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https://www.readbyqxmd.com/read/28905373/interactions-between-range-expanding-tropical-fishes-and-the-northern-gulf-of-mexico-red-snapper-lutjanus-campechanus
#1
A R Marshak, K L Heck
Experimental investigation of the intensity of potential competitive interactions among increasingly abundant tropically-associated grey Lutjanus griseus and lane snapper Lutjanus synagris and resident northern Gulf of Mexico (nGOM) red snapper Lutjanus campechanus was undertaken in large outdoor mesocosms. In pair-wise interaction trials, compared with L. synagris, L. campechanus demonstrated significantly increased roving behaviour and predatory activity. While no significant difference in these activities was observed between L...
September 14, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28904784/marine-dock-pilings-foster-diverse-native-cryptobenthic-fish-assemblages-across-bioregions
#2
Simon J Brandl, Jordan M Casey, Nancy Knowlton, James Emmett Duffy
Anthropogenic habitats are increasingly prevalent in coastal marine environments. Previous research on sessile epifauna suggests that artificial habitats act as a refuge for nonindigenous species, which results in highly homogenous communities across locations. However, vertebrate assemblages that live in association with artificial habitats are poorly understood. Here, we quantify the biodiversity of small, cryptic (henceforth "cryptobenthic") fishes from marine dock pilings across six locations over 35° of latitude from Maine to Panama...
September 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28883506/deep-reef-fish-assemblages-of-the-great-barrier-reef-shelf-break-australia
#3
Tiffany L Sih, Mike Cappo, Michael Kingsford
Tropical mesophotic and sub-mesophotic fish ecology is poorly understood despite increasing vulnerability of deeper fish assemblages. Worldwide there is greater fishing pressure on continental shelf-breaks and the effects of disturbances on deeper fish species have not yet been assessed. Difficult to access, deeper reefs host undocumented fish diversity and abundance. Baited Remote Underwater Video Stations (BRUVS) with lights were used to sample deeper habitats (54-260 m), in the Great Barrier Reef (GBR), Australia...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28881940/predation-in-high-co2-waters-prey-fish-from-high-risk-environments-are-less-susceptible-to-ocean-acidification
#4
Maud C O Ferrari, Mark I McCormick, Sue-Ann Watson, Mark G Meekan, Philip L Munday, Douglas P Chivers
Most studies investigating the effects of anthropogenic environmental stressors do so in conditions that are often optimal for their test subjects, ignoring natural stressors such as competition or predation. As such, the quantitative results from such studies may often underestimate the lethality of certain toxic compounds. A well-known example of this concept is illustrated by the marked increase in the lethality of pesticides when larval amphibians are concurrently exposed to the odor of potential predators...
July 1, 2017: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/28875073/the-microbial-biosphere-of-the-coral-acropora-cervicornis-in-northeastern-puerto-rico
#5
Filipa Godoy-Vitorino, Claudia P Ruiz-Diaz, Abigail Rivera-Seda, Juan S Ramírez-Lugo, Carlos Toledo-Hernández
BACKGROUND: Coral reefs are the most biodiverse ecosystems in the marine realm, and they not only contribute a plethora of ecosystem services to other marine organisms, but they also are beneficial to humankind via, for instance, their role as nurseries for commercially important fish species. Corals are considered holobionts (host + symbionts) since they are composed not only of coral polyps, but also algae, other microbial eukaryotes and prokaryotes. In recent years, Caribbean reef corals, including the once-common scleractinian coral Acropora cervicornis, have suffered unprecedented mortality due to climate change-related stressors...
2017: PeerJ
https://www.readbyqxmd.com/read/28873447/flat-and-complex-temperate-reefs-provide-similar-support-for-fish-evidence-for-a-unimodal-species-habitat-relationship
#6
Avery B Paxton, Emily A Pickering, Alyssa M Adler, J Christopher Taylor, Charles H Peterson
Structural complexity, a form of habitat heterogeneity, influences the structure and function of ecological communities, generally supporting increased species density, richness, and diversity. Recent research, however, suggests the most complex habitats may not harbor the highest density of individuals and number of species, especially in areas with elevated human influence. Understanding nuances in relationships between habitat heterogeneity and ecological communities is warranted to guide habitat-focused conservation and management efforts...
