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https://www.readbyqxmd.com/read/29351566/patterns-in-reef-fish-assemblages-insights-from-the-chagos-archipelago
#1
Melita Samoilys, Ronan Roche, Heather Koldewey, John Turner
Understanding the drivers of variability in the composition of fish assemblages across the Indo-Pacific region is crucial to support coral reef ecosystem resilience. Whilst numerous relationships and feedback mechanisms between the functional roles of coral reef fishes and reef benthic composition have been investigated, certain key groups, such as the herbivores, are widely suggested to maintain reefs in a coral-dominated state. Examining links between fishes and reef benthos is complicated by the interactions between natural processes, disturbance events and anthropogenic impacts, particularly fishing pressure...
2018: PloS One
https://www.readbyqxmd.com/read/29345743/refining-mortality-estimates-in-shark-demographic-analyses-a-bayesian-inverse-matrix-approach
#2
Jonathan J Smart, André E Punt, William T White, Colin A Simpfendorfer
Leslie matrix models are an important analysis tool in conservation biology that are applied to a diversity of taxa. The standard approach estimates the finite rate of population growth (λ) from a set of vital rates. In some instances, an estimate of λ is available, but the vital rates are poorly understood and can be solved for using an inverse matrix approach. However, these approaches are rarely attempted due to pre-requisites of information on the structure of age or stage-classes. This study addressed this issue by using a combination of Monte Carlo simulations and the sample-importance-resampling (SIR) algorithm to solve the inverse matrix problem without data on population structure...
January 18, 2018: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/29342277/finding-nemo-hybrid-assembly-with-oxford-nanopore-and-illumina-reads-greatly-improves-the-clownfish-amphiprion-ocellaris-genome-assembly
#3
Mun Hua Tan, Christopher M Austin, Michael P Hammer, Yin Peng Lee, Laurence J Croft, Han Ming Gan
Background: Some of the most widely recognised coral-reef fishes are clownfish or anemonefishes, members of the family Pomacentridae (subfamily: Amphiprioninae). They are popular aquarium species due to their bright colours, adaptability to captivity and fascinating behavior. Their breeding biology (sequential hermaphrodites) and symbiotic mutualism with sea anemones have attracted much scientific interest. Moreover, there are some curious geographic-based phenotypes which warrant investigation...
January 12, 2018: GigaScience
https://www.readbyqxmd.com/read/29335421/hydroacoustics-as-a-tool-to-examine-the-effects-of-marine-protected-areas-and-habitat-type-on-marine-fish-communities
#4
J P Egerton, A F Johnson, J Turner, L LeVay, I Mascareñas-Osorio, O Aburto-Oropeza
Hydroacoustic technologies are widely used in fisheries research but few studies have used them to examine the effects of Marine Protected Areas (MPAs). We evaluate the efficacy of hydroacoustics to examine the effects of closure to fishing and habitat type on fish populations in the Cabo Pulmo National Park (CPNP), Mexico, and compare these methods to Underwater Visual Censuses (UVC). Fish density, biomass and size were all significantly higher inside the CPNP (299%, 144% and 52% respectively) than outside in non-MPA control areas...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29334689/-stick-with-your-own-kind-or-hang-with-the-locals-implications-of-shoaling-strategy-for-tropical-reef-fish-on-a-range-expansion-frontline
#5
Shannen M Smith, Rebecca J Fox, David J Booth, Jennifer M Donelson
Range shifts of tropical marine species to temperate latitudes are predicted to increase as a consequence of climate change. To date, the research focus on climate-mediated range shifts has been predominately dealt with the physiological capacity of tropical species to cope with the thermal challenges imposed by temperate latitudes. Behavioural traits of individuals in the novel temperate environment have not previously been investigated, however, they are also likely to play a key role in determining the establishment success of individual species at the range-expansion forefront...
