Kudzu, also known as Japanese arrowroot, is an invasive plant
species originating from East and Southeast Asia. In its native environment kudzu is a useful plant,
it helps the ecosystem by resisting erosion and increasing nutrient content in
the soil. Kudzu can also be used for
animal feed, its long vines used to weave baskets, and the plant fibers used
for making paper. Kudzu is edible, in
parts of East Asia the roots are ground up and used as starch to make mochi,
and the flowers are also used to make jelly.
Kudzu has also been used in traditional medicine, producing tea from the
roots that contains isoflavones.
However, since the intentional introduction of Kudzu to the
US for the purposes to stop soil erosion in the 1930s, the plant has become an
invasive species. Kudzu vines spread
rapidly and covers the area around them, killing other plants by blocking their
access to the Sun. Since then, the plant
has been found in most areas in the South Eastern US and has been found on the Canadian
shores of Lake Erie in 2009. Kudzu has
also been found in Australia, New Zealand, Italy, and Switzerland.
In order to clear Kudzu completely, the root crown of the
plant has to be removed otherwise the plant can regrow. This can be done by hand or mechanically, or
by using chemical herbicides. An
experimental fungal herbicide also appears to be effective in removing Kudzu
without harming other plants. Although burning
is not advised, repeated consistent harvesting to replete the nutrients is also
effective. Kudzu is invasive in the
wild, but in its natural habitat the plant provides many useful functions for
the ecosystem and for human uses.
Climate change has caused numerous observable impacts on the environment. The increased temperatures have had the greatest effect on areas that are generally cold, such as the tundra biome. In Antarctica, the rate of the loss of ice mass from 1992 to 2006 has increased by 59% in West Antarctica, and increased by 140% in the Antarctic Peninsula (Rignot et al., 2008). General impacts in tundra biomes include the decrease in height and size of deciduous shrubs and graminoids, a decrease in moss and lichen cover, and decreased species diversity. This was caused by a 1-3°C increase in air temperatures, and the effects could be observed after only two years.
These changes in temperatures cannot be attributed to the Earth’s natural climate fluctuations alone. Climate change has been primary caused by humans releasing large amounts of carbon dioxide into the atmosphere which trap more heat from the Sun, raising temperatures through a process called the greenhouse effect. Other anthropomorphic impacts that have also contributed to climate change include pollution, urban expansion into natural areas, poor management practices, and rapid increases in human populations.
If temperatures continue to rise, irreversible damage will be
done to various ecosystems around the world. Many species will be forced
to relocate to more suitable conditions or face the risk of extinction, and
biomes such as the tundra will lose more of their biodiversity.
Pollen grains are produced by seed
bearing plants: angiosperms and
gymnosperms. They are microgametophytes
that contain the genetic material of male plants from the sporophyte
generation. The pollen grains are
encased in two layers; the extine is the outer later and is composed of sporopollenin,
a complex polymer, and the inner layer called the intine. The walls of the pollen grain protect it from
drying out and are able to resist chemical degradation so the pollen can
successfully be transported to the stigma of female plants. Pollination can be mediated by animal
pollinators which include bees, ants, butterflies, beetles, hummingbirds, and
other small vertebrates; pollination can also be conducted by abiotic factors
such as wind or water.
Pollen identification allows the
reconstruction of past plant abundances from pollen fossils due to their
resilience. In addition, identification
of pollen on their animal pollinators could help ecologists determine the
distribution and dispersal ability of the plant species. Furthermore, identifying pollen would be
helpful to those with pollen allergies. Pollen
can be indentified in labs by using safranin to dye the pollen, followed with
The pollen lab in BIOL2010 was interesting but very tedious. It was very difficult to see the pores and furrows on the outer layer of the pollen grains under the microscope. It would often be hard to distinguish the features described on the guide, and identification would eventually devolve into a guessing game rather than a scientific method. The material on the pollen lab ended up not being on the lab exam, so in the end the whole thing felt somewhat useless. It ended up being memorable, however.
Majority of the ecological restoration projects surrounding plant communities are the result of developers involved with the development project hoping to retain or revive some of the biodiversity that has been lost to develop the land. There are major factors in play here, with many people hoping for varying outcomes. This is where policy and politics influence our restoration efforts. Politics influences the many policy makers who control what we can and can’t do when it comes to restoration or conversation. Unfortunately, most of the time it comes down to which parties can pitch their plan for “the greater good,” and this often leaves little room for conservation or restoration as there is not money to be made with such projects.
Now there are many organizations all focused with the same general goal; to build stronger relationships between scientists, policy makers and practitioners, but we are only interested in such organizations regarding conservation or restoration in this case. To paint a better picture and emphasize the effects policies and politics have on the scientific community let me briefly go over the process of development planning. To being with we can establish that the development goal or project will have to be on a conservation or restoration biological level. However, this is still quite ambiguous. While the scientists may want to place a park as a refuge for birds, the investors may believe canopy coverage is not needed and would prefer the planting of other exotic or rare/endangered plant species. As they are both stakeholders within this project the final plan must meet the intentions of many while keeping the others happy and benefit the environment overall. With different intention different metrics are needed to evaluate progress, and progress is defined differently for each person. The planning may prove to be the most difficult part of any restoration or conservation effort as the politics of the parties involved and how they interact need to be decided beforehand, and the final plan must include courses of action to take should unexpected outcomes occur. Hopefully thinking about the thought needed to develop such a project helps you imagine why policy and politics have such a tremendous effect on the scientific community.
