Antarctic minke whales find ice gaps along the ice edge in foraging grounds of the Indo-Pacific sector (60° E and 140° E) of the Southern Ocean

Konishi, Kenji; Isoda, Tatsuya; Bando, T.; Minamikawa, Shingo; Kleivane, Lars

doi:10.1007/s00300-020-02638-x

Cited by 8 publications

(14 citation statements)

References 76 publications

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“…Judging from the movement pattern and dive behaviour of the one TDR-tagged AMW, we hypothesize that AMWs may progressively deplete their forage, especially krill close to the surface, as they move to different areas, concentrating in one location for several days before moving to the next area that has dense prey patches. Similar movement along the edge of consolidated sea ice was also noted by Konishi et al (2020). In regard to our study, considering that the tag was duty cycled (hence there were periods of no data), we note that the tagged whale undertook dives nearly continuously during the entire 2.5 month dive record.…”

Section: Discussionsupporting

confidence: 84%

“…Our effort to investigate AMW foraging behaviour was limited to three whales satellite tagged in 2013, including one with a TDR with which we could quantify diving frequency and depth while the whale foraged along and beneath the McMurdo Sound fast-ice edge. These offered a significant increase in AMW biologging data; Konishi et al (2020) also had a small sample size (three whales in each of two summers), but only to track movements and not diving. Friedlaender et al (2014) investigated the behaviour of two AMWs foraging for Antarctic krill within the pack ice-covered waters of the WAP, the only other AMW tagging results of which we are aware.…”

Section: Discussionmentioning

confidence: 99%

“…Instead, in the south-west Ross Sea, AMWs compete with ADPEs (Ainley et al 2006(Ainley et al , 2015, as well as other predators (Smith et al 2014). Off East Antarctica, Konishi et al (2020) investigated AMW movements, but not foraging behaviour.…”

Section: Introductionmentioning

confidence: 99%

“…Friedlaender et al 2006, 2009, 2011, 2014), with less effort being expended on occurrence patterns (Dominello & Sirović 2016, Lee et al 2017; though see a large-scale view in Branch 2006). On the other hand, in the Ross Sea, its seasonal occurrence patterns and habitat associations have been well studied (Ainley et al 2012, 2017, Ballard et al 2012, Murase et al 2013) - and to a lesser degree in the waters off East Antarctica (Konishi et al 2020) - but its foraging behaviour is not well known, despite investigations on the effects of apparent trophic competition with co-occurring Adélie penguins (ADPEs; Pygoscelis adeliae Hombron & Jacquinot; e.g. Ainley et al 2006, 2007, 2015, Saenz et al 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Among various foraging strategies, AMWs exploit openings (e.g. leads and polynyas) within the pack ice (Tynan et al 2010, Konishi et al 2020). AMWs reach the McMurdo Sound Polynya, Ross Sea, and its marginal ice zone (MIZ) in late December, moving westward in accord with the westward retreat of the Ross Sea Polynya MIZ (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Foraging patterns of Antarctic minke whales in McMurdo Sound, Ross Sea

et al. 2020

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Evidence indicates that Antarctic minke whales (AMWs) in the Ross Sea affect the foraging behaviour, especially diet, of sympatric Adélie penguins (ADPEs) by, we hypothesize, influencing the availability of prey they have in common, mainly crystal krill. To further investigate this interaction, we undertook a study in McMurdo Sound during 2012–2013 and 2014–2015 using telemetry and biologging of whales and penguins, shore-based observations and quantification of the preyscape. The 3D distribution and density of prey were assessed using a remotely operated vehicle deployed along and to the interior of the fast-ice edge where AMWs and ADPEs focused their foraging. Acoustic surveys of prey and foraging behaviour of predators indicate that prey remained abundant under the fast ice, becoming successively available to air-breathing predators only as the fast ice retreated. Over both seasons, the ADPE diet included less krill and more Antarctic silverfish once AMWs became abundant, but the penguins' foraging behaviour (i.e. time spent foraging, dive depth, distance from colony) did not change. In addition, over time, krill abundance decreased in the upper water column near the ice edge, consistent with the hypothesis (and previously gathered information) that AMW and ADPE foraging contributed to an alteration of prey availability.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Foraging patterns of Antarctic minke whales in McMurdo Sound, Ross Sea

et al. 2020

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In‐situ observations of the sensory hairs of Antarctic minke whales (Balaenoptera bonaerensis)

Reichmuth

Casey

Friedlaender

2021

The Anatomical Record

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The sense of touch in the largest marine mammals is poorly understood. While mysticetes possess specialized sensory hairs that are present through adulthood, descriptions of these structures are based almost entirely on examination of tissues in post‐mortem individuals. Sensory hairs have rarely been observed and described in living whales. We photographed Antarctic minke whales Balaenoptera bonaerensis in the Western Antarctic Peninsula and used high‐resolution images to describe the number, distribution, orientation, and relative size of sensory hairs in freely swimming individuals. Sensory hairs were well developed. They were distributed on the tip of the lower jaw, the margins of the upper and lower jaw, and near the blowhole. Far fewer hairs were observed than reported for other mysticete species, including the related species Balaenoptera acutorostrata. Placement and apparent stiffness of sensory hairs within living tissue combined with observations and images of moving whales suggest these structures aid in detecting air and ice interfaces, and possibly, the boundaries of submerged prey fields.

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Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s

Cunen

Walløe

Konishi³

et al. 2021

Polar Biol

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Changes in the body condition of Antarctic minke whales (Balaenoptera bonaerensis) have been investigated in a number of studies, but remain contested. Here we provide a new analysis of body condition measurements, with particularly careful attention to the statistical model building and to model selection issues. We analyse body condition data for a large number (4704) of minke whales caught between 1987 and 2005. The data consist of five different variables related to body condition (fat weight, blubber thickness and girth) and a number of temporal, spatial and biological covariates. The body condition variables are analysed using linear mixed-effects models, for which we provide sound biological motivation. Further, we conduct model selection with the focused information criterion (FIC), reflecting the fact that we have a clearly specified research question, which leads us to a clear focus parameter of particular interest. We find that there has been a substantial decline in body condition over the study period (the net declines are estimated to 10% for fat weight, 7% for blubber thickness and 3% for the girth). Interestingly, there seems to be some differences in body condition trends between males and females and in different regions of the Antarctic. The decline in body condition could indicate major changes in the Antarctic ecosystem, in particular, increased competition from some larger krill-eating whale species.

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Antarctic minke whales find ice gaps along the ice edge in foraging grounds of the Indo-Pacific sector (60° E and 140° E) of the Southern Ocean

Cited by 8 publications

References 76 publications

Foraging patterns of Antarctic minke whales in McMurdo Sound, Ross Sea

Foraging patterns of Antarctic minke whales in McMurdo Sound, Ross Sea

In‐situ observations of the sensory hairs of Antarctic minke whales (Balaenoptera bonaerensis)

Decline in body condition in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean during the 1990s

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