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1.
STEVEN D. EMSLIE FELIPE A. ESTELA MARTINA S. MÜLLER GIACOMO DELL’OMO DAVID J. ANDERSON 《Ibis》2012,154(1):61-73
Most tropical booby species complete breeding foraging trips within daylight hours, thus avoiding nights at sea. Nazca Boobies Sula granti are unusual in this respect, frequently spending one or more nights away from the nest. We used GPS dataloggers, time‐depth recorders, and changes in body weight to characterize foraging trips and to evaluate potential influences on the decisions of 64 adult Nazca Boobies to spend a night at sea, or to return to their chicks on Isla Española, Galápagos, in daylight hours. The tagged birds foraged east of Isla Española, undertaking both single‐day (2–15 h, 67% of trips) and overnight trips (28 h–7.2 days, 33%), and executing 1–19 foraging plunge‐dives per single‐day trip. Birds might forage longer if they are in nutritional stress when they depart, but body weight at departure was not correlated with trip length. Birds might be expected to return from longer trips with more prey for young, but they returned from single‐day and overnight trips with similar body weights, consistent with previous indications that Nazca Boobies forage until accumulating a target value of prey weight. Birds with a lower dive frequency during the first 5 h of a trip were more likely to spend the night at sea, suggesting that they might choose to spend the night at sea if prey capture success was low. At night, birds almost never dived and spent most of their time resting on the water’s surface (11.8–12.1 h, > 99% of the time between civil sunset and civil dawn). Thus, the night is an unproductive time spent among subsurface predators under low illumination. The birds’ webbed feet provided evidence of this risk: 24% of birds were missing > 25% of their foot tissue, probably due to attacks by predatory fish, and the amount of foot tissue lost increased with age, consistent with a cumulative risk across the lifespan. In contrast, other tropical boobies (Blue‐footed Sula nebouxii and Brown Boobies Sula leucogaster), which do not spend the night on the water, showed no such damage. These results suggest that chick‐rearing Nazca Boobies accept nocturnal predation risk on occasions of low prey encounter during a foraging trip’s first day. 相似文献
2.
Intercolony variations in movement patterns and foraging behaviors among herring gulls (Larus argentatus) breeding in the eastern Wadden Sea
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Leonie Enners Philipp Schwemmer Anna‐Marie Corman Christian C. Voigt Stefan Garthe 《Ecology and evolution》2018,8(15):7529-7542
Herring gulls (Larus argentatus) are opportunistic predators that prefer to forage in the intertidal zone, but an increasing degree of terrestrial foraging has recently been observed. We therefore aimed to analyze the factors influencing foraging behavior and diet composition in the German Wadden Sea. Gulls from three breeding colonies on islands at different distances from the mainland were equipped with GPS data loggers during the incubation seasons in 2012–2015. Logger data were analyzed for 37 individuals, including 1,115 foraging trips. Herring gulls breeding on the island furthest from the mainland had shorter trips (mean total distance = 12.3 km; mean maximum distance = 4.2 km) and preferred to feed on the tidal flats close to the colony, mainly feeding on common cockles (Cerastoderma edule) and shore crabs (Carcinus maenas). In contrast, herring gulls breeding close to the mainland carried out trips with a mean total distance of 26.7 km (mean maximum distance = 9.2 km). These gulls fed on the neobiotic razor clams (Ensis leei) in the intertidal zone, and a larger proportion of time was spent in distant terrestrial habitats on the mainland, feeding on earthworms. δ13C and δ15N values were higher at the colony furthest from the mainland and confirmed a geographical gradient in foraging strategy. Analyses of logger data, pellets, and stable isotopes revealed that herring gulls preferred to forage in intertidal habitats close to the breeding colony, but shifted to terrestrial habitats on the mainland as the tide rose and during the daytime. Reduced prey availability in the vicinity of the breeding colony might force herring gulls to switch to feed on razor clams in the intertidal zone or to use distant terrestrial habitats. Herring gulls may thus act as an indicator for the state of the intertidal system close to their breeding colony. 相似文献
3.
4.
