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Duncan Murrell - A Whale of a Time

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Duncan Murrell - A Whale of a Time

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  • This photo clearly illustrates how distended the whales’ throat becomes when they lunge to the surface. They can dislocate their jaws like a snake does, and when they first reach the surface their jaws are open almost a full 180 degrees and their throat-poach hangs from their lower jaw like the throat-pouch of a pelican. The colouration of the throats varies and it was another means of identifying individuals. The open ventral pleats of this one appear to be pink because of the lack of pigmentation revealing the blood-rich tissue beneath. They really are a curious sight when their throats are fully distended like that, and they reminded me of Jabba the Hutt from the Star Wars movies.<br />
The formation of this bubble net feeding group also shows how there is always at least one lead whale that surfaces vertically, while the rest appear in a more lateral position around it. The individual whales that are regular members of the feeding group always maintain the same position in the tightly choreographed arrangement during the feeding ascent.
    Alaska-humpbackwhale-bubblenet3.tif
  • This was the "Famous Five" group of bubble netters that I became so familiar with around the Morris Reef at Point Hayes. I became familiar with all of their physical differences like the colouration and markings under their throats. The one on the left was the most distinctive with its pink throat and the circular scars where barnacles had dropped off; it was always one of the lead whales that lunged vertically. Humpback whales are usually identified by the distinctive colouration, markings and scars on the ventral side of the flukes. I could also identify them by the distinctive sound of each blow: some are more explosive: some more guttural: some sound like a ricochet: some are more like sneezes.
    Alaska-humpbackwhale-bubblenet7.jpg
  • Humpback whales (Megaptera novaeangliae) cooperative feeding using a bubble net, I You Seen Cove, Chatham Strait, Southeast Alaska, USA.
    Alaska-humpbackwhale-bubblenet30.jpg
  • Alaska-humpbackwhale-bubblenet23.jpg
  • Alaska-humpbackwhale-bubblenet29.jpg
  • Humpback whales (Megaptera novaeangliae) cooperative feeding using a bubble net, Morris Reef, Point Hayes, Chatham Strait, Southeast Alaska, USA.
    Alaska-humpbackwhale-bubblenet26.jpg
  • The seabirds were such an integral part of my experiences with bubble net feeding whales. They followed the feeding whales just as tirelessly as I did from dawn to dusk, and probably beyond. I sometimes relied on them as an early-warning system to indicate where the whales were going to be surfacing, although quiet a lot of times there were false alarms and sometimes there were two different "opinions' going in opposite directions. It wasn't so important to watch them if it was calm because I could usually see the circle of bubbles on the surface, and estimate where the middle of the bubble net was. It was then just a matter of trying to stay as close to the bubbles as possible to avoid the centre where they would be surfacing. But sometimes if the sea was a bit choppy it became a bit more ambiguous because I couldn't tell which way the circle was curving. The best indicators if ever they were around were the sea lions, that always knew exactly where the whales were underwater.
    Alaska-humpbackwhale-bubblenet4.jpg
  • Alaska-humpbackwhale-bubblenet17.jpg
  • The tightly packed baleen plates are clearly visible. They are smooth on the outside, and coarse and bristly on the inside. They have a series of 270-400 fringed overlapping plates hanging from each side of the upper jaw, where teeth might otherwise be located.
    Alaska-humpbackwhale-bubblenet31.jpg
  • This photo was taken near the Tlingit village of Kake on Kupreanof Island and illustrates the problems of the practice of clear-cut logging that persisted during the 1980s and 90s when I was based in Southeast Alaska. The extent of clear-cutting was much worse around native communities because the Alaska Native Claims Settlement Act of 1971 (ANCSA) awarded approximately 148,500,000 acres (601,000 km2) of Federal land in Alaska to private native corporations which were created under ANCSA. Transference of public National Forest land to a privately owned corporation removes it from protection by Federal law and allows the owners to use the land in whatever way they see fit without regard to the effects of the use on surrounding lands and ecosystems. This fact has caused much controversy involving the business interests of Native Regional Corporations and the personal interests of local Natives and non-Native residents of Southeastern Alaska, such as subsistence hunting and tourism.
    Alaska-humpbackwhale-bubblenet6.jpg
  • Alaska-humpbackwhale-bubblenet22.jpg
  • The left eye of the whale in the foreground is clearly visible and shut. The whales are lunging at such close proximity that they usually close their eyes to protect them from any damage, particularly from the flippers that are usually heavily encrusted with barnacles. Whales that are regular members of these teams of bubble net feeders are very distinctive because of all of the scratches inflicted on their bodies by barnacles.
