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Redouan Bshary - One of the best experts on this subject based on the ideXlab platform.
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Cleaner wrasse indirectly affect the cognitive performance of a Damselfish through ectoparasite removal
Proceedings of the Royal Society B: Biological Sciences, 2018Co-Authors: Sandra A Binning, Simona Colosio, Derek Sun, Joanna Miest, Dominique G Roche, Alexandra S. Grutter, Redouan BsharyAbstract:Cleaning organisms play a fundamental ecological role by removing ectoparasites and infected tissue from client surfaces. We used the well-studied cleaning mutualisms involving the cleaner wrasse, Labroides dimidiatus, to test how client cognition is affected by ectoparasites and whether these effects are mitigated by cleaners. Ambon Damselfish ( Pomacentrus amboinensis) collected from experimental reef patches without cleaner wrasse performed worse in a visual discrimination test than conspecifics from patches with cleaners. Endoparasite abundance also negatively influenced success in this test. Visual discrimination performance was also impaired in Damselfish experimentally infected with gnathiid (Crustacea: Isopoda) ectoparasites. Neither cleaner absence nor gnathiid infection affected performance in spatial recognition or reversal learning tests. Injection with immune-stimulating lipopolysaccharide did not affect visual discrimination performance relative to saline-injected controls, suggesting that cognitive impairments are not due to an innate immune response. Our results highlight the complex, indirect role of cleaning organisms in promoting the health of their clients via ectoparasite removal and emphasize the negative impact of parasites on host's cognitive abilities.
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Cleaner wrasses indirectly affect the cognitive performance of a Damselfish through ectoparasite removal
2018Co-Authors: Sandra A Binning, Simona Colosio, Derek Sun, Joanna Miest, Alexandra S. Grutter, Dominique Roche, Redouan BsharyAbstract:Data and script for "Binning SA, Roche DG, Grutter A, Colosio S, Sun D, Miest J, Bshary R (2018) Cleaner wrasse indirectly affect the cognitive performance of a Damselfish through ectoparasite removal. Proc. R. Soc. B. 20172447. http://dx.doi.org/10.1098/rspb.2017.2447"Please see readMe.tx
Martin Grosell - One of the best experts on this subject based on the ideXlab platform.
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damsels in distress oil exposure modifies behavior and olfaction in bicolor Damselfish stegastes partitus
Environmental Science & Technology, 2019Co-Authors: Lela S Schlenker, Megan J Welch, Tricia L Meredith, Ebrahim Lari, Greg G. Pyle, Edward M Mager, Elizabeth A Babcock, Philip L Munday, Martin GrosellAbstract:In fishes, olfactory cues evoke behavioral responses that are crucial to survival; however, the receptors, olfactory sensory neurons, are directly exposed to the environment and are susceptible to damage from aquatic contaminants. In 2010, 4.9 million barrels of crude oil were released into the northern Gulf of Mexico from the Deepwater Horizon disaster, exposing marine organisms to this environmental contaminant. We examined the ability of bicolor Damselfish (Stegastes partitus), exposed to the water accommodated fraction (WAF) of crude oil, to respond to chemical alarm cue (CAC) using a two-channel flume. Control bicolor Damselfish avoided CAC in the flume choice test, whereas WAF-exposed conspecifics did not. This lack of avoidance persisted following 8 days of control water conditions. We then examined the physiological response to CAC, brine shrimp rinse, bile salt, and amino acid cues using the electro-olfactogram (EOG) technique and found that WAF-exposed bicolor Damselfish were less likely to dete...
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Altered brain ion gradients following compensation for elevated CO2 are linked to behavioural alterations in a coral reef fish.
Scientific reports, 2016Co-Authors: Rachael M. Heuer, Megan J Welch, Philip L Munday, Jodie L. Rummer, Martin GrosellAbstract:Neurosensory and behavioural disruptions are some of the most consistently reported responses upon exposure to ocean acidification-relevant CO2 levels, especially in coral reef fishes. The underlying cause of these disruptions is thought to be altered current across the GABAA receptor in neuronal cells due to changes in ion gradients (HCO3− and/or Cl−) that occur in the body following compensation for elevated ambient CO2. Despite these widely-documented behavioural disruptions, the present study is the first to pair a behavioural assay with measurements of relevant intracellular and extracellular acid-base parameters in a coral reef fish exposed to elevated CO2. Spiny Damselfish (Acanthochromis polyacanthus) exposed to 1900 μatm CO2 for 4 days exhibited significantly increased intracellular and extracellular HCO3− concentrations and elevated brain pHi compared to control fish, providing evidence of CO2 compensation. As expected, high CO2 exposed Damselfish spent significantly more time in a chemical alarm cue (CAC) than control fish, supporting a potential link between behavioural disruption and CO2 compensation. Using HCO3− measurements from the Damselfish, the reversal potential for GABAA (EGABA) was calculated, illustrating that biophysical properties of the brain during CO2 compensation could change GABAA receptor function and account for the behavioural disturbances noted during exposure to elevated CO2.
