Insights into movement behaviour of snapper (Chrysophrys auratus, Sparidae) from a large acoustic array

2017 ◽  
Vol 68 (8) ◽  
pp. 1438 ◽  
Author(s):  
A. J. Fowler ◽  
C. Huveneers ◽  
M. T. Lloyd
Keyword(s):  
Acoustic Telemetry ◽  
South Australia ◽  
Movement Behaviour ◽  
Marine Park ◽  
Spatial Management ◽  
Different Types ◽  
Systematic Behaviour ◽  
Acoustic Array ◽  
Region Scale ◽  
Fishery Species

Snapper is a significant fishery species in Australasia whose movement behaviour remains poorly understood. This was addressed in the present study at the within-region scale using acoustic telemetry in the Gulf St Vincent, South Australia. Over 3 years from May 2011, 54 snapper were monitored throughout ~160km2 using 41 acoustic receivers. The dispersion of >500000 detections varied in space and time, reflecting three types of space use, dependent on different types of movement behaviour. One station, near a large shipwreck, accounted for 67.8% of all detections, particularly during winter, when fish were sedentary and site attached. In spring, the fish dispersed throughout the study area to different habitats and, through summer, occupied different larger restricted areas than used in winter. Snapper were highly mobile and demonstrated systematic behaviour at several temporal scales. They moved linear distances of up to ~100km and could achieve tens of kilometres in a day in episodic movements. Through the year, their activity was distributed across areas of hundreds of square kilometres. The regional spatial management regimen was assessed against this enhanced understanding of movement behaviour. A new marine park sanctuary zone that encompassed the shipwreck was appropriately located, but possible benefits of a nearby spatial spawning closure area appear limited.

A fisheries perspective of behavioural variability: differences in movement behaviour and extraction rate of an exploited sparid, snapper (Pagrus auratus)

2011 ◽  
Vol 68 (4) ◽  
pp. 632-642 ◽  
Author(s):  
Darren M. Parsons ◽  
Mark A. Morrison ◽  
Jeremy R. McKenzie ◽  
Bruce W. Hartill ◽  
Richard Bian ◽  
...  
Keyword(s):  
Population Size ◽  
Fisheries Management ◽  
Fishing Effort ◽  
Extraction Rate ◽  
Movement Behaviour ◽  
Pagrus Auratus ◽  
The Status ◽  
Likelihood Model ◽  
Lower Population ◽  
Fishery Species

Intraspecific variation in movement patterns are well established for many species, but poorly appreciated in fisheries management. In this study we dart-tagged snapper ( Pagrus auratus ), an important fishery species, across different areas and habitats in the Hauraki Gulf, New Zealand. Tag returns were used to quantify movement behaviour and extraction rates using a maximum likelihood model that corrected for spatial variability in population size and fishing effort. Residency was high (~90%) in two strata and lower (75%) in the remaining stratum. The stratum with the highest residency also appeared to experience the highest extraction rate (likely due to a lower population size). These results confirm the existence of differences in movement behaviour within the snapper population, suggesting that localized areas may become depleted regardless of the status of the overall stock. This has consequences for the scale of fisheries management and the size of marine reserves implemented in different regions. Understanding why variation in movement behaviour exists (i.e., genetic vs. environmental) is the next step in addressing the influence of animal behaviour on fisheries management.

scholarly journals Where technology meets ecology: acoustic telemetry in contemporary Australian aquatic research and management

2017 ◽  
Vol 68 (8) ◽  
pp. 1397 ◽  
Author(s):  
Matthew D. Taylor ◽  
Russ C. Babcock ◽  
Colin A. Simpfendorfer ◽  
David A. Crook
Keyword(s):  
Marine Protected Areas ◽  
Acoustic Telemetry ◽  
Individual Variability ◽  
Decision Makers ◽  
Aquatic Environments ◽  
The Past ◽  
Safety Design ◽  
Substantial Investment ◽  
Acoustic Array ◽  
Insight Into

