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https://www.readbyqxmd.com/read/28734075/high-occurrence-of-jellyfish-predation-by-black-browed-and-campbell-albatross-identified-by-dna-metabarcoding
#1
Julie C McInnes, Rachael Alderman, Mary-Anne Lea, Ben Raymond, Bruce E Deagle, Richard A Phillips, Andrew Stanworth, David R Thompson, Paulo Catry, Henri Weimerskirch, Cristián G Suazo, Michaël Gras, Simon N Jarman
Gelatinous zooplankton are a large component of the animal biomass in all marine environments, but are considered to be uncommon in the diet of most marine top predators. However, the diets of key predator groups like seabirds have conventionally been assessed from stomach content analyses, which cannot detect most gelatinous prey. As marine top predators are used to identify changes in the overall species composition of marine ecosystems, such biases in dietary assessment may impact our detection of important ecosystem regime shifts...
July 22, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28733713/diel-cyclic-hypoxia-alters-plasma-lipid-dynamics-and-impairs-reproduction-in-goldfish-carassius-auratus
#2
Aritra Bera, Paramita Banerjee Sawant, Subrata Dasgupta, N K Chadha, Bhawesh T Sawant, Asim Kumar Pal
Diel cyclic hypoxia occurs with varying frequency and duration in freshwater habitats, yet little is known about its effects on reproduction of freshwater fishes. The present study shows that long-term exposure of goldfish (Carassius auratus) to cyclic hypoxia (0.8 ± 0.2 mg/l dissolved oxygen) for 9 h or more, per day, altered plasma lipid and sex steroid profiles, which in turn directly or indirectly suppressed ovarian growth and viable spermatozoa production. Hypoxia decreased total cholesterol and high density lipoprotein (HDL p < 0...
July 21, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28730805/integrating-discovery-driven-proteomics-and-selected-reaction-monitoring-to-develop-a-non-invasive-assay-for-geoduck-reproductive-maturation
#3
Emma B Timmins-Schiffman, Grace A Crandall, Brent Vadopalas, Michael E Riffle, Brook L Nunn, Steven Roberts
Geoduck clams (Panopea generosa) are an increasingly important fishery and aquaculture product along the eastern Pacific coast from Baja California, Mexico to Alaska. These long-lived clams are highly fecund, though sustainable hatchery production of genetically diverse larvae is hindered by the lack of sexual dimorphism, resulting in asynchronous spawning of broodstock, unequal sex ratios, and low numbers of breeders. Development of assays of gonad physiology could indicate sex and maturation stage, as well as be used to assess the status of natural populations...
July 21, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28729611/cryptic-speciation-in-pan-tropical-sea-urchins-a-case-study-of-an-edge-of-range-population-of-tripneustes-from-the-kermadec-islands
#4
Omri Bronstein, Andreas Kroh, Barbara Tautscher, Libby Liggins, Elisabeth Haring
Tripneustes is one of the most abundant and ecologically significant tropical echinoids. Highly valued for its gonads, wild populations of Tripneustes are commercially exploited and cultivated stocks are a prime target for the fisheries and aquaculture industry. Here we examine Tripneustes from the Kermadec Islands, a remote chain of volcanic islands in the southwest Pacific Ocean that mark the boundary of the genus' range, by combining morphological and genetic analyses, using two mitochondrial (COI and the Control Region), and one nuclear (bindin) marker...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28727800/demographic-disequilibrium-in-living-nautiloids-nautilus-and-allonautilus-canary-in-the-coal-mines
#5
W Bruce Saunders, Emily Greenfest-Allen, Peter D Ward
Averaged demographic data from previously unfished populations of Nautilus and Allonautilus (Cephalopoda) provide a baseline to determine if a population is undisturbed and in "equilibrium" or is in "disequilibrium" as a result of fishery pressure. Data are available for previously undisturbed local nautiloid populations in Papua New Guinea, Australia, Indonesia, Fiji, Palau, American Samoa, New Caledonia and Vanuatu (total n = 2,669 live-caught, tagged and released animals). The data show that unfished populations average ~75% males and ~74% mature animals...
