A CLOSER LOOK AT NATURE’ S MINIATURE RAINFORESTS By Assistant Naturalist Hannah Mossbarger
A CLOSER LOOK AT NATURE’ S MINIATURE RAINFORESTS By Assistant Naturalist Hannah Mossbarger
You may have noticed or even stopped to feel the lush, green, spongy patches growing on rocks or the bark of trees in shady spots along a trail while you were hiking. You may also have been able to identify these patches as moss, but these miniature ecosystem carpets contain environmental relevance and surprising complexity far beyond what meets the eye. What makes mosses so unique and why do they merit our attention?
Mosses are classified as bryophytes along with liverworts and hornworts. These plants have their own category because unlike most plants that obtain nutrients from root systems and rely on specialized tissues called xylem and phloem to transport nutrients throughout the plant, bryophytes possess the ability to absorb nutrients through the air. This is also the reason why they are able to flourish in places where most plants would not be able to grow in the first place, such as the surface of rocks and in extreme climates like the arctic tundra or the harsh heat of the Mojave Desert. As a colonizer species, mosses are some of the first to establish themselves on landscapes that have been destroyed by wildfires or other natural disasters.
Because they lack the roots and specialized tissue that characterizes the majority of plants, they have a high dehydration tolerance and can directly absorb moisture into their cells. One desert species, Syntrichia caninervis can survive years of dehydration and is able to rehydrate within seconds of receiving water. This vigorous species has even been noted as a potential plant for future space colonization due to its ability to survive Mars-like conditions within a specialized lab setting that mimicked Mars’ environment.
The“ spongy” texture of mosses and their tendency to absorb nutrients from the surrounding air is a testament to their ability to act as significant bioindicators of heavy metals within the environment. Additionally, mosses are frequently used to detect harmful air pollutants such as cadmium which is released into the environment from fossil fuel combustion and through Phosphorous fertilizers. Mosses have even been found to capture airborne microplastics that can negatively affect human health through endocrine disruption and result in detrimental bioaccumulation within natural ecosystems. In Bulgaria, moss walls are utilized in urban settings to accumulate toxic elements and to assess air quality. Because of their sponginess, mosses also play a role in retaining humidity from fog and can help to prevent soil erosion.
Though they may appear unassuming, mosses present a fantastic habitat for many microscopic organisms and a closer look reveals a thriving community of ecological characters. Invertebrates such as nematodes, rotifers, and tardigrades are abundant in aquatic mosses, while mites and springtails live on terrestrial mosses. Surprisingly, moss is a home to producers, consumers, decomposers, and other microfauna that also attracts small mammals that increase biodiversity within a given ecosystem.
These impressive plants play a role in establishing ecosystems not only as bioindicators, but also for the microorganisms that inhabit their flourishing tiny leaf-like structures called“ phyllids”. Their need for humidity and ability to absorb so much water enables them to trap moisture in a way that protects the soil from erosion because they bind with the soil to create a sturdy and stable layer that is resistant to runoff. Although many of the microbes who benefit from mosses can only be seen on a microscopic level, the environmental contribution of these specialized plants is on a much larger scale that puts a deeper lens on our understanding and appreciation of bryophytes beyond their vibrancy and beauty within a landscape.
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