Acoustic telemetry is used to investigate a diverse suite of questions regarding the biology and ecology of a range of aquatic species, and is an important tool for fisheries and conversation management. Herein we present a brief review of the Australian acoustic telemetry literature in the context of key areas of progress, drawing from several recent studies and identifying areas for future progress. Acoustic telemetry has been increasingly used in Australia over the past decade. This has included substantial investment in a national acoustic array and the associated development of a national acoustic telemetry database that enables tag deployment and detection data to be shared among researchers (the Integrated Marine Observing System Animal Tracking Facility). Acoustic telemetry has contributed to important areas of management, including public safety, design and management of marine protected areas, the use of closures in fisheries management, informing environmental flow regimes and the impacts of fisheries enhancements, and is most powerful when used as a complementary tool. However, individual variability in movement often confounds our ability to draw general conclusions when attempting to characterise broad-scale patterns, and more work is required to address this issue. This overview provides insight into the important role that acoustic telemetry plays in the research and management of Australian aquatic ecosystems. Application of the technology transcends aquatic environments and bureaucracies, and the patterns revealed are relevant to many of the contemporary challenges facing decision makers with oversight of aquatic populations or ecosystems.

scholarly journals The “mapping out” approach: effectiveness of marine spatial management options in European coastal waters

2013 ◽  
Vol 71 (9) ◽  
pp. 2630-2642 ◽  
Author(s):  
Katrine Soma ◽  
Jorge Ramos ◽  
Øivind Bergh ◽  
Torsten Schulze ◽  
Hans van Oostenbrugge ◽  
...  
Keyword(s):  
Evaluation Framework ◽  
European Countries ◽  
Management Options ◽  
Marine Management ◽  
Stakeholder Interests ◽  
Management Measures ◽  
Long Run ◽  
Spatial Management ◽  
Different Types ◽  
Types Of Information

Abstract Marine spatial management is challenged by complex situations in European countries where multiple stakeholder interests and many management options have to be balanced. EU policy initiatives such as the proposed Marine Spatial Planning Directive, are in different ways targeting area allocation in European waters. In this circumstance, EU marine management needs assessments based on a satisfactory evaluation framework design that can ensure a transparent treatment of different types of information including interests, values, and facts. The main goal of this article is to introduce an evaluation framework applicable to marine management in European countries. This so-called CoExist framework maps out different types of relevant knowledge to assess future possibilities for use or no-use of marine areas and links this with appropriate management measures. The CoExist framework is based on the principles of ensuring transparent treatment of different types of information as well as appropriate stakeholder representation which can ensure legitimacy. Empirical findings in six European case studies have been obtained while conducting the CoExist framework. Applying the basic principles of the CoExist framework when planning future management directions of the coexistence of multiple activities in the long-run will expectedly affect the ecological and social-cultural goals by counterbalancing the economic ones.

scholarly journals Comparing the impacts of different types of recreational trails on grey box grassy-woodland vegetation: lessons for conservation and management

2016 ◽  
Vol 64 (3) ◽  
pp. 246 ◽  
Author(s):  
Mark Ballantyne ◽  
Donna Louise Treby ◽  
Joseph Quarmby ◽  
Catherine Marina Pickering
Keyword(s):  
South Australia ◽  
Average Width ◽  
Safety Issues ◽  
Exotic Grasses ◽  
Different Types ◽  
High Conservation ◽  
Vegetation Parameters ◽  
Mixed Approach ◽  
Vegetation Loss ◽  
Recreational Trails

Tourism and recreation are popular in natural areas but can damage plant communities, including those of high conservation value in protected areas. This includes impacts from recreational trails, but what type of trail has the most impact and why? We compared the impacts of five different trails (narrow, intermediate and wide bare earth trails, intermediate gravel trails and wide tarmac trails) on the endangered grey box grassy-woodland (Eucalyptus microcarpa (Maiden) Maiden) in Belair National Park near Adelaide in South Australia. First, the extent, width and area of recreational trails in the remnant woodland were mapped. Then, vegetation parameters were recorded in quadrats at three distances from the edge of trails in the woodland, with 10 replicate sites per trail type and single quadrats at 10 control sites (i.e. total 60 sites, 160 quadrats). All trails resulted in vegetation loss on the trail surface and along the edges of the trails, as well as changes in vegetation composition, including reductions in shrubs and bulbs close to the trail. The most common types of trail were bare earth trails with an average width of 2.5 m (50% of trails) which resulted in the greatest soil loss (>88 000 m3) and vegetation loss (33 899 m2 or 3.4 ha) in the 167 ha woodland remnant overall. Wider (5.4 m) hardened tarmac trails, however, were associated with low species richness, high cover of exotic grasses and few herbs, shrubs and bulbs compared with vegetation away from trails and closer to other trails. Therefore a mixed approach to the provision of trails may be most appropriate, with hardened trails used in areas of highest use, but in some circumstances leaving trails unhardened may be more appropriate where they are likely to remain narrow and where there is less likely to be erosion and/or safety issues.

