Behaviour of temperate and sub-tropical reef fishes towards a stationary SCUBA diver

Watson, Dianne L.; Harvey, Euan S.

doi:10.1080/10236240701393263

Cited by 84 publications

(71 citation statements)

References 32 publications

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“…For example, MacNeil et al (2008a) found that scarids had a relatively low probability of detection despite their physical conspicuousness, and attributed this incongruity to the species' highly mobile nature and diver-averse behaviour. The behaviour of many fishes changes in the presence of divers (Kulbicki 1998, Watson & Harvey 2007, which may explain why some researchers have found BRUV to be especially effective at observing predatory and mobile species, such as elasmobranchs or species that are targeted by fishing , Cappo et al 2004, Watson et al 2005, Watson & Harvey 2007. Other research, however, demonstrates that mobile predators can be accurately surveyed using UVC (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…After deployment, the boat motored away from the area. We deployed 2 BRUV units concurrently at a minimum of 500 m apart to minimize the overlap of bait odour plumes , Harvey et al 2007, Heagney et al 2007). Where BRUV units could not be separated spatially, replicates occurring < 500 m apart were deployed at least 1.5 h apart.…”

Section: Methodsmentioning

confidence: 99%

“…While it is tempting to suppose that BRUV does not survey herbivores at all, this is not the case. Harvey et al (2007) found that herbivores were attracted to a BRUV more than to an unbaited video unit, with attraction most likely being to the activity around the frame rather than to the bait itself. However, this study did not compare herbivore densities measured using BRUV to those measured using UVC.…”

Section: Introductionmentioning

confidence: 99%

“…The problems associated with the use of UVC to estimate species' densities have been well documented and can be caused by a variety of factors including but not limited to a species' cryptic colouration or secretive behaviour (Sale & Douglas 1981, Kulbicki 1998, a diver's ability to identify and accurately count individuals (Harvey et al 2004), and a fish's behavioural response to divers (Kulbicki 1998, Watson & Harvey 2007. The result of these biases is that UVC usually underestimates fish density (Sale & Sharp 1983, Edgar et al 2004.…”

Section: Introductionmentioning

confidence: 99%

“…To the best of our knowledge, no studies have examined how these 2 methods compare in measures of taxonomic diversity. If BRUV is better at recording mobile predators , Cappo et al 2004, Watson et al 2005, Watson & Harvey 2007), including many elasmobranchs, then it may survey a more diverse assemblage. If, however, UVC is equally good at surveying these species (Friedlander & DeMartini 2002, Castro & Rosa 2005, Powter & Gladstone 2008 then there may be little difference between the methods in measures of taxonomic distinctness.…”

Section: Introductionmentioning

confidence: 99%

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A comparison of two survey methods: differences between underwater visual census and baited remote underwater video

Colton¹,

Swearer²

2010

Mar. Ecol. Prog. Ser.

131

114

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Essential to any model, conservation or management plan are measures of the distribution and abundance of a species. Countless methods for estimating these parameters exist, making it essential to assess the limitations and biases associated with a particular sampling protocol. Here, we compare between 2 methods commonly used to survey nearshore fish assemblages. Although most commonly employed, underwater visual census (UVC) may yield biased estimates of abundance depending on the strength of a fish's behavioural response (i.e. avoidance, attraction) to the presence of divers. Baited remote underwater video (BRUV) techniques have shown promise in overcoming some of the limitations of UVC, but are unable to provide an absolute measure of density in turbulent environments. We compare the abilities of these 2 methods to survey the nearshore rocky reef ichthyofauna of Southeast Australia. We found that relative to BRUV, UVC recorded more individuals (in terms of all species, herbivores, cryptic species, and most territorial species), higher richness at both the species and family level, and higher biodiversity as measured using the Shannon Index. These findings remain even when the data were adjusted for differences in sampling effort. In contrast, BRUV recorded proportionally more mobile predators, and a more taxonomically distinct population, though only when taxonomic evenness was not taken into account. Twenty species were unique to UVC and 17 species unique to BRUV. Considering this, studies aimed at cataloguing diversity should apply multiple methods. However, when logistical or financial constraints limit biodiversity studies to only 1 method, UVC will likely provide a more complete estimate of temperate reef fish diversity than BRUV.

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Section: Introductionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A comparison of two survey methods: differences between underwater visual census and baited remote underwater video

Colton¹,

Swearer²

2010

Mar. Ecol. Prog. Ser.

131

114

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Alien turf: Overfishing, overgrazing and invader domination in south‐eastern Levant reef ecosystems

Rilov

Peleg

Yeruham

et al. 2017

Aquatic Conservation

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Coastal reefs are highly diverse marine ecosystems that in many regions suffer today from growing pressures by human activities. Among the most highly‐stressed are those found in the Levantine basin (south‐eastern Mediterranean Sea). The Levant represents the trailing‐edge of distribution of native species where they are exposed to the most extreme temperature and salinity conditions, and the region is also fast‐warming and exposed to a great many alien species and strong fishing pressure. In this study, the ecological state of reefs in the south‐eastern Levant was assessed quantitatively (including inside a small marine reserve) using current, extensive, survey data with reference to anecdotal historical information on their more pristine past. The results of very extensive subtidal community surveys that were conducted in north Israel indicate that reefs in this area are currently dominated by turf‐forming algae and aliens, and sustain low numbers of top predators. Specifically, it was found that on these Levant reefs: (1) commercial species represent a very small part of the fish assemblage (except inside the reserve); (2) alien species constitute a considerable portion (23–44%) of the fish assemblage (including in the reserve) and 95–99% of epi‐benthic molluscs, including inside the marine reserve; and (3) turf barrens are the dominant substrate cover, while cover of native brown algae canopy is limited to small patches occurring only during winter and spring. These findings suggest that the Levant reefs have been highly transformed by overfishing and alien invasions, and probably also climate change, and that even well managed marine reserves had little effect on alien species presence. From a biogeographic‐conservation perspective, as both warming and bioinvasions continue in the Mediterranean, it is expected that this degraded reef state will gradually advance westward. Alleviating fishing pressure with marine reserves might make the reefs more resilient to these regional pressures, but alien invaders will remain a dominant feature in the system. Therefore, a more realistic conservation target might be the preservation or restoration of ecosystem functions rather than the original native biodiversity.

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Intergrading reef communities across discrete seaweed habitats in a temperate–tropical transition zone: Lessons for species reshuffling in a warming ocean

Mulders

Filbee‐Dexter

Bell

et al. 2022

Ecology and Evolution

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Behaviour of temperate and sub-tropical reef fishes towards a stationary SCUBA diver

Cited by 84 publications

References 32 publications

A comparison of two survey methods: differences between underwater visual census and baited remote underwater video

A comparison of two survey methods: differences between underwater visual census and baited remote underwater video

Alien turf: Overfishing, overgrazing and invader domination in south‐eastern Levant reef ecosystems

Intergrading reef communities across discrete seaweed habitats in a temperate–tropical transition zone: Lessons for species reshuffling in a warming ocean

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