2017: PloS One
https://www.readbyqxmd.com/read/28860652/diel-co2-cycles-reduce-severity-of-behavioural-abnormalities-in-coral-reef-fish-under-ocean-acidification
#7
Michael D Jarrold, Craig Humphrey, Mark I McCormick, Philip L Munday
Elevated CO2 levels associated with ocean acidification (OA) have been shown to alter behavioural responses in coral reef fishes. However, all studies to date have used stable pCO2 treatments, not considering the substantial diel pCO2 variation that occurs in shallow reef habitats. Here, we reared juvenile damselfish, Acanthochromis polyacanthus, and clownfish, Amphiprion percula, at stable and diel cycling pCO2 treatments in two experiments. As expected, absolute lateralization of A. polyacanthus and response to predator cue of Am...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28854164/island-biogeography-of-marine-organisms
#8
Hudson T Pinheiro, Giacomo Bernardi, Thiony Simon, Jean-Christophe Joyeux, Raphael M Macieira, João Luiz Gasparini, Claudia Rocha, Luiz A Rocha
Studies on the distribution and evolution of organisms on oceanic islands have advanced towards a dynamic perspective, where terrestrial endemicity results from island geographical aspects and geological history intertwined with sea-level fluctuations. Diversification on these islands may follow neutral models, decreasing over time as niches are filled, or disequilibrium states and progression rules, where richness and endemism rise with the age of the archipelago owing to the splitting of ancestral lineages (cladogenesis)...
August 30, 2017: Nature
https://www.readbyqxmd.com/read/28852508/physiology-can-contribute-to-better-understanding-management-and-conservation-of-coral-reef-fishes
#9
Björn Illing, Jodie L Rummer
Coral reef fishes, like many other marine organisms, are affected by anthropogenic stressors such as fishing and pollution and, owing to climate change, are experiencing increasing water temperatures and ocean acidification. Against the backdrop of these various stressors, a mechanistic understanding of processes governing individual organismal performance is the first step for identifying drivers of coral reef fish population dynamics. In fact, physiological measurements can help to reveal potential cause-and-effect relationships and enable physiologists to advise conservation management by upscaling results from cellular and individual organismal levels to population levels...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28852089/reproductive-benefits-of-no-take-marine-reserves-vary-with-region-for-an-exploited-coral-reef-fish
#10
A B Carter, C R Davies, M J Emslie, B D Mapstone, G R Russ, A J Tobin, A J Williams
No-take marine reserves (NTMRs) are expected to benefit fisheries via the net export of eggs and larvae (recruitment subsidy) from reserves to adjacent fished areas. Quantifying egg production is the first step in evaluating recruitment subsidy potential. We calculated annual egg production per unit area (EPUA) from 2004 to 2013 for the commercially important common coral trout, Plectropomus leopardus, on fished and NTMR reefs throughout the Great Barrier Reef (GBR), Australia. Geographic region, NTMR status, fish size, and population density were all found to affect EPUA...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28835538/genomic-diversification-of-giant-enteric-symbionts-reflects-host-dietary-lifestyles
#11
David Kamanda Ngugi, Sou Miyake, Matt Cahill, Manikandan Vinu, Timothy J Hackmann, Jochen Blom, Matthew D Tietbohl, Michael L Berumen, Ulrich Stingl
Herbivorous surgeonfishes are an ecologically successful group of reef fish that rely on marine algae as their principal food source. Here, we elucidated the significance of giant enteric symbionts colonizing these fishes regarding their roles in the digestive processes of hosts feeding predominantly on polysiphonous red algae and brown Turbinaria algae, which contain different polysaccharide constituents. Using metagenomics, single-cell genomics, and metatranscriptomic analyses, we provide evidence of metabolic diversification of enteric microbiota involved in the degradation of algal biomass in these fishes...
August 23, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28833089/life-stage-and-species-identity-affect-whether-habitat-subsidies-enhance-or-simply-redistribute-consumer-biomass
#12
Danielle A Keller, Rachel K Gittman, Rachel K Bouchillon, F Joel Fodrie
1.Quantifying the response of mobile consumers to changes in habitat availability is essential for determining the degree to which population-level productivity is habitat limited rather than regulated by other, potentially density-independent factors. 2.Over landscape scales, this can be explored by monitoring changes in density and foraging as habitat availability varies. As habitat availability increases, densities may: (1) decrease (unit-area production decreases; weak habitat limitation); (2) remain stable (unit-area production remains stable; habitat limitation); or (3) increase (unit-area production increases; strong habitat limitation)...
August 18, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28831109/exposure-to-agricultural-pesticide-impairs-visual-lateralization-in-a-larval-coral-reef-fish
#13
Marc Besson, Camille Gache, Frédéric Bertucci, Rohan M Brooker, Natacha Roux, Hugo Jacob, Cécile Berthe, Valeria Anna Sovrano, Danielle L Dixson, David Lecchini
Lateralization, i.e. the preferential use of one side of the body, may convey fitness benefits for organisms within rapidly-changing environments, by optimizing separate and parallel processing of different information between the two brain hemispheres. In coral reef-fishes, the movement of larvae from planktonic to reef environments (recruitment) represents a major life-history transition. This transition requires larvae to rapidly identify and respond to sensory cues to select a suitable habitat that facilitates survival and growth...
