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https://www.readbyqxmd.com/read/29413384/advection-of-karenia-brevis-blooms-from-the-florida-panhandle-towards-mississippi-coastal-waters
#1
Inia M Soto, Mustafa Kemal Cambazoglu, Adam D Boyette, Kristina Broussard, Drew Sheehan, Stephan D Howden, Alan M Shiller, Brian Dzwonkowski, Laura Hode, Patrick J Fitzpatrick, Robert A Arnone, Paul F Mickle, Kimberly Cressman
Harmful Algal Blooms (HABs) of Karenia brevis have been documented along coastal waters of every state bordering the Gulf of Mexico (GoM). Some Gulf Coast locations, such as Florida and Texas, suffer from recurrent intense and spatially large blooms, while others such as Mississippi seem to rarely observe them. The main objective of this work is to understand the dynamics that led to the K. brevis bloom in Mississippi coastal waters in fall 2015. Blooms of K. brevis from the Florida Panhandle region are often advected westward towards the Mississippi-Alabama coast; however there is interannual variability in their presence and intensity in Mississippi coastal waters...
February 2018: Harmful Algae
https://www.readbyqxmd.com/read/29411206/the-toxicity-of-a-mixture-of-two-antiseptics-triclosan-and-triclocarban-on-reproduction-and-growth-of-the-nematode-caenorhabditis-elegans
#2
Anna Katharina Vingskes, Nicole Spann
Many widely used healthcare products contain antiseptics, whose persistence in aquatic environments, soils, and sediments leads to the contamination of ecosystems and adversely affects wildlife. Recently, the impact not only of high but also low doses of contaminants and mixtures of several chemicals has become a focus of concern. In this study, toxicity tests of the antiseptics triclosan (TCS) and triclocarban (TCC) were performed in an aquatic test medium using the nematode Caenorhabditis elegans. Nominal concentrations of TCS and TCC were tested in separate single-substance toxicity tests (96-h-exposure), focussing on growth and reproduction endpoints...
February 6, 2018: Ecotoxicology
https://www.readbyqxmd.com/read/29409969/challenges-pitfalls-and-surprises-development-and-validation-of-a-monoclonal-antibody-for-enzyme-immunoassay-of-the-steroid-1%C3%AE-hydroxycorticosterone-in-elasmobranch-species
#3
Catharine J Wheaton, Natalie D Mylniczenko, John M Rimoldi, Rama S V S Gadepalli, R Hart, Bobbi R O'Hara, Andrew N Evans
Sharks and rays are popular species used in wildlife ecotourism and aquariums to educate the public on the behavior, ecology and conservation challenges of elasmobranchs. To understand long-term physiological health and welfare under varying social and husbandry conditions, we developed and validated an enzyme immunoassay (EIA) to measure stress/ionoregulatory hormones in managed and semi-free range southern rays (Hypanus americanus). Banked serum and interrenal samples from 27 female rays managed at Disney's The Seas with Nemo and Friends® and Castaway Cay were used to evaluate measurement of 1α-hydroxycorticosterone (1αOHB) relative to corticosterone (B)...
January 31, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29392606/effects-of-cadmium-on-photosynthesis-of-schima-superba-young-plant-detected-by-chlorophyll-fluorescence
#4
Jingjing Chu, Fan Zhu, Xiaoyong Chen, Huizi Liang, Renjie Wang, Xuxu Wang, Xinhao Huang
Contamination by heavy metals has become a serious environmental pollution issue today due to its potential threat to plant, wildlife, and human health. Photosynthesis, a process in which light energy is used to produce sugar and other organic compounds, is sensitive to heavy metals. In the present study, the response of photosynthetic process and carbon assimilation of Schima superba was investigated under cadmium (Cd) stress. Three Cd concentrations (0, 300, and 600 mg kg-1) were used designated as control (CK), low Cd (L1), and high Cd treatment (L2) of plants...