January 15, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29328509/high-refuge-availability-on-coral-reefs-increases-the-vulnerability-of-reef-associated-predators-to-overexploitation
#6
Alice Rogers, Julia L Blanchard, Steven P Newman, Charlie S Dryden, Peter J Mumby
Refuge availability and fishing alter predator-prey interactions on coral reefs, but our understanding of how they interact to drive food web dynamics, community structure and vulnerability of different trophic groups is unclear. Here, we apply a size-based ecosystem model of coral reefs, parameterized with empirical measures of structural complexity, to predict fish biomass, productivity and community structure in reef ecosystems under a broad range of refuge availability and fishing regimes. In unfished ecosystems, the expected positive correlation between reef structural complexity and biomass emerges, but a non-linear effect of predation refuges is observed for the productivity of predatory fish...
January 12, 2018: Ecology
https://www.readbyqxmd.com/read/29326840/reproductive-gene-expression-in-a-coral-reef-fish-exposed-to-increasing-temperature-across-generations
#7
Heather D Veilleux, Jennifer M Donelson, Philip L Munday
Reproduction in marine fish is generally tightly linked with water temperature. Consequently, when adults are exposed to projected future ocean temperatures, reproductive output of many species declines precipitously. Recent research has shown that in the common reef fish, Acanthochromis polyacanthus, step-wise exposure to higher temperatures over two generations (parents: +1.5°C, offspring: +3.0°C) can improve reproductive output in the F2 generation compared to F2 fish that have experienced the same high temperatures over two generations (F1 parents: +3...
2018: Conservation Physiology
https://www.readbyqxmd.com/read/29324887/the-tracked-roaming-transect-and-distance-sampling-methods-increase-the-efficiency-of-underwater-visual-censuses
#8
Alejo J Irigoyen, Irene Rojo, Antonio Calò, Gastón Trobbiani, Noela Sánchez-Carnero, José A García-Charton
Underwater visual census (UVC) is the most common approach for estimating diversity, abundance and size of reef fishes in shallow and clear waters. Abundance estimation through UVC is particularly problematic in species occurring at low densities and/or highly aggregated because of their high variability at both spatial and temporal scales. The statistical power of experiments involving UVC techniques may be increased by augmenting the number of replicates or the area surveyed. In this work we present and test the efficiency of an UVC method based on diver towed GPS, the Tracked Roaming Transect (TRT), designed to maximize transect length (and thus the surveyed area) with respect to diving time invested in monitoring, as compared to Conventional Strip Transects (CST)...
2018: PloS One
https://www.readbyqxmd.com/read/29299297/herbivory-facilitates-growth-of-a-key-reef-building-caribbean-coral
#9
Adam Suchley, Lorenzo Alvarez-Filip
The decline of reef-building corals in conjunction with shifts to short-lived opportunistic species has prompted concerns that Caribbean reef framework-building capacity has substantially diminished. Restoring herbivore populations may be a potential driver of coral recovery; however, the impact of herbivores on coral calcification has been little studied. We performed an exclusion experiment to evaluate the impact of herbivory on Orbicella faveolata coral growth over 14 months. The experiment consisted of three treatments: full exclusion cages; half cage procedural controls; and uncaged control plates, each with small O...
December 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29299287/diet-reveals-links-between-morphology-and-foraging-in-a-cryptic-temperate-reef-fish
#10
Natalia S Winkler, Maite Paz-Goicoechea, Robert W Lamb, Alejandro Pérez-Matus
Predators select prey so as to maximize energy and minimize manipulation time. In order to reduce prey detection and handling time, individuals must actively select their foraging space (microhabitat) and populations exhibit morphologies that are best suited for capturing locally available prey. We explored how variation in diet correlates with habitat type, and how these factors influence key morphological structures (mouth gape, eye diameter, fin length, fin area, and pectoral fin ratio) in a common microcarnivorous cryptic reef fish species, the triplefin Helcogrammoides cunninghami...
