Offshore Distances of Bowhead Whales (&lt;i&gt;Balaena mysticetus&lt;/i&gt;) Observed during Fall in the Beaufort Sea, 1982–2000: An Alternative Interpretation

Gleason, Jeffrey S.; Cowles, Cleveland J.

doi:10.14430/arctic367

Cited by 8 publications

(14 citation statements)

References 16 publications

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“…1). Our study area includes the eastern two-thirds of the U.S. Minerals Management Service (MMS) Eastern Region (Treacy, 2000). Almost all of the available data came from areas with waters no deeper than 200 m.…”

Section: Methodsmentioning

confidence: 99%

“…many of the data presented here were obtained during a study of the importance of the central Beaufort Sea to bowhead whales (Richardson and Thomson, 2002). On three to six occasions during each year in 1985 -86 and 1998 -2000, we, the MMS, or their contractors (Treacy, 2000) conducted a systematic survey of the entire study area (Fig. 1A) to determine the distribution of bowheads (Fig.…”

Section: Effort To Obtain Photographsmentioning

confidence: 99%

“…in addition, a traditional bowhead hunt occurs near Kaktovik, and interactions among the proposed developments, the traditional harvest, and future changes in bowhead use of different parts of the central Beaufort Sea may need to be evaluated. Also, recent studies have found a relationship between sea-ice cover and bowhead whale distribution (Moore et al, 2000;Treacy et al, 2006), so reductions in summer and autumn sea-ice cover due to global warming may result in changes to bowhead distribution. Finally, the bowhead whale population is increasing (George et al, 2004;Zeh and Punt, 2005) and includes a high proportion of immature animals (Angliss et al, 1995;Koski et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Habitat Use by Different Size Classes of Bowhead Whales in the Central Beaufort Sea during Late Summer and Autumn

Koski¹,

Miller²

2009

ARCTIC

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The frequency distributions of bowhead whale (Balaena mysticetus) size classes were studied as functions of year, location, water depth, and date. Whales were classified by size and status as calves, small subadults (non-calves < 10 m); large subadults (10-13 m); and adults (> 13 m). Adults include mothers with calves, which were also counted separately. During mid-August to early October of 1982, 1984-86, and 1998-2000, calibrated vertical photography was used to obtain known-scale images of 901 different whales in waters up to 200 m deep between Flaxman and Herschel islands (146˚ to 139˚ W) in the central Beaufort Sea. Age composition of the whales photographed over all years of our study was calves 6.2%, small subadults 31.4%, large subadults 33.3%, and adults 29.1%. We found proportionally more subadults and fewer adults than are estimated to be in the overall population, and this result was found both before and after making allowance for reduced effort to obtain photographs early and late in the migration period. Thus parts of the central Beaufort Sea up to 200 m deep appear to be more heavily used by subadult bowheads than by adults in most years. Significant interannual variation existed in length-frequency distributions of whales among years, geographic subdivisions of the study area, water depth categories, and time periods. This variation was due to variable use of the study area by each size class in different years, differences in the water depths used by different size classes, and different migration timing by each size class. in all years, small subadult whales were the dominant group in shallow (< 20 m) nearshore habitats, and the size of the whales increased with increasing water depth. Timing of movements into and through the study area were also related to size class: small subadults arrived first in late August and departed in late September, and adults arrived last in late September. Mothers and calves arrived in early September and were common until at least early october.

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Section: Methodsmentioning

confidence: 99%

Section: Effort To Obtain Photographsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Habitat Use by Different Size Classes of Bowhead Whales in the Central Beaufort Sea during Late Summer and Autumn

Koski¹,

Miller²

2009

ARCTIC

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“…Treacy et al. ). In the Okhotsk Sea, a genetically and geographically distinct population of bowhead whales aggregates to feed in Shelikhov Bay and at Shantar, but little is known of their winter distribution within the Okhotsk Sea (Ivashchenko & Clapham ).…”

Section: Mediterranean Fin Whale Migration In Contextmentioning

confidence: 99%

“…Populations of bowhead whales move seasonally within the wider arctic area, albeit on a smaller geographical scale (e.g. Treacy et al 2006). In the Okhotsk Sea, a genetically and geographically distinct population of bowhead whales aggregates to feed in Shelikhov Bay and at Shantar, but little is known of their winter distribution within the Okhotsk Sea (Ivashchenko & Clapham 2012).…”

Section: Comparison With Other Baleen Whale Species and Populationsmentioning

confidence: 99%

Mysticete migration revisited: are Mediterranean fin whales an anomaly?

2016

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1.The generally accepted model of Mysticete whale migration is that most individuals undertake seasonal migrations between high and low latitudes. Although numerous exceptions have been described in the literature, the traditional model remains unexamined. This paper represents the first 'official' challenge to the traditional model of Mysticete migration. 2. We set out to review the current state of knowledge on the Mediterranean fin whale migratory pattern, and to examine whether the small, resident population in the Mediterranean is an anomaly within the framework of the traditional model of Mysticete migration. We investigated the prevalence of alternative migratory strategies among the Mysticete whales, reviewing the migratory habits of the Mediterranean fin whales and those of other fin whale and baleen whale populations. 3. We reach three main conclusions. First, the seasonal behaviour of the resident Mediterranean fin whales is highly dynamic, and a decade of research has not clarified prevailing uncertainties regarding migration patterns. Second, migration strategies similar to those observed in the Mediterranean fin whales are commonly seen in other populations of baleen whales. Third, the traditional model of whale migration is too simplified to describe the repertoire of Mysticete migratory behaviours accurately. 4. We argue that the paradigm of baleen whale migration warrants further scrutiny to account for more complex movement strategies. We suggest that Mysticete migration should be thought of as a continuum of different strategies that have evolved in the face of different selective pressures. Instead of representing an exception to the rule, the resident Mediterranean fin whales may in fact fall towards one end of a larger spectrum of migratory behaviours. A greater knowledge of ecological factors, reproductive patterns, and local adaptations will be needed to understand the evolutionary mechanisms behind the diversity of migratory habits. bs_bs_banner

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Effects of seismic operations on bowhead whale behaviour : implications for distribution and abundance assessments

Robertson¹

2014

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Offshore Distances of Bowhead Whales (<i>Balaena mysticetus</i>) Observed during Fall in the Beaufort Sea, 1982–2000: An Alternative Interpretation

Cited by 8 publications

References 16 publications

Habitat Use by Different Size Classes of Bowhead Whales in the Central Beaufort Sea during Late Summer and Autumn

Habitat Use by Different Size Classes of Bowhead Whales in the Central Beaufort Sea during Late Summer and Autumn

Mysticete migration revisited: are Mediterranean fin whales an anomaly?

Effects of seismic operations on bowhead whale behaviour : implications for distribution and abundance assessments

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