Michael C. Schmale - One of the best experts on this subject based on the ideXlab platform.
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patterns of transcription of a virus like agent in tumor and non tumor tissues in bicolor Damselfish
Comparative Biochemistry and Physiology C-toxicology & Pharmacology, 2004Co-Authors: Jennifer J Rahn, Patrick D L Gibbs, Michael C. SchmaleAbstract:Abstract Damselfish neurofibromatosis (DNF) is a transmissible disease characterized by peripheral nerve sheath and pigment cell tumors which occurs in bicolor Damselfish (Stegastes partitus) on Florida reefs. The Damselfish virus-like agent (DVLA) is associated with the development of DNF and contains a 2.4 kb DNA genome which was found at high levels in tumors and tumor-derived cell lines and at lower levels in non-tumor tissues of both spontaneously diseased fish (TF) and fish with experimentally induced tumors (EF). An analysis of transcription patterns revealed up to five DVLA derived RNAs ranging in size from 300 to 1400 bp in these cell types. DNA was the most commonly distributed DVLA component in TF and EF followed by RNA. Prevalence of transcripts varied by tissue type. The smallest transcripts were the most common in all cell types and the most complete patterns, which included the larger transcripts, were observed primarily in tumors. The presence of viral RNAs in addition to DNA in non-tumor tissues suggested these tissues were infected by DVLA and indicated a wide tissue tropism for this agent. The high levels of DVLA nucleic acids found in tumors suggest that replication is occurring there. However, the potential for DVLA replication in other tissues where only a limited range of transcripts were present is not known. The mechanism of tumorigenesis by this agent is unknown. However, the association of the larger transcripts with most tumor tissues and their absence in most non-tumor tissues suggests that these RNAs may be involved in tumor formation.
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patterns of transcription of a virus like agent in tumor and non tumor tissues in bicolor Damselfish
Comparative Biochemistry and Physiology C-toxicology & Pharmacology, 2004Co-Authors: Jennifer J Rahn, Patrick D L Gibbs, Michael C. SchmaleAbstract:Abstract Damselfish neurofibromatosis (DNF) is a transmissible disease characterized by peripheral nerve sheath and pigment cell tumors which occurs in bicolor Damselfish (Stegastes partitus) on Florida reefs. The Damselfish virus-like agent (DVLA) is associated with the development of DNF and contains a 2.4 kb DNA genome which was found at high levels in tumors and tumor-derived cell lines and at lower levels in non-tumor tissues of both spontaneously diseased fish (TF) and fish with experimentally induced tumors (EF). An analysis of transcription patterns revealed up to five DVLA derived RNAs ranging in size from 300 to 1400 bp in these cell types. DNA was the most commonly distributed DVLA component in TF and EF followed by RNA. Prevalence of transcripts varied by tissue type. The smallest transcripts were the most common in all cell types and the most complete patterns, which included the larger transcripts, were observed primarily in tumors. The presence of viral RNAs in addition to DNA in non-tumor tissues suggested these tissues were infected by DVLA and indicated a wide tissue tropism for this agent. The high levels of DVLA nucleic acids found in tumors suggest that replication is occurring there. However, the potential for DVLA replication in other tissues where only a limited range of transcripts were present is not known. The mechanism of tumorigenesis by this agent is unknown. However, the association of the larger transcripts with most tumor tissues and their absence in most non-tumor tissues suggests that these RNAs may be involved in tumor formation.
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a virus like agent associated with neurofibromatosis in Damselfish
Diseases of Aquatic Organisms, 2002Co-Authors: Michael C. Schmale, Patrick D L Gibbs, C.e. CampbellAbstract:: Damselfish neurofibromatosis (DNF) is a transmissible disease involving neurofibromas and chromatophoromas affecting bicolor Damselfish Stegastes partitus on Florida reefs. Analysis of genomic DNA by Southern blotting techniques demonstrated the presence of a group of extrachromosomal DNAs in tumors from fish affected with DNF but not in healthy individuals. Cell lines obtained from tumors contained identical DNAs and were shown to be tumorigenic in vivo, while lines established from healthy fish did not contain such DNA and were not tumorigenic. These DNA patterns were also observed in experimentally induced tumors. A DNase resistant component of this DNA was isolated from both tumor cells and conditioned media of tumor cell lines suggesting that these sequences were encapsulated in viral particles. These data support the hypothesis that one or more of these extrachromosomal DNA forms is the genome of an unusual virus and that this virus is the etiologic agent of DNF. We have tentatively termed this agent the Damselfish virus-like agent (DVLA).
