqxmd.com/read/27885668/characterization-of-gambierdiscus-lapillus-sp-nov-gonyaulacales-dinophyceae-a-new-toxic-dinoflagellate-from-the-great-barrier-reef-australia
#5
Anna Liza Kretzschmar, Arjun Verma, D Tim Harwood, Mona Hoppenrath, Shauna Murray
Gambierdiscus is a genus of benthic dinoflagellates found worldwide. Some species produce neurotoxins (maitotoxins and ciguatoxins) which bioaccumulate and cause ciguatera fish poisoning, a potentially fatal food-borne illness that is common worldwide in tropical regions. The investigation of toxigenic species of Gambierdiscus in ciguatera fish poisoning endemic regions in Australia is necessary as a first step in order to determine which species of Gambierdiscus are related to ciguatera fish poisoning cases occurring in this region...
November 25, 2016: Journal of Phycology
https://www.readbyqxmd.com/read/27885615/the-white-mullet-mugil-curema-as-biological-indicator-to-assess-environmental-stress-in-tropical-coastal-lagoons
#6
Alejandra García-Gasca, Julián Ríos-Sicairos, Rubí Hernández-Cornejo, Isabel Cunha, Jesús N Gutiérrez, Héctor Plascencia-González, Luz María García de la Parra, Selene Abad-Rosales, Miguel Betancourt-Lozano
Several coastal lagoons and estuaries in Mexico receive untreated domestic and industrial discharges which contain complex mixtures of contaminants. In order to assess the effects of chemical contamination, we used the White mullet (Mugil curema) as biological indicator. We worked in two estuaries located in Northwest Mexico: Urias (highly polluted) and Teacapan (less polluted, therefore used as reference site). We measured several endpoints at different levels of biological organization: vitellogenin transcription in males as biomarker of estrogenic contamination, as well as reproductive, morphological (deformities), morphometric, and meristic parameters...
December 0: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27870030/fish-introductions-and-light-modulate-food-web-fluxes-in-tropical-streams-a-whole-ecosystem-experimental-approach
#7
Sarah M Collins, Steven A Thomas, Thomas Heatherly, Keeley L MacNeill, Antoine O H C Leduc, Andrés López-Sepulcre, Bradley A Lamphere, Rana W El-Sabaawi, David N Reznick, Catherine M Pringle, Alexander S Flecker
Decades of ecological study have demonstrated the importance of top-down and bottom-up controls on food webs, yet few studies within this context have quantified the magnitude of energy and material fluxes at the whole-ecosystem scale. We examined top-down and bottom-up effects on food web fluxes using a field experiment that manipulated the presence of a consumer, the Trinidadian guppy Poecilia reticulata, and the production of basal resources by thinning the riparian forest canopy to increase incident light...
November 2016: Ecology
https://www.readbyqxmd.com/read/27861787/tropical-fish-community-does-not-recover-45-years-after-predator-introduction
#8
D M T Sharpe, L F De León, R Gonzalez, M E Torchin
Predation is considered an important factor structuring natural communities. However, it is often difficult to determine how it may influence long-term, broad-scale diversity patterns, particularly in diverse tropical systems. Biological introductions can provide powerful insight to test the sustained consequences of predation in natural communities, if pre-introduction data are available. Half a century ago, Zaret and Paine (1973) demonstrated strong and immediate community-level effects following the introduction of a novel apex predator (peacock bass, Cichla monoculus) into Lake Gatun, Panama...
November 11, 2016: Ecology
https://www.readbyqxmd.com/read/27854060/comparison-of-predicted-aquatic-risks-of-pesticides-used-under-different-rice-farming-strategies-in-the-mekong-delta-vietnam
#9
Nadja Stadlinger, Håkan Berg, Paul J Van den Brink, Nguyen T Tam, Jonas S Gunnarsson
This study evaluates the risks of pesticides applied in rice-fish and rice farming, with and without integrated pest management (IPM) strategies, to non-target aquatic organisms in two provinces of the Mekong Delta, Vietnam. Pesticide inventories and application patterns were collected from 120 Vietnamese farmers through interviews. Risks were assessed using (1) Pesticide RIsks in the Tropics to Man, Environment, and Trade (PRIMET), a first-tier model, which calculates predicted environmental concentrations (PECs) of pesticides in the rice field, based on the compound's physico-chemical properties and the application pattern, and then compares the PECs to safe concentrations based on literature data, and (2) species sensitivity distribution (SSD), a second-tier assessment model using species sensitivity distributions to calculate potentially affected fraction (PAF) of species based on the PECs from PRIMET...
