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https://www.readbyqxmd.com/read/28724688/dopamine-d1-receptor-activation-leads-to-object-recognition-memory-in-a-coral-reef-fish
#1
Trevor J Hamilton, Martin Tresguerres, David I Kline
Object recognition memory is the ability to identify previously seen objects and is an adaptive mechanism that increases survival for many species throughout the animal kingdom. Previously believed to be possessed by only the highest order mammals, it is now becoming clear that fish are also capable of this type of memory formation. Similar to the mammalian hippocampus, the dorsolateral pallium regulates distinct memory processes and is modulated by neurotransmitters such as dopamine. Caribbean bicolour damselfish (Stegastes partitus) live in complex environments dominated by coral reef structures and thus likely possess many types of complex memory abilities including object recognition...
July 2017: Biology Letters
https://www.readbyqxmd.com/read/28720811/some-coral-diseases-track-climate-oscillations-in-the-caribbean
#2
C J Randall, R van Woesik
Disease outbreaks continue to reduce coral populations worldwide. Understanding coral diseases and their relationships with environmental drivers is necessary to forecast disease outbreaks, and to predict future changes in coral populations. Yet, the temporal dynamics of coral diseases are rarely reported. Here we evaluate trends and periodicities in the records of three common coral diseases (white-band disease, yellow-band disease, and dark-spot syndrome) that were surveyed between 1997 and 2014 at 2082 sites throughout the Caribbean...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28694432/seasonal-variation-modulates-coral-sensibility-to-heat-stress-and-explains-annual-changes-in-coral-productivity
#3
Tim Scheufen, Wiebke E Krämer, Roberto Iglesias-Prieto, Susana Enríquez
The potential effects of seasonal acclimatization on coral sensitivity to heat-stress, has received limited attention despite differing bleaching thresholds for summer and winter. In this study, we examined the response of two contrasting phenotypes, termed winter and summer, of four Caribbean reef corals to similar light and heat-stress levels. The four species investigated were categorized into two groups: species with the ability to harbour large number of symbionts, Orbicella annularis and O. faveolata, and species with reduced symbiont density (Montastraea cavernosa and Pseudodiploria strigosa)...
July 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28651864/another-possible-risk-for-the-mediterranean-sea-aspergillus-sydowii-discovered-in-the-port-of-genoa-ligurian-sea-italy
#4
G Greco, M Capello, G Cecchi, L Cutroneo, S Di Piazza, M Zotti
Aspergillus sydowii is a cosmopolitan fungus that has been responsible for the mass destruction of coral in the Caribbean Sea over the last 15years. To our knowledge, this study has found the first case of A. sydowii in the Mediterranean Sea, in marine-bottom sediments, water and calcareous shells of bivalve molluscs sampled during a campaign to characterise the mycobiota in the Port of Genoa (Italy). The area is characterised by adverse environmental conditions (high turbidity, organic pollution and high concentrations of phosphorus and nitrogen compounds)...
June 23, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28651862/severe-impacts-of-brown-tides-caused-by-sargassum-spp-on-near-shore-caribbean-seagrass-communities
#5
Brigitta I van Tussenbroek, Héctor A Hernández Arana, Rosa E Rodríguez-Martínez, Julio Espinoza-Avalos, Hazel M Canizales-Flores, Carlos E González-Godoy, M Guadalupe Barba-Santos, Alejandro Vega-Zepeda, Ligia Collado-Vides
From mid-2014 until the end of 2015, the Mexican Caribbean coast experienced a massive influx of drifting Sargassum spp. that accumulated on the shores, resulting in build-up of decaying beach-cast material and near-shore murky brown waters (Sargassum-brown-tides, Sbt). The effects of Sbt on four near-shore waters included reduction in light, oxygen (hypoxia or anoxia) and pH. The monthly influx of nitrogen, and phosphorus by drifting Sargassum spp. was estimated at 6150 and 61kgkm(-1) respectively, resulting in eutrophication...