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a retrovirus isolated from cell lines derived from neurofibromas in bicolor Damselfish pomacentrus partitus
Journal of General Virology, 1996Co-Authors: Michael C. Schmale, Michelle R Aman, Kenneth A GillAbstract:Damselfish neurofibromatosis (DNF) is a naturally occurring, neoplastic disease affecting bicolor Damselfish (Pomacentrus partitus) living on coral reefs in southern Florida, USA. The disease consists of multiple neurofibromas, neurofibrosarcomas and chromatophoromas and has been proposed as an animal model for neurofibromatosis type 1 in humans. DNF is transmissible by injection of crude tumour homogenates, cell-free filtrates of homogenates or cells from tumour cell lines. An analysis of tumorigenic cell lines derived from fish with spontaneous or experimentally induced DNF revealed virus particles budding from cells and present in conditioned media. The 90–110 nm particles resembled type C retroviruses. This virus exhibited a buoyant density of 1.14–1.17 g/cm2 in sucrose, at least six virus proteins of 15 to 80 kDa and reverse transcriptase (RT) activity. RT activity was maximized with a poly(rC)·oligo(dG) template·primer combination and Mn2+ at a concentration of 0.5–1.0 mm. The optimum temperature for RT was determined to be 20 °C, a finding consistent with the ambient temperatures encountered by this species. This retrovirus, tentatively named Damselfish neurofibromatosis virus (DNFV) may be the aetiological agent of DNF. Whether DNFV or another, as yet unidentified, virus is the cause of DNF, this agent may be unique in virus oncogenesis; neoplastic transformation of the cell types involved in DNF, Schwann cells and chromatophores, has not been documented in any other transmissible tumour.
Geoffrey P Jones - One of the best experts on this subject based on the ideXlab platform.
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different responses of coral and rubble dwelling coral reef Damselfishes family pomacentridae to chemosensory cues from coral reef microhabitats
Marine Biology, 2020Co-Authors: Amy G Coppock, Saul Gonzalezmurcia, Maya Srinivasan, Naomi M Gardiner, Geoffrey P JonesAbstract:Coral reef fishes are known to respond to chemical cues in the selection of appropriate microhabitats at settlement. Coral- and non-coral-associated species are likely to respond to different stimuli and the cues may change as larvae settle and become familiar with the reef environment. Here, the chemosensory responses of both late-stage larvae and newly settled juvenile Damselfishes to microhabitat odours were tested in Kimbe Bay (PNG), including four obligate coral-dwelling species (Dascyllus melanurus, D. reticulatus, Chrysiptera arnazae and Pomacentrus moluccensis) and four rubble-dwelling species (Pomacentrus adelus, P. simsiang, Chrysiptera cyanea and C. rollandi). Damselfishes were subjected to a series of pair-wise chemosensory choice trials using a two-channel choice flume. The responses by late-stage larvae (pre-settled) to chemical cues from their preferred microhabitat type mirrored those exhibited by recently settled juveniles. All four rubble-dwelling Damselfish species exhibited a significant aversion toward chemical cues derived from coral microhabitats, preferring to remain either in the water seeded with chemical cues derived from rubble, or the unseeded (control) water. The obligate coral-dwelling Damselfish species tended to avoid rubble and select coral cues when tested against seawater, but unexpectedly, exhibited a neutral response when given a choice between coral and rubble odours. These results indicate that coral and rubble-dwelling Damselfish differ in the strength of their attraction to preferred or avoidance of non-preferred microhabitats. Both factors are likely to play a role in settlement choices. Our results indicated that for some species, newly settled juveniles could act as suitable substitutes for testing larval behavioural traits.