Scott A. Taylor James A. Morris-Pocock Zhengxin Sun Vicki L. Friesen 《Journal of Ornithology》2010,151(2):525-528
Ten microsatellite loci were isolated and characterized from Blue-footed (Sula nebouxii) and Peruvian Boobies (S. variegata). The loci were screened in 24 Blue-footed Boobies and 27 Peruvian Boobies: 8 were polymorphic in Blue-footed Boobies with
between 2 and 10 alleles per locus and 9 were polymorphic in Peruvian Boobies with between 2 and 12 alleles per locus. Observed
heterozygosity ranged from 0.29 to 0.84. These loci were also tested in Brown Boobies (S. leucogaster) and were variably polymorphic. These new loci are currently being used to assess population genetic structure in Blue-footed
and Peruvian Boobies and will also be used to examine hybridization between the species. 相似文献
5.
Andrea Raya Rey Klemens Pütz Guillermo Luna-Jorquera Benno Lüthi Adrián Schiavini 《Polar Biology》2009,32(4):561-568
The diving behaviour of female southern rockhopper penguins (Eudyptes chrysocome) was studied at Noir Island (54°30′S–73°00′W), Chile, in the southeast Pacific Ocean. This isolated island is located at
the edge of the continental shelf in an area where the Humboldt Current originates, and holds a population of more than 150,000
breeding pairs. On 13 December 2005, four TDRs were successfully attached to females at the end of the brooding period and
recorded diving activity at intervals of 2 s over the next 4 weeks. In total, 40 complete foraging trips were recorded. Trip
duration was on average 42.4 ± 40.1 h and the proportion of overnight trips (60%) was the highest value found so far for this
species. Mean dive depth and dive duration was 20.6 ± 19.4 m and 63.7 ± 36.4 s, respectively. The diving effort was higher
than that of brooding females from the Indian Ocean and comparable with that of conspecifics from colonies in the southwest
Atlantic in terms of diving rate (38 ± 14.2 dives h−1), but slightly lower as regards the proportion of time spent underwater (61 ± 10.5%). This study confirms that the diving
behaviour of rockhopper penguins varies as a function of the physical and biological characteristics of the foraging areas
and of the particular stage of the breeding season. 相似文献
6.
Andrea Raya Rey Charles-André Bost Adrián Schiavini Klemens Pütz 《Journal of Ornithology》2010,151(4):933-943
This study investigates the movements of Magellanic Penguins Spheniscus magellanicus breeding on Isla Martillo during the early chick-rearing period. Foraging paths were reconstructed using GPS loggers that
registered the penguins′ geographic position, water temperature and depth at regular intervals. The relationship between penguins′
movements and search strategies, tide and tidal currents were assessed. Mean trip duration was on average 14.7 ± 6.9 h (33%
overnight), and the maximum distance reached was 24 ± 10 km. All penguins studied foraged to the east of the colony. We identified
three phases based on the sinuosity and speed of the trajectory: transit, central and return. Foraging effort was higher during
the central phase, followed by the transit phase, and lower in the return phase. Foraging success, measured as the percentage
of time at the bottom during each phase, was also highest during the central phase. In all birds studied, the central phase
of the foraging trip took place during ebb tide, and birds travelled to the foraging areas with flow tide running in the same
direction of displacement. Our study suggests that penguins take advantage of tidal currents to facilitate their movements
to and from the main foraging area, thereby reducing the energy expended. Moreover, we suggest that piscivorous diving birds
may enhance their catch rate during ebb tide when fish are more concentrated near the channel bed. 相似文献
7.
Central-place foraging seabirds increase food-loads and decrease meal frequency when they forage in areas that are distant
from the breeding colony. In 2001–2002, we studied the seasonal changes in at-sea distribution, food-load mass, meal frequency,
and fledging mass in rhinoceros auklets (Cerorhinca monocerata), which forage in coastal waters during the day and feed their chicks at night. In both years, greater numbers of auklets
were observed flying in northern waters that are more distant from the colony in June (65 km) and July (65–66 km) than in
May (38–47 km). In July of both years, many auklets flew northward across the transect set 65–120 km north of the colony at
sunrise; the birds returned south again at sunset, indicating that they foraged in waters outside the study area. This seasonal
northward movement of the foraging area may reflect the migration of their main prey item, the Japanese anchovy (Engraulis japonicus), which move with the Tsushima Warm Current flowing from the southern Sea of Japan. Food-load mass did not increase seasonally.
In both years, the estimated daily meal frequency was lower in July than in May or June, partly because of the increased foraging
distance in July. Late-hatched chicks also displayed lighter fledging masses than early chicks in both years. We suggest that
late breeders are required to forage at great distances for longer periods, which may result in decreased meal frequency and
lighter fledging mass of their chicks. 相似文献
8.
