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Hardy AR, Hale ME. Extraoral Taste Buds on the Paired Fins of Damselfishes. Integr Org Biol 2022; 4:obac035. [PMID: 36060866 PMCID: PMC9428928 DOI: 10.1093/iob/obac035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 07/21/2022] [Accepted: 08/05/2022] [Indexed: 11/20/2022] Open
Abstract
Some fish species have taste buds on the surface of their bodies and fins, as well as in the oral cavity. The extraoral taste system of fish has traditionally been studied in species that inhabit environments and/or employ feeding strategies where vision is limited. Here we examined taste sensation in a new ecological context by investigating the paired fins of damselfish (Pomacentridae), a group of diurnal midwater fishes that inhabit the light-rich waters of coral reefs. Immunohistochemistry demonstrated the presence of taste buds on the paired fins of Chromis viridis, including on the distal tips of elongate leading-edge pelvic fin rays, where they are particularly densely packed, suggesting specialization for chemosensation. Similar anatomical results were also recorded from two other species, Pomacentrus amboinensis and Pomacentrus coelestis. We found that afferent pectoral fin nerves of C. viridis responded to a food-derived stimulus. By investigating the extraoral taste system in a new phylogenetic and ecological context, these results show that taste buds on fins are more widespread amongst fish than previously known and are present even in highly visual environments.
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Affiliation(s)
- Adam R Hardy
- Department of Organismal Biology and Anatomy, The University of Chicago , 1027 E. 57th Street, Chicago, IL 60637, USA
| | - Melina E Hale
- Department of Organismal Biology and Anatomy, The University of Chicago , 1027 E. 57th Street, Chicago, IL 60637, USA
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2
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Living in mixed species groups promotes predator learning in degraded habitats. Sci Rep 2021; 11:19335. [PMID: 34588494 PMCID: PMC8481234 DOI: 10.1038/s41598-021-98224-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 08/17/2021] [Indexed: 11/08/2022] Open
Abstract
Living in mix-species aggregations provides animals with substantive anti-predator, foraging and locomotory advantages while simultaneously exposing them to costs, including increased competition and pathogen exposure. Given each species possess unique morphology, competitive ability, parasite vulnerability and predator defences, we can surmise that each species in mixed groups will experience a unique set of trade-offs. In addition to this unique balance, each species must also contend with anthropogenic changes, a relatively new, and rapidly increasing phenomenon, that adds further complexity to any system. This complex balance of biotic and abiotic factors is on full display in the exceptionally diverse, yet anthropogenically degraded, Great Barrier Reef of Australia. One such example within this intricate ecosystem is the inability of some damselfish to utilize their own chemical alarm cues within degraded habitats, leaving them exposed to increased predation risk. These cues, which are released when the skin is damaged, warn nearby individuals of increased predation risk and act as a crucial associative learning tool. Normally, a single exposure of alarm cues paired with an unknown predator odour facilitates learning of that new odour as dangerous. Here, we show that Ambon damselfish, Pomacentrus amboinensis, a species with impaired alarm responses in degraded habitats, failed to learn a novel predator odour as risky when associated with chemical alarm cues. However, in the same degraded habitats, the same species learned to recognize a novel predator as risky when the predator odour was paired with alarm cues of the closely related, and co-occurring, whitetail damselfish, Pomacentrus chrysurus. The importance of this learning opportunity was underscored in a survival experiment which demonstrated that fish in degraded habitats trained with heterospecific alarm cues, had higher survival than those we tried to train with conspecific alarm cues. From these data, we conclude that redundancy in learning mechanisms among prey guild members may lead to increased stability in rapidly changing environments.