November 16, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27849585/long-term-empirical-evidence-of-ocean-warming-leading-to-tropicalization-of-fish-communities-increased-herbivory-and-loss-of-kelp
#10
Adriana Vergés, Christopher Doropoulos, Hamish A Malcolm, Mathew Skye, Marina Garcia-Pizá, Ezequiel M Marzinelli, Alexandra H Campbell, Enric Ballesteros, Andrew S Hoey, Ana Vila-Concejo, Yves-Marie Bozec, Peter D Steinberg
Some of the most profound effects of climate change on ecological communities are due to alterations in species interactions rather than direct physiological effects of changing environmental conditions. Empirical evidence of historical changes in species interactions within climate-impacted communities is, however, rare and difficult to obtain. Here, we demonstrate the recent disappearance of key habitat-forming kelp forests from a warming tropical-temperate transition zone in eastern Australia. Using a 10-y video dataset encompassing a 0...
November 14, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27825355/seahorses-in-focus-local-ecological-knowledge-of-seahorse-watching-operators-in-a-tropical-estuary
#11
Maria L F Ternes, Leopoldo C Gerhardinger, Alexandre Schiavetti
BACKGROUND: Seahorses are endangered teleost fishes under increasing human pressures worldwide. In Brazil, marine conservationists and policy-makers are thus often skeptical about the viability of sustainable human-seahorse interactions. This study focuses on local ecological knowledge on seahorses and the implications of their non-lethal touristic use by a coastal community in northeastern Brazil. Community-based seahorse-watching activities have been carried out in Maracaípe village since 1999, but remained uninvestigated until the present study...
November 8, 2016: Journal of Ethnobiology and Ethnomedicine
https://www.readbyqxmd.com/read/27822581/association-of-a-specific-algal-group-with-methylmercury-accumulation-in-periphyton-of-a-tropical-high-altitude-andean-lake
#12
William G Lanza, Darío Achá, David Point, Jeremy Masbou, Lucia Alanoca, David Amouroux, Xavier Lazzaro
Periphyton relevance for methylmercury (MeHg) production and accumulation are now well known in aquatic ecosystems. Sulfate-reducing bacteria and other microbial groups were identified as the main MeHg producers, but the effect of periphyton algae on the accumulation and transfer of MeHg to the food web remains little studied. Here we investigated the role of specific groups of algae on MeHg accumulation in the periphyton of Schoenoplectus californicus ssp. (Totora) and Myriophyllum sp. in Uru Uru, a tropical high-altitude Bolivian lake with substantial fishing and mining activities accruing around it...
November 7, 2016: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/27809393/global-warming-will-disproportionately-affect-larger-adults-in-a-predatory-coral-reef-fish
#13
Vanessa Messmer, Morgan S Pratchett, Andrew S Hoey, Andrew J Tobin, Darren J Coker, Steven J Cooke, Timothy D Clark
Global warming is expected to reduce body sizes of ectothermic animals. Although the underlying mechanisms of size reductions remain poorly understood, effects appear stronger at latitudinal extremes (poles and tropics) and in aquatic rather than terrestrial systems. To shed light on this phenomenon, we examined the size-dependence of critical thermal maxima (CTmax) and aerobic metabolism in a commercially important tropical reef fish, the leopard coral grouper (Plectropomus leopardus) following acclimation to current-day (28...
November 3, 2016: Global Change Biology
https://www.readbyqxmd.com/read/27808175/population-assessment-of-tropical-tuna-based-on-their-associative-behavior-around-floating-objects
#14
M Capello, J L Deneubourg, M Robert, K N Holland, K M Schaefer, L Dagorn
Estimating the abundance of pelagic fish species is a challenging task, due to their vast and remote habitat. Despite the development of satellite, archival and acoustic tagging techniques that allow the tracking of marine animals in their natural environments, these technologies have so far been underutilized in developing abundance estimations. We developed a new method for estimating the abundance of tropical tuna that employs these technologies and exploits the aggregative behavior of tuna around floating objects (FADs)...
November 3, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27806035/ciguatera-fish-poisoning
#15
Patrick Armstrong, Peter Murray, Annette Nesdale, Brad Peckler
Ciguatera fish poisoning (CFP) is the most common cause of seafood-toxin poisoning in the world and is most prevalent in tropical and subtropical areas. It causes gastroenteritis but also myriad neurological and cardiovascular symptoms. We present a cluster of CFP that occurred in Wellington Hospital, New Zealand. It resulted in three patients with life threatening cardiotoxicity and a fourth case with severe gastro-intestinal symptoms. The epidemiology, clinical manifestations, diagnosis, treatment and public health issues are discussed...
