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C Domit, M K Broadhurst, H Bornatowski
During 1442 h of visual observations over 7 years throughout the World Heritage listed Paranaguá estuarine complex, Brazil, seven occurrences of interactions were observed at a single location involving breaching Manta birostris displacing schools of teleosts, which were subsequently preyed upon by Sotalia guianensis. Although the interactions were not definitively categorized as being amensal, commensal or mutual, their restriction to isolated space (adjacent to a protected area) and time (summer) supports previous assertions the area is important to regional productivity and the continuation of protected-area status...
August 13, 2017: Journal of Fish Biology
James E Byers, Zachary C Holmes, Jennafer C Malek
Although cascading effects of top predators can help structure communities, their influence may vary across habitats that differentially protect prey. Therefore, to understand how and to what degree habitat complexity can affect trophic interactions in adjacent habitats, we used a combination of a broad regional-scale survey, manipulative field trials, and an outdoor mesocosm experiment to quantify predator-prey interaction strengths across four trophic levels. Within estuaries of the southeastern USA, bonnethead sharks (Sphyrna tiburo) hunt blue crabs on mudflats and adjacent oyster reefs, two habitats with vastly different aboveground structure...
August 12, 2017: Oecologia
Zhuo-Yi Zhu, Hui Wu, Su-Mei Liu, Ying Wu, Da-Ji Huang, Jing Zhang, Guo-Sen Zhang
Large areas of hypoxia have been reported off The Changjiang Estuary and in the East China Sea. Five cruises, covering winter, spring, and summer, were carried out from 2007 to 2013 in this region, and in August 2013 (summer), an extensive hypoxic event (11,150km(2)) was observed, which was characterized by an estimated bulk oxygen depletion of 5.1 million tons. A strong tidal impact was observed associated with the bottom oxygen depletion, with the periodicity of diel variations in dissolved oxygen being 12h (i...
August 9, 2017: Marine Pollution Bulletin
Natanael Dantas Farias, Naila Francis Paulo de Oliveira, Patricia Mirella da Silva
Bivalves are filter feeders that obtain food from seawater that may contain infectious agents, such as the protozoan parasites Perkinsus marinus and P. olseni that are associated with massive mortalities responsible for losses in the aquaculture industry. Despite all physical and chemical barriers, microorganisms cross epithelia and infect host tissues to cause pathologies. Epigenetics mechanisms play important roles in a variety of human processes, from embryonic development to cell differentiation and growth...
August 8, 2017: Journal of Invertebrate Pathology
Yihang K Pan, Rasmus Ern, Phillip R Morrison, Colin J Brauner, Andrew J Esbaugh
Hemoglobin (Hb) multiplicity is common in fish, yet despite its ubiquitous nature, the functional significance is unclear. Here we explore the hypothesis that Hb multiplicity plays a role in hypoxia tolerance using the red drum (Sciaenops ocellatus). Red drum is an economically and ecologically important species native to coastal regions and estuaries of the Gulf of Mexico - habitats that routinely experience pronounced hypoxic events. Using a transcriptomic approach, we demonstrate that red drum red blood cells express 7 and 5 Hbα and Hbβ isoforms, respectively...
August 10, 2017: Scientific Reports
Chengsong Zhang, Kuijie Yu, Fuhua Li, Jianhai Xiang
Ridgetail white prawn (Exopalaemon carinicauda) is widely distributed in Chinese coastal zones, especially in the Yellow Sea and Bohai Sea. It is not only considered as an important economic species in China, but also taken as a potential indicator species for the environmental pollution in the estuaries. At present, the responses of this species to environmental toxicants, including trace metal are not well understood. In this study, the acute toxic effects of zinc (Zn) and mercury (Hg) on the survival, oxygen consumption, ammonia-N excretion, and metal accumulation were investigated in the juveniles of E...
August 7, 2017: Ecotoxicology and Environmental Safety
Pedro M Lourenço, Catarina Serra-Gonçalves, Joana Lia Ferreira, Teresa Catry, José P Granadeiro
Microplastics are widespread in aquatic environments and can be ingested by a wide range of organisms. They can also be transferred along food webs. Estuaries and other tidal wetlands may be particularly prone to this type of pollution due to their particular hydrological characteristics and sewage input, but few studies have compared wetlands with different anthropogenic pressure. Furthermore, there is no information on microplastic transfer to secondary intertidal consumers such as shorebirds. We analysed intertidal sediments, macroinvertebrates and shorebirds, from three important wetlands along the Eastern Atlantic (Tejo estuary, Portugal; Banc d'Arguin, Mauritania and Bijagós archipelago, Guinea-Bissau), in order to evaluate the prevalence and transfer of microplastics along the intertidal food web...
