Short-Range Movements of Hawksbill Turtles (<i>Eretmochelys imbricata</i>) from Nesting to Foraging Areas within the Hawaiian Islands

Parker, Denise M.; Balazs, George H.; King, Cheryl S.; Katahira, Larry; Gilmartin, William G.

doi:10.2984/049.063.0306

Cited by 29 publications

(24 citation statements)

References 15 publications

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“…While hawksbill nonmigra tory behavior has previously been documented for individuals inhabiting archipelagos (e.g. Mortimer & Balazs 1999, Parker et al 2009), our research provides the first clear evidence that adult female hawksbills occupying mainland coasts can also be non-migratory. While there are biological benefits to remaining in close proximity to nesting beaches after completing the nesting cycle, e.g.…”

Section: Discussionsupporting

confidence: 53%

See 1 more Smart Citation

Spatial ecology of critically endangered hawksbill turtles Eretmochelys imbricata: implications for management and conservation

Gaos¹,

Lewison²,

Wallace³

et al. 2012

Mar. Ecol. Prog. Ser.

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Elucidating spatio-temporal movements of animals is an integral component of wildlife conservation and protected species management. Between 2008 and 2010 we satellite tracked 15 adult female hawksbill turtles Eretmochelys imbricata in the eastern Pacific Ocean to evaluate their movement behavior and to guide management and conservation efforts of this highly endangered population. Movements and habitat use were highly neritic, and post-nesting mi gration distances (maximum = 283.11 km) were short relative to migrations of other sea turtle species. In foraging areas, the majority of hawksbills established restricted, inshore home ranges within mangrove estuaries. A large proportion (> 65%) of turtle location points fell within protected areas, although many of these sites lack enforcement and monitoring. The consistent use of estuarine and mangrove habitat for nesting and foraging may explain why hawksbills went virtually undetected in the eastern Pacific for decades. The spatially restricted and neritic life cycles of adult hawksbills in the eastern Pacific highlight threats (e.g. overlap with coastal fisheries, increased susceptibility to habitat degradation and/or catastrophic events) and opportunities for conservation (e.g. acute conservation target areas, less variant jurisdictional boundaries/regulations) for this species. Our results underscore the importance of strengthening protected area management, mangrove estuary protection and hawksbill research and conservation in the eastern Pacific.

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Section: Discussionsupporting

confidence: 53%

“…comm.). Further research into hawksbill diet is of particular interest both from biological and conservation perspectives, particularly given the small average size of the adult female hawksbills in the present study (Horrocks et al 2001, Troëng et al 2005, Cuevas et al 2008, Parker et al 2009). …”

Section: Discussionmentioning

confidence: 92%

Spatial ecology of critically endangered hawksbill turtles Eretmochelys imbricata: implications for management and conservation

Gaos¹,

Lewison²,

Wallace³

et al. 2012

Mar. Ecol. Prog. Ser.

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show abstract

“…The few studies estimating home ranges for juvenile hawksbills have generally found areas of 1 km 2 or less (0.07 to 0.14 km ), while 2 larger individuals had home ranges of 2.6 km 2 (48.5cm CCL) and 4.04 km 2 (50.8 cm CCL). Our core-use area estimate was substantially larger than most previously reported (~1 km 2 or less) home-range sizes for immature hawksbills and the 0.5 to 2.0 km 2 adult home-range estimate from Hawaii (Parker et al 2009 body size of sub-adults compared to juveniles, as the results of Scales et al (2011) suggest. As well, homerange size at DRTO may be larger than that for hawksbills at other sites simply due to DRTO-specific habitat configurations.…”