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3
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Chivers DP, McCormick MI, Fakan EP, Edmiston JW, Ferrari MCO. Coral degradation impairs learning of non‐predators by Whitetail damselfish. Funct Ecol 2021. [DOI: 10.1111/1365-2435.13781] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
| | - Mark I. McCormick
- ARC Centre of Excellence for Coral Reef Studies, and College of Marine & Environmental Sciences James Cook University Townsville Qld Australia
| | - Eric P. Fakan
- ARC Centre of Excellence for Coral Reef Studies, and College of Marine & Environmental Sciences James Cook University Townsville Qld Australia
| | - Jake W. Edmiston
- ARC Centre of Excellence for Coral Reef Studies, and College of Marine & Environmental Sciences James Cook University Townsville Qld Australia
| | - Maud C. O. Ferrari
- Department of Biomedical Sciences WCVMUniversity of Saskatchewan Saskatoon SK Canada
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4
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McCormick MI, Chivers DP, Ferrari MCO, Blandford MI, Nanninga GB, Richardson C, Fakan EP, Vamvounis G, Gulizia AM, Allan BJM. Microplastic exposure interacts with habitat degradation to affect behaviour and survival of juvenile fish in the field. Proc Biol Sci 2020; 287:20201947. [PMID: 33109008 DOI: 10.1098/rspb.2020.1947] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Coral reefs are degrading globally due to increased environmental stressors including warming and elevated levels of pollutants. These stressors affect not only habitat-forming organisms, such as corals, but they may also directly affect the organisms that inhabit these ecosystems. Here, we explore how the dual threat of habitat degradation and microplastic exposure may affect the behaviour and survival of coral reef fish in the field. Fish were caught prior to settlement and pulse-fed polystyrene microplastics six times over 4 days, then placed in the field on live or dead-degraded coral patches. Exposure to microplastics or dead coral led fish to be bolder, more active and stray further from shelter compared to control fish. Effect sizes indicated that plastic exposure had a greater effect on behaviour than degraded habitat, and we found no evidence of synergistic effects. This pattern was also displayed in their survival in the field. Our results highlight that attaining low concentrations of microplastic in the environment will be a useful management strategy, since minimizing microplastic intake by fishes may work concurrently with reef restoration strategies to enhance the resilience of coral reef populations.
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Affiliation(s)
- Mark I McCormick
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia
| | - Douglas P Chivers
- Department of Biology, University of Saskatchewan, Saskatoon SK S7N 5E2, Canada
| | - Maud C O Ferrari
- Department of Biomedical Sciences, WCVM, University of Saskatchewan, Saskatoon SK S7 W 5B4, Canada
| | - Makeely I Blandford
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia
| | - Gerrit B Nanninga
- School of Life Sciences, University of Essex, Colchester CO4 3SQ, UK.,Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK
| | - Celia Richardson
- Department of Marine Science, University of Otago, Dunedin 9054, New Zealand
| | - Eric P Fakan
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia
| | - George Vamvounis
- College of Sciences and Engineering, James Cook University, Townsville, QLD 4811, Australia
| | - Alexandra M Gulizia
- College of Sciences and Engineering, James Cook University, Townsville, QLD 4811, Australia
| | - Bridie J M Allan
- Department of Marine Science, University of Otago, Dunedin 9054, New Zealand
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5
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Ferrari MCO, McCormick MI, Fakan E, Barry R, Chivers DP. The fading of fear effects due to coral degradation is modulated by community composition. Funct Ecol 2020. [DOI: 10.1111/1365-2435.13655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Maud C. O. Ferrari
- Department of Biomedical Sciences WCVMUniversity of Saskatchewan Saskatoon SK Canada
| | - Mark I. McCormick
- Department of Marine Biology and Aquaculture James Cook University Townsville QLD Australia
- ARC Centre of Excellence for Coral Reef Studies James Cook University Townsville QLD Australia
| | - Eric Fakan
- Department of Marine Biology and Aquaculture James Cook University Townsville QLD Australia
| | - Randall Barry
- Department of Marine Biology and Aquaculture James Cook University Townsville QLD Australia
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6
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Habitat degradation and predators have independent trait-mediated effects on prey. Sci Rep 2019; 9:15705. [PMID: 31673067 PMCID: PMC6823502 DOI: 10.1038/s41598-019-51798-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 10/07/2019] [Indexed: 11/13/2022] Open
Abstract
Coral reefs are degrading globally leading to a catastrophic loss of biodiversity. While shifts in the species composition of communities have been well documented associated with habitat change, the mechanisms that underlie change are often poorly understood. Our study experimentally examines the effects of coral degradation on the trait-mediated effects of predators on the morphology, behaviour and performance of a juvenile coral reef fish. Juvenile damselfish were exposed to predators or controls (omnivore or nothing) in seawater that had flowed over either live or dead-degraded coral over a 45d period. No interaction between water source and predator exposure was found. However, fish exposed to degraded water had larger false eyespots relative to the size of their true eyes, and were more active, both of which may lead to a survival advantage. Non-consumptive effects of predators on prey occurred regardless of water source and included longer and deeper bodies, large false eyespots that may distract predator strikes away from the vulnerable head region, and shorter latencies in their response to a simulated predator strike. Research underscores that phenotypic plasticity may assist fishes in coping with habitat degradation and promote greater resilience to habitat change than may otherwise be predicted.