Katrin Ludynia Nina Dehnhard Maud Poisbleau Laurent Demongin Juan F. Masello Petra Quillfeldt 《PloS one》2012,7(11)
Logger technology has revolutionised our knowledge of the behaviour and physiology of free-living animals but handling and logger attachments may have negative effects on the behaviour of the animals and their welfare. We studied southern rockhopper penguin (Eudyptes chrysocome) females during the guard stage in three consecutive breeding seasons (2008/09−2010/11) to evaluate the effects of handling and logger attachment on foraging trip duration, dive behaviour and physiological parameters. Smaller dive loggers (TDRs) were used in 2010/11 for comparison to larger GPS data loggers used in all three seasons and we included two categories of control birds: handled controls and PIT control birds that were previously marked with passive integrative transponders (PITs), but which had not been handled during this study. Increased foraging trip duration was only observed in GPS birds during 2010/11, the breeding season in which we also found GPS birds foraging further away from the colony and travelling longer distances. Compared to previous breeding seasons, 2010/11 may have been a period with less favourable environmental conditions, which would enhance the impact of logger attachments. A comparison between GPS and TDR birds showed a significant difference in dive depth frequencies with birds carrying larger GPS data loggers diving shallower. Mean and maximum dive depths were similar between GPS and TDR birds. We measured little impact of logger attachments on physiological parameters (corticosterone, protein, triglyceride levels and leucocyte counts). Overall, handling and short-term logger attachments (1–3 days) showed limited impact on the behaviour and physiology of the birds but care must be taken with the size of data loggers on diving seabirds. Increased drag may alter their diving behaviour substantially, thus constraining them in their ability to catch prey. Results obtained in this study indicate that data recorded may also not represent their normal dive behaviour. 相似文献
9.
Mechanisms that determine how, where, and when ontogenetic habitat shifts occur are mostly unknown in wild populations. Differences in size and environmental characteristics of ontogenetic habitats can lead to differences in movement patterns, behavior, habitat use, and spatial distributions across individuals of the same species. Knowledge of juvenile loggerhead turtles' dispersal, movements, and habitat use is largely unknown, especially in the Mediterranean Sea. Satellite relay data loggers were used to monitor movements, diving behavior, and water temperature of eleven large juvenile loggerhead turtles (Caretta caretta) deliberately caught in an oceanic habitat in the Mediterranean Sea. Hidden Markov models were used over 4,430 spatial locations to quantify the different activities performed by each individual: transit, low‐, and high‐intensity diving. Model results were then analyzed in relation to water temperature, bathymetry, and distance to the coast. The hidden Markov model differentiated between bouts of area‐restricted search as low‐ and high‐intensity diving, and transit movements. The turtles foraged in deep oceanic waters within 60 km from the coast as well as above 140 km from the coast. They used an average area of 194,802 km2, where most individuals used the deepest part of the Southern Tyrrhenian Sea with the highest seamounts, while only two switched to neritic foraging showing plasticity in foraging strategies among turtles of similar age classes. The foraging distribution of large juvenile loggerhead turtles, including some which were of the minimum size of adults, in the Tyrrhenian Sea is mainly concentrated in a relatively small oceanic area with predictable mesoscale oceanographic features, despite the proximity of suitable neritic foraging habitats. Our study highlights the importance of collecting high‐resolution data about species distribution and behavior across different spatio‐temporal scales and life stages for implementing conservation and dynamic ocean management actions. 相似文献
10.
Ronnie Reyes-Arriagada Paulo Campos-Ellwanger Roberto P. Schlatter Cheryl Baduini 《Biodiversity and Conservation》2007,16(4):913-930
Sooty Shearwater (Puffinus griseus) is the most common Procellariiform seabird along the south-eastern South American coast. In recent years the wintering population
off California has declined noticeably. This decline has been confirmed on the breeding grounds in New Zealand. In Chile,
knowledge of the population is limited. Investigations on Isla Guafo were carried out during two seasons (03/04 and 04/05),
beginning an ongoing monitoring and evaluation of the breeding population of this species in southern South America. On Isla
Guafo we estimate a population of about 4 million birds that nest above 150 m above sea level (m.a.s.l.) under a forest without
understory. Sooty Shearwaters on Isla Guafo prefer north and western slopes that we hypothesise protect them from the predominantly
southerly winds. Population of the species from New Zealand and Australia are compared with the Isla Guafo population and
the state of its conservation is discussed. 相似文献
11.
