Inter-island movements of scalloped hammerhead sharks (Sphyrna lewini) and seasonal connectivity in a marine protected area of the eastern tropical Pacific

Ketchum, James T.; Hearn, Alex; Klimley, A. Peter; Peñaherrera, César; Espinoza, Eduardo; Bessudo, Sandra; Soler, Germán; Arauz, Rándall

doi:10.1007/s00227-014-2393-y

Cited by 78 publications

(79 citation statements)

References 28 publications

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“…There was strong evidence of inter-annual residency of sharks within SFB, and individuals repeatedly returned to the same regions of the bay. Inter-annual residency has been shown for the scalloped hammerhead sharks at seamounts [11] and islands [12], and individuals have been demonstrated to stay in confined areas at a seamount [13] and island [14]. White sharks, identified based on unique notches in their fins or coded ultrasonic beacons, have been observed to return from September to December to Southeastern Farallon Island over multiple years [15][16][17], and to feed at particular sites around the island 15.…”

Section: Discussionmentioning

confidence: 99%

Residency and long-distance movements of sevengill sharks (Notorhynchus cepedianus) tagged in San Francisco Bay

et al. 2017

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Background: Sevengill sharks are common inhabitants of estuaries and coastal areas and particularly abundant in San Francisco Bay (SFB). There is limited knowledge about the level of residency and migratory movements of this species. We describe the degree of residence of sevengill sharks in SFB and nearby locations, using ultrasonic tags and automated listening stations.Results: Sevengills showed a high degree of residency in SFB, particularly to the Golden Gate (GG) area where they have a strong site preference, both seasonally and inter-annually. Site fidelity was also the highest at the GG. In sharks with deployment times longer than 300 days, we found that > 80% of visits of all mature males were at GG, 80% of visits of a single mature female occurred there, > 85% of visits of most juvenile males, and > 70% of visits of most juvenile females. At GG, sharks moved into the range of the receiver day and night without a strong preference for a particular time of the day, which implies movements up and down the area day and night. At most other locations within the bay, sharks were present during daytime hours, while at Point Reyes during nighttime hours. Sharks moved into SFB during early spring and summer, and moved out of SFB to Point Reyes during late spring and fall. Three sevengill sharks migrated roughly 800 km southeastward along the coastline from SFO, one making three trips back and forth between the sites. Conclusions:There was strong evidence of residency of sharks within SFB, and sharks repeatedly returned to the same region of the bay with some sharks making long-distance movements.

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Section: Discussionmentioning

confidence: 99%

Residency and long-distance movements of sevengill sharks (Notorhynchus cepedianus) tagged in San Francisco Bay

et al. 2017

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“…Predators can directly influence nutrient cycling by consuming prey in one habitat, and excreting or egesting in others (Schmitz et al 2010). Nutrient transfer has been demonstrated for planktivorous and herbivorous fishes but far less is known for large, reef-associated carnivores, despite the longer range movements performed by these animals potentially linking distant habitats (Geesey et al 1984, Meyer & Schultz 1985, Matich et al 2011, McCauley et al 2012, Ketchum et al 2014. For example, diver observations and stable isotopes suggest that grey reef sharks at a Pacific atoll may be refuging and foraging in different habitats (McCauley et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…A growing number of studies are considering the potential role marine predators may have in linking ecological habitats (e.g. Matich et al 2011, McCauley et al 2012, Ketchum et al 2014, and the combination of telemetry and stable isotope analysis will allow greater refinement in predicting the direction and magnitude of nutrient transport between habitats. …”

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confidence: 99%

Movements and foraging of predators associated with mesophotic coral reefs and their potential for linking ecological habitats

Papastamatiou¹,

Meyer²,

Kosaki³

et al. 2015

Mar. Ecol. Prog. Ser.

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Marine predators will often perform diel and seasonal movements associated with specific habitats. In tropical areas, mesophotic coral reefs may be an important habitat type for many predators, but their use of these areas has rarely been investigated. We used results of acoustic telemetry and stable isotope analyses to investigate the diel and seasonal movements of Galapagos sharks Carcharhinus galapagensis and giant trevally Caranx ignobilis captured from a mesophotic reef (depth: 50 to 70 m) at an uninhabited Pacific atoll. All predators associated with mesophotic reefs performed horizontal and vertical movements over seasonal and diel time frames. Galapagos sharks performed reverse diel vertical movements, diving deeper during the night than during the day, while giant trevally displayed a mix, with some individuals performing regular diel movements (deep during the day, shallow at night) and others performing reverse vertical diel movements. Trevally used very shallow water during the summer spawning periods. The isotopic compositions of predators suggest they primarily forage in shallow reefs, although approximately 35% of resources came from mesophotic reefs. Similar to their variability in vertical movement strategies, giant trevally occupied a wide range of trophic positions, potentially due to individual specialization in diet and high levels of intra-specific competition. Mesophotic reefs may provide some prey to upper level predators but also serve as a refuge habitat. The frequent movements between habitats suggest that marine predators may function as significant transporters of nutrients, particularly from shallow to mesophotic reefs.

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“…Many studies have demonstrated success in tracking a variety of marine taxa with pop-up satellite archival transmitting (PSAT) tags (e.g., Skomal et al 2009;Werry et al 2014) or acoustic telemetry techniques (e.g., Ketchum et al 2014), often revealing unexpected behaviors (Gore et al 2008;Thorrold et al 2014;Cagua et al 2015). However, only a handful of publications have reported the use of PSAT (Graham et al 2012;Braun et al 2014) or acoustic tags (Dewar et al 2008) to understand manta ecology.…”

Section: Introductionmentioning

confidence: 99%

Movements of the reef manta ray (Manta alfredi) in the Red Sea using satellite and acoustic telemetry

Braun

Skomal²,

Thorrold

et al. 2015

Mar Biol

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within the array. Estimated and realized satellite tag data indicated regional movements <200 km from the tagging location, largely coastal residency, and high surface occupation. GPS-tagged individuals regularly moved within the coastal reef matrix up to ~70 km to the south but continued to return to the tagging area near the high-occupancy sites identified in the acoustic array. We also tested the accuracy of several geolocation models to determine the best approach to analyze our light-based satellite tag data. We documented significant errors in light-based movement estimates that should be considered when interpreting tracks derived from light-level geolocation, especially for animals with restricted movements through a homogenous temperature field. Despite some error in satellite tag positions, combining results from PSAT and acoustic tags in this study yielded a comprehensive representation of manta spatial ecology across several scales, and such approaches will, in the future, inform the design of appropriate management strategies for manta rays in the Red Sea and tropical regions worldwide.

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Inter-island movements of scalloped hammerhead sharks (Sphyrna lewini) and seasonal connectivity in a marine protected area of the eastern tropical Pacific

Cited by 78 publications

References 28 publications

Residency and long-distance movements of sevengill sharks (Notorhynchus cepedianus) tagged in San Francisco Bay

Residency and long-distance movements of sevengill sharks (Notorhynchus cepedianus) tagged in San Francisco Bay

Movements and foraging of predators associated with mesophotic coral reefs and their potential for linking ecological habitats

Movements of the reef manta ray (Manta alfredi) in the Red Sea using satellite and acoustic telemetry

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