Comparison of efficiency of direct observations by scuba diver and indirect observations <i>via</i> video camera for measuring reef‐fish behaviour

Branconi, Rebecca; Wong, Marian Y. L.; Buston, Peter M.

doi:10.1111/jfb.13921

Cited by 14 publications

(9 citation statements)

References 48 publications

(59 reference statements)

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“…Active removal of sediment by damselfishes appears to be less frequent, but not uncommon. Indeed, we observed damselfishes deliberately removing sediment particles by picking them up in their mouths in this experiment (also seen previously in D. marginatus [15]), or blowing them off the coral to clear their preferred roosting areas and to tend to their habitat area [15,77]. Damselfishes also appear to be effective at clearing sediments around the base of coral colonies, excavating areas under the branches.…”

Section: Discussionsupporting

confidence: 73%

Damselfishes alleviate the impacts of sediments on host corals

et al. 2020

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Mutualisms play a critical role in ecological communities; however, the importance and prevalence of mutualistic associations can be modified by external stressors. On coral reefs, elevated sediment deposition can be a major stressor reducing the health of corals and reef resilience. Here, we investigated the influence of severe sedimentation on the mutualistic relationship between small damselfishes ( Pomacentrus moluccensis and Dascyllus aruanus ) and their coral host ( Pocillopora damicornis ). In an aquarium experiment, corals were exposed to sedimentation rates of approximately 100 mg cm −2 d −1 , with and without fishes present, to test whether: (i) fishes influence the accumulation of sediments on coral hosts, and (ii) fishes moderate partial colony mortality and/or coral tissue condition. Colonies with fishes accumulated much less sediment compared with colonies without fishes, and this effect was strongest for colonies with D. aruanus (fivefold less sediment than controls) as opposed to P. moluccensis (twofold less sediment than controls). Colonies with symbiont fishes also had up to 10-fold less sediment-induced partial mortality, as well as higher chlorophyll and protein concentrations. These results demonstrate that fish mutualisms vary in the strength of their benefits, and indicate that some mutualistic or facilitative interactions might become more important for species health and resilience at high-stress levels.

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Section: Discussionsupporting

confidence: 73%

Damselfishes alleviate the impacts of sediments on host corals

et al. 2020

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“…Field observations were made in five two‐hour sample sessions, between 1,100 and 1,300 hr, from 3 to 7 October 2019 (totalling 10 hr). Snorkelling was chosen to allow the observer (KP) to conduct longer and quieter observations in shallow water (Branconi et al., 2019). Data collection was carried out at a distance of 2–6 m from the anvils.…”

Section: Methodsmentioning

confidence: 99%

Multi‐species fish foraging associations during tool use by the graphic tuskfish Choerodon graphicus (De Vis 1885) (Labridae)

Pryor¹,

Milton²

2021

Marine Ecology

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Multi‐species foraging associations occur when one or more species forage together. However, these associations have not yet been studied during tool use in fishes. Observations were made of the graphic tuskfish Choerodon graphicus (De Vis 1885) in New Caledonia to determine whether other fishes attended it during tool‐use events. A new subtype of attendant associations, "scavenging at anvil", formed during 15 of 16 tool‐use events (94%). Six identifiable attendant families were observed: Acanthuridae (surgeonfishes; 3.7% of total attendant fishes), Balistidae (triggerfishes; 11.9%), Chaetodontidae (butterflyfishes; 9.6%), Labridae (wrasses; 19.3%), Pomacanthidae (angelfishes; 0.7%) and Pomacentridae (damselfishes; 54.8%). Anvil choice significantly influenced the assemblages of attendants (p = 1.982e‐10) but the size of C. graphicus did not (p = .4658). C. graphicus sometimes chased attendants but attendants did not behave aggressively towards C. graphicus or other attendants. C. graphicus appeared to be disadvantaged when attendants distracted it during tool use or scavenged its food. Attendants benefitted when they obtained food they could not otherwise access. Attendants may have responded to visual cues such as appearance, body movements and sand clouds, and auditory cues such as the "clack" sound made when a mollusc was struck on an anvil. Future studies should assess the importance of multi‐species fish foraging associations during tool use to the ecology of coral reefs.

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“…Extra field observations were made haphazardly. Data collection was done while snorkelling at a distance of 2–6 m from the anvils to minimize impact on fish activities (Branconi et al ., 2019).…”

Section: Figurementioning

confidence: 99%

Frequent visits to various anvils during tool use by the graphic tuskfish Choerodon graphicus (Labridae)

Pryor¹

2020

Journal of Fish Biology

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This study investigated tool use by the graphic tuskfish Choerodon graphicus in New Caledonia. Anvils included rocks, a conical shell, flat dead corals and a concrete mooring. Sixteen tool-use events were observed in 10 h. A tool-use event often involved more than one anvil (44%). On average, C. graphicus struck prey six times and spent 84 s at an anvil. The only prey items brought to anvils were bivalve and gastropod molluscs. These results provide a foundation for future research on tool use in fishes.

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Comparison of efficiency of direct observations by scuba diver and indirect observations via video camera for measuring reef‐fish behaviour

Cited by 14 publications

References 48 publications

Damselfishes alleviate the impacts of sediments on host corals

Damselfishes alleviate the impacts of sediments on host corals

Multi‐species fish foraging associations during tool use by the graphic tuskfish Choerodon graphicus (De Vis 1885) (Labridae)

Frequent visits to various anvils during tool use by the graphic tuskfish Choerodon graphicus (Labridae)

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