Jos Miguel Cerda Franco Lpez Pamela Palacios‐Fuentes F. Patricio Ojeda 《Zeitschrift fur angewandte Ichthyologie》2019,35(5):1147-1153
Connectivity among most marine species depends of their life cycles, and the main phase that can regulate dispersal is the larval stage of an organism. Girella laevifrons (Girellidae) is an omnivore fish inhabiting in intertidal pools as juveniles and subtidal reefs as adults from northern to central Chile. It has a pelagic larval duration for approximately 69 days. In this study, we used eight molecular markers (microsatellites) to explore the genetic structure of their populations along 400 km of the central Chilean coast.20 juveniles were sampled from four different populations. Microsatellite loci did not detect a genetic structure within a 400 km scale along the coast of Central Chile. There is evidence (Fst = ?0.0038, p = 0.8954) suggesting that populations between Coquimbo and Littoral Central behave as a single whole population. This could be an estimate that may define future management units for the species. 相似文献
12.
Dariusz Jakubas Piotr Indykiewicz Jarosaw Kowalski Tomasz Iciek Piotr Minias 《Ecology and evolution》2020,10(12):5489-5505
Using GPS loggers, we examined the influence of colony, sex, and bird identity on foraging flight characteristics of black‐headed gulls Chroicocephalus ridibundus during the incubation period. We studied tracks of 36 individuals breeding in one urban and two rural colonies in Poland. Birds from both rural colonies performed the furthest flights (mean max distance 8–12 km, up to 27 km) foraging mainly in agricultural areas. Gulls from the urban colony performed shorter flights (mean 5 km, up to 17 km) visiting mainly urbanized areas and water bodies. We found that females performed longer flights and their flight parameters were less repeatable compared to males. Males from both rural colonies visited water bodies more frequently than females. In all colonies, males (but not females) used habitats unproportionally to their availability in the vicinity. Relatively low interindividual and relatively high intraindividual overlap in home ranges indicated considerable foraging site fidelity. Individuals specialized in the use of a particular type of habitat performed shorter foraging flights compared to individuals using diverse habitats during their foraging flights. Our results indicate diverse foraging strategies of black‐headed gulls, including generalists that explore various habitats and specialists characterized by high foraging site and habitat fidelity. 相似文献
13.
Carlos Camacho 《Acta ethologica》2012,15(1):153-158
Flocking behaviour in birds reflects the outcome of a momentary trade-off between increased foraging efficiency and improved
predator avoidance. However, these changing patterns remain poorly known at any spatial or temporal scale. The aim of the
present study was first to investigate seasonal fluctuations of flocking behaviour throughout the entire distribution range
of a species and secondly to explore behavioural responses to daily temperature variations. From 2000 to 2010, sightings of
Peruvian Thick-knees (Burhinus superciliaris) were collected throughout Ecuador, Peru and Chile. There were strong differences in flocking behaviour between Chilean and
Peruvian populations. While Thick-knees occurred into few large year-round flocks in Chile, flock occurrence was highly seasonal
in Peru, where group size grew gradually from loose flocks at the end of the breeding season to a few large ones by the middle
of the year. Time of day seemed not to affect the species detectability but was negatively related to flock size. Variations
in the flocking behaviour of Peruvian Thick-knees throughout its distribution range suggest that aggregation patterns might
indicate individuals responding to seasonally fluctuating ecological pressures, such as those derived from predation, foraging
or climate. 相似文献
14.
Carlos B. Zavalaga Silvano Benvenuti Luigi Dall'Antonia Steven D. Emslie 《Journal of avian biology》2008,39(4):405-412
The association between the distribution of blue-footed boobies Sula nebouxii (BFB) and marine productivity around their breeding grounds is unclear. In Peru, they breed in a region seasonally influenced by the cold, nutrient rich Humboldt Current, and by warm, nutrient poor oceanic waters. The foraging range of BFB in Peru is unknown, although some evidence suggest that they may feed in warm offshore waters. During the austral winter 2002 and summer 2003, we tracked 26 BFBs breeding on Isla Lobos de Tierra, Peru (located approximately 15 km west of the mainland), during 59 feeding trips using small direction recorders to determine their marine habitat use. BFBs preferentially moved to the east of the island and foraged over the continental shelf in cold water masses where marine productivity and the abundance of the main prey, the Peruvian anchovy Engraulis ringens , are usually higher than in other areas. Overall, the median maximum foraging distance from the colony was 39 km (range 3–109 km), with 90% of all trips located within 30 km from the mainland, and enclosed in an area of 13,113 km2 . These results reveal that BFBs exploit the productive waters of the Peruvian Coastal Upwelling System, rather than open oceanic waters as previously suggested. BFBs travelled a greater distance, dispersed in a broader area, and visited more offshore waters during the winter 2002, than during the summer 2003, following the typical seasonal horizontal dispersion of the Peruvian anchovy. 相似文献
15.