February 1, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29340618/mitochondrial-toxicity
#5
Joel N Meyer, Jessica H Hartman, Danielle F Mello
Recent decades have seen a rapid increase in reported toxic effects of drugs and pollutants on mitochondria. Researchers have also documented many genetic differences leading to mitochondrial diseases, currently reported to affect ∼1 person in 4,300, creating a large number of potential gene-environment interactions in mitochondrial toxicity. We briefly review this history, and then highlight cutting-edge areas of mitochondrial research including the role of mitochondrial reactive oxygen species in signaling; increased understanding of fundamental biological processes involved in mitochondrial homeostasis (DNA maintenance and mutagenesis, mitochondrial stress response pathways, fusion and fission, autophagy and biogenesis, and exocytosis); systemic effects resulting from mitochondrial stresses in specific cell types; mitochondrial involvement in immune function; the growing evidence of long-term effects of mitochondrial toxicity; mitochondrial-epigenetic cross-talk; and newer approaches to test chemicals for mitochondrial toxicity...
January 11, 2018: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29297811/fecal-cortisol-levels-in-scimitar-horned-oryx-oryx-dammah-reveals-differences-between-captive-environments
#6
Cassandra D Pauling, Scott E Lankford, Victoria L Jackson
Due to the intensive management of the scimitar-horned oryx, Oryx dammah, involving both captivity and reintroductions, understanding the stress associated with environmental situations this endangered species might experience would be particularly helpful. Fecal cortisol levels were measured across seasons, between captive management programs, and among varying reproductive states in animals held at Fossil Rim Wildlife Center (FRWC) and Kansas City Zoo (KCZ). A total of 72 samples were collected from FRWC and 69 samples were collected from KCZ...
December 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/29290644/interactions-of-predominant-insects-and-diseases-with-climate-change-in-douglas-fir-forests-of-western-oregon-and-washington-u-s-a
#7
Michelle C Agne, Peter A Beedlow, David C Shaw, David R Woodruff, E Henry Lee, Steven P Cline, Randy L Comeleo
Forest disturbance regimes are beginning to show evidence of climate-mediated changes, such as increasing severity of droughts and insect outbreaks. We review the major insects and pathogens affecting the disturbance regime for coastal Douglas-fir forests in western Oregon and Washington State, USA, and ask how future climate changes may influence their role in disturbance ecology. Although the physiological constraints of light, temperature, and moisture largely control tree growth, episodic and chronic disturbances interacting with biological factors have substantial impacts on the structure and functioning of forest ecosystems in this region...
February 1, 2018: Forest Ecology and Management
https://www.readbyqxmd.com/read/29250332/within-sample-variation-in-snowshoe-hare-faecal-glucocorticoid-metabolite-measurements
#8
Diana J R Lafferty, Alexander V Kumar, Sarah Whitcher, Klaus Hackländer, L Scott Mills
Faecal glucocorticoid metabolite (FGM) concentrations are used increasingly as a non-invasive measure to index physiological stress experienced by diverse taxa. However, FGM may not be evenly distributed throughout a faecal mass or faecal pellet group. Moreover, within-sample variation in FGM measurements associated with different sampling and/or processing techniques is rarely reported despite potentially having important implications for inferring stress levels in free-ranging wildlife. Using a captive collection of snowshoe hares (Lepus americanus), we (i) assessed repeatability of FGM measurements (i...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/29238699/ticks-and-tick-borne-pathogens-of-the-caribbean-current-understanding-and-future-directions-for-more-comprehensive-surveillance
#9
REVIEW
Mathilde Gondard, Alejandro Cabezas-Cruz, Roxanne A Charles, Muriel Vayssier-Taussat, Emmanuel Albina, Sara Moutailler
Ticks are obligate hematophagous arthropods of significant importance to human and veterinary medicine. They transmit a vast array of pathogens, including bacteria, viruses, protozoa, and helminths. Most epidemiological data on ticks and tick-borne pathogens (TBPs) in the West Indies are limited to common livestock pathogens such as Ehrlichia ruminantium, Babesia spp. (i.e., B. bovis and B. bigemina), and Anaplasma marginale, and less information is available on companion animal pathogens. Of note, human tick-borne diseases (TBDs) remain almost completely uncharacterized in the West Indies...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29230645/pollution-evaluation-of-total-and-acid-leachable-trace-elements-in-surface-sediments-of-hooghly-river-estuary-and-sundarban-mangrove-wetland-india
#10
Priyanka Mondal, Amanda J Reichelt-Brushett, M P Jonathan, S B Sujitha, Santosh Kumar Sarkar
The present work investigated the spatial distribution and ecological risk assessment of total and mild acid-leachable trace elements in surface sediments (top 0-10 cm; grain size ≤ 63 μm) along the Hooghly (Ganges) River Estuary and Sundarban Mangrove Wetland, India. The trace elements, analyzed by ICPMS, showed wide range of variations with the following descending order (mean values expressed in milligrams per kilogram): Fe (25,050 ± 4918) > Al (16,992 ± 4172) > Mn (517 ± 102) > Zn (53 ± 18) > Cu (33 ± 11) > Cr (29 ± 7) > Ni (27 ± 6) > Pb (14 ± 3) > As (5 ± 1) > Se (0...
