Habitat use and spatial segregation of adult spottail sharks <i>Carcharhinus sorrah</i> in tropical nearshore waters

Knip, Danielle M.; Heupel, Michelle R.; Simpfendorfer, Colin A.

doi:10.1111/j.1095-8649.2012.03223.x

Cited by 53 publications

(40 citation statements)

References 35 publications

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“…Methods for finding centers of activity (COA) based on relative detections at different receivers (Simpfendorfer and Heupel 2002) have been increasingly popular for improving the positioning of coral reef animals with coded passive acoustic tags (Marshell et al 2012;Knip et al 2012). COA and other inferential methods based on linear decrease of DP with distance must be used with great care in coral reefs.…”

Section: Discussionmentioning

confidence: 99%

Topography and biological noise determine acoustic detectability on coral reefs

2013

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Acoustic telemetry is an increasingly common tool for studying the movement patterns, behaviour, and site fidelity of marine organisms, but to accurately interpret acoustic data, the variability, periodicity and range of detectability between acoustic tags and receivers must be understood. The relative and interactive effects of topography with biological and environmental noise have not been quantified on coral reefs. We conduct two long-term range tests (one and four months duration) on two different reef types in the central Red Sea, to determine the relative effect of distance, depth, topography, time of day, wind, lunar phase, sea surface temperature and thermocline on detection probability. Detectability, as expected, declines with increasing distance between tags and receivers, and we find average detection ranges of 530 and 120 m, using V16 and V13 tags respectively, but the topography of the reef can significantly modify this relationship, reducing the range by ~70%, even when tags and receivers are in line-of-sight. Analyses that assume a relationship between distance and detections must therefore be used with care. Nighttime detection range was consistently reduced in both locations and detections varied by lunar phase in the four month test, suggesting a strong influence of biological noise (reducing detection probability up to 30%), notably more influential than other environmental noises, including wind-driven noise, which is normally considered important in open-water environments. Analysis of detections should be corrected in consideration of the diel patterns we find, and range tests or sentinel tags should be used for more than one month to quantify potential changes due to lunar phase. Some studies assume that the most usual factor limiting detection range is weather-related noise; this cannot be extrapolated to coral reefs.

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Section: Discussionmentioning

confidence: 99%

Topography and biological noise determine acoustic detectability on coral reefs

2013

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“…R. taylori and R. terraenovae also used a variety of habitats in nearshore embayments [18,19]. Although C. sorrah displayed high residency and site fidelity to single nearshore habitats, individuals also demonstrated a high degree of spatial segregation and individual variability in habitat use [22,29]. Unlike C. fitzroyensis, C. sorrah demonstrated no habitat preference at the population level.…”

Section: Discussionmentioning

confidence: 99%

“…As the life history characteristics of these species are sometimes an intermediate of those exhibited by large-and small-bodied species [20,21], medium-bodied coastal species may exhibit unique movement and space use patterns. For example, the mediumbodied spottail shark Carcharhinus sorrah exhibits high site fidelity to single nearshore embayments with individuals using small home ranges and consistent habitats [22], similar to large-bodied juvenile populations. However, at a population level, C. sorrah use a wide range of coastal habitats and juvenile and adult spottails are known to occupy the same coastal areas simultaneously [22,23].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the mediumbodied spottail shark Carcharhinus sorrah exhibits high site fidelity to single nearshore embayments with individuals using small home ranges and consistent habitats [22], similar to large-bodied juvenile populations. However, at a population level, C. sorrah use a wide range of coastal habitats and juvenile and adult spottails are known to occupy the same coastal areas simultaneously [22,23].…”

Section: Introductionmentioning

confidence: 99%

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Nearshore movement ecology of a medium-bodied shark, the creek whaler Carcharhinus fitzroyensis

et al. 2015

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Background: The movement and habitat use patterns of medium-bodied nearshore sharks are poorly understood. However, these species face some of the highest levels of exposure to anthropogenic development. The habitat and space use strategies species exhibit affect their role within communities and how they respond to environmental change. The present study used passive acoustic telemetry to evaluate the residency, space use, and habitat use patterns of the creek whaler Carcharhinus fitzroyensis in a nearshore embayment in Queensland, Australia. Results: Individuals were monitored for approximately 18 months. Half of the monitored population were highly resident to the bay. In contrast, several individuals spent less than 2 weeks in the bay, suggesting that broader movements may occur in a portion of the population. Size had no effect on residency. Activity space size varied between months and time of day but was also not affected by animal size. All C. fitzroyensis spent the majority of time in seagrass habitat (70%) and deep water (>5 m) mud substrate (20%). Shallow mudflat, sandy inshore, and reef habitats were rarely used (7%). Although the sample size of immature individuals was relatively small, results indicated immature and mature C. fitzroyensis shared space and habitats.

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“…Acoustic telemetry studies have been used increasingly to address ecological questions concerning habitat use (e.g. Wearmouth & Sims 2009, Hammerschlag-Peyer & Layman 2010, Knip et al 2012, as well as residency of animals at specific habitats (e.g. Douglas et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Habitat associations and dispersal of black sea bass from a mid-Atlantic Bight reef

Fabrizio¹,

Manderson²,

Pessutti³

2013

Mar. Ecol. Prog. Ser.

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We examined habitat associations of 122 adult black sea bass Centropristis striata at a temperate reef off the coast of New Jersey, USA. The study site, located within the Historic Area Remediation Site, encompassed 46.1 km 2 and included areas of rocky bottom and highly variable bathymetry. Factors influencing dispersal and habitat use were determined from acoustic telemetry data collected between May and December 2003 from a grid of 72 moored receivers. About 2.7 times as many black sea bass used the site in summer as in fall. Fish were associated with relatively shallow, complex habitats characterized by previously placed, coarse-grain material that may have provided food, shelter, or both. Deep areas (> 27.5 m) with coarse-grain material were rarely used. Dispersal of black sea bass was not a pulse event, but rather a steady movement of individuals away from the site as inshore bottom water temperatures declined between late September and mid-December. Both temperature and photoperiod may serve as cues to the initiation of offshore movements of fish to wintering grounds near the edge of the shelf. Some black sea bass resided at the reef for periods of up to 6 mo encompassing the spawning period; as such, these habitats may be important to the continued production of the stock. In the mid-Atlantic Bight, surveys to estimate the relative abundance of this species during their inshore residency period should be conducted in July-August in structurally complex habitats and in waters < 28 m deep.

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Habitat use and spatial segregation of adult spottail sharks Carcharhinus sorrah in tropical nearshore waters

Cited by 53 publications

References 35 publications

Topography and biological noise determine acoustic detectability on coral reefs

Topography and biological noise determine acoustic detectability on coral reefs

Nearshore movement ecology of a medium-bodied shark, the creek whaler Carcharhinus fitzroyensis

Habitat associations and dispersal of black sea bass from a mid-Atlantic Bight reef

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