T. D. Williams † D. R. Briggs J. P. Croxall ‡ Y. Naito A. Kato 《Journal of Zoology》1992,227(2):211-230
We present data on diving pattern and performance (dive depth, duration, frequency and organization during the foraging trip) in gentoo penguins Pygoscelis papua , obtained using time-depth recorders ( n = 9 birds, 99 foraging trips). These data are used to estimate various parameters of foraging activity, e.g. foraging range, prey capture rates, and are compared in relation to breeding chronology. Foraging trip duration was 6 h and 10 h, and trip frequency 1.0/day and 0.96/day, during the brooding and creche periods, respectively. Birds spent on average 52%of each foraging trip diving. Dive depth and duration were highly bimodal: shallow dives (< 21 m) averaged 4 m and 0.23 min, and deep dives (> 30 m) 80 m and 2.5 min, respectively. Birds spent on average 71%and 25%of total diving time in deep and shallow dives, respectively. For deep dives, dive duration exceeded the subsequent surface interval, but shallow dives were followed by surface intervals 2–3 times dive duration. We suggest that most shallow dives are searching/exploratory dives and most deep dives are feeding dives. Deep dives showed clear diel patterns averaging 40 m at dawn and dusk and 80–90 m at midday. Estimated foraging ranges were 2.3 km and 4.1 km during the brood and creche period, respectively. Foraging trip duration increased by 4 h between the brood and creche periods but total time spent in deep dives (i.e. time spent feeding) was the same (3 h). Of 99 foraging trips, 56%consisted of only one dive bout and 44%of 2–4 bouts delimited by extended surface intervals > 10 min. We suggest that this pattern of diving activity reflects variation in spatial distribution of prey rather than the effect of physiological constraints on diving ability. 相似文献
16.
Patterns of GPS tracks suggest nocturnal foraging by incubating Peruvian pelicans (Pelecanus thagus)
Most seabirds are diurnal foragers, but some species may also feed at night. In Peruvian pelicans (Pelecanus thagus), the evidence for nocturnal foraging is sparse and anecdotal. We used GPS-dataloggers on five incubating Peruvian pelicans from Isla Lobos de Tierra, Perú, to examine their nocturnality, foraging movements and activities patterns at sea. All instrumented pelicans undertook nocturnal trips during a 5–7 day tracking period. Eighty-seven percent of these trips (n = 13) were strictly nocturnal, whereas the remaining occurred during the day and night. Most birds departed from the island after sunset and returned a few hours after sunrise. Birds traveled south of the island for single-day trips at a maximum range of 82.8 km. Overall, 22% of the tracking period was spent at sea, whereas the remaining time was spent on the island. In the intermediate section of the trip (between inbound and outbound commutes), birds spent 77% of the trip time in floating bouts interspersed by short flying bouts, the former being on average three times longer than the latter. Taken together, the high sinuosity of the bird''s tracks during floating bouts, the exclusively nocturnal trips of most individuals, and the fact that all birds returned to the island within a few hours after sunrise suggest that pelicans were actively feeding at night. The nocturnal foraging strategy of Peruvian pelicans may reduce food competition with the sympatric and strictly diurnal Guanay cormorants (Phalacrocorax bougainvillii), Peruvian boobies (Sula variegata) and Blue-footed boobies (S. nebouxii), which were present on the island in large numbers. Likewise, plankton bioluminescence might be used by pelicans as indirect cues to locate anchovies during their upward migration at night. The foraging success of pelicans at night may be enhanced by seizing prey close to the sea surface using a sit-and-wait strategy. 相似文献
17.
The marine otter Lontra felina has been said to prefer wave-exposed habitats over more protected sites in response to a greater prey abundance in exposed
habitat. We examined how the foraging activity of L. felina is affected by the regime of wave exposure and prey availability at Isla Choros, northern Chile. Through focal sampling we
recorded time spent by otters in foraging, the duration of dives, and the hunting success on a wave-exposed and a wave-protected
site on the island. In addition, we quantified the abundance of prey in both habitats. Marine otters spent more time foraging
in the wave-protected site compared with the wave-exposed habitat. Successful dives reached 26.9% in the wave-exposed habitats,
and 38.2% in the wave-protected habitat. Foraging dives were 18% shorter in wave-exposed as compared with wave-protected habitat.