August 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28830627/environmental-drivers-of-sheltering-behaviour-in-large-reef-fishes
#14
James T Kerry, David R Bellwood
Studies of shelter use can provide key insights into the ecology, and structural needs of mobile organisms. Using videos, we examined the usage of tabular corals by large reef fishes, over a 10week period, compared to multiple environmental drivers: visibility, tide (and depth), irradiance, wind speed (as a proxy for wave energy) and water temperature. We found that two of these predictor variables (visibility and wind speed) had a significant effect and together accounted for almost half of the variation in tabular coral usage by fishes...
August 19, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28828253/extended-exposure-to-elevated-temperature-affects-escape-response-behaviour-in-coral-reef-fishes
#15
Donald T Warren, Jennifer M Donelson, Mark I McCormick
The threat of predation, and the prey's response, are important drivers of community dynamics. Yet environmental temperature can have a significant effect on predation avoidance techniques such as fast-start performance observed in marine fishes. While it is known that temperature increases can influence performance and behaviour in the short-term, little is known about how species respond to extended exposure during development. We produced a startle response in two species of damselfish, the lemon damsel Pomacentrus moluccensis, and the Ambon damselfish Pomacentrus amboinensis, by the repeated use of a drop stimulus...
2017: PeerJ
https://www.readbyqxmd.com/read/28827630/macroalgal-browsing-on-a-heavily-degraded-urbanized-equatorial-reef-system
#16
Andrew G Bauman, Andrew S Hoey, Glenn Dunshea, David A Feary, Jeffrey Low, Peter A Todd
The removal of macroalgal biomass is critical to the health of coral reef ecosystems. Previous studies on relatively intact reefs with diverse and abundant fish communities have quantified rapid removal of macroalgae by herbivorous fishes, yet how these findings relate to degraded reef systems where fish diversity and abundance are markedly lower and algal biomass substantially higher, is unclear. We surveyed roving herbivorous fish communities and quantified their capacity to remove the dominant macroalga Sargassum ilicifolium on seven reefs in Singapore; a heavily degraded urbanized reef system...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28812625/larval-fish-dispersal-in-a-coral-reef-seascape
#17
Glenn R Almany, Serge Planes, Simon R Thorrold, Michael L Berumen, Michael Bode, Pablo Saenz-Agudelo, Mary C Bonin, Ashley J Frisch, Hugo B Harrison, Vanessa Messmer, Gerrit B Nanninga, Mark A Priest, Maya Srinivasan, Tane Sinclair-Taylor, David H Williamson, Geoffrey P Jones
Larval dispersal is a critical yet enigmatic process in the persistence and productivity of marine metapopulations. Empirical data on larval dispersal remain scarce, hindering the use of spatial management tools in efforts to sustain ocean biodiversity and fisheries. Here we document dispersal among subpopulations of clownfish (Amphiprion percula) and butterflyfish (Chaetodon vagabundus) from eight sites across a large seascape (10,000 km(2)) in Papua New Guinea across 2 years. Dispersal of clownfish was consistent between years, with mean observed dispersal distances of 15 km and 10 km in 2009 and 2011, respectively...
May 8, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28806740/community-and-government-managed-marine-protected-areas-increase-fish-size-biomass-and-potential-value
#18
Angelica A D Chirico, Timothy R McClanahan, Johan S Eklöf
Government-managed marine protected areas (MPAs) can restore small fish stocks, but have been heavily criticized for excluding resource users and creating conflicts. A promising but less studied alternative are community-managed MPAs, where resource users are more involved in MPA design, implementation and enforcement. Here we evaluated effects of government- and community-managed MPAs on the density, size and biomass of seagrass- and coral reef-associated fish, using field surveys in Kenyan coastal lagoons...
2017: PloS One
https://www.readbyqxmd.com/read/28790429/cross-scale-habitat-structure-driven-by-coral-species-composition-on-tropical-reefs
#19
Laura E Richardson, Nicholas A J Graham, Andrew S Hoey
The availability of habitat structure across spatial scales can determine ecological organization and resilience. However, anthropogenic disturbances are altering the abundance and composition of habitat-forming organisms. How such shifts in the composition of these organisms alter the physical structure of habitats across ecologically important scales remains unclear. At a time of unprecedented coral loss and homogenization of coral assemblages globally, we investigate the inherent structural complexity of taxonomically distinct reefs, across five ecologically relevant scales of measurement (4-64 cm)...
August 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28781576/chemically-cued-suppression-of-coral-reef-resilience-where-is-the-tipping-point
#20
Rohan M Brooker, Mark E Hay, Danielle L Dixson
Coral reefs worldwide are shifting from high-diversity, coral-dominated communities to low-diversity systems dominated by seaweeds. This shift can impact essential recovery processes such as larval recruitment and ecosystem resilience. Recent evidence suggests that chemical cues from certain corals attract, and from certain seaweeds suppress, recruitment of juvenile fishes, with loss of coral cover and increases in seaweed cover creating negative feedbacks that prevent reef recovery and sustain seaweed dominance...
December 2016: Coral Reefs: Journal of the International Society for Reef Studies
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