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McCormick MI, Ferrari MC, Fakan EP, Barry RP, Chivers DP. Diet cues and their utility for risk assessment in degraded habitats. Anim Behav 2019. [DOI: 10.1016/j.anbehav.2019.04.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Chivers DP, McCormick MI, Fakan EP, Barry RP, Edmiston JW, Ferrari MCO. Coral degradation alters predator odour signatures and influences prey learning and survival. Proc Biol Sci 2019; 286:20190562. [PMID: 31138070 DOI: 10.1098/rspb.2019.0562] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Habitat degradation is a key factor leading to the global loss of biodiversity. This problem is particularly acute in coral reef ecosystems. We investigated whether recognition of predator odours by damselfish was influenced by coral degradation and whether these changes altered survival in the wild. We taught whitespot damselfish to recognize the odour of a predator in the presence of live/healthy coral or dead/degraded coral. Fish were tested for a response to predator odours in environments that matched their conditioning environment or in environments that were mismatched. Next, we taught blue damselfish to recognize the odour of three common reef predators in live and degraded coral environments and then stocked them onto live or degraded patch reefs, where we monitored their subsequent response to predator odour along with their survival. Damselfish learned to recognize predator odours in both coral environments, but the intensity of their antipredator response was much greater when the conditioning and test environments matched. Fish released on degraded coral had about 50% higher survival if they had been trained in the presence of degraded coral rather than live coral. Altering the intensity of antipredator responses could have rather profound consequences on population growth.
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Affiliation(s)
- D P Chivers
- 1 Department of Biology, University of Saskatchewan , Saskatoon, Saskatchewan, Canada S7N 5E2
| | - M I McCormick
- 2 ARC Centre of Excellence for Coral Reef Studies, and College of Marine & Environmental Sciences, James Cook University , Townsville, Queensland 4811 , Australia
| | - E P Fakan
- 2 ARC Centre of Excellence for Coral Reef Studies, and College of Marine & Environmental Sciences, James Cook University , Townsville, Queensland 4811 , Australia
| | - R P Barry
- 2 ARC Centre of Excellence for Coral Reef Studies, and College of Marine & Environmental Sciences, James Cook University , Townsville, Queensland 4811 , Australia
| | - J W Edmiston
- 2 ARC Centre of Excellence for Coral Reef Studies, and College of Marine & Environmental Sciences, James Cook University , Townsville, Queensland 4811 , Australia
| | - M C O Ferrari
- 3 Department of Biomedical Sciences, WCVM, University of Saskatchewan , Saskatoon, Saskatchewan, Canada S7W 5B4
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McCormick MI, Fakan EP, Nedelec SL, Allan BJM. Effects of boat noise on fish fast-start escape response depend on engine type. Sci Rep 2019; 9:6554. [PMID: 31024063 PMCID: PMC6484016 DOI: 10.1038/s41598-019-43099-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 04/12/2019] [Indexed: 12/02/2022] Open
Abstract
Vessel noise represents a relatively recent but rapidly increasing form of pollution, which affects the many organisms that use sound to inform their behavioural decisions. Recent research shows that anthropogenic noise can lead to reduced responsiveness to risk and higher mortality. The current laboratory experiment determined whether the playback of noise from motorboats powered by two- or four-stroke outboard engines affected the kinematics of the fast-start response in a juvenile coral reef fish, and the time scale over which the effects may occur. Results show that the two engine types produce slightly different sound spectra, which influence fish differently. Playback of 2-stroke engines had the greatest effect on activity, but only for a brief period (45 s). While noise from 4-stroke outboard engines affected fast-start kinematics, they had half the impact of noise from 2-stroke engines. Two-stroke engine noise affected routine swimming more than 4-stroke engines, while 4-stroke noise had a greater effect on the speed at which fish responded to a startle. Evidence suggests that the source of the noise pollution will have a major influence on the way marine organisms will respond, and this gives managers an important tool whereby they may reduce the effects of noise pollution on protected communities.