Numerically, available prey did not differ significantly with habitat. Our results are more consistent with the hypothesis
that wave-exposed habitats represent a sub-optimal habitat to foraging marine otters. Marine otters’ use of wave-exposed patches
through northern and central Chile coastal areas probably reflects a low availability of suitable protected areas and greater
human disturbance of more protected habitat. 相似文献
18.
Wing size and shape, expressed as wing loading and aspect ratio respectively, together with bill morphology are parameters that can reveal differences related to the foraging ecology of seabirds. Six species of booby (Sulidae) that inhabit the Pacific are the focus of this study: four mainly pelagic species, Masked Booby Sula dactylatra, Nazca Booby Sula granti, Red‐footed Booby Sula sula and Brown Booby Sula leucogaster, and two coastal species, Blue‐footed Booby Sula nebouxii and Peruvian Booby Sula variegata. Pelagic boobies showed segregation among species in body mass and relative bill size, and they differed in wing morphology (wing loading and aspect ratio) from the coastal boobies. The coastal Peruvian and Blue‐footed Boobies are largely allopatric but overlap in northern Peru. In their area of sympatry, they showed evidence of character displacement in body size and in wing and bill morphology, which suggests that competition plays an important role in sympatry. This study improves our understanding of ecological interactions among Pacific boobies and of how selective pressures have shaped their ecomorphology and foraging behaviours. 相似文献
19.
J.-B. Charrassin C. A. Bost K. Pütz J. Lage T. Dahier T. Zorn Y. Le Maho 《Oecologia》1998,114(2):194-201
For oceanic birds like king penguins, a major constraint is the separation of foraging areas from the breeding colony, largely
because swimming increases foraging costs. However, the relationship between foraging strategy and breeding stage has been
poorly investigated. Using time-depth recorders, we studied the diving behaviour of two groups of king penguins that were
either incubating or brooding chicks at Crozet Islands (Southern Indian Ocean) at the same period of the year. Although birds
with chicks had the highest predicted energy demand, they made foraging trips half as long as incubating birds (6 vs. 14 days)
and modified their time and depth utilisation. Birds with chicks dived deeper during daylight (mean maximum depth of 280 m
vs. 205 m for those incubating). At night, birds with chicks spent twice as much time diving as those incubating, but birds
at both stages never dived beyond 30 m. Movements to greater depths by brooding birds are consistent with the vertical distribution
of myctophid fish which are the main prey. As chick provisioning limits trip duration, it is suggested that it is more efficient
for parents to change their diving patterns rather than to restrict their foraging range.
Received: 23 June 1997 / Accepted: 3 November 1997 相似文献
20.
Sperm whale dive behavior characteristics derived from intermediate‐duration archival tag data
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Here, we describe the diving behavior of sperm whales (Physeter macrocephalus) using the Advanced Dive Behavior (ADB) tag, which records depth data at 1‐Hz resolution and GPS‐quality locations for over 1 month, before releasing from the whale for recovery. A total of 27 ADB tags were deployed on sperm whales in the central Gulf of California, Mexico, during spring 2007 and 2008, of which 10 were recovered for data download. Tracking durations of all tags ranged from 0 to 34.5 days (median = 2.3 days), and 0.6 to 26.6 days (median = 5.0 days) for recovered tags. Recovered tags recorded a median of 50.8 GPS‐quality locations and 42.6 dives per day. Dive summary metrics were generated for archived dives and were subsequently classified into six categories using hierarchical cluster analysis. A mean of 77% of archived dives per individual were one of four dive categories with median Maximum Dive Depth >290 m (V‐shaped, Mid‐water, Benthic, or Variable), likely associated with foraging. Median Maximum Dive Depth was <30 m for the other two categories (Short‐ and Long‐duration shallow dives), likely representing socializing or resting behavior. Most tagged whales remained near the tagging area during the tracking period, but one moved north of Isla Tiburón, where it appeared to regularly dive to, and travel along the seafloor. Three whales were tagged on the same day in 2007 and subsequently traveled in close proximity (<1 km) for 2 days. During this period, the depth and timing of their dives were not coordinated, suggesting they were foraging on a vertically heterogeneous prey field. The multiweek dive records produced by ADB tags enabled us to generate a robust characterization of the diving behavior, activity budget, and individual variation for an important predator of the mesopelagos over temporal and spatial scales not previously possible. 相似文献