December 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29288701/refuge-mediated-predator-prey-dynamics-and-biomass-pyramids
#11
Hao Wang, Silogini Thanarajah, Philippe Gaudreau
Refuge can greatly influence predator-prey dynamics by movements between the interior and the exterior of a refuge. The presence of refuge for prey decreases predation risk and can have important impacts on the sustainability of a predator-prey system. The principal purpose of this paper is to formulate and analyze a refuge-mediated predator-prey model when the refuge is available to protect a portion of prey from predation. We study the effect of the refuge size on the biomass ratio and extend our refuge model to incorporate fishing and predator migration separately...
December 27, 2017: Mathematical Biosciences
https://www.readbyqxmd.com/read/29282714/bottom-up-processes-mediated-by-social-systems-drive-demographic-traits-of-coral-reef-fishes
#12
Brett M Taylor, Simon J Brandl, Maia Kapur, William D Robbins, Garrett Johnson, Charlie Huveneers, Phil Renaud, J Howard Choat
Ectotherms exhibit considerable plasticity in their life-history traits. This plasticity can reflect variability in environmental and social factors, but the causes of observed patterns are often obscured with increasing spatial scales. We surveyed dichromatic parrotfishes across the northern Great Barrier Reef to examine variation in body size distributions and concomitant size at sex change (L∆50 ) against hypotheses of directional influence from biotic and abiotic factors known to affect demography. By integrating top-down, horizontal, and bottom-up processes, we demonstrate a strong association between exposure regimes (which are known to influence nutritional ecology and mating systems) and both body size distribution and L∆50 (median length at female-to-male sex change), with an accompanying lack of strong empirical support for other biotic drivers previously hypothesized to affect body size distributions...
December 28, 2017: Ecology
https://www.readbyqxmd.com/read/29276130/-reproductive-behavior-of-the-green-birdmouth-wrasse-gomphosus-caeruleus-on-a-reunion-island-reef-mode-of-reproduction-environmental-factors-and-reproductive-strategy-alternation
#13
Thomas Desvignes, Philippe Bourjon, Bruno Chanet
The green birdmouth wrasse Gomphosus caeruleus is present all year round on the coral reefs of Reunion Island (Indian Ocean). A group of individuals was followed on one of these reefs with the objective of studying the reproduction mode of the species, the influence of environmental factors, and social behaviors on the control of reproduction. Our observations revealed that G. caeruleus is, like many Labridae, a protogynous hermaphrodite species, probably diandric, that the reproduction of G. caeruleus is, like in other reef fish species, influenced by the lunar cycle with a peak of reproductive activity during waxing gibbous phase, and that G...
December 21, 2017: Comptes Rendus Biologies
https://www.readbyqxmd.com/read/29259841/unraveling-the-structure-and-composition-of-varadero-reef-an-improbable-and-imperiled-coral-reef-in-the-colombian-caribbean
#14
Valeria Pizarro, Sara C Rodríguez, Mateo López-Victoria, Fernando A Zapata, Sven Zea, Claudia T Galindo-Martínez, Roberto Iglesias-Prieto, Joseph Pollock, Mónica Medina
Coral reefs are commonly associated with oligotrophic, well-illuminated waters. In 2013, a healthy coral reef was discovered in one of the least expected places within the Colombian Caribbean: at the entrance of Cartagena Bay, a highly-polluted system that receives industrial and sewage waste, as well as high sediment and freshwater loads from an outlet of the Magdalena River (the longest and most populated river basin in Colombia). Here we provide the first characterization of Varadero Reef's geomorphology and biological diversity...
2017: PeerJ
https://www.readbyqxmd.com/read/29247694/the-selective-cleaning-behaviour-of-juvenile-blue-headed-wrasse-thalassoma-bifasciatum-in-the-caribbean
#15
Katie Dunkley, Jo Cable, Sarah E Perkins
Through the removal of parasites, dead skin and mucus from the bodies of visiting reef fish (clients), cleaner fish have a significant ecosystem function in the ecology of coral reefs. Cleaners gain nutrition from these interactions and through offering a 'service' are afforded protection from predators. Given these benefits, it is unclear why more fish do not engage in cleaning, and why part-time cleaning strategies exist. On coral reefs, dedicated species clean throughout their life, whereas some species are facultative, employing opportunistic and/or temporary cleaning strategies...
