The islands of Hawaii emerged from the ocean over a period of 6
million years. The formation began with Kauai 6 million years ago, with the Big
Island (1.3 million years ago) currently the only island still growing. As each
new island was formed, it was colonized by plants and animals from the older
islands and as they spread out to fill each island’s ecological niches, a
wealth of new species emerged.
Previously, DNA analysis led some biologists to concluded that
the evolutionary diversification in Hawaii has yet to reach its peak. However,
new analysis found that biodiversity on the islands peaked millions of years
ago. Stress on island flora and fauna began several million years ago due to shrinking
land areas of the older islands. With the exception of the Big Island, all of
the islands of Hawaii experiences a decrease in species diversity.
Figuring out the evolutionary trajectory of life on the islands
isn’t as straightforward as it is on land that has been established for
billions of years. Without a fossil record, it is difficult to conclude whether
diversity is increasing or decreasing. While past studies claimed that
evolutionary diversity has yet to peak, a new study by researches at UC
Berkeley shows otherwise.
This conclusion was made following recent studies and their previous
work which suggested that the only way to explain why some mammal groups in the
past declined over millions of years was that the carrying capacity of the
ecosystem crashed.
Source http://news.berkeley.edu/2017/03/16/hawaiian-biodiversity-has-been-declining-for-millions-of-years/
Posted by Haley Huang, Group A
Vey interesting post Haley! There was a lot of new information in here that I didn’t know before. I think it’s really fascinating that an island can grow as you stated in the beginning of your post. I wonder how long this process takes. Although it is sad that the islands of Hawaii have reached their biodiversity peak so long ago, I thought that this was an interesting topic of research. I want to learn more about how researchers go into an area of land and find out the entire ecosystem composition and then compare it over time. It sounds very time-consuming, but also very rewarding!
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I would totally believe that biodiversity in Hawaii is decreasing because over time I think the islands have become overwhelmed by tourists and taken over by resorts and destroyed by humans to become vacation spots. I think that as the years go by there could be a decline in the number of species that the islands of Hawaii have. It's pretty sad that this is the case because like you wrote in your post, there were once a wealth of new species that emerged from the islands. I think scientists researching the biodiversity of the islands would be beneficial, although expensive and time consuming, because it can be a step towards preserving what is left of plant and animal life on the islands.
ReplyDeletePosted by Ana Carolina Nepomuceno
I agree that now, the biggest threat to biodiversity is due to human disturbance. What I thought was really interesting about the article is that they found that island biodiversity peaked long before human settlement, possibly due to having reached their carrying capacity or due to stress on animal or plant inhabitants from land loss. Researching biodiversity of the islands is definitely worth it, in my eyes, because like you said, it's a step towards preserving what is left. The hard part is that conservationists now have to account for human disturbance plus the natural decline in biodiversity ever since the islands stopping growing.
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Natural herbs have cured so many illness that drugs and injection can't
Deletecure. I've seen the great importance of natural herbs and the wonderful
work natural herbs have done in people's lives. i read a lot of people's
testimonies online on how they were cured of Herpes, HIV, Diabetics,
Lymphoma, Fibroid, Cancer etc by Dr. VOODOO herbal medicine, so i decided
to contact the doctor because i know nature has the power to heal anything.
I was diagnosed with HIV for the past 7 years but Dr. VOODOO cured me with
his herbs and i referred my aunt and her husband to him immediately because
they were both suffering from herpes but to God be the glory, they were
cured too .I know is hard to believe but am a living testimony. There is no
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Island biodiversity is a great topic to read about. It's so interesting that such small secluded spaces can host so many different species. It is disappointing that Hawaii's biodiversity has reached its peak but it's also kind of hard to believe because there are still so many plant and animal species on the islands.
ReplyDeletePosted by Hannah Jordan (B)
This was an interesting topic! I know that Hawaii is the healthiest state in the country, so maybe that also has some correlation to animal diversity? I mean, they're both occupying the land! But I also agree with what Ana said, on how there may be a decline because of tourists and resorts.
ReplyDeletePosted by Natalie Nou (group C)
I did not know how relatively young the islands of Hawaii were before reading this. It must be tough to calculate biodiversity without a solid fossil record. It makes sense that the peak biodiversity on the islands has already occurred. In this day in age, I can image how it can only continue to decrease. As mentioned above, I’m sure tourism has taken a major toll on the plants and animals found on Hawaii. But climate change also comes to mind. Being a remote island chain, Hawaii is extremely susceptible to experiencing the effect of sea level rise. I find it hard to believe that the Big Island is still in the process of growing. Sea level rise has been occurring and will probably rapidly increase, most likely even further decreasing the biodiversity on Hawaii.
ReplyDeletePosted by Taylor Irwin
Honestly domestic cats are horrendously devastating to island biodiversity, especially with respect to birds. In Hawaii, the various honeycreeper species have been moved to an endangered status due to overhunting by cats. This isn't a trend that's exclusive to Hawaii either. In New Zealand, the kakapo was nearly driven to extinction by roaming cats. So here's a PSA: keep your cats indoors; the birds that they kill are far more valuable to the ecosystem than your cat's entertainment.
ReplyDeletePosted by Owen Mulledy (C)
Domestic cats are definitely a danger to island biodiversity. But what I thought was interesting was that the article talked about how island biodiversity reached it peak even before human influence. I think the "problem" here is that the islands are no longer growing (with the exception of the Big Island) so the stress of shrinking land area or that the islands have reached their carrying capacity.
DeletePosted by Haley Huang, Group A
This was a really interesting post! I didn't realize how young the Hawaiian Islands were or that all of them except Big Island are shrinking. I am kind of surprised that some scientists believe that evolutionary diversification on the Hawaiian Islands has yet to reach its peak. I would think that with all of the human impacts, such as those related to tourism and global warming, the evolutionary diversification would be declining.
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Herbs, quickly I copied his email just to give him a test I spoke to him, he asked me to a preparation for the herbs items, of which I did exactly what he instructed me to do, he told me that he is going to provide the herbal cure to me, which he
did, few days after i went back to the same hospital that previously confirmed me as Herpes virus positive and this time the result declared me negative to the deadly virus of Herpes virus....so I decided to share my testimony, that nothing is impossible with God, God use a man to healed me. No matter what you are passing through, no matter how deadly the sickness is and no matter what the situation is God that did mine is still going to do yours, suffering from AIDS, ALS,hiv/aids,copd, asthma.. Cancer, any kind of disease, you can rich him now via ? Gmail address: ( nativehealthclinic@gmail.com) or WhatsApp number +2348140073965
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