    Alaska-humpbackwhale-bubblenet16.jpg
  • Alaska-humpbackwhale-bubblenet8.jpg
  • Humpback whales generally have heavy encrustations of barnacles on their throats, pectoral fins and flukes. Whale barnacles are barnacles belonging to the family Coronulidae. Whale barnacles attach themselves to the bodies of baleen whales during the barnacles's free-swimming larval stage. Though often described as parasites, the relationship is an example of obligate commensalism, as the barnacles neither harm, nor benefit, their host. But they are parasitised by whale lice that are actually amphipods: tiny crustaceans that feed off dead skin and pieces of flesh from their host. In normal situations, population of these parasites seem to stay in check, thereby not hurting their large hosts. Cetacean cyamid species are specific to different species of cetaceans and the one that lives on humpbacks is Cyamus boopis.
    Alaska-humpbackwhale-bubblenet32.jpg
  • This feeding group clearly illustrates a typical formation with either one or two lead whales ascending vertically out of the water and the rest surfacing on their sides. Sometimes there was more than one lead whale, but quite often it was just one.
    Alaska-humpbackwhale-bubblenet19.jpg
  • This was a typical bubble net feeding group with a permanent core of six individuals, but the size of the group would sometimes expand to about ten with the arrival of “guests”.
    Alaska-humpbackwhale-bubblenet18.jpg
  • This was the photo that won the Mammal Behavior Category in the BBC Wildlife Photographer of the Year Competition in 2002. It wasn’t until after I attended the award ceremony at the Natural History Museum that I discovered that many of the judges were unhappy that it wasn’t awarded the title of the overall winner of the competition, and I subsequently discovered that that was the general public consensus as well. It was unfortunate that the controversy that surrounded the overall winner that year soured such a proud moment in my photographic career. I was contacted a few years later by the new head of the judging panel, Mark Carwardine, to ask for any guidelines for submitting a winning photo, because he felt that my photo was the best entry that year. C’est la vie !<br />
But the moment that can never be diminished or tainted was the moment that I captured the image. I was photographing a bubble net feeding group very near the community of Tenakee Springs, which can be seen to the left of the whale. They came up behind me and I can clearly remember zooming my lens back so that I could fit the entire throat of the whale into the photo, and fortunately I was just able to do that or else it might not have been a perfect award-winning photo.
    Alaska-humpbackwhale-bubblenet33.jpg
  • It seemed like there was an ever-increasing number of pleasure boats every year from the early days when sometimes I was blissfully alone with the whales all day. There was an increasing number of whale-watching boats as well as research boats; on one occasion i witnessed twenty different boats surrounding a pod of bubble netting whales. Most of the time the whales just continued their behaviour uninterrupted, but sometimes I witnessed them aborting their lunging and moving away to get away from a particularly noisy and intrusive boat, which included a research boat on one occasion.
    Alaska-humpbackwhale-bubblenet28.jpg
  • I became very familiar with the individual whales that made up the cooperative bubblenet feeding groups. I could identify them by their flukes, markings on their throats, barnacles and even sometimes by the sounds they made.<br />
I had known Dr Fred Sharpe of the Alaska Whale Foundation for many years during his research into the cooperative bubble net feeding strategies employed by the humpback whales of Southeast Alaska. He was particularly interested in the genetic relatedness of individual whales within and between cooperative pods, in addition to the local genetic sub-structuring of the population. He discovered that social foraging humpback whale pods possess a social complexity that is rarely observed in baleen whales. For example, individuals within these groups may develop long-term associations that may last for many years. There also appears to be a division of labour, with particular whales constantly leading the group, deploying the bubble nets, and producing the feeding calls. Furthermore, on each lunge, each whale in the group maintains the same position, indicating that this is an intrinsically choreographed feeding maneuver. My own personal observations with the same feeding groups over the course of the summer also bore this out. I observed how there were always core members of a group but other individual whales appeared to join them on a much more ad hoc basis before moving off again.<br />
He ascertained that it is only the more elusive, shoaling prey, such as Pacific herring, that require the same level of cooperative cohesiveness; easier prey such as krill do not require the same sophisticated feeding strategies as do shoaling fish.
    Alaska-humpbackwhale-bubblenet15.jpg