June 23, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28630800/taxonomic-richness-and-abundance-of-cryptic-peracarid-crustaceans-in-the-puerto-morelos-reef-national-park-mexico
#6
Luz Veronica Monroy-Velázquez, Rosa Elisa Rodríguez-Martínez, Fernando Alvarez
BACKGROUND AND AIMS: Cryptic peracarids are an important component of the coral reef fauna in terms of diversity and abundance, yet they have been poorly studied. The aim of this study was to evaluate the taxonomic richness and abundance of cryptic peracarids in coral rubble in the Puerto Morelos Reef National Park, Mexico (PMRNP), and their relationship with depth. METHODS: Three reef sites were selected: (1) Bonanza, (2) Bocana, and (3) Jardines. At each site six kilograms of coral rubble were collected over four sampling periods at three depths: 3 m (back-reef), 6-8 m (fore-reef), and 10-12 m (fore-reef)...
2017: PeerJ
https://www.readbyqxmd.com/read/28626617/doc-concentrations-across-a-depth-dependent-light-gradient-on-a-caribbean-coral-reef
#7
Benjamin Mueller, Erik H Meesters, Fleur C van Duyl
Photosynthates released by benthic primary producers (BPP), such as reef algae and scleractinian corals, fuel the dissolved organic carbon (DOC) production on tropical coral reefs. DOC concentrations near BPP have repeatedly been observed to be elevated compared to those in the surrounding water column. As the DOC release of BPP increases with increasing light availability, elevated DOC concentrations near them will, in part, also depend on light availability. Consequently, DOC concentrations are likely to be higher on the shallow, well-lit reef terrace than in deeper sections on the fore reef slope...
2017: PeerJ
https://www.readbyqxmd.com/read/28591685/identification-of-a-consistent-polyene-component-of-purple-pigment-in-diseased-sclerites-of-caribbean-corals-across-region-species-and-insult-agent
#8
Monty L Fetterolf, Chad L Leverette, Christopher Perez, Garriet W Smith
Gorgonians respond to insult (damage and disease) by producing sclerites containing a purple pigment as opposed to the normal white sclerites. Raman microscopy is used to study the purple areas of three species of diseased coral, Gorgonia ventalina, Pseudoplexaura porosa, and Eunicea laciniata obtained from Puerto Rico. These spectra were compared to Gorgonia ventalina samples previously reported that were obtained from San Salvador, Bahamas. Spectra from two samples of G. ventalina that had been infected by different agents, Aspergillus sydowii and a slime mold, were also obtained...
May 29, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28579915/microbiome-variation-in-corals-with-distinct-depth-distribution-ranges-across-a-shallow-mesophotic-gradient-15-85%C3%A2-m
#9
Bettina Glasl, Pim Bongaerts, Nathalie H Elisabeth, Ove Hoegh-Guldberg, Gerhard J Herndl, Pedro R Frade
Mesophotic coral ecosystems (MCEs) are generally poorly studied, and our knowledge of lower MCEs (below 60 m depth) is largely limited to visual surveys. Here, we provide a first detailed assessment of the prokaryotic community associated with scleractinian corals over a depth gradient to the lower mesophotic realm (15-85 m). Specimens of three Caribbean coral species exhibiting differences in their depth distribution ranges (Agaricia grahamae, Madracis pharensis and Stephanocoenia intersepta) were collected with a manned submersible on the island of Curaçao, and their prokaryotic communities assessed using 16S rRNA gene sequencing analysis...
2017: Coral Reefs: Journal of the International Society for Reef Studies
https://www.readbyqxmd.com/read/28560093/invasive-lionfish-had-no-measurable-effect-on-prey-fish-community-structure-across-the-belizean-barrier-reef
#10
Serena Hackerott, Abel Valdivia, Courtney E Cox, Nyssa J Silbiger, John F Bruno
Invasive lionfish are assumed to significantly affect Caribbean reef fish communities. However, evidence of lionfish effects on native reef fishes is based on uncontrolled observational studies or small-scale, unrepresentative experiments, with findings ranging from no effect to large effects on prey density and richness. Moreover, whether lionfish affect populations and communities of native reef fishes at larger, management-relevant scales is unknown. The purpose of this study was to assess the effects of lionfish on coral reef prey fish communities in a natural complex reef system...
