Winter is called the ‘quiet season’. The air turns colder, mornings are quieter, and most of the time in the world, the leaves have fallen and the days are less vibrant. For humans, winter might be all about being colder, having a warm jumper on, a hot drink in our hand and shorter days. But for wildlife and its ecosystems, it’s so much more than that.
The effect of each season can be seen in nature and winter helps support seasonal diversity. Plants grow more slowly, animals exhibit different behaviour, migratory birds travel to warmer climates and food sources vary across habitats. Many animals go into a state of torpor to reduce energy requirements, some adapt physically and behaviorally to the winter conditions. Everything still continues whilst the landscape remains still.
Winter is a reminder that biodiversity is a dynamic phenomenon. Seasonal, ever-changing, and always the same rhythm: where every living organism has its place.
Changes in Animal Behaviour
The obvious signs of winter are always going to be noticeable but one that tends to change the most is the behaviour of animals. Animals will slow down to conserve energy as temperatures drop, causing food shortages and to survive, demand more energy.
Some animals hibernate or another way to call it is ‘winter dormancy’. During this time their body processes slow down so they can last a long time with very little energy. Examples are some mammals such as bats, rodents and other small animals – these animals go into their own (sometimes involuntary) form of dormancy in order to weather out the winter rather than wasting valuable energy in trying to find food during cold weather.
Animals that do not hibernate alter their daily activities: they may be more active during warmer hours of the day and seek shelter when temperatures are cooler. Others even approach areas where there is more food (such as around human settlements).
Predators suffer too. When the predators’ prey is less active or less common, they have to travel further to find prey or they have to change prey species. This causes short-term fluctuations between the predator and prey populations.
So, what seems to be a decreased activity is actually a fine-tuned survival tactic.
Migration: Nature’s Winter Journey
Perhaps the best-known instance of this adaptation is migration. With the coming of winter, many species begin to migrate from one region to another.
Migration, especially that of birds, is of course the most interesting. For example, birds could travel hundreds or thousands of kilometres to find food and habitats that offer warmth, and some may use the same paths for several generations.
India is also turning out to be one of the wintering grounds for many of the migrating birds. Birds, these areas offer food and shelter to the birds that are migrating from the winter regions of colder areas. Their arrival is an extra flavor for the seasonal animals of the nation.
Migration is not just a byproduct of cold weather; it’s a sophisticated, multifaceted response to fluctuating temperature, nutrition, light and breeding conditions. Because migratory animals depend on more than one habitat throughout their lives, they serve as a link between habitats.
But these habitats are often under threat of destruction, which makes it harder for migration to be possible. Wetlands, along with other habitats, are subject to degradation from pollution, human activity, and climate change, which may impact food and habitat sources throughout migration routes. Critical habitats must be maintained not only for the birds that breed there but also for those that migrate through.
Winter and Plant Life
Winter has a profound influence on plants too. Many deciduous plants lose their foliage in winter and often even before winter arrives. This is not a sign of the plant dying but an adaptation for survival.
Reasons for leaf loss Leaves need water and energy to keep them. When it’s cold and water is frozen or cannot be absorbed, maintaining leaves can be costly. In order to spend less water and save energy, a tree might shed its leaves.
Many plants take a break. Growth slows, and the plant stores energy in roots, stems, bulbs, or other structures. When the sun shines longer and the weather warms up, the plant resumes growth.
Certain plants are adapted to thrive in cold conditions. Thick bark, protection from buds and small-sized leaves are some of the features that enable them to withstand low temperatures. Evergreens, for instance, preserve their leaves and are active in winter as well as summer, so they are adapted to cooler temperatures.
Finally, winter can affect seed production and flowering. Some plants need a certain amount of cold before they can flower or seeds can germinate. This just illustrates that winter is not an impediment to plant life. On the contrary, many species need it to enable their reproduction.
Effects on Food Chains
The entire food chain can be affected if a species is influenced by a winter. An ecosystem has interconnected organisms.
For example, insect populations may decrease when it is cold. If insects are less available, birds and other insects-eating creatures may not have enough to eat. If plants have fewer leaves, fruits, or seeds for feeding from herbivores, predators relying on those herbivores can also be impacted.
However, these seasonal variations are not always damaging; most ecosystems have adapted to the variations. Animals have evolved ways to cope when the nutrients are limited, and plants have evolved strategies to conserve energy.
The problem gets worse when seasonal changes occur more rapidly or are less predictable. Wildlife rely heavily on timing. If the availability of food changes, an animal may not be in the right place at the right time to exploit it. This can upset long-standing interactions between species.
So winter reminds us how all pieces of an ecosystem are so interdependent.