December 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29223087/oxidative-stress-in-birds-along-a-nox-and-urbanisation-gradient-an-interspecific-approach
#11
Pablo Salmón, Emilie Stroh, Amparo Herrera-Dueñas, Maria von Post, Caroline Isaksson
Urbanisation is regarded as one of the most threatening global issues for wildlife, however, measuring its impact is not always straight forward. Oxidative stress physiology has been suggested to be a useful biomarker of health and therefore, a potentially important indicator of the impact that urban environmental stressors, especially air pollution, can have on wildlife. For example, nitrogen oxides (NOx), released during incomplete combustion of fossil fuels, are highly potent pro-oxidants, thus predicted to affect either the protective antioxidants and/or cause oxidative damage to bio-molecules...
December 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29199102/effect-of-repeated-adrenocorticotropic-hormone-administration-on-reproductive-function-and-hair-cortisol-concentration-during-the-estrous-cycle-in-goats
#12
Natsumi Endo, Hiroaki Yamane, Larasati Puji Rahayu, Tomomi Tanaka
Measurement of the cortisol concentration in hair has been used as an index of chronic stress in several species including humans, wildlife and domestic animals. However, how accurately the cortisol concentration in hair reflects the changes in circulating cortisol concentrations has not been well documented. The objective of the present study was to examine the effect of repeated adrenocorticotropic hormone (ACTH) administration on the reproductive function during the estrous cycle and hair cortisol concentrations in goats...
November 30, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29194954/comt-val-158-met-moderates-the-link-between-rank-and-aggression-in-a-non-human-primate
#13
D R Gutleb, C Roos, A Noll, J Ostner, O Schülke
The COMT Val158Met polymorphism is one of the most widely studied genetic polymorphisms in humans implicated in aggression and the moderation of stressful life event effects. We screened a wild primate population for polymorphisms at the COMT Val158Met site and phenotyped them for aggression to test whether the human polymorphism exists and is associated with variation in aggressive behavior. Subjects were all adults from 4 study groups (37 males, 40 females) of Assamese macaques (Macaca assamensis) in their natural habitat (Phu Khieo Wildlife Sanctuary, Thailand)...
December 1, 2017: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/29157914/population-sensitivities-of-animals-to-chronic-ionizing-radiation-model-predictions-from-mice-to-elephant
#14
Tatiana G Sazykina
Model predictions of population response to chronic ionizing radiation (endpoint 'morbidity') were made for 11 species of warm-blooded animals, differing in body mass and lifespan - from mice to elephant. Predictions were made also for 3 bird species (duck, pigeon, and house sparrow). Calculations were based on analytical solutions of the mathematical model, simulating a population response to low-LET ionizing radiation in an ecosystem with a limiting resource (Sazykina, Kryshev, 2016). Model parameters for different species were taken from biological and radioecological databases; allometric relationships were employed for estimating some parameter values...
November 17, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29050999/chemical-capture-of-impala-aepyceros-melampus-a-review-of-factors-contributing-to-morbidity-and-mortality
#15
REVIEW
Gareth E Zeiler, Leith C R Meyer
OBJECTIVE: To review the factors that contribute to morbidity and mortality of impala undergoing chemical capture, and discuss how they are potentially mitigated. DATABASES USED: PubMed, Science Direct, Google Scholar and Onderstepoort Veterinary Academic Hospital records. CONCLUSIONS AND CLINICAL RELEVANCE: Impala are an important species of antelope in Africa and are often captured during management procedures, veterinary interventions and research projects...