October 28, 2016: New Zealand Medical Journal
https://www.readbyqxmd.com/read/27799634/almendravirus-a-proposed-new-genus-of-rhabdoviruses-isolated-from-mosquitoes-in-tropical-regions-of-the-americas
#16
Maria Angelica Contreras, Gillian Eastwood, Hilda Guzman, Vsevolod Popov, Chelsea Savit, Sandra Uribe, Laura D Kramer, Thomas G Wood, Steven G Widen, Durland Fish, Robert B Tesh, Nikos Vasilakis, Peter J Walker
The Rhabdoviridae is a diverse family of negative-sense single-stranded RNA viruses, many of which infect vertebrate hosts and are transmitted by hematophagous arthropods. Others appear to be arthropod specific, circulating only within arthropod populations. Herein, we report the isolation and characterization of three novel viruses from mosquitoes collected from the Americas. Coot Bay virus was isolated from Anopheles quadrimaculatus mosquitoes collected in the Everglades National Park, Florida; Rio Chico virus was isolated from Anopheles triannulatus mosquitoes collected in Panama; and Balsa virus was isolated from two pools of Culex erraticus mosquitoes collected in Colombia...
October 31, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27780252/the-trophic-significance-of-the-indo-pacific-humpback-dolphin-sousa-chinensis-in-western-taiwan
#17
Ching-Wen Pan, Meng-Hsien Chen, Lien-Siang Chou, Hsing-Juh Lin
Indo-Pacific humpback dolphins (Sousa chinensis) have attracted considerable attention due to their critically endangered status and related conservation issues, but their trophic relationships and ecological significance in coastal ecosystems are poorly understood. For instance, this species is noticeably more abundant in the Xin-Huwei River Estuary (Ex) of Western Taiwan than in the nearby Zhuoshui River Estuary (Ez), though it is unclear why the distribution shows such partitioning. To explore this topic, we conducted field surveys seasonally for two years from 2012 to 2013 and constructed Ecopath models of Ex, Ez, and an offshore site (Dm) to compare energy flow within the food webs...
2016: PloS One
https://www.readbyqxmd.com/read/27778083/-first-ciguatera-outbreak-in-germany-in-2012
#18
Miriam Friedemann
In November 2012, 23 cases of ciguatera with typical combinations of gastrointestinal and neurological symptoms occurred in Germany after consumption of imported tropical fish (Lutjanus spp.). A questionnaire was used to gather information on the disease course and fish consumption. All patients suffered from pathognomonic cold allodynia. Aside from two severe courses of illness, all other cases showed symptoms of moderate intensity. During a three-year follow-up, seven patients reported prolonged paresthesia for more than one year...
October 24, 2016: Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz
https://www.readbyqxmd.com/read/27761310/a-comprehensive-investigation-of-mesophotic-coral-ecosystems-in-the-hawaiian-archipelago
#19
Richard L Pyle, Raymond Boland, Holly Bolick, Brian W Bowen, Christina J Bradley, Corinne Kane, Randall K Kosaki, Ross Langston, Ken Longenecker, Anthony Montgomery, Frank A Parrish, Brian N Popp, John Rooney, Celia M Smith, Daniel Wagner, Heather L Spalding
Although the existence of coral-reef habitats at depths to 165 m in tropical regions has been known for decades, the richness, diversity, and ecological importance of mesophotic coral ecosystems (MCEs) has only recently become widely acknowledged. During an interdisciplinary effort spanning more than two decades, we characterized the most expansive MCEs ever recorded, with vast macroalgal communities and areas of 100% coral cover between depths of 50-90 m extending for tens of km(2) in the Hawaiian Archipelago...
2016: PeerJ
https://www.readbyqxmd.com/read/27761307/diversity-of-planktonic-fish-larvae-along-a-latitudinal-gradient-in-the-eastern-atlantic-ocean-estimated-through-dna-barcodes
#20
Alba Ardura, Elvira Morote, Marc Kochzius, Eva Garcia-Vazquez
Mid-trophic pelagic fish are essential components of marine ecosystems because they represent the link between plankton and higher predators. Moreover, they are the basis of the most important fisheries resources; for example, in African waters. In this study, we have sampled pelagic fish larvae in the Eastern Atlantic Ocean along a latitudinal gradient between 37°N and 2°S. We have employed Bongo nets for plankton sampling and sorted visually fish and fish larvae. Using the cytochrome oxidase I gene (COI) as a DNA barcode, we have identified 44 OTUs down to species level that correspond to 14 families, with Myctophidae being the most abundant...
2016: PeerJ
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