2017: PloS One
https://www.readbyqxmd.com/read/28725435/biogeophysical-and-physiological-processes-drive-movement-patterns-in-a-marine-predator
#6
Lucy A Howey, Bradley M Wetherbee, Emily R Tolentino, Mahmood S Shivji
BACKGROUND: Blue sharks (Prionace glauca) are among the most abundant and widely distributed of oceanic elasmobranchs. Millions are taken annually in pelagic longline fisheries and comprise the highest component of auctioned fin weight in the international shark fin trade. Though studies of blue sharks outnumber those of other large pelagic sharks, the species' complicated and sexually segregated life history still confound current understanding of Atlantic movement patterns. Lack of detailed information regarding movement and vertical behavior continues to limit management efforts that require such data for stock assessment and sustainable catch modeling...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28724703/hormonal-responsiveness-to-stress-is-negatively-associated-with-vulnerability-to-angling-capture-in-fish
#7
Michael J Louison, Shivani Adhikari, Jeffrey A Stein, Cory D Suski
Differences in behavior and physiology amongst individuals often alter relative fitness levels in the environment. However, the ideal behavioral/physiological phenotype in a given environment may be altered by human activity, leading to an evolutionary response in the affected population. One example of this process can be found in fisheries (including recreational freshwater fisheries), where selective capture and harvest of individuals with certain phenotypes can drive evolutionary change. While some life history traits and behavioral tendencies influencing capture likelihood have been studied, the physiological mechanisms driving this vulnerability remain poorly understood...
July 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28714583/mapping-social-ecological-vulnerability-to-inform-local-decision-making
#8
Lauric Thiault, Paul Marshall, Stefan Gelcich, Antoine Collin, Frédérique Chlous, Joachim Claudet
An overarching challenge of natural resource management and biodiversity conservation is that relationships between human and nature are difficult to integrate into tools that can effectively guide decision-making. Social-ecological vulnerability offers a valuable framework for identifying and understanding important social-ecological linkages, and the implications of dependencies and other feedback loops in the system. Unfortunately its implementation at local scales has hitherto been limited, due at least in part to the lack of operational tools for spatial representation of social-ecological vulnerability...
July 17, 2017: Conservation Biology: the Journal of the Society for Conservation Biology
https://www.readbyqxmd.com/read/28713786/development-of-a-method-to-extract-and-amplify-the-complete-mitogenome-of-some-sparidae-species
#9
Celestina Mascolo, Marina Ceruso, Paolo Sordino, Giuseppe Palma, Aniello Anastasio, Tiziana Pepe
Previous studies showed that fish mitochondrial DNA (mtDNA) is set up by a closed circular molecule of 16-17 kilobases (kb), comprising 2 ribosomal RNA genes (rRNA), 22 transfer RNA genes (tRNA), 13 protein-coding genes and 2 non-coding regions. The analysis of single mtDNA genes, such as Cytb, COI, 16S and 12S, or short segment of them, has been widely used against species substitution in both fresh and processed fish products. The analysis of the complete mitochondrial genome of fishery products allows to better study and characterise fish species...
April 13, 2017: Italian Journal of Food Safety
https://www.readbyqxmd.com/read/28710567/threatened-fish-and-fishers-along-the-brazilian-atlantic-forest-coast
#10
Alpina Begossi, Svetlana Salivonchyk, Gustavo Hallwass, Natalia Hanazaki, Priscila F M Lopes, Renato A M Silvano
Small-scale fisheries of the Brazilian Atlantic Forest Coast (BAFC) depend on fish resources for food and income. Thus, if the catch diminishes or if fish species that are a target for fishers are overexploited or impacted, this could affect fishers' livelihoods. The exclusion of threatened fish species from the catch is believed to be a threat to small-scale fisheries, which is likely to be the case along the BAFC. Many fish species are currently listed as threatened or vulnerable, whereas there is not enough biological information available to determine the status of the majority of the other species...