May 18, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/29045433/integrated-mrna-and-microrna-transcriptome-analyses-reveal-regulation-of-thermal-acclimation-in-gymnocypris-przewalskii-a-case-study-in-tibetan-schizothoracine-fish
#16
Cunfang Zhang, Chao Tong, Fei Tian, Kai Zhao
Environmental acclimation is important episode in wildlife occupation of the high-altitude Tibetan Plateau (TP). Transcriptome-wide studies on thermal acclimation mechanism in fish species are rarely revealed in Tibetan Plateau fish at high altitude. Thus, we used mRNA and miRNA transcriptome sequencing to investigate regulation of thermal acclimation in larval Tibetan naked carp, Gymnocypris przewalskii. We first remodeled the regulation network of mRNA and miRNA in thermal acclimation, and then identified differential expression of miRNAs and target mRNAs enriched in metabolic and digestive pathways...
2017: PloS One
https://www.readbyqxmd.com/read/29038944/environmental-lead-and-wild-birds-a-review
#17
Robert J Williams, Steven D Holladay, Susan M Williams, Robert M Gogal
Lead is a persistent inorganic environmental pollutant that affects humans and animals worldwide. Avian species are especially susceptible to lead exposure through consumption of lead ammunition, lead fishing tackle, and other contaminated food sources such as aquatic species ingesting lead contaminated sediments in mining areas. Even with government regulations on the use of lead ammunition in many countries, including the United States, terrestrial, aquatic, predatory, and scavenger avian species are still at risk of exposure to potentially lethal concentrations of lead...
October 17, 2017: Reviews of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29030867/do-host-associated-gut-microbiota-mediate-the-effect-of-an-herbicide-on-disease-risk-in-frogs
#18
Sarah A Knutie, Caitlin Gabor, Kevin D Kohl, Jason R Rohr
1.Environmental stressors, such as pollutants, can increase disease risk in wildlife. For example, the herbicide atrazine affects host defenses (e.g. resistance and tolerance) of the amphibian chytrid fungus Batrachochytrium dendrobatidis (Bd), but the mechanisms for these associations are not always clear. Given that pollutants can alter the gut microbiota of hosts, which in turn can affect their health and immune systems, one potential mechanism by which pollutants could increase infection risk is by influencing host-associated microbiota...
October 14, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28988304/levels-of-plasma-and-fecal-glucocorticoid-metabolites-following-an-acth-challenge-in-male-and-female-coyotes-canis-latrans
#19
Erika T Stevenson, Eric M Gese, Lorin A Neuman-Lee, Susannah S French
Knowledge of endocrine stress responses can be advantageous for understanding how animals respond to their environment. One tool in wildlife endocrinology is to measure the adrenocortical activity as a parameter of disturbance of animals. Fecal glucocorticoid metabolites (GCMs) provide a noninvasive assessment of adrenocortical activity. Using an adrenocorticotropic hormone (ACTH) challenge administered to 28 captive coyotes (Canis latrans), we measured the levels of plasma cortisol, and fecal cortisol and corticosterone metabolites (i...
October 7, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28986081/blood-concentrations-of-pcbs-and-ddts-in-an-avian-predator-endemic-to-southern-africa-associations-with-habitat-electrical-transformers-and-diet
#20
Marie-Sophie Garcia-Heras, Beatriz Arroyo, Robert E Simmons, Pablo R Camarero, Rafael Mateo, Francois Mougeot
Persistent pollutants such as organochlorine compounds (OCs) have been highlighted as a cause of population decline in avian predators. Understanding patterns of OCs contamination can be crucial for the conservation of affected species, yet little is known on these threats to African raptors. Here we report on OC concentrations in an endangered predator endemic to southern Africa, the Black Harrier Circus maurus. Blood samples were collected in 2012-2014 from wild nestlings (n = 90) and adults (n = 23) in south-western South Africa, where agriculture and urbanization have developed rapidly since the 1950s...
October 4, 2017: Environmental Pollution
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