Eels at the Edge: Science, Status, and Conservation Concerns

2009 ◽  
Keyword(s):  
Acoustic Telemetry ◽  
Three Dimensional ◽  
Searching Behavior ◽  
Fine Scale ◽  
Connecticut River ◽  
Vertical Movements ◽  
Resource Managers ◽  
Silver Eels ◽  
Acoustic Array ◽  
The Impact

<em>Abstract.—</em>Declines in the population of the American eel, <em>Anguilla rostrata</em>, along the northwestern Atlantic have stimulated resource managers to consider the impact of hydroelectric facilities on silver-phase eels as they migrate downstream to the sea. During the fall of 2002, we investigated the movement of migrant eels passing downstream of a small hydroelectric facility on the Connecticut River (Massachusetts). We used three-dimensional acoustic telemetry to monitor fine-scale movement of telemetered silver eels in the forebay (the first 100 m of area directly upstream of the dam). Eel movements were tracked approximately every three seconds, and individual swimming pathways were reconstructed to compare the three-dimensional results with biotelemetry methods previously used at this site; conventional telemetry systems included radio, PIT, and acoustic telemetry. We found that three-dimensional acoustic telemetry provided the necessary fine-scale resolution to characterize dominant movement patterns and locations of passage. Eels were detected at all depths throughout the forebay; however, they spent the greatest proportion of their time near the bottom, with occasional vertical movements to the surface. Eels exhibited a range of movements interpreted to be downstream searching behavior, including altered vertical and horizontal positions at or near the trash racks and various looping movements directly upstream of the trash racks and throughout the entire forebay. A substantial number of these eels (28%) were detected re-entering the acoustic array on multiple dates before passing the station. The majority (89%) were detected passing downstream of the dam through the turbines.

scholarly journals Accounting for detection gaps when evaluating reef fish habitat use in an acoustic array

2018 ◽  
Vol 75 (3) ◽  
pp. 375-388 ◽  
Author(s):  
Nicholas A. Farmer ◽  
Jerald S. Ault
Keyword(s):  
Reef Fish ◽  
Survey Design ◽  
Fish Habitat ◽  
Probability Of Detection ◽  
Spatial Management ◽  
Detection Probabilities ◽  
Utilization Patterns ◽  
Acoustic Array ◽  
Passive Acoustic ◽  
The Relationship

Understanding the relationship between habitats and the distribution of fishes is critical to effective survey design and spatial management. Determining reef fish habitat utilization patterns from passive acoustic arrays is challenging for the following reasons: (i) habitat classifications must be meaningful to the species, (ii) the array must contain the species’ home range, and (iii) the probability of detection may differ among habitats within the array. We conducted a multi-year tracking study in the marine protected areas (MPAs) of Dry Tortugas, Florida, using a calibrated passive acoustic array deployed over habitats classified by type (reef, rubble, sand), rugosity (high, medium, low relief), and patchiness (contiguous, spur-and-groove, isolated). Our design controlled for differences between individuals, diel and edge effects, and detection gaps resulting from the nonlinear relationship between acoustic tag detection probabilities as a function of distance from the receiver. We found red and black groupers preferred high-relief reef habitats, whereas mutton and yellowtail snappers preferred low-relief contiguous reef habitats. By identifying critical habitats for exploited species, our analysis may facilitate more efficient fishery-independent sampling and MPA designs.