July 14, 2017: Ambio
https://www.readbyqxmd.com/read/28710443/defying-dissolution-discovery-of-deep-sea-scleractinian-coral-reefs-in-the-north-pacific
#11
Amy R Baco, Nicole Morgan, E Brendan Roark, Mauricio Silva, Kathryn E F Shamberger, Kelci Miller
Deep-sea scleractinian coral reefs are protected ecologically and biologically significant areas that support global fisheries. The absence of observations of deep-sea scleractinian reefs in the Central and Northeast Pacific, combined with the shallow aragonite saturation horizon (ASH) and high carbonate dissolution rates there, fueled the hypothesis that reef formation in the North Pacific was improbable. Despite this, we report the discovery of live scleractinian reefs on six seamounts of the Northwestern Hawaiian Islands and Emperor Seamount Chain at depths of 535-732 m and aragonite saturation state (Ωarag) values of 0...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28707705/a-minchinia-mercenariae-like-parasite-infects-cockles-cerastoderma-edule-in-galicia-nw-spain
#12
A Ramilo, E Abollo, A Villalba, M J Carballal
The cockle Cerastoderma edule fishery has traditionally been the most important shellfish species in terms of biomass in Galicia (NW Spain). In the course of a survey of the histopathological conditions affecting this species in the Ria of Arousa, a haplosporidan parasite that had not been observed in Galicia was detected in one of the most productive cockle beds of Galicia. Uni- and binucleate cells and multinucleate plasmodia were observed in the connective tissue mainly in the digestive area, gills and gonad...
July 14, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/28707236/historical-record-of-nutrients-inputs-into-the-xin-an-reservoir-and-its-potential-environmental-implication
#13
Xiaobin Jia, Wenyun Luo, Xueqian Wu, Haobin Wei, Baoli Wang, Waiwai Phyoe, Fushun Wang
The Xin'an Reservoir is an important water supply source and water conservation area for the Qiantang River. However, after the occurrence of the two algae blooms in 1998 and 1999, the safety of water quality has been put into question. In order to study the historical deposition of nutrients, sediment cores were collected in different regions from the Xin'an Reservoir. The stable isotopes δ(13)C and δ(15)N, nutrients, total organic carbon (TOC), and inorganic carbon (IC) in the sediment cores were determined...
July 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28704387/abundance-of-commercially-important-reef-fish-indicates-different-levels-of-over-exploitation-across-shelves-of-the-u-s-virgin-islands
#14
Elizabeth Kadison, Marilyn Brandt, Richard Nemeth, Justin Martens, Jeremiah Blondeau, Tyler Smith
The United States Virgin Islands are comprised of two separate insular platforms separated by the deep water Anegada Passage. Although managed by the same regulations, as one fishery, several physical and spatial differences exist between the two northern shelf islands, St. Thomas and St. John, and isolated St. Croix. Based on two long-term fisheries independent datasets, collected by the U.S. Virgin Islands Territorial Coral Reef Monitoring Program and the National Oceanographic and Atmospheric Administration Center for Coastal Monitoring and Assessment, there were significant differences between the northern USVI and St...
2017: PloS One
https://www.readbyqxmd.com/read/28704139/influencing-safety-in-australian-agriculture-and-fisheries
#15
Kristin E McBain-Rigg, Richard C Franklin, Jemma C King, Tony Lower
BACKGROUND: Improving the health and safety of those working in Australian agriculture and fishery industries is a recognized priority area for preventative activities. With Australian agricultural industries being among the nation's most dangerous workplaces, there is a need for action. While there are currently known solutions, their implementation is limited. Influential agents, that is, people who can influence others, are important for helping to engender action to enact solutions into practice...