2017: PeerJ
https://www.readbyqxmd.com/read/28558306/user-fees-across-ecosystem-boundaries-are-scuba-divers-willing-to-pay-for-terrestrial-biodiversity-conservation
#11
Michaela Roberts, Nick Hanley, Will Cresswell
While ecological links between ecosystems have been long recognised, management rarely crosses ecosystem boundaries. Coral reefs are susceptible to damage through terrestrial run-off, and failing to account for this within management threatens reef protection. In order to quantify the extent to that coral reef users are willing to support management actions to improve ecosystem quality, we conducted a choice experiment with SCUBA divers on the island of Bonaire, Caribbean Netherlands. Specifically, we estimated their willingness to pay to reduce terrestrial overgrazing as a means to improve reef health...
May 27, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28555884/intraspecific-variation-in-growth-rate-is-a-poor-predictor-of-fitness-for-reef-corals
#12
Peter J Edmunds
Genetic variation underlying differences in organism performance is subject to natural selection, and organisms with high values of genetically-determined phenotypic measures of fitness should perform better than those that do not. Using small scleractinian corals (i.e., ≤ 40-mm diameter), this principle was tested with 20 y of census data from St. John, US Virgin Islands. Using growth rate (change in diameter) as a measure of fitness, growth in one year was tested for association with growth and survivorship in the following two years, and this process was repeated over 20 y using a three-year sliding window...
May 27, 2017: Ecology
https://www.readbyqxmd.com/read/28484634/comparative-behavioural-observations-demonstrate-the-cleaner-shrimp-periclimenes-yucatanicus-engages-in-true-symbiotic-cleaning-interactions
#13
Benjamin M Titus, Clayton Vondriska, Marymegan Daly
Cleaner shrimps are ecologically important members of coral reef communities, but for many species, cleaner status (i.e. dedicated, facultative and mimic), clientele and ecological role remain unverified or described. On Caribbean coral reefs, the spotted 'cleaner' shrimp Periclimenes yucatanicus forms symbioses with sea anemones that may serve as cleaning stations for reef fishes. The status of this species as a cleaner is ambiguous: only a single in situ cleaning interaction has been reported, and in the only test of its efficacy as a cleaner, it did not effectively reduce parasite loads from surgeonfish...
April 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28472031/estimating-the-effect-of-multiple-environmental-stressors-on-coral-bleaching-and-mortality
#14
Paul D Welle, Mitchell J Small, Scott C Doney, Inês L Azevedo
Coral cover has been declining in recent decades due to increased temperatures and environmental stressors. However, the extent to which different stressors contribute both individually and in concert to bleaching and mortality is still very uncertain. We develop and use a novel regression approach, using non-linear parametric models that control for unobserved time invariant effects to estimate the effects on coral bleaching and mortality due to temperature, solar radiation, depth, hurricanes and anthropogenic stressors using historical data from a large bleaching event in 2005 across the Caribbean...
2017: PloS One
https://www.readbyqxmd.com/read/28458657/comparative-metagenomics-of-the-polymicrobial-black-band-disease-of-corals
#15
Julie L Meyer, Valerie J Paul, Laurie J Raymundo, Max Teplitski
Black Band Disease (BBD), the destructive microbial consortium dominated by the cyanobacterium Roseofilum reptotaenium, affects corals worldwide. While the taxonomic composition of BBD consortia has been well-characterized, substantially less is known about its functional repertoire. We sequenced the metagenomes of Caribbean and Pacific black band mats and cultured Roseofilum and obtained five metagenome-assembled genomes (MAGs) of Roseofilum, nine of Proteobacteria, and 12 of Bacteroidetes. Genomic content analysis suggests that Roseofilum is a source of organic carbon and nitrogen, as well as natural products that may influence interactions between microbes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28419173/sponge-symbioses-between-xestospongia-deweerdtae-and-plakortis-spp-are-not-motivated-by-shared-chemical-defense-against-predators
#16
Micah Jaarsma Marty, Jan Vicente, Benjamin L Oyler, Allen Place, Russell T Hill
The recently described epizoic sponge-sponge symbioses between Xestospongia deweerdtae and two species of Plakortis present an unusual series of sponge interactions. Sponges from the genus Plakortis are fierce allelopathic competitors, rich in cytotoxic secondary metabolites, and yet X. deweerdtae flourishes as an epizoic encrustation on Plakortis deweerdtaephila and Plakortis symbiotica. Our objective in this study was to evaluate the hypothesis that X. deweerdtae grows epizoic to these two species of Plakortis due to a shared chemical defense against predators...