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Affiliation(s)
- Mark I McCormick
- ARC Centre of Excellence for Coral Reef Studies, and Department of Marine Biology and Aquaculture, James Cook University, Townsville, Queensland, 4811, Australia.
| | - Eric P Fakan
- ARC Centre of Excellence for Coral Reef Studies, and Department of Marine Biology and Aquaculture, James Cook University, Townsville, Queensland, 4811, Australia
| | - Sophie L Nedelec
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Geoffrey Pope, Stocker Road, Exeter, EX4 4QD, UK
| | - Bridie J M Allan
- ARC Centre of Excellence for Coral Reef Studies, and Department of Marine Biology and Aquaculture, James Cook University, Townsville, Queensland, 4811, Australia.,Department of Marine Science, University of Otago, Dunedin, 9054, New Zealand
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Mitchell MD, Crane AL, Bairos-Novak KR, Ferrari MCO, Chivers DP. Olfactory cues of habitats facilitate learning about landscapes of fear. Behav Ecol 2018. [DOI: 10.1093/beheco/ary024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Matthew D Mitchell
- Department of Biological Sciences, Florida International University, North Miami, FL, USA
- Department of Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, SK, Canada
| | - Adam L Crane
- Department of Biology, University of Saskatchewan, Saskatoon, SK, Canada
| | | | - Maud C O Ferrari
- Department of Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, SK, Canada
| | - Douglas P Chivers
- Department of Biology, University of Saskatchewan, Saskatoon, SK, Canada
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Pratchett MS, Thompson CA, Hoey AS, Cowman PF, Wilson SK. Effects of Coral Bleaching and Coral Loss on the Structure and Function of Reef Fish Assemblages. ECOLOGICAL STUDIES 2018. [DOI: 10.1007/978-3-319-75393-5_11] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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12
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McCormick MI, Barry RP, Allan BJM. Algae associated with coral degradation affects risk assessment in coral reef fishes. Sci Rep 2017; 7:16937. [PMID: 29208978 PMCID: PMC5717098 DOI: 10.1038/s41598-017-17197-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 11/22/2017] [Indexed: 01/26/2023] Open
Abstract
Habitat degradation alters the chemical landscape through which information about community dynamics is transmitted. Olfactory information is crucial for risk assessment in aquatic organisms as predators release odours when they capture prey that lead to an alarm response in conspecific prey. Recent studies show some coral reef fishes are unable to use alarm odours when surrounded by dead-degraded coral. Our study examines the spatial and temporal dynamics of this alarm odour-nullifying effect, and which substratum types may be responsible. Field experiments showed that settlement-stage damselfish were not able to detect alarm odours within 2 m downcurrent of degraded coral, and that the antipredator response was re-established 20-40 min after transferral to live coral. Laboratory experiments indicate that the chemicals from common components of the degraded habitats, the cyanobacteria, Okeania sp., and diatom, Pseudo-nitzschia sp.prevented an alarm odour response. The same nullifying effect was found for the common red algae, Galaxauria robusta, suggesting that the problem is of a broader nature than previously realised. Those fish species best able to compensate for a lack of olfactory risk information at key times will be those potentially most resilient to the effects of coral degradation that operate through this mechanism.
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Affiliation(s)
- Mark I McCormick
- ARC Centre of Excellence for Coral Reef Studies, and Department of Marine Biology and Aquaculture, James Cook University, Townsville, Queensland, 4811, Australia.
