As many people know, climate change has had a large effect on our world. From rising temperatures, to the melting of the ice caps we have all noticed these changes. The same goes for the plant and animal world. Many behaviors and life changes in various organisms is triggered by the climate. Phenology is how scientists study the cyclical events in an organism’s life; such events can be triggered by rainfall, temperature, and/or photoperiod. Environmental cues, such as changing temperature, are how plants and other organisms know it is time to bloom, to migrate, or to breed. When climate changes and temperatures start to warm or cool too early or too late in a season, it can through off an entire ecosystem. For example a flower may bloom at the same time as a pollinator migrates to an area. If the plant blooms early due to warmer temperatures, it may die or no longer be in bloom when the pollinator arrives at the normal time of bloom. This phenomena is called ecological mismatch and can have long-lasting effects on ecosystems. Looking back on previously recorded data could help ecologists understand and predict cycles of warming that could lead to ecological mismatch.

(Photo credit: publicdomainpictures)
One common phenology cycle that many people are familiar with is that of the cicada. Found in the Eastern-half of the United States, broods of cicadas follow thirteen or seventeen year cycles in which they are dormant underground and then emerge for around a month. In 2017 scientists noticed that along with the thirteen year cycle broods, the seventeen year cycle broods had also emerged. The mass occurrence of cicadas in 2017, according to the article written by Knvul Sheikh, experts say could be linked to climate change. Cicadas don’t emerge from the ground until the reach their adult state. Experts say that the possible early emergence is due to the climate warming; they believe that having a few more warmer weeks could give the cicadas more time to grow to adulthood, therefore triggering them to emerge from underground earlier than normal. What is so unusual about the early emergence of cicadas is that it is not the entire brood emerging early, only a number of individuals from said brood. Cicada expert Keith Clay says “cicada nymphs may be growing to a threshold size so quickly that their internal biological clock is miscalculating when it is time to emerge”. Which could explain why some of the brood are emerging early. By continuing to study these broods of cicadas in the future Chris Simon believes scientists could gain insight as to if these cicadas could survive and produce a new successful brood.
This week in lab we investigated a similar occurrence with temperature changes, blooming time of flowers, and flight time in bees. Specifically we looked at the spider orchid, or Ophrys sphegodes, the orchid that mimics a female bee in both appearance and production of sex pheromones. Male bees are attracted to the pheromones put out by Ophrys sphegodes and then attempt to mate with the flower. While doing so pollen from the orchid is picked up by the male bee and then carried to the other flowers the bee visits. These flowers and male bees both have very short times in which they are at peak fertility. Ophrys sphegodes are only fertile for around a month, and the male bees are only sexually mature for a few weeks before dying. This is why it is crucial that both of these organisms reach peak fertility at the same time. If one misses the other, the orchid may not get pollinated. We looked at data of flowering time in the orchids from 1848-2006 and at data of bee flight time from 1893-2004. By studying the data we were able to see patterns in flowering time and bee flights.


As you can see from the graphs above, at the beginning of the century the bees peak flight times and the orchids flowering time occurred around 75 days after March 1st. By the end of the 20th century and beginning of the 21st century, the average time for both was just above 60 days after March 1st. Why the change in average flowering and flight times? Historically during the same time period, we also saw a warming of the Earth. Since 1659 we see a steady increase in temperature average annual temperature, which would explain why the bees and flowers bloom and fly earlier and would explain that the months after March are warmer than usual.

Despite the fact that there are many more cases and research done to link climate change to problems with both humans and other organisms, a large amount of Americans still don’t see climate change as a problem. According to the study done by Pew Research Center, only about half of Americans agree that climate change is caused by humans. As a science student and someone who tries to keep up with the current events in the news, I have seen people dealing with warmer summers and less cold winters as a result of climate change. Almost everyday on the news you see a report on how temperatures are “record high” for a particular time of year. Each year the Earth is getting hotter and many scientists believe climate change is the cause. Many people (family and friends of mine included) seem to have a hard time believing that climate change is a real issue. A large factor I feel contributes to the general public’s reluctance to “believe” in climate change lies within the current political administration in the United States. President Donald Trump has appointed several people who deny climate change, pulled out of the Paris Agreement, and has gone as far as to call global warming a “hoax”. I can see how someone would believe him; if someone in a position of power denies something that scientists are claiming to be true, some may feel inclined to side with him. I think a way to move past that obstacle would be to have scientists in more higher up positions in government and to have more politicians back scientists doing unbiased research about climate change.
References:
