Dugong movements Current knowledge and tracking tools
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1 Christophe Matthieu Juncker Cleguer Christophe Cleguer Dugong movements Current knowledge and tracking tools Christophe Cleguer & Helene Marsh
2 Dugong tracking What do we know about dugong movements? How can telemetry studies help dugong management? Which tool for which question?
3 Dugong movements are individualistic and heterogeneous 335 km 560 km Australia 513 km Sheppard et al. (2006)
4 Dugong movements are individualistic and heterogeneous New Caledonia 0 6km 0 20km Collecting data on the movements of a few dugongs will not reflect what an entire population is doing Example of small scale movement Example of large scale movement
5 Dugongs use different pathways to travel Example of coastal movements Zeh et al. (2016) Dugong track Shark nets
6 In some regions dugongs use unexpected paths Three dugongs tracked in New Caledonia used the fore reef shelf outside the lagoon to travel from one bay to another. Position of tracked dugong 1 Position of tracked dugong 2 Position of tracked dugong 3 Cleguer (2015)
7 Why do dugongs move? Matthieu Juncker Feeding what-when-how.com Mating Google image Sheltering from rough seas Google image Thermoregulating
8 Dugongs have considerable capacity for orientation. But what sensory cues do they use? Auditory cues? Vision? Tactile sensors? A combination of cues?
9 Dugong tracking What do we know about dugong movements? How can telemetry studies help dugong management? Which tool for which question?
10 Identifying areas where there is a risk of entanglement in nets In movement corridors In areas of high use Land Use by tracked dugongs High Cleguer (Unpublished) Zeh et al. (2016) Low Net fishing
11 Identifying mismatches between MPAs and core areas of dugong use Cleguer (2015) Zeh (Unpublished data)
12 There is a risk risk to the dugong population and your reputation of dugong death during capture or tracking Not appropriate if population size is small Dugongs are difficult to safely capture in areas other than shallow clear waters Tracking dugongs require high expertise (catching tagging veterinary advice)
13 Dugong tracking What do we know about dugong movements? How can telemetry studies help dugong management? Which tool for which question?
14 Tools currently used to track dugongs GPS-satellite tags Horizontal data Acoustic tags Horizontal and vertical data Time depth recorders Vertical data
15 Tools currently used to track dugongs GPS-satellite tag Float TDR Tether Acoustic receiver Acoustic transmitter Drawing Dan Zeh Weight
16 Tools currently used to track dugongs Data archived and remotely transmitted GPS-satellite tag Float TDR Tether Archived data Acoustic receiver Acoustic transmitter Data archived and remotely transmitted Drawing Dan Zeh Weight
17 GPS-satellite versus acoustic tracking: the Moreton Bay case study Dan Zeh et al. (2015)
18 GPS-satellite and acoustic tracking can provide very similar information for some animals Home range comparisons juvenile female Zeh et al. (2015)
19 but not all animals Home range comparisons subadult male Zeh et al. (2015)
20 Some animals moved far beyond the acoustic array Data on dugong movement outside of the acoustic array could only be picked up by GPS-satellite tags Zeh et al. (2016)
21 So which technique is more appropriate? It depends on your research question! Acoustic Satellite Spatial scale Local Variable Duration of tracking Years Months Transmitter costs Cheap Expensive Costs associated with deployment and data Upload Depend on circumstances
22 Conclusions Tracking dugongs can help to better understand their spatial ecology and support conservation and management actions. But under some circumstances capturing and tracking dugongs can be dangerous. Which tool to use really depends on your research questions. Matthieu Juncker
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