2017: PloS One
https://www.readbyqxmd.com/read/28378059/facilitation-in-caribbean-coral-reefs-high-densities-of-staghorn-coral-foster-greater-coral-condition-and-reef-fish-composition
#17
Brittany E Huntington, Margaret W Miller, Rachel Pausch, Lee Richter
Recovery of the threatened staghorn coral (Acropora cervicornis) is posited to play a key role in Caribbean reef resilience. At four Caribbean locations (including one restored and three extant populations), we quantified characteristics of contemporary staghorn coral across increasing conspecific densities, and investigated a hypothesis of facilitation between staghorn coral and reef fishes. High staghorn densities in the Dry Tortugas exhibited significantly less partial mortality, higher branch growth, and supported greater fish abundances compared to lower densities within the same population...
May 2017: Oecologia
https://www.readbyqxmd.com/read/28337605/application-of-diet-theory-reveals-context-dependent-foraging-preferences-in-an-herbivorous-coral-reef-fish
#18
John Hanmer, J Wilson White, Joseph R Pawlik
Dietary preferences of grazers can drive spatial variability in top-down control of autotroph communities, because diet composition may depend on the relative availability of autotroph species. On Caribbean coral reefs, parrotfish grazing is important in limiting macroalgae, but parrotfish dietary preferences are poorly understood. We applied diet-switching analysis to quantify the foraging preferences of the redband parrotfish (Sparisoma aurofrenatum). At 12 Caribbean reefs, we observed 293 redband parrotfish in 5-min feeding bouts and quantified relative benthic algal cover using quadrats...
May 2017: Oecologia
https://www.readbyqxmd.com/read/28329020/how-a-collaborative-integrated-taxonomic-effort-has-trained-new-spongiologists-and-improved-knowledge-of-martinique-island-french-antilles-eastern-caribbean-sea-marine-biodiversity
#19
Thierry Pérez, Maria-Cristina Díaz, César Ruiz, Baslavi Cóndor-Luján, Michelle Klautau, Eduardo Hajdu, Gisele Lobo-Hajdu, Sven Zea, Shirley A Pomponi, Robert W Thacker, Sophie Carteron, Guillaume Tollu, Adeline Pouget-Cuvelier, Philippe Thélamon, Jean-Philippe Marechal, Olivier P Thomas, Alexander V Ereskovsky, Jean Vacelet, Nicole Boury-Esnault
Although sponges are important components of benthic ecosystems of the Caribbean Sea, their diversity remained poorly investigated in the Lesser Antilles. By organizing a training course in Martinique, we wanted both to promote taxonomy and to provide a first inventory of the sponge diversity on this island. The course was like a naturalist expedition, with a field laboratory and a classroom nearby. Early-career scientists and environmental managers were trained in sponge taxonomy. We gathered unpublished data and conducted an inventory at 13 coastal sites...
2017: PloS One
https://www.readbyqxmd.com/read/28320966/tropical-dead-zones-and-mass-mortalities-on-coral-reefs
#20
Andrew H Altieri, Seamus B Harrison, Janina Seemann, Rachel Collin, Robert J Diaz, Nancy Knowlton
Degradation of coastal water quality in the form of low dissolved oxygen levels (hypoxia) can harm biodiversity, ecosystem function, and human wellbeing. Extreme hypoxic conditions along the coast, leading to what are often referred to as "dead zones," are known primarily from temperate regions. However, little is known about the potential threat of hypoxia in the tropics, even though the known risk factors, including eutrophication and elevated temperatures, are common. Here we document an unprecedented hypoxic event on the Caribbean coast of Panama and assess the risk of dead zones to coral reefs worldwide...
April 4, 2017: Proceedings of the National Academy of Sciences of the United States of America
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