Pitt R, Wyborn C, Page G, Hutton J, Sawmy MV, Ryan M, Gallagher L. 2018. Wrestling with the complexity of evaluation for organizations at the boundary of science , policy , and practice. 32(5):998–1006. doi:10.1111/cobi.13118.
So, what is restoration ecology? When breaking the two words
down, restoration means to return something to its former condition after
degradation or destruction and ecology is a science that looks at the relationship
of organisms and their surroundings. Essentially, ecological restoration tries
to fix an ecosystem or help a species that has been bothered. It is about
finding a good balance between nature and culture. Revegetation is a good
example of ecological restoration. Revegetation is fixing and rebuilding the
soil of land that has been disturbed. With revegetation, this affects how
plants will grow and their ecosystem. Good
soil is very important for healthy plants.
A good solution to restoration ecology is ecological landscaping. Ecological landscaping isn’t about planting what is pretty or on trend, but instead thinking about what an ecosystem needs and while caring for other plants, animals, land, and water. It is basically just planting smart. There are many benefits to ecological landscaping such as improving air, water and soil quality, improving human, plant, and animal species health, creates diversity within the ecosystem, etc. I never thought about such things when looking at my garden in my front lawn, but after doing some research I think it is very important to become conscious to the fact that small changes can have big impacts.
By the title, you might be wondering, what did we do now? Yes,
we are at fault again, but there is an easy solution to this problem. The
problem being that habitats that are unmanaged have an agricultural impact. So,
solving this problem would also benefit us, so why not just fix it? Unmanaged habitats
mean less opportunity for new species growth and often times the species left unmanaged
are weeds, which are invasive species.
So, how does this affect plant life? For example, when looking at hedgerows, they provide habitats for different species, used for livestock retention, etc. and are often not maintained. When the hedges remain not looked after because farmers care more about their arable land, this causes a problem to other plant species around because when herbicides were used to control weeds at the bottom of hedges, there is such thing as accidental spray drift. Spray drift is when surrounding plants are affected by the herbicides that did not come in direct contact with the hedges. This will affect the arable land that is very close to the hedges. So, would it be better if we just let the hedges grow? Yes, the hedges are beneficial to many species and after doing further research it seems that it would be more beneficial if we left the hedges unmanaged.
When we think of invasive species, we normally characterize them as dreadful, unwanted pests capable of massive destruction to biodiversity, economy, and ecosystem processes. However, most introduced non-natives have low chances of survival and reproduction due to processes such as propagule pressure, predation, and lack of desirable traits. Even when successful, invasive species may have no or minimal impact, or in some cases, potential benefits. For example, purple loosestrife can act as a ‘pollinator magnet’ for a native co-flowering species, as its presence increases visitors to areas with only loosestrife, only native, and both (Groulx and Sargent 2018).
Opuntia spp. are another ‘invader’ with benefits. This cactus, also known as prickly pear, was acknowledged by Alexander von Humboldt in his book Views of Nature for its spread into northern Africa, the Middle East, and southern Europe, from the Americas, which they are native to. Some species have been cultivated and used for food consumption by humans. Furthermore, they are useful for preventing soil erosion in the Mediterranean and helping the establishment of native plants in similar dry regions. The success of this species is attributed to its efficient use of water and creating fertile, less sandy microhabitats, which is good for native species (Houerou 1996). The cacti also provide animals with much-needed shelter from the hostile desert environment.
A study by Neffar et al. (2013) studied the effect of Opuntia fiscus-indica plantation age (control, 5, and 20 years) and some soil properties on native plant community in northeast Algeria. Two-way ANOVA testing revealed significant variation for plant abundance and vegetation cover in native plants, where vegetation cover differed significantly with both age and seasons. More importantly, vegetation traits were significantly higher in Opuntia plots than control plots. Vegetation cover was higher for Opuntia plots as opposed to control plots in all seasons, and abundance and species richness for Opuntia plots were also higher than control plots, with old (>20 years) plots yielding the most benefits. The authors came to the conclusion Opuntia fiscus-indica encourages the colonization and development of herbaceous species and hypothesized this is possible due to Opuntia enhancing the intense conditions faced by these plants.
This plant is a prime example of an invasive species that is not only a valuable crop for human consumption but also a phenomenal plant in arid and semi-arid lands for soil conservation and restoration, as well as the health of native species. Our nihilistic attitude towards invasive species should probably be reassessed into a more fair attitude that treats them based on their actual value instead of preconception.
Groulx AF, Sargent RD. Purple Loosestrife Provides Long-Distance Pollinator Attraction to a Coflowering Native Species. International Journal of Plant Sciences. 2018;179(8):593–602. doi:10.1086/699739
Houérou HNL. The role of cacti (Opuntiaspp.) in erosion control, land reclamation, rehabilitation and agricultural development in the Mediterranean Basin. Journal of Arid Environments. 1996;33(2):135–159. doi:10.1006/jare.1996.0053
Neffar S, Chenchouni H, Beddiar A, Redjel N. Rehabilitation of Degraded Rangeland in Drylands by Prickly Pear (Opuntia ficus-indica L.) Plantations: Effect on Soil and Spontaneous Vegetation. Ecologia Balkanica. 2013;5(2):63–76.