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Differences Between Underwater Visual Census and Baited Remote Underwater Video

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Differences Between Underwater Visual Census and Baited Remote Underwater Video Vol. 400: 19–36, 2010 MARINE ECOLOGY PROGRESS SERIES Published February 11 doi: 10.3354/meps08377 Mar Ecol Prog Ser A comparison of two survey methods: differences between underwater visual census and baited remote underwater video Madhavi A. Colton*, Stephen E. Swearer Department of Zoology, University of Melbourne, Parkville, Victoria 3010, Australia ABSTRACT: Essential to any model, conservation or management plan are measures of the distribu- tion 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 ichthy- ofauna 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. KEY WORDS: Subtidal fish assemblages · Rocky reefs · Diversity · Herbivores · Territoriality · Mobile predators · Sightability index · Taxonomic distinctness · Victoria · Australia Resale or republication not permitted without written consent of the publisher INTRODUCTION time they can spend monitoring a population and fre- quently find themselves in conditions that make obser- Estimates of the abundance and distribution of a spe- vations difficult. Considering this, it is unsurprising cies are essential to any ecological model, though that numerous techniques have been developed to measures of these parameters will often be influenced sample subtidal marine communities, making it essen- by the method chosen to obtain these data. While tial to compare between methods in order to identify the sources of bias within a research protocol may their relative biases. vary, the presence of bias is inevitable (MacNeil et al. Bias in surveys can be caused by factors that are 2008a), leaving it to researchers to identify sources of intrinsic to the species being observed, as well as by bias within their own data. In the marine environment, the survey methodology itself. Although most method- accurately assessing population abundance is very ologies assume that detectability, or the probability of challenging. Researchers are limited in the amount of observing a species, is equal for all species, in reality, *Email: [email protected] © Inter-Research 2010 · www.int-res.com 20 Mar Ecol Prog Ser 400: 19–36, 2010 the fauna of any region is comprised of types of species at surveying these species (Friedlander & DeMartini that are variably detectable (Boulinier et al. 1998, Mac- 2002, Castro & Rosa 2005, Powter & Gladstone 2008) Neil et al. 2008a,b). MacNeil et al. (2008a) found that then there may be little difference between the meth- the greatest source of heterogeneity in detectability ods in measures of taxonomic distinctness. In this was caused by species characteristics, i.e. physical research, we were interested not only in how these 2 traits, behaviour, and life history. To compare between methods differ in various measures of diversity and survey methods and identify biases requires classify- richness, but also in how factors that are intrinsic to a ing the types of species that are differentially detected species may influence how well a method detects a by each method. In this research, we explore how species. Specifically we were interested in the effects intrinsic factors influence the detection capacity of 2 of conspicuousness, crypsis, mobility, territoriality, methods commonly used to survey subtidal fish assem- trophic position and schooling behaviour on detect- blages: underwater visual census (UVC) and baited ability using BRUV and UVC. remote underwater video (BRUV). Conspicuous species are perhaps the easiest to sur- BRUV has been used to survey species for at least vey, with numerous methods developed to measure 30 yr (Miller 1975), though its application has in- their densities. However, being conspicuous alone is creased markedly in recent years, particularly in Aus- not enough to guarantee observation. For example, tralia (e.g. Cappo et al. 2007). BRUV is particularly MacNeil et al. (2008a) found that scarids had a rela- effective at recording a diverse assemblage of species tively low probability of detection despite their physi- (Willis & Babcock 2000, Cappo et al. 2004, Watson et cal conspicuousness, and attributed this incongruity to al. 2005). However, BRUV units deployed in turbulent the species’ highly mobile nature and diver-averse environments are unable to provide measures of behaviour. The behaviour of many fishes changes in absolute density because such measures necessitate the presence of divers (Kulbicki 1998, Watson & Har- that the area surveyed be quantified. This requires vey 2007), which may explain why some researchers detailed information about the dynamics of the bait have found BRUV to be especially effective at observ- odour plume, and the sensory capacity, swimming ing predatory and mobile species, such as elasmo- speed, and behaviour of individual species (Priede & branchs or species that are targeted by fishing (Willis & Merrett 1996, Yau et al. 2001, Farnsworth et al. 2007, Babcock 2000, Cappo et al. 2004, Watson et al. 2005, Heagney et al. 2007), data which are often unavailable Watson & Harvey 2007). Other research, however, for many fishes. The result is that BRUV typically can demonstrates that mobile predators can be accurately only provide a measure of relative abundance, particu- surveyed using UVC (e.g. Friedlander & DeMartini larly in turbulent areas. 2002, Castro & Rosa 2005, Robbins et al. 2006). In our In comparison, UVC has a long history of application research, we investigate differences in how the 2 in surveys of fish assemblages (Brock 1954). The prob- methods measure abundance and richness of both con- lems associated with the use of UVC to estimate spe- spicuous species and mobile predators. cies’ densities have been well documented and can be In the detection spectrum, cryptic species are at the caused by a variety of factors including but not limited opposite end to conspicuous species. These fishes are to a species’ cryptic colouration or secretive behaviour rarely detected in visual surveys, which are well (Sale & Douglas 1981, Kulbicki 1998), a diver’s ability known to underestimate their density (Willis 2001). In to identify and accurately count individuals (Harvey et fact, the only way to accurately survey cryptics may be al. 2004), and a fish’s behavioural response to divers with the application of an ichthyocide (Willis 2001). (Kulbicki 1998, Watson & Harvey 2007). The result of While the chance of detecting cryptic species is low on these biases is that UVC usually underestimates fish a UVC, it is even smaller when using diver-swum density (Sale & Sharp 1983, Edgar et al. 2004). underwater video (Watson et al. 2005). When the Few studies have compared UVC to BRUV, and most underwater video is stationary, as in the case of a of these have found BRUV to be superior to UVC at BRUV, the chance of seeing cryptic species declines measuring diversity (Willis & Babcock 2000, Willis et further (Stobart et al. 2007). In addition to cryptic al. 2000, Watson et al. 2005), though at least one study colouration and secretive behaviour, cryptic species has found the opposite to be true (Stobart et al. 2007). often have small maximum total lengths (TLmax). Inter- To the best of our knowledge, no studies have exam- estingly, MacNeil et al. (2008b) found TLmax to be neg- ined how these 2 methods compare in measures of tax- atively associated with detection probability, and pro- onomic diversity. If BRUV is better at recording mobile posed that the territorial behaviour of the small-bodied predators (Willis & Babcock 2000, Cappo et al. 2004, species in their study compensated for their small size, Watson et al. 2005, Watson & Harvey 2007), including with the result that these small-bodied species were many elasmobranchs, then it may survey a more more detectable than larger-bodied transitory species. diverse assemblage. If, however, UVC is equally good The effect that territoriality has upon survey methodol- Colton & Swearer: Comparison of two underwater survey methods 21 ogy has received little attention in the literature. There Our methodological comparison utilizes
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