| | - Randall P Barry
- ARC Centre of Excellence for Coral Reef Studies, and Department of Marine Biology and Aquaculture, James Cook University, Townsville, Queensland, 4811, Australia
| | - Bridie J M Allan
- ARC Centre of Excellence for Coral Reef Studies, and Department of Marine Biology and Aquaculture, James Cook University, Townsville, Queensland, 4811, Australia
- Institute of Marine Research, Bergen, Norway
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Natt M, Lönnstedt OM, McCormick MI. Coral reef fish predator maintains olfactory acuity in degraded coral habitats. PLoS One 2017; 12:e0179300. [PMID: 28658295 PMCID: PMC5489151 DOI: 10.1371/journal.pone.0179300] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Accepted: 05/26/2017] [Indexed: 11/30/2022] Open
Abstract
Coral reefs around the world are rapidly degrading due to a range of environmental stressors. Habitat degradation modifies the sensory landscape within which predator-prey interactions occur, with implications for olfactory-mediated behaviours. Predator naïve settlement-stage damselfish rely on conspecific damage-released odours (i.e., alarm odours) to inform risk assessments. Yet, species such as the Ambon damselfish, Pomacentrus amboinensis, become unable to respond appropriately to these cues when living in dead-degraded coral habitats, leading to increased mortality through loss of vigilance. Reef fish predators also rely on odours from damaged prey to locate, assess prey quality and engage in prey-stealing, but it is unknown whether their responses are also modified by the change to dead-degraded coral habitats. Implications for prey clearly depend on how their predatory counterparts are affected, therefore the present study tested whether olfactory-mediated foraging responses in the dusky dottyback, Pseudochromis fuscus, a common predator of P. amboinensis, were similarly affected by coral degradation. A y-maze was used to measure the ability of Ps. fuscus to detect and move towards odours, against different background water sources. Ps. fuscus were exposed to damage-released odours from juvenile P. amboinensis, or a control cue of seawater, against a background of seawater treated with either healthy or dead-degraded hard coral. Predators exhibited an increased time allocation to the chambers of y-mazes injected with damage-released odours, with comparable levels of response in both healthy and dead-degraded coral treated waters. In control treatments, where damage-released odours were replaced with a control seawater cue, fish showed no increased preference for either chamber of the y-maze. Our results suggest that olfactory-mediated foraging behaviours may persist in Ps. fuscus within dead-degraded coral habitats. Ps. fuscus may consequently gain a sensory advantage over P. amboinensis, potentially altering the outcome of predator-prey interactions.
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Affiliation(s)
- Michael Natt
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Queensland, Australia
- Department of Marine Biology and Aquaculture, James Cook University, Townsville, Queensland, Australia
| | - Oona M. Lönnstedt
- Department of Ecology and Genetics, Limnology, Uppsala University, Uppsala, Sweden
| | - Mark I. McCormick
- ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Queensland, Australia
- Department of Marine Biology and Aquaculture, James Cook University, Townsville, Queensland, Australia
- * E-mail:
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14
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McCormick MI, Allan BJM. Interspecific differences in how habitat degradation affects escape response. Sci Rep 2017; 7:426. [PMID: 28348362 PMCID: PMC5428724 DOI: 10.1038/s41598-017-00521-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 03/03/2017] [Indexed: 12/20/2022] Open
Abstract
Degradation of habitats is widespread and a leading cause of extinctions. Our study determined whether the change in the chemical landscape associated with coral degradation affected the way three fish species use olfactory information to optimize their fast-start escape response. Water from degraded coral habitats affected the fast-start response of the three closely-related damselfishes, but its effect differed markedly among species. The Ward's damselfish (Pomacentrus wardi) was most affected by water from degraded coral, and displayed shorter distances covered in the fast-start and slower escape speeds compared to fish in water from healthy coral. In the presence of alarm odours, which indicate an imminent threat, the Ambon damsel (P. amboinensis) displayed enhanced fast-start performance in water from healthy coral, but not when in water from degraded coral. In contrast, while the white-tailed damsel (P. chrysurus) was similarly primed by its alarm odour, the elevation of fast start performance was not altered by water from degraded coral. These species-specific responses to the chemistry of degraded water and alarm odours suggest differences in the way alarm odours interact with the chemical landscape, and differences in the way species balance information about threats, with likely impacts on the survival of affected species in degraded habitats.
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Affiliation(s)
- Mark I McCormick
- ARC Centre of Excellence for Coral Reef Studies and Department of Marine Biology and Aquaculture, James Cook University, Townsville, QLD 4811, Australia.
| | - Bridie J M Allan
- ARC Centre of Excellence for Coral Reef Studies and Department of Marine Biology and Aquaculture, James Cook University, Townsville, QLD 4811, Australia
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