Integrating Seafloor Habitat Mapping and Fish Assemblage Patterns Improves Spatial Management Planning in a Marine Park

2016 ◽  
Vol 75 (sp1) ◽  
pp. 1292-1296 ◽  
Author(s):  
Hamish A. Malcolm ◽  
Alan Jordan ◽  
Arthur L. Schultz ◽  
Stephen D.A. Smith ◽  
Tim Ingleton ◽  
...  
Keyword(s):  
Fish Assemblage ◽  
Habitat Mapping ◽  
Management Planning ◽  
Marine Park ◽  
Spatial Management

scholarly journals Effectiveness of five personal shark-bite deterrents for surfers

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5554 ◽  
Author(s):  
Charlie Huveneers ◽  
Sasha Whitmarsh ◽  
Madeline Thiele ◽  
Lauren Meyer ◽  
Andrew Fox ◽  
...  
Keyword(s):  
Effect Size ◽  
South Australia ◽  
Control Board ◽  
The Public ◽  
Human Interactions ◽  
Marine Park ◽  
The People ◽  
Sense Of Security ◽  
Electrical Pulses ◽  
Number Of Passes

The number of shark-human interactions and shark bites per capita has been increasing since the 1980s, leading to a rise in measures developed to mitigate the risk of shark bites. Yet many of the products commercially available for personal protection have not been scientifically tested, potentially providing an exaggerated sense of security to the people using them. We tested five personal shark deterrents developed for surfers (Shark Shield Pty Ltd[Ocean Guardian]Freedom+ Surf, Rpela, SharkBanz bracelet, SharkBanz surf leash,andChillax Wax) by comparing the percentage of baits taken, distance to the bait, number of passes, and whether a shark reaction could be observed. We did a total of 297 successful trials at the Neptune Islands Group Marine Park in South Australia, during which 44 different white sharks (Carcharodon carcharias) interacted with the bait, making a total of 1413 passes. The effectiveness of the deterrents was variable, with theFreedom+ Surfaffecting shark behaviour the most and reducing the percentage of bait taken from 96% (relative to the control board) to 40%. The mean distance of sharks to the board increased from 1.6 ± 0.1 m (control board) to 2.6 ± 0.1 m when theFreedom Surf+was active. The other deterrents had limited or no measureable effect on white shark behavour. Based on our power analyses, the smallest effect size that could be reliably detected was ∼15%, which for the first time provides information about the effect size that a deterrent study like ours can reliably detect. Our study shows that deterrents based on similar principles—overwhelming a shark’s electroreceptors (the ampullae of Lorenzini) with electrical pulses—differ in their efficacy, reinforcing the need to test each product independently. Our results will allow private and government agencies and the public to make informed decisions about the use and suitability of these five products.

Friendship Quality: Role in the Relationship Between Peer Victimisation and Psychopathology

2011 ◽  
Vol 28 (1) ◽  
pp. 15-32
Author(s):  
Alicia M. Piteo ◽  
Lisa J. Kettler
Keyword(s):  
Relational Aggression ◽  
Peer Relations ◽  
South Australia ◽  
Friendship Quality ◽  
Cross Sectional Study ◽  
Primary School Children ◽  
Future Research ◽  
Cross Sectional ◽  
Different Types ◽  
The Relationship

This cross-sectional study explored the moderating influence of friendship quality and gender in the relationship between psychopathology and different types of victimisation experienced by primary school children. Five hundred and sixty-six children (n= 264 males;n= 302 females) with a mean age of 11.61 years (SD= 1.10) in Adelaide, South Australia completed the Peer Relations Questionnaire, the Relational Aggression Scale, the Strengths and Difficulties Questionnaire and the Friendship Quality Questionnaire. Neither overall friendship quality nor gender moderated the relationship between either direct or relational victimisation and psychopathology. However, ‘conflict and betrayal’ moderated the relationship between relational victimisation and psychopathology. For high levels of conflict and betrayal the relationship between relational victimisation and psychopathology was stronger for boys than girls. Possibly, a particular aspect of friendship quality may be more protective in the relationship between different types of victimisation and psychopathology. Implications of these results and suggestions for future research are considered.

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