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habitat complexity modifies the impact of piscivores on a coral reef fish population
Oecologia, 1998Co-Authors: Joanne S Beukers, Geoffrey P JonesAbstract:Patterns in juvenile mortality rates can have a profound affect on the distribution and abundance of adult individuals, and may be the result of a number of interacting factors. Field observations at Lizard Island (Great Barrier Reef, Australia) showed that for a coral reef Damselfish, Pomacentrus moluccensis, juvenile mortality (over 1 year) varied between 20 and almost 100% among sites. Correlative data showed that juvenile mortality increased as a function of initial densities (recruitment), predator densities and the availability of preferred coral substrata. A multiple regression showed that these three variables together did not explain significantly more variation in mortality than the single factor showing the strongest relationship. This appeared to be because recruitment, predator densities and preferred coral substrata were all highly correlated, suggesting that one, two or all of these factors may be influencing juvenile mortality rates. One hypothesis was that density-dependent mortality in juveniles was the result of an interaction between predators (which appear to aggregate at high-recruitment sites) and the availability of preferred substrata (predator refuges). We tested this hypothesis by using both laboratory and field experiments to see whether fish predation could significantly alter survivorship of this Damselfish, and whether this impact was dependent upon the coral substratum. The laboratory experiment was designed to test the effects of three common predators (Pseudochromis fuscus, Cephalopholis boenak and Thalassoma lunare) and three different coral substrata that varied in their complexity (Pocillopora damicornis, Acropora nasuta and A. nobilis) on the survival of juvenile Pomacentrus moluccensis. There was a significant interaction between predator species and microhabitat in determining survival. Pseudochromis fuscus and C. boenak were both significantly better at capturing juvenile Damselfish than T. lunare. Juvenile survivorship was significantly better when they were given the more complex corals, Pocillopora damicornis and A. nasuta, compared with those given the open-structured species A. nobilis. This pattern reflects habitat selection in the field. Predators differed in their strike rates and the proportion of strikes that were successful, but all exhibited greater success at prey capture where A. nobilis was provided as shelter. The interaction between the effect of predator species and microhabitat structure on Damselfish survival was tested in the field for a cohort of juvenile Pomacentrus moluccensis. We examined juvenile survival in the presence and absence of two predators that co-occur on natural patch reefs (C. boenak and Pseudochromis fuscus). The experimental patch reefs we used for this purpose were constructed from both high complexity (Pocillopora damicornis) and low complexity (A. nobilis) coral substrata. Both juveniles and predators were translocated to reefs at natural densities. The effects of predation were clearly dependent upon the microhabitat. Reefs of the high-complexity coral with predators supported the same high numbers of Pomacentrus moluccensis as the reefs with no resident predators. However, Damselfish abundance was significantly lower on low-complexity reefs with resident predators, relative to the other treatments. Background rates of loss were high, even on preferred coral in the absence of the manipulated predator, suggesting that transient predators may be even more important than the residents. We suggest that adult abundances in this species were strongly influenced by the densities of different predators and the availability of preferred refuges.
Sandra A Binning - One of the best experts on this subject based on the ideXlab platform.
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Cleaner wrasse indirectly affect the cognitive performance of a Damselfish through ectoparasite removal
Proceedings of the Royal Society B: Biological Sciences, 2018Co-Authors: Sandra A Binning, Simona Colosio, Derek Sun, Joanna Miest, Dominique G Roche, Alexandra S. Grutter, Redouan BsharyAbstract:Cleaning organisms play a fundamental ecological role by removing ectoparasites and infected tissue from client surfaces. We used the well-studied cleaning mutualisms involving the cleaner wrasse, Labroides dimidiatus, to test how client cognition is affected by ectoparasites and whether these effects are mitigated by cleaners. Ambon Damselfish ( Pomacentrus amboinensis) collected from experimental reef patches without cleaner wrasse performed worse in a visual discrimination test than conspecifics from patches with cleaners. Endoparasite abundance also negatively influenced success in this test. Visual discrimination performance was also impaired in Damselfish experimentally infected with gnathiid (Crustacea: Isopoda) ectoparasites. Neither cleaner absence nor gnathiid infection affected performance in spatial recognition or reversal learning tests. Injection with immune-stimulating lipopolysaccharide did not affect visual discrimination performance relative to saline-injected controls, suggesting that cognitive impairments are not due to an innate immune response. Our results highlight the complex, indirect role of cleaning organisms in promoting the health of their clients via ectoparasite removal and emphasize the negative impact of parasites on host's cognitive abilities.
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Cleaner wrasses indirectly affect the cognitive performance of a Damselfish through ectoparasite removal
2018Co-Authors: Sandra A Binning, Simona Colosio, Derek Sun, Joanna Miest, Alexandra S. Grutter, Dominique Roche, Redouan BsharyAbstract:Data and script for "Binning SA, Roche DG, Grutter A, Colosio S, Sun D, Miest J, Bshary R (2018) Cleaner wrasse indirectly affect the cognitive performance of a Damselfish through ectoparasite removal. Proc. R. Soc. B. 20172447. http://dx.doi.org/10.1098/rspb.2017.2447"Please see readMe.tx
