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https://www.readbyqxmd.com/read/28632943/habitat-coupling-writ-large-pelagic-derived-materials-fuel-benthivorous-macroalgal-reef-fishes-in-an-upwelling-zone
#1
Felipe Docmac, Miguel Araya, Ivan A Hinojosa, Cristina Dorador, Chris Harrod
Coastal marine upwelling famously supports elevated levels of pelagic biological production, but can also subsidise production in inshore habitats via pelagic-benthic coupling. Consumers inhabiting macroalgae-dominated rocky reef habitats are often considered to be members of a food web fuelled by energy derived from benthic primary production; conversely, they may also be subsidised by materials transported from pelagic habitats. Here, we used stable isotopes (δ(13) C, δ(15) N) to examine the relative contribution of pelagic and benthic materials to an ecologically and economically important benthivorous fish assemblage inhabiting subtidal macroalgae-dominated reefs along ~1000 km of the northern Chilean coast where coastal upwelling is active...
June 20, 2017: Ecology
https://www.readbyqxmd.com/read/28622053/importance-of-sandy-bottoms-in-coral-reefs-to-the-oscillation-of-daily-rhythms-in-the-tropical-wrasse-halichoeres-trimaculatus
#2
Hitomi Ito-Takeuchi, Kai Takahashi, Selma Bouchekioua, Chihiro Yamauchi, Yuki Takeuchi, Sung-Pyo Hur, Young-Don Lee, Akihiro Takemura
Most wrasse species swim during the day and bury themselves in the sandy bottoms of shallow reefs at night. This study aimed to evaluate the importance of sandy bottoms to the day-active/night-inactive rhythmicity of the tropical wrasse Halichoeres trimaculatus. Actogram analysis revealed that fish were active during the photophase and inactive during the scotophase in aquariums with both sandy and bare bottoms. When fish were kept in aquariums with bare bottoms, rhythmicity was maintained under constant dark conditions (DD) but became obscured under constant light conditions (LL), suggesting that a day-active/night-inactive rhythmicity is regulated by the circadian system...
June 16, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28616239/reflex-impairment-and-physiology-as-predictors-of-delayed-mortality-in-recreationally-caught-yellowtail-snapper-ocyurus-chrysurus
#3
Francesca C Forrestal, M Danielle McDonald, Georgianna Burress, David J Die
Yellowtail snapper (Ocyurus chrysurus) is an important part of the reef fish assemblage in the western, tropical Atlantic and is caught by both recreational and commercial fisheries in south Florida and the Bahamas. It is estimated that 80% of snapper caught within southeastern Florida waters are discarded due to minimum size restrictions. Neglecting to include information on delayed mortality of undersized fish has the potential for fishery managers to overestimate the abundance of smaller size classes and introduce bias into stock assessments...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28615499/the-importance-of-individual-and-species-level-traits-for-trophic-niches-among-herbivorous-coral-reef-fishes
#4
Jacob E Allgeier, Thomas C Adam, Deron E Burkepile
Resolving how species compete and coexist within ecological communities represents a long-standing challenge in ecology. Research efforts have focused on two predominant mechanisms of species coexistence: complementarity and redundancy. But findings also support an alternative hypothesis that within-species variation may be critical for coexistence. Our study focuses on nine closely related and ecologically similar coral reef fish species to test the importance of individual- versus species-level traits in determining the size of dietary, foraging substrate, and behavioural interaction niches...
June 14, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28615351/body-shape-convergence-driven-by-small-size-optimum-in-marine-angelfishes
#5
Bruno Frédérich, Francesco Santini, Nicolai Konow, Joseph Schnitzler, David Lecchini, Michael E Alfaro
Convergent evolution of small body size occurs across many vertebrate clades and may reflect an evolutionary response to shared selective pressures. However it remains unclear if other aspects of phenotype undergo convergent evolution in miniaturized lineages. Here we present a comparative analysis of body size and shape evolution in marine angelfishes (Pomacanthidae), a reef fish family characterized by repeated transitions to small body size. We ask if lineages that evolve small sizes show convergent evolution in body shape...