Winter and Ecosystem Processes
Winter impacts far more than the plant and animal life we can readily observe. There are also significant, often unnoticed, effects on water and soil.
An example is decay. Organisms and decomposers turn dead things, like leaves and plants, into other things that help the soil in the form of broken-down bits. Many decomposers are less active when the weather is cold, so most decomposition is slower during winter.
As temperatures warm up again decomposers break down and nutrients are released back into the soil. These nutrients will help new plant growth and make the ecosystem more productive.
Water is affected by winter as well. Lakes and ponds in very cold areas often develop a snow and ice covering. What’s fascinating is that the ice actually insulates the waters below allowing life to go on under the ice covering. Plants and animals under the ice may live even if the surface temperatures are very low.
These processes only confirm that an ecosystem doesn’t cease to be functional once winter arrives. It just changes its way of functioning depending on the circumstances.
Winter, Reproduction, and Life Cycles
Reproduction and Life Cycles – Winter may have also affected the way life is organized around the world. For many organisms, winter is the start of a time of rest before they begin to reproduce. For others, winter is a cue that guides when this will happen.
The presence of food and good shelter may have an effect on whether animals can have offspring. Birds may aim to arrive in their breeding grounds when food is plentiful. Plants may aim to flower at a certain temperature or when there is enough light.
Timing this seasonally is critical. Many species rely on each other to occur at the right time. A plant can only be successfully pollinated if it flowers while its pollinator are flying around, and young animals can only survive if they are born when they have the best chance of finding food.
Consequently winter is only one element of an extended cyclical process which ready the landscape for subsequent change.
Climate Change and Changing Winters
Another big threat facing seasonal biodiversity now is climate change. Winter conditions and temperatures are starting to be different in many parts of the world. Winters could be warmer, shorter or more variable.
For wildlife, there can be impacts even for modest changes in the seasons. Migratory birds may arrive later or earlier. Plants may bloom earlier. Animals may alter the timing of hibernation or mating or emerging from winter dormancy.
It’s not necessarily a case of just a warm winter. What really matters is different species will be affected by change at varying times.
For instance, a plant may flower earlier due to higher temperatures, but the pollination insects may not adjust to a similar extent. This could lead to a mismatch between mutualists.
Migratory Animals Changes in rainfall, temperature, water levels and vegetation can lead to habitat loss of migratory animals’ traditional wintering grounds.
The world has and continues to change and so do the species. But fast changes are also creating pressures on species that are already under the stress of habitat loss, pollution, and human impact.
Protecting Winter Biodiversity
To safeguard winter wildlife, there is a need to preserve the habitat on which it relies. That habitat can be found in forests, wetlands, lakes, grasslands, mountains and along coasts.
Wetlands are critical as they are a food and shelter source for a large number of migratory waterfowl. Forests offer shelter and food sources for animals in the winter months. Good quality rivers and lakes support aquatic animals and provide drinking water for land animals.
Humans can also make a difference through very simple things. Reduce pollution, don’t pollute, nurture native flora and fauna, save water and be kind to all animals and their habitats.
Unnecessary access to animals during sensitive times should also be avoided. Wildlife require areas to rest, forage, migrate and breed without disturbance.
Conservation is not about holding back nature, it’s a natural process that takes place with or without humans. Seasonal change is vital and necessary, however, the need to ensure that our ecosystems are resilient enough to carry on doing it.
Conclusion
The Winter Landscape While it might seem that winter is a time of dormancy, not to be deceived: Underneath the stillness, there is much life and activity. Animals migrate and hibernate, forage for food and burn energy. Plants protect themselves from the cold and go dormant, and desert and forest organisms remain in a state of rest while the Food Chain is adapted to changing temperatures. All of these are a part of seasonal biodiversity.
There are ways to stay alive in winter that don’t seem very exciting. Sometimes staying alive involves a road trip of thousands of kilometres. Sometimes it’s a matter of sprouting a fur coat. Sometimes it’s a matter of laying low in a burrow, or of taking things slow and waiting for spring.
And they show us that altering winter disrupts delicate seasonal rhythms within ecosystems. As winter changes accelerate and temperatures shift, other impacts can ripple through communities, beyond a single species. They can alter migration patterns, flowering, reproduction, food resources and entire food webs.
Maybe that’s exactly why it’s worth looking at this season as well. Maybe winter is not just the dull and cold between the autumn and the spring. Maybe it is, somehow, one chapter in the life’s book.
Winter quietness is often deceptive. Consider that under leafless trees and still scenery, nature is in movement, in conservation, moving, and working its way through. Winter is not nature on hold-it’s nature reconfigured. Because it is not only the abundance and colours of nature that are to be celebrated; it is the gentle transformation, the resilience and the renewal.
By: Hanishree Vichare
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