Section: Discussioncontrasting

confidence: 81%

“…Compared to home-range estimates for hawksbills tagged elsewhere and in different size-classes, our results show that the 3 turtles tagged at DRTO had core-use areas ranging from 9.2 to 21.5 km 2 . Previously reported home-range estimates for wild adult hawksbills were 2.0 to 49.5 km 2 in Barbados (Horrocks et al 2001) and 0.5 to 2.0 km 2 in Hawaii (Parker et al 2009); both of these estimates were determined using a minimum convex polygon (MCP) approach. The few studies estimating home ranges for juvenile hawksbills have generally found areas of 1 km 2 or less (0.07 to 0.14 km ), while 2 larger individuals had home ranges of 2.6 km 2 (48.5cm CCL) and 4.04 km 2 (50.8 cm CCL).…”

Section: Discussionmentioning

confidence: 99%

Home range, habitat use, and migrations of hawksbill turtles tracked from Dry Tortugas National Park, Florida, USA

Hart¹,

Sartain²,

Fujisaki³

et al. 2012

Mar. Ecol. Prog. Ser.

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To determine habitat-use patterns of sub-adult hawksbills Eretmochelys imbricata, we conducted satellite-and acoustic-tracking of 3 turtles captured in August 2008 within Dry Tortugas National Park (DRTO), south Florida, USA, in the Gulf of Mexico; turtles ranged in size from 51.9 to 69.8 cm straight carapace length. After 263, 699, and 655 d of residence in the park, turtles migrated out of the DRTO. Within the park, core-use areas (i.e. 50% kernel density estimates) were 9.2 to 21.5 km 2

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“…Published hawksbill migrations show that 11 of 13 females nesting in Maui and Hawaii islands return to nearby foraging grounds (Graham ; Parker et al. , ). For the two other tracked hawksbills, one stopped transmitting west of Kauai (Parker et al.…”

Section: Discussionmentioning

confidence: 99%

The developmental biogeography of hawksbill sea turtles in the North Pacific

Houtan

Francke

Alessi

et al. 2016

Ecology and Evolution

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High seas oceanic ecosystems are considered important habitat for juvenile sea turtles, yet much remains cryptic about this important life‐history period. Recent progress on climate and fishery impacts in these so‐called lost years is promising, but the developmental biogeography of hawksbill sea turtles (Eretmochelys imbricata) has not been widely described in the Pacific Ocean. This knowledge gap limits the effectiveness of conservation management for this globally endangered species. We address this with 30 years of stranding observations, 20 years of bycatch records, and recent simulations of natal dispersal trajectories in the Hawaiian Archipelago. We synthesize the analyses of these data in the context of direct empirical observations, anecdotal sightings, and historical commercial harvests from the insular Pacific. We find hawksbills 0–4 years of age, measuring 8–34 cm straight carapace length, are found predominantly in the coastal pelagic waters of Hawaii. Unlike other species, we find no direct evidence of a prolonged presence in oceanic habitats, yet satellite tracks of passive drifters (simulating natal dispersal) and our small sample sizes suggest that an oceanic phase for hawksbills cannot be dismissed. Importantly, despite over 600 million hooks deployed and nearly 6000 turtle interactions, longline fisheries have never recorded a single hawksbill take. We address whether the patterns we observe are due to population size and gear selectivity. Although most sea turtle species demonstrate clear patterns of oceanic development, hawksbills in the North Pacific may by contrast occupy a variety of ecosystems including coastal pelagic waters and shallow reefs in remote atolls. This focuses attention on hazards in these ecosystems – entanglement and ingestion of marine debris – and perhaps away from longline bycatch and decadal climate regimes that affect sea turtle development in oceanic regions.

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Short-Range Movements of Hawksbill Turtles (Eretmochelys imbricata) from Nesting to Foraging Areas within the Hawaiian Islands

Cited by 29 publications

References 15 publications

Spatial ecology of critically endangered hawksbill turtles Eretmochelys imbricata: implications for management and conservation

Spatial ecology of critically endangered hawksbill turtles Eretmochelys imbricata: implications for management and conservation

Home range, habitat use, and migrations of hawksbill turtles tracked from Dry Tortugas National Park, Florida, USA

The developmental biogeography of hawksbill sea turtles in the North Pacific

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