June 2017: Biology Letters
https://www.readbyqxmd.com/read/28603671/spatial-variation-in-coral-reef-fish-and-benthic-communities-in-the-central-saudi-arabian-red-sea
#6
Maha T Khalil, Jessica Bouwmeester, Michael L Berumen
Local-scale ecological information is critical as a sound basis for spatial management and conservation and as support for ongoing research in relatively unstudied areas. We conducted visual surveys of fish and benthic communities on nine reefs (3-24 km from shore) in the Thuwal area of the central Saudi Arabian Red Sea. Fish biomass increased with increasing distance from shore, but was generally low compared to reefs experiencing minimal human influence around the world. All reefs had a herbivore-dominated trophic structure and few top predators, such as sharks, jacks, or large groupers...
2017: PeerJ
https://www.readbyqxmd.com/read/28596615/assessing-national-biodiversity-trends-for-rocky-and-coral-reefs-through-the-integration-of-citizen-science-and-scientific-monitoring-programs
#7
Rick D Stuart-Smith, Graham J Edgar, Neville S Barrett, Amanda E Bates, Susan C Baker, Nicholas J Bax, Mikel A Becerro, Just Berkhout, Julia L Blanchard, Daniel J Brock, Graeme F Clark, Antonia T Cooper, Tom R Davis, Paul B Day, J Emmett Duffy, Thomas H Holmes, Steffan A Howe, Alan Jordan, Stuart Kininmonth, Nathan A Knott, Jonathan S Lefcheck, Scott D Ling, Amanda Parr, Elisabeth Strain, Hugh Sweatman, Russell Thomson
Reporting progress against targets for international biodiversity agreements is hindered by a shortage of suitable biodiversity data. We describe a cost-effective system involving Reef Life Survey citizen scientists in the systematic collection of quantitative data covering multiple phyla that can underpin numerous marine biodiversity indicators at high spatial and temporal resolution. We then summarize the findings of a continental- and decadal-scale State of the Environment assessment for rocky and coral reefs based on indicators of ecosystem state relating to fishing, ocean warming, and invasive species and describing the distribution of threatened species...
February 1, 2017: Bioscience
https://www.readbyqxmd.com/read/28594864/consistency-in-the-supply-of-larval-fishes-among-coral-reefs-in-french-polynesia
#8
Marc Besson, Camille Gache, Rohan M Brooker, Rakamaly Madi Moussa, Viliame Pita Waqalevu, Moana LeRohellec, Vincent Jaouen, Kévin Peyrusse, Cécile Berthe, Frédéric Bertucci, Hugo Jacob, Christophe Brié, Bruno Wan, René Galzin, David Lecchini
For marine fishes with a bipartite life cycle, pelagic larval dispersal can shape the distribution, connectivity, composition and resilience of adult populations. Numerous studies of larval dispersal, and associated settlement and recruitment processes, have examined the relationship between population connectivity and oceanographic features. However, relatively little is known about spatial and temporal variation in the abundance of larvae settling among different reefs and the extent to which the species assemblage of larvae settling at one location is reflective of the assemblage in neighbouring areas...
2017: PloS One
https://www.readbyqxmd.com/read/28592671/biological-interactions-both-facilitate-and-resist-climate-related-functional-change-in-temperate-reef-communities
#9
Amanda E Bates, Rick D Stuart-Smith, Neville S Barrett, Graham J Edgar
Shifts in the abundance and location of species are restructuring life on the Earth, presenting the need to build resilience into our natural systems. Here, we tested if protection from fishing promotes community resilience in temperate reef communities undergoing rapid warming in Tasmania. Regardless of protection status, we detected a signature of warming in the brown macroalgae, invertebrates and fishes, through increases in the local richness and abundance of warm-affinity species. Even so, responses in protected communities diverged from exploited communities...
