Humpback Whales Form Mysterious Super-Groups Off The Coast Of South Africa

By on

CCSS NAS-3 Word Search
Super-groups of humpback whales off the coast of South Africa (Photo Credit: Findlay PLOS One)

Like the rest of their species, the Southern Hemisphere humpbacks, or Megaptera novaeangliae, are not social animals. The baleen whales typically prefer to remain solo or amalgamate in small groups which disperse quickly. However, since 2011, researchers from the Cape Peninsula University of Technology in Cape Town have been observing a new phenomenon off the coast of South Africa — large swarms of whales, comprising anywhere from 20 to 200 individuals. Professor Ken Findlay and his team reported seeing 22 instances of the large groups on three different occasions in 2011, 2014, and 2015.

The researchers are not just mystified by the unusual social behavior but also that the “super-groups” were seen in October and November. That’s because the mammals typically spend these late summer months (in the Southern Hemisphere), feeding in the Antarctic waters before heading back to the warmer subtropical South African waters during winter, to breed and give birth. In a study published in the journal PLOS One on March 1, Findlay and his team outline some of the plausible reasons behind the drastic change in the mammals’ behavior.

Humpback whale breaching (Photo Credit: Whit Welles Wwelles14 CC BY 3.0 via Wikimedia Commons

The researchers say that the cause of the recent sightings could be because the baleen whales may have finally discovered the abundant food available in the Benguela Upwelling System. Located near the southwestern tip of South Africa between St. Helena Bay and Cape Point, the system of cold, nutrient-rich ocean currents is rich in phytoplanktons and species of small fish, such as the mantis shrimp, that the humpbacks feed on.

Another probable reason is the dramatic increase in humpback whale population. According to a recent scientific report, the mammals’ population, off the coast of Australia, has reached nearly 90 percent of pre-whaling numbers, while on the US East Coast, the number of whales is up 60 percent from its lows. All in all, experts estimate there are currently 150,000 humpback whales swimming in our oceans, a number that is large enough to remove them from the endangered species list that they have been a part of, since the 1970’s. Given that the massive creatures need between 4400 to 5500 pounds of food daily, the scientists speculate they have been forced to seek alternate feeding grounds.

Super-groups off the coast of South Africa (Photo Credit: Findlay PLOS One)

However, while the theories may explain the decision to skip migrating to Antarctic waters, the reason for the social super-groups remains a mystery. According to Findley, “It's possible that the behavior was occurring but just not where it was visible. Because there were so few of them, we may not have seen it." With the increased numbers, it is easier to observe the whales feeding and frolicking together. The researchers are hopeful of seeing more of such long-lost behaviors as the whale population continues to grow. Meanwhile, the mammal swarms have made the South African coast a very popular location for humpback fans worldwide!

Resources: smithsonianmag.com, newscientist.com, journal.plos.org

Generate citations in MLA, APA & Chicago formats for this article.

VocabularyPlay Game

abundantamalgamatecomprisingdispersedrasticendangeredfrolickinginstancesmassivemigratingmystifiedphenomenonphytoplanktonsplausibleprobablespeculateswarmsvisible
Name:
Date:

Reading Comprehension (7 questions)

  1. What kind of social behavior do Southern Hemisphere whales normally demonstrate?
  2. What have researchers been recently observing off the coast of South Africa?

Critical Thinking Challenge

Why was it important for the scientists to observe the whale...

Vocabulary in Context

“Given that the massive creatures need between 4400 to 5500 pounds of food daily, the scientists speculate they have been forced to seek alternate feeding grounds.”

...
346 Comments
to use your custom avatar.
  • hiMonday, October 16, 2017 at 2:31 pm
    dis kool
    • Tamaliyah❤️💎Sunday, August 6, 2017 at 4:20 pm
      THATS SO SO COOL I WISH I COULD SEE THAT IN REAL LIFE THAT WOULD BE A DREAM COME TRUE!!!!!❤️❤️
      • turtlesturtles
        turtlesturtlesThursday, June 8, 2017 at 6:51 am
        So weird, I can't imagine how big a group of 200 would be seeing as they're so big
        • PoppTuesday, May 30, 2017 at 9:11 am
          Wow
          • jadenThursday, May 25, 2017 at 6:49 pm
            super cool
            • dezdezdezlcc
              dezdezdezlccThursday, May 25, 2017 at 1:18 pm
              I love this article and I love Whales
              • Animal loverMonday, May 22, 2017 at 6:26 pm
                I am a animal lover and that's a good sigh that there in big groups
                • herovange
                  herovangeFriday, May 19, 2017 at 4:50 am
                  Wow! Never thought of that there social
                  • ChickenLegsThursday, May 18, 2017 at 12:53 pm
                    Wow! I always found animals, social and all, very interesting!
                    • peopleMonday, May 15, 2017 at 3:05 pm
                      cool

                      Recent Comments

                      kawaiireporter

                      HAPPY DIWALI!! I am celebrating ...
                      Diwali, India's Glittering Festi...

                      Alex wrote:

                      Good for them!
                      Saudi Arabia Lifts Ban On Women ...

                      Alexander wrote:

                      I'm so glad that their dog made ...
                      Brave Dog Saves Family Goats And...

                      Our Apps and Plugins

                      ALA