July 13, 2017: Journal of Agromedicine
https://www.readbyqxmd.com/read/28695188/biology-of-incidental-catch-sea-star-stellaster-childreni-gray-1840-echinodermata-asteroidea-from-malaysian-borneo-exclusive-economic-zone
#16
Ruhana Hassan, Suet Yee Lee, Wan Zabidii Wan Morni
Sea star (class Asteroidea, phylum Echinodermata) is one of the most successful marine organisms inhabiting a wide range of habitats. As one of the key stone species, sea stars are responsible for maintaining much of the local diversity of species within certain communities. Malaysian Exclusive Economic Zone (EEZ) Resource Survey had been carried out from 16th Aug to 6th Nov 2015 and one of the invertebrate by-catch organisms is sea star Stellaster childreni Gray, 1840. This study documents morphological characters and diet of the sea star, besides providing brief descriptions of the habitats based on particle size analysis and vessel log data sheet...
2017: TheScientificWorldJournal
https://www.readbyqxmd.com/read/28694444/preliminary-estimates-of-the-abundance-and-fidelity-of-dolphins-associating-with-a-demersal-trawl-fishery
#17
Simon J Allen, Kenneth H Pollock, Phil J Bouchet, Halina T Kobryn, Deirdre B McElligott, Krista E Nicholson, Joshua N Smith, Neil R Loneragan
The incidental capture of wildlife in fishing gear presents a global conservation challenge. As a baseline to inform assessments of the impact of bycatch on bottlenose dolphins (Tursiops truncatus) interacting with an Australian trawl fishery, we conducted an aerial survey to estimate dolphin abundance across the fishery. Concurrently, we carried out boat-based dolphin photo-identification to assess short-term fidelity to foraging around trawlers, and used photographic and genetic data to infer longer-term fidelity to the fishery...
July 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28693811/marine-debris-ingestion-by-the-south-american-fur-seal-from-the-southwest-atlantic-ocean
#18
Pablo Denuncio, María Agustina Mandiola, Sofía Belén Pérez Salles, Rodrigo Machado, Paulo H Ott, Larissa Rosa De Oliveira, Diego Rodriguez
In this paper, we examined the ingestion of marine debris (MD) in South American fur seals (SAFS), Arctocephalus australis, found dead in coastal beaches of northern Argentina and southern Brazil. Seven percent of 133 SAFS analyzed presented marine debris in their stomach (n=10), with no differences between sampling countries (Brazil n=7, Argentina n=3) and sexes (female=3; male=6). However, significant differences were observed between ages classes, with MD exclusively present in stomach contents of young specimens...
July 7, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28691710/global-mismatch-between-fishing-dependency-and-larval-supply-from-marine-reserves
#19
Marco Andrello, François Guilhaumon, Camille Albouy, Valeriano Parravicini, Joeri Scholtens, Philippe Verley, Manuel Barange, U Rashid Sumaila, Stéphanie Manel, David Mouillot
Marine reserves are viewed as flagship tools to protect exploited species and to contribute to the effective management of coastal fisheries. Yet, the extent to which marine reserves are globally interconnected and able to effectively seed areas, where fisheries are most critical for food and livelihood security is largely unknown. Using a hydrodynamic model of larval dispersal, we predict that most marine reserves are not interconnected by currents and that their potential benefits to fishing areas are presently limited, since countries with high dependency on coastal fisheries receive very little larval supply from marine reserves...
July 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28691401/interannual-variability-in-reproductive-traits-of-the-patagonian-toothfish-dissostichus-eleginoides-around-the-sub-antarctic-island-of-south-georgia
#20
K E Brigden, C T Marshall, B E Scott, E F Young, P Brickle
Commercial fisheries data, collected as part of an observer programme and covering the period 1997-2014, were utilized in order to define key reproductive traits and spawning dynamics of the Patagonian toothfish Dissostichus eleginoides at South Georgia. Multi-year spawning site fidelity of D. eleginoides was revealed through the identification of previously unknown spawning hotspots. Timing of female spawning was shown to have shifted later, leading to a shorter spawning duration. A decrease in length and mass of female and male spawning fish and a reduced number of large spawning fish was found, evidence of a change in size structure of spawning D...
July 2017: Journal of Fish Biology
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