Abundance and spatial overlap of gobies (Gobiidae) in Lough Hyne, Ireland

Costello, Mark J.

doi:10.1007/bf00005868

Cited by 39 publications

(42 citation statements)

References 45 publications

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“…Yet, the field work days were the same and there was no loss in resolution power, a goal when a rapid assess of demersal elasmobranch populations is the fieldwork objective. Not only may the difference in area surveyed be responsible for the found difference, but also the presence of the UVC SCUBA diver could be affecting fish behaviour (Chapman et al 1974;Chapman and Atkinson 1986;Costello 1992), limiting the real value of presence/absence of this species (e.g. Kulbicki 1998).…”

Section: Discussionmentioning

confidence: 99%

Underwater towed video: a useful tool to rapidly assess elasmobranch populations in large marine protected areas

2007

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Elasmobranch stock assessment studies are usually made through fisheries surveys data. However, in large marine protected areas (MPAs) the use of destructive techniques must be dismissed in order to avoid population impacts. In 2005, while conducting a marine habitat survey in two marine Special Areas of Conservation (Sebadales de Playa de Inglés and Franja Marina de Mogán) in south Gran Canary Island (Canary Islands, Spain) with underwater towed video (UTV) and underwater visual census (UVC) transects, we recognized the opportunity rose to assess elasmobranch populations through UTV. Number of observed species and specimens, overall field work effort and total surveyed area were determined and compared between methods. Mean observations per day per unit of time (MOPUT) and mean observations per day per unit of surveyed area (MOPUA) were also compared through Mann-Whitney rank sum statistical test (α=0.05). Data analysis demonstrated that UTV is a very useful tool to rapidly assess elasmobranch populations in large MPAs in good visibility underwater environments. It can assess larger areas than UVC with the same effort (statistically significant difference found for the MOPUT; p=<0.001), leading to more observed species (5 vs 2) and specimens (46 vs 3) per day of work, with no loss in resolution power (MOPUA values were not significantly different between UTV and UVC; p=0.104).

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Section: Discussionmentioning

confidence: 99%

Underwater towed video: a useful tool to rapidly assess elasmobranch populations in large marine protected areas

2007

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“…The design of field surveys thus needs to be clear which habitats, body sizes and taxa it has focused on, and what has been excluded; i.e., how it has 'stratified' sampling. Perhaps the most effective way to place the data into an environmental context is to map the geographic distribution of environmental variables (e.g., depth, salinity, temperature, substratum, topography) and habitats (Costello 1992;Costello and Emblow 2005;Costello et al , 2010aHiscock 2014). These environmental variables can be mapped through 'remote sensing' from satellites, aircraft and ships (Andréfouët et al 2008b(Andréfouët et al , 2011 and can include: seabed depth, topography, and roughness; surface water colour (an estimate of phytoplankton biomass and dominance) and temperature; depth-profiles of density (salinity) and temperature; acoustic signatures of zooplankton and pelagic megafauna; and the distribution and extent of intertidal and shallow-water habitats such as coral reefs, kelp and seagrass beds, mangrove forests, and salt-marshes.…”

Section: Sampling Methodsmentioning

confidence: 99%

Methods for the Study of Marine Biodiversity

Costello

Basher

McLeod

et al. 2016

The GEO Handbook on Biodiversity Observation Networks

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Recognition of the threats to biodiversity and its importance to society has led to calls for globally coordinated sampling of trends in marine ecosystems. As a step to defining such efforts, we review current methods of collecting and managing marine biodiversity data. A fundamental component of marine biodiversity is knowing what, where, and when species are present. However, monitoring methods are invariably biased in what taxa, ecological guilds, and body sizes they collect.

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“…Maximum RD has therefore been used to describe the visual ability of this (Utne, 1997) and other SS foraging planktivorous fish (O'Brien and Evans, 1991). Furthermore, the two-spotted goby is known to decrease its activity and feeding rate with decreasing light, and in the dark they are inactive, 'sleeping' on the kelp or rocks (Gordon, 1983;Costello, 1992). Thus, in the present study their feeding motivation should be quite low, since very low illumination levels were used.…”

Section: Discussionmentioning

confidence: 99%

Spectral sensitivity of the two-spotted gobyGobiusculus flavescens(Fabricius): a physiological and behavioural study

Utne‐Palm

Bowmaker

2006

Journal of Experimental Biology

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SUMMARY Microspectrophotometry of Gobiusculus flavescens photoreceptors revealed a single rod visual pigment (λmaxat 508 nm) and the three cone pigments (λmax 456, 531 and 553 nm). The cone population was dominated by identical double cones containing the middle-wave-sensitive (MWS)pigment, but with a small number of non-identical MWS/LWS(long-wave-sensitive) and identical LWS double cones. Small populations of large single cones also contained either the MWS or LWS pigment. The short-wave-sensitive (SWS) pigment was found in small single cones. Lens transmission was great reduced below 410 nm. The spectral sensitivity of the behaviourally determined reaction distance(RD) to prey at a high irradiance level 0.5 μmol m-2s-1) correlated with the maximum sensitivity of the MWS cones, both peaking around 530 nm. However, at a lower irradiance level (0.015 μmol m-2 s-1)such a correlation was not so apparent. The RD was greatly reduced, though still maintaining a peak around 530-550 nm, but with a relatively smaller reduction in RD at shorter wavelengths. Optomotor behaviour displayed a somewhat similar spectral sensitivity to the RD responses at the higher light intensity. However, the peak was at slightly longer wavelengths at 550 nm, suggesting a greater input from LWS cones to the optomotor response.

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Abundance and spatial overlap of gobies (Gobiidae) in Lough Hyne, Ireland

Cited by 39 publications

References 45 publications

Underwater towed video: a useful tool to rapidly assess elasmobranch populations in large marine protected areas

Underwater towed video: a useful tool to rapidly assess elasmobranch populations in large marine protected areas

Methods for the Study of Marine Biodiversity

Spectral sensitivity of the two-spotted gobyGobiusculus flavescens(Fabricius): a physiological and behavioural study

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