December 13, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/29247288/characterization-of-genome-wide-microsatellite-markers-in-rabbitfishes-an-important-resource-for-artisanal-fisheries-in-the-indo-west-pacific
#16
Ilkser Erdem Kiper, Paulette Bloomer, Philippe Borsa, Thierry Bernard Hoareau
Rabbitfishes are reef-associated fishes that support local fisheries throughout the Indo-West Pacific region. Sound management of the resource requires the development of molecular tools for appropriate stock delimitation of the different species in the family. Microsatellite markers were developed for the cordonnier, Siganus sutor, and their potential for cross-amplification was investigated in 12 congeneric species. A library of 792 repeat-containing sequences was built. Nineteen sets of newly developed primers, and 14 universal finfish microsatellites were tested in S...
December 15, 2017: Molecular Biology Reports
https://www.readbyqxmd.com/read/29238547/temporal-constraints-on-the-potential-role-of-fry-odors-as-cues-of-past-reproductive-success-for-spawning-lake-trout
#17
Tyler J Buchinger, J Ellen Marsden, Thomas R Binder, Mar Huertas, Ugo Bussy, Ke Li, James E Hanson, Charles C Krueger, Weiming Li, Nicholas S Johnson
Deciding where to reproduce is a major challenge for most animals. Many select habitats based upon cues of successful reproduction by conspecifics, such as the presence of offspring from past reproductive events. For example, some fishes select spawning habitat following odors released by juveniles whose rearing habitat overlaps with spawning habitat. However, juveniles may emigrate before adults begin to search for spawning habitat; hence, the efficacy of juvenile cues could be constrained by degradation or dissipation rates...
December 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29234024/patterns-of-biophonic-periodicity-on-coral-reefs-in-the-great-barrier-reef
#18
Jamie N McWilliam, Robert D McCauley, Christine Erbe, Miles J G Parsons
The coral reefs surrounding Lizard Island in the Great Barrier Reef have a diverse soundscape that contains an array of bioacoustic phenomena, notably choruses produced by fishes. Six fish choruses identified around Lizard Island exhibited distinctive spatial and temporal patterns from 2014 to 2016. Several choruses displayed site fidelity, indicating that particular sites may represent important habitat for fish species, such as fish spawning aggregations sites. The choruses displayed a broad range of periodicities, from diel to annual, which provides new insights into the ecology of vocalising reef fish species and the surrounding ecosystem...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29226033/patterns-in-artisanal-coral-reef-fisheries-revealed-through-local-monitoring-efforts
#19
David G Delaney, Lida T Teneva, Kostantinos A Stamoulis, Jonatha L Giddens, Haruko Koike, Tom Ogawa, Alan M Friedlander, John N Kittinger
Sustainable fisheries management is key to restoring and maintaining ecological function and benefits to people, but it requires accurate information about patterns of resource use, particularly fishing pressure. In most coral reef fisheries and other data-poor contexts, obtaining such information is challenging and remains an impediment to effective management. We developed the most comprehensive regional view of shore-based fishing effort and catch published to date, to show detailed fishing patterns from across the main Hawaiian Islands (MHI)...
2017: PeerJ
https://www.readbyqxmd.com/read/29218536/site-fidelity-facilitates-pair-formation-in-aggregations-of-coral-reef-cardinalfish
#20
Theresa Rueger, Naomi M Gardiner, Geoffrey P Jones
Colonial animals often form stable pair bonds, returning to the same site to breed with the same partner every year. Familiarity with both partner and breeding site has the potential to enhance an individual's reproductive success. However, it is often unknown whether the mating system arises because of site fidelity, mate fidelity or both. Here, observational and experimental studies are used to identify causal links between site fidelity and pair formation in a group-living coral reef cardinalfish, Sphaeramia nematoptera...
December 7, 2017: Oecologia
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