August 7, 2017: Environmental Pollution
Tadashi Nakano, Katsumasa Yamada, Kazumaro Okamura
Hypoxia is associated with mass mortality in estuaries, but a direct causal relationship has not been proven to date. This study aimed to demonstrate this relationship and to evaluate how the duration of hypoxia affects the survival of ark shells (Anadara kagoshimensis) using mathematical modeling. The dissolved oxygen concentration was monitored at two stations in the innermost area of Ariake Bay, Japan, to calculate the duration of hypoxia. This was then included in a mathematical model to simulate the population density with sequential computation...
August 7, 2017: Marine Pollution Bulletin
Karina I Paredes-Páliz, Enrique Mateos-Naranjo, Bouchra Doukkali, Miguel A Caviedes, Susana Redondo-Gómez, Ignacio D Rodríguez-Llorente, Eloísa Pajuelo
Metal contamination of estuaries is a severe environmental problem, for which phytoremediation is gaining momentum. In particular, the associations between halophytes-autochthonous rhizobacteria have proven useful for metal phytostabilization in salt marshes. In this work, three bacterial strains (gram-negative and gram-positive) were used for Spartina densiflora inoculation. All three bacteria, particularly Pantoea strains, promoted plant growth and mitigated metal stress on polluted sediments, as revealed from functionality of the photosynthetic apparatus (PSII) and maintenance of nutrient balance...
August 8, 2017: Marine Pollution Bulletin
M Celeste López Abbate, Juan Carlos Molinero, Valeria A Guinder, Gerardo M E Perillo, R Hugo Freije, Ulrich Sommer, Carla V Spetter, Jorge E Marcovecchio
Estuaries are among the most valuable aquatic systems by their services to human welfare. However, increasing human activities at the watershed along with the pressure of climate change are fostering the co-occurrence of multiple environmental drivers, and warn of potential negative impacts on estuaries resources. At present, no clear understanding of how coastal ecosystems will respond to the non-stationary effect of multiple drivers. Here we analysed the temporal interaction among multiple environmental drivers and their changing priority on shaping phytoplankton response in the Bahía Blanca Estuary, SW Atlantic Ocean...
August 6, 2017: Science of the Total Environment
Louise Champoux, Monique Boily
Since 1991, great blue heron (Ardea herodias) eggs have been collected and analyzed for mercury (Hg), persistent organic contaminants (OCs), brominated and non-brominated flame retardants (FRs) as well as stable isotopes δ(13)C and δ(15)N. In the present study, temporal trends of contaminants were analyzed in eggs sampled in four regions along the St. Lawrence River (Quebec, Canada) and inland sites using new and previously published data. Most contaminants declined significantly over time in most regions...
August 6, 2017: Science of the Total Environment
Kazuya Takahashi, Øjvind Moestrup, Minoru Wada, Atsushi Ishimatsu, Nguyen Van Nguyen, Yasuwo Fukuyo, Mitsunori Iwataki
A new marine woloszynskioid dinoflagellate Dactylodinium pterobelotum gen. et sp. nov. collected from a southern Vietnamese estuary was described on the basis of LM, SEM and TEM, and molecular phylogeny inferred from rDNA sequences. This species had the smallest number of amphiesmal vesicles (5 latitudinal series) in woloszynskioid dinoflagellates assigned to the Suessiaceae and Borghiellaceae. The eyespot was of type B, composed of osmiophilic globules and brick-like material, located in- and outside the chloroplast, respectively...
August 10, 2017: Journal of Phycology
Rita P Vasconcelos, Marisa I Batista, Sofia Henriques
Estuaries are threatened by intense and continuously increasing human activities. Here we estimated the sensitivity of fish assemblages in a set of estuaries distributed worldwide (based on species vulnerability and resilience), and the exposure to cumulative stressors and coverage by protected areas in and around those estuaries (from marine, estuarine and freshwater ecosystems, due to their connectivity). Vulnerability and resilience of estuarine fish assemblages were not evenly distributed globally and were driven by environmental features...