June 14, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28592667/motorboat-noise-impacts-parental-behaviour-and-offspring-survival-in-a-reef-fish
#10
Sophie L Nedelec, Andrew N Radford, Leanne Pearl, Brendan Nedelec, Mark I McCormick, Mark G Meekan, Stephen D Simpson
Anthropogenic noise is a pollutant of international concern, with mounting evidence of disturbance and impacts on animal behaviour and physiology. However, empirical studies measuring survival consequences are rare. We use a field experiment to investigate how repeated motorboat-noise playback affects parental behaviour and offspring survival in the spiny chromis (Acanthochromis polyacanthus), a brooding coral reef fish. Repeated observations were made for 12 days at 38 natural nests with broods of young. Exposure to motorboat-noise playback compared to ambient-sound playback increased defensive acts, and reduced both feeding and offspring interactions by brood-guarding males...
June 14, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28586686/vision-and-lack-of-vision-in-the-ocean
#11
Justin Marshall
As land-locked animals, when we visualise the ocean our mind's eye may see crashing waves or a vast blue expanse stretching to the horizon, a raft of torpedoing penguins, a glimpse of colourful coral reef fish from the shark-free safety of a sandy beach. Underwater, the crystal-clear, and in fact not at all silent, world of Jacques Cousteau, or more recently David Attenborough, is a wonderland that some cannot wait to witness first hand as divers, while others are content to see it on a screen. Spend a bit of time underwater, in the English Channel for example, and a few facts emerge...
June 5, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28586677/cryptobenthic-reef-fishes
#12
Christopher H R Goatley, Simon J Brandl
Christopher Goatley and Simon Bran introduce the 'hidden' small fishes found on coral reefs.
June 5, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28585038/power-analysis-as-a-tool-to-identify-statistically-informative-indicators-for-monitoring-coral-reef-disturbances
#13
Simon Van Wynsberge, Antoine Gilbert, Nicolas Guillemot, Tom Heintz, Laura Tremblay-Boyer
Extensive biological field surveys are costly and time consuming. To optimize sampling and ensure regular monitoring on the long term, identifying informative indicators of anthropogenic disturbances is a priority. In this study, we used 1800 candidate indicators by combining metrics measured from coral, fish, and macro-invertebrate assemblages surveyed from 2006 to 2012 in the vicinity of an ongoing mining project in the Voh-Koné-Pouembout lagoon, New Caledonia. We performed a power analysis to identify a subset of indicators which would best discriminate temporal changes due to a simulated chronic anthropogenic impact...
July 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28584703/patterns-of-bleaching-and-mortality-following-widespread-warming-events-in-2014-and-2015-at-the-hanauma-bay-nature-preserve-hawai-i
#14
Ku'ulei S Rodgers, Keisha D Bahr, Paul L Jokiel, Angela Richards Donà
Drastic increases in global carbon emissions in the past century have led to elevated sea surface temperatures that negatively affect coral reef organisms. Worldwide coral bleaching-related mortality is increasing and data has shown even isolated and protected reefs are vulnerable to the effects of global climate change. In 2014 and 2015, coral reefs in the main Hawaiian Islands (MHI) suffered up to 90% bleaching, with higher than 50% subsequent mortality in some areas. The location and severity of bleaching and mortality was strongly influenced by the spatial and temporal patterns of elevated seawater temperatures...
2017: PeerJ
https://www.readbyqxmd.com/read/28581670/interactive-effects-of-predator-and-prey-harvest-on-ecological-resilience-of-rocky-reefs
#15
Robert P Dunn, Marissa L Baskett, Kevin A Hovel
A major goal of ecosystem-based fisheries management is to prevent fishery-induced shifts in community states. This requires an understanding of ecological resilience: the ability of an ecosystem to return to the same state following a perturbation, which can strongly depend on species interactions across trophic levels. We use a structured model of a temperate rocky reef to explore how multi-trophic level fisheries impact ecological resilience. Increasing fishing mortality of prey (urchins) has a minor effect on equilibrium biomass of kelp, urchins, and spiny lobster predators, but increases resilience by reducing the range of predator harvest rates at which alternative stable states are possible...
