Body shape and mode of propulsion do not constrain routine swimming in coral reef fishes

Satterfield, Darien R.; Claverie, Thomas; Wainwright, Peter C.

doi:10.1111/1365-2435.14227

Cited by 5 publications

(3 citation statements)

References 113 publications

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“…The maximal speed v max of the studied species should then be determined by retrieving the critical swimming speed U crit established through laboratory experiments with velocity tests or based on field speed performance (Fulton 2007). It could also be estimated from present video measurements if stereo cameras are used (Satterfield et al 2023). Then, the minimal time t min needed for an individual to move from one camera to another is computed ( see Box 1, step 2) as t min = d / v max .…”

Section: Materials and Proceduresmentioning

confidence: 99%

A new framework for estimating abundance of animals using a network of cameras

Magneville,

Brissaud,

Fleuré

et al. 2024

Limnology & Ocean Methods

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While many ecology studies require estimations of species abundance, doing so for mobile animals in an accurate, non‐invasive manner remains a challenge. One popular stopgap method involves the use of remote video‐based surveys using several cameras, but abundance estimates derived from this method are computed with conservative metrics (e.g., maxN computed as the maximum number of individuals seen simultaneously on a single video). We propose a novel methodological framework based on a remote‐camera network characterized by known positions and non‐overlapping field‐of‐views. This approach involves a temporal synchronization of videos and a maximal speed estimate for studied species. Such a design allows computing a new abundance metric called Synchronized maxN (SmaxN). We provide a proof‐of‐concept of this approach with a network of nine remote underwater cameras that recorded fish for three periods of 1 h on a fringing reef in Mayotte (Western Indian Ocean). We found that abundance estimation with SmaxN yielded up to four times higher values than maxN among the six fish species studied. SmaxN performed better with an increasing number of cameras or longer recordings. We also found that using a network of synchronized cameras for a short time period performed better than using a few cameras for a long duration. The SmaxN algorithm can be applied to many video‐based approaches. We built an open‐sourced R package to encourage its use by ecologists and managers using video‐based censuses, as well as to allow for replicability with SmaxN metric.

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Section: Materials and Proceduresmentioning

confidence: 99%

A new framework for estimating abundance of animals using a network of cameras

Magneville,

Brissaud,

Fleuré

et al. 2024

Limnology & Ocean Methods

Self Cite

View full text Add to dashboard Cite

show abstract

“…From these data, inferences about animals' movements (e.g. Satterfield et al, 2023; Vivancos & Closs, 2015), behaviours and interactions (e.g. Ballesta et al, 2014; Janisch et al, 2021), and physiology (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Boldt et al, 2018; Langlois et al, 2020) and behaviours (e.g. feeding behaviour: Lester et al, 2021; Vivancos & Closs, 2015, swimming behaviour: Satterfield et al, 2023; Schiettekatte et al, 2022; Williams et al, 2010, and avoidance behaviour: Watson & Harvey, 2007). However, stereo data collected are often limited to ~1.5 h of continuous footage owing to many cameras operating with short battery lives.…”

Section: Introductionmentioning

confidence: 99%

A low‐cost, long‐running, open‐source stereo camera for tracking aquatic species and their behaviours

Dunkley,

Drewnicki

et al. 2023

Methods Ecol Evol

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Ecologists are now widely utilising video data to quantify the behaviours and interactions of animals in the wild. This process can be facilitated by collecting videos in stereo, which can provide information about animals' positions, movements and behaviours in three‐dimensions (3D). However, there are no published designs that can collect underwater 3D stereo data at high spatial and temporal resolutions for extended periods (days). Here, we present complete hardware and software solutions for a long‐running, open‐source, underwater stereo camera rig, costing £1337. This stereo camera can continuously record aquatic species and their behaviours/interactions in high resolution (1080 p and 30 fps) and in 3D, over multiple days. We provide full design guides for the cameras and a travel‐friendly rig, and include guidance and open‐source code for calibrating the cameras in space and time. We also show how these cameras could be used to track animals' body parts and positions, and how their size, posture and behaviour can be inferred. This stereo camera will facilitate the collection of high‐resolution ecological and behavioural data, such as affiliative, agonistic or trophic interactions between species, which can inform us about the health and structure of ecosystems. These data will assist ecologists and conservationists in monitoring and understanding the impacts of current environmental pressures on ecosystem functioning.

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Tolerance threshold of a pelagic species in China to total dissolved gas supersaturation: from the perspective of survival characteristics and swimming ability

Wang,

et al. 2024

Conservation Physiology

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Total dissolved gas (TDG) supersaturation downstream of dams can occur in the Yangtze River basin and is known to cause stress and even death in fish. Consequently, it is important to establish tolerance thresholds of endemic fish to protect local aquatic resources. We conducted experiments to assess survival characteristics and swimming ability of bighead carp, an important commercial fish dwelling in the Yangtze River, to evaluate its tolerance threshold to TDG supersaturation. The typical external symptoms of gas bubble trauma (GBT) were observed and the time when the fish lost equilibrium and died were recorded. The results showed that the mortality occurred when TDG level exceeded 125%, with obvious symptoms such as exophthalmos and bubbles on the head. The interval between loss of equilibrium and mortality decreased with an increase in TDG level. Neither exposure time nor TDG level significantly affected the critical swimming speed (Ucrit) of fish exposed to non-lethal exposure (110%, 120% and 125% TDG) over a 7 day period. Significant reductions in Ucrit were found under 130% and 135% TDG conditions when the exposure lasted 52.0 h and 42.9 h, respectively. The Ucrit also significantly decreased after exposure of 1.6 h under 140% TDG condition. Moreover, after exposure to 140% TDG for 39.2 h, 135% TDG for 56.5 h and 130% TDG for 95.9 h, bighead carp were transferred into air saturated water to recover for 24 h or 48 h; however, swimming performance remained impaired. The results of this study indicate that 125% TDG was the highest TDG level where limited mortality was observed and the swimming ability was not impaired, showing that 125% TDG can be set as the tolerance threshold of this species to guide the operation of dams in the Yangtze River Basin.

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Body shape and mode of propulsion do not constrain routine swimming in coral reef fishes

Cited by 5 publications

References 113 publications

A new framework for estimating abundance of animals using a network of cameras

A new framework for estimating abundance of animals using a network of cameras

A low‐cost, long‐running, open‐source stereo camera for tracking aquatic species and their behaviours

Tolerance threshold of a pelagic species in China to total dissolved gas supersaturation: from the perspective of survival characteristics and swimming ability

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