August 9, 2017: Scientific Reports
Jeffrey Go, Ania T Deutscher, Zoe B Spiers, Kirk Dahle, Peter D Kirkland, Cheryl Jenkins
From January to June 2013 and November to January 2014, mass mortalities were reported in Pacific oysters Crassostrea gigas cultivated in Port Stephens estuary, New South Wales, Australia. In some cases, 100% mortality was reported in both triploid and diploid C. gigas, although native species of oyster cultivated in the same areas remained unaffected. Histological examination of oysters sampled from the time of mortality events revealed consistent but non-specific pathology, involving a diffuse haemocytic infiltrate in the connective tissue surrounding the digestive gland, extending into the mantle in some instances, but no other signs of any infectious aetiological agent...
August 9, 2017: Diseases of Aquatic Organisms
Manuela Zeglin Camargo, Leonardo Sandrini-Neto, Renato S Carreira, Maurício G Camargo
Changes in the structure of benthic macrofauna and its relationship with hydrocarbon contamination were determined at different spatial scales in sublittoral sediments of two large estuaries in Brazil. Guanabara Bay (GB) is a heavily polluted estuary due to the presence of a large industrial complex and high demographic density. Laranjeiras Bay (LB) lies in an Environmental Protection Area and can still be considered as preserved from human activities. Despite some spatial differences within each bay, the PAHs concentrations were significantly and consistently higher in GB, with values generally above the threshold effect levels...
August 5, 2017: Marine Pollution Bulletin
Pamela Y Quintas, Andrés H Arias, Ana L Oliva, Claudia E Domini, Mónica B Alvarez, Mariano Garrido, Jorge E Marcovecchio
Levels of tributyltin and its breakdown compounds, including the first record of monobutyltin (MBT) in history for Latin America, were determined in native mussels (Brachidontes rodriguezii) by means of CG-MS, after extraction/derivatization assisted by ultrasound. The samples were collected in 2013 in Bahía Blanca Estuary (Argentina) at 6 sites, which reflect different levels of maritime activities. Total butyltins (TBts = TBT+ DBT+ MBT) levels ranged from 19.64 to 180.57ng Sn g(-1) dry weight. According to the Oslo-Paris commission, the results indicated that 73...
August 4, 2017: Ecotoxicology and Environmental Safety
Lydie Herfort, Byron C Crump, Caroline S Fortunato, Lee Ann McCue, Victoria Campbell, Holly M Simon, António M Baptista, Peter Zuber
Estuarine turbidity maxima (ETM) function as hotspots of microbial activity and diversity in estuaries, yet, little is known about the temporal and spatial variability in ETM bacterial community composition. To determine which environmental factors affect ETM bacterial populations in the Columbia River estuary, we analyzed ETM bacterial community composition (Sanger sequencing and amplicon pyrosequencing of 16S rRNA gene) and bulk heterotrophic production ((3) H-leucine incorporation rates). We collected water 20 times to cover five ETM events and obtained 42 samples characterized by different salinities, turbidities, seasons, coastal regimes (upwelling vs...
August 6, 2017: MicrobiologyOpen
Jia Li, Hua Zhang
Adsorption-desorption behavior of ionic antibiotics in natural aquatic environment is complex, especially in coastal or estuary area where influencing factors such as pH and salinity usually varied in a wide range. In this study, batch-type and stirred flow chamber (SFC) experiments were carried out to simulate the sorption-desorption behavior of trimethoprim (TMP) in seawater-sediment system. Equilibrium and kinetic modeling were carried out to determine the rate and extent of TMP sorption on two marine sediments with different properties...
August 5, 2017: Environmental Science and Pollution Research International
Yaodong He, Biswarup Sen, Junyang Shang, Yike He, Ningdong Xie, Yongfeng Zhang, Jianle Zhang, Zackary I Johnson, Guangyi Wang
In this study, we investigated the environmental impacts of scallop culture on two coastal estuaries adjacent the Bohai Sea including developing a quantitative PCR assay to assess the abundance of the bacterial pathogens Escherichia coli and Vibrio parahaemolyticus. Scallop culture resulted in a significant reduction of nitrogen, Chlorophyll a, and phosphorous levels in seawater during summer. The abundance of bacteria including V. parahaemolyticus varied significantly across estuaries and breeding seasons and was influenced by nitrate as well as nutrient ratios (Si/DIN, N/P)...
August 2, 2017: Marine Pollution Bulletin
Ruth H Thurstan, Edward Game, John M Pandolfi
Despite threats to human wellbeing from ecological degradation, public engagement with this issue remains at low levels. However, studies have shown that crafting messages to resonate with people's personal experiences can enhance engagement. Recreational fishing is one of the principal ways in which people interact with aquatic environments, but long-term data from this perspective are considered rare. We uncovered 852 popular media records of recreational fishing for an Australian estuary across a 140-year period...
2017: PloS One
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