June 5, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28579077/phylogenomic-analysis-of-lake-malawi-cichlid-fishes-further-evidence-that-the-three-stage-model-of-diversification-does-not-fit
#16
Christopher Darrin Hulsey, Jimmy Zheng, Brant C Faircloth, Axel Meyer, Michael E Alfaro
Adaptive radiations could often occur in discrete stages. For instance, the species flock of ∼1000 species of Lake Malawi cichlid fishes might have only diverged once between rocky and sandy environments during the initial stage of their diversification. All further diversification within the rock-dwelling (mbuna) or sand-dwelling (utaka) cichlids would have occurred during a subsequent second stage of extensive trophic evolution that was followed by a third stage of sexual trait divergence. We provide an improved phylogenetic framework for Malawi cichlids to test this three-stage hypothesis based on newly reconstructed phylogenetic relationships among 32 taxonomically disparate Malawi cichlids species...
June 1, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28576824/pre-settlement-coral-reef-fish-larvae-respond-to-magnetic-field-changes-during-the-day
#17
Jack O'Connor, Rachel Muheim
Observations of coral-reef fish larvae have revealed remarkably consistent orientation behaviour while swimming offshore, requiring large-scale orientation cues. However, the mechanisms underlying this behaviour are still being investigated. One potential large-scale cue for orientation is the Earth's geomagnetic field. Here, we examined the effect of magnetic field manipulations on the orientation behaviour of coral-reef fish during the pelagic larval phase. In the absence of visual cues, individual larvae responded to a 90° shift of the horizontal component of the magnetic field within a Helmholtz coil with a comparable shift in orientation, demonstrating that they use a magnetic compass for orientation...
June 2, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28575780/tourism-as-a-driver-of-conflicts-and-changes-in-fisheries-value-chains-in-marine-protected-areas
#18
P F M Lopes, L Mendes, V Fonseca, S Villasante
Although critical tools for protecting ocean habitats, Marine Protected Areas (MPAs) are sometimes challenged for social impacts and conflicts they may generate. Some conflicts have an economic base, which, once understood, can be used to resolve associated socioenvironmental problems. We addressed how the fish trade in an MPA that combines no-take zones and tourist or resident zones creates incentives for increased fisheries. We performed a value chain analysis following the fish supply and trade through interviews that assessed consumer demand and preference...
May 30, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28573007/depth-dependent-effects-of-culling-do-mesophotic-lionfish-populations-undermine-current-management
#19
Dominic A Andradi-Brown, Rachel Grey, Alicia Hendrix, Drew Hitchner, Christina L Hunt, Erika Gress, Konrad Madej, Rachel L Parry, Catriona Régnier-McKellar, Owen P Jones, María Arteaga, Andrea P Izaguirre, Alex D Rogers, Dan A Exton
Invasive lionfish (Pterois volitans and P. miles) have spread widely across the western Atlantic and are recognized as a major threat to native marine biodiversity. Although lionfish inhabit both shallow reefs and mesophotic coral ecosystems (MCEs; reefs from 30 to 150 m depth), the primary management response implemented by many countries has been diver-led culling limited to reefs less than 30 m. However, many reef fish undergo ontogenetic migrations, with the largest and therefore most fecund individuals found at greatest depths...
May 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28566681/dimethyl-sulfide-is-a-chemical-attractant-for-reef-fish-larvae
#20
Matthew A Foretich, Claire B Paris, Martin Grosell, John D Stieglitz, Daniel D Benetti
Transport of coral reef fish larvae is driven by advection in ocean currents and larval swimming. However, for swimming to be advantageous, larvae must use external stimuli as guides. One potential stimulus is "odor" emanating from settlement sites (e.g., coral reefs), signaling the upstream location of desirable settlement habitat. However, specific chemicals used by fish larvae have not been identified. Dimethyl sulfide (DMS) is produced in large quantities at coral reefs and may be important in larval orientation...
May 31, 2017: Scientific Reports
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