Chapter 2 : REASONS FOR ENDANGERMENT

 Species become endangered for two main reasons: loss of habitat and loss of genetic variation. 

Let us take a look at them.

1. Loss of Habitat 

Loss of habitat can happen both naturally and influenced by human activities. 

Development for housing, industry, and agriculture reduces the habitat of native organisms. This can happen in a number of different ways.

Development can eliminate habitat and native species directly. In the Amazon rain forest of South America, developers have cleared hundreds of thousands of acres. To “clear” a piece of land is to remove all trees and vegetation from it. The Amazon rain forest is cleared for cattle ranches, logging, and urban use.

Development can also endanger species indirectly. Some species, such as fig trees of the rain forest, may provide habitat for other species. As trees are destroyed, species that depend on that tree habitat may also become endangered. Tree crowns provide habitat in the canopy, or top layer, of a rainforest. Plants such as vines, fungi such as mushrooms, and insects such as butterflies live in the rain forest canopy. So do hundreds of species of tropical birds and mammals such as monkeys. As trees are cut down, this habitat is lost. Species have less room to live and reproduce.

Loss of habitat may happen as development takes place in a species range. Many animals have a range of hundreds of square kilometers. 

Loss of habitat can also lead to increased encounters between wild species and people. As development brings people deeper into a species range, they may have more exposure to wild species. Poisonous plants and fungi may grow closer to homes and schools. Wild animals are also spotted more frequently. These animals are simply patrolling their range, but interaction with people can be deadly. Polar bears, mountain lions, and alligators are all predators brought into close contact with people as they lose their habitat to homes, farms, and businesses. As people kill these wild animals, through pesticides, accidents such as collisions with cars, or hunting, native species may become endangered.

Environmental factors can also contribute to habitat destruction more indirectly. Geological processes, climate change, introduction of invasive species, ecosystem nutrient depletion, water and noise pollution are some examples. 

2. Loss of Genetic Variation

Genetic variation is the diversity found within a species. Genetic variation allows species to adapt to changes in the environment. Usually, the greater the population of a species, the greater its genetic variation.

Inbreeding is reproduction with close family members. Groups of species that have a tendency to inbreed usually have little genetic variation, because no new genetic information is introduced to the group. Disease is much more common, and much more deadly, among inbred groups. Inbred species do not have the genetic variation to develop resistance to the disease. For this reason, fewer offspring of inbred groups survive to maturity.

Loss of genetic variation can occur naturally. For example Cheetahs cannot adapt to changes in the environment as quickly as other animals, and fewer cheetahs survive to maturity. Cheetahs are also much more difficult to breed in captivity than other big cats, such as lions.

Human activity can also lead to a loss of genetic variation. Overhunting and overfishing have reduced the populations of many animals. Reduced population means there are fewer breeding pairs. A breeding pair is made up of two mature members of the species that are not closely related and can produce healthy offspring. With fewer breeding pairs, genetic variation shrinks.

Monoculture, the agricultural method of growing a single crop, can also reduce genetic variation. Modern agribusiness relies on monocultures. 

Let us take a look at the reasons for endangerment shared by our Instagram family:

@aisha_bagha - 

"Invasion of their natural habitat by humans" 

@_nussy.nus_ -

"Degradation & loss of habitat mainly caused by deforestation, natural disasters due to climate change, human over-exploitation of species e.g. hunting & overfishing, pollution and spread of diseases."

@zainab_akadir -

"Degradation of natural habitat like deforestation. Hunting too" 

@_real_rizwana -

"People and their greed"

@souqbazaars -

"Lack of knowledge"

@rewireyourmindsetstrategy -

"Ignorance"

@leafypaths_freya -

"Human corruption"

REFERENCES:

www.natioanalgeoghraphic.org

Chapter 1 : ENDANGERED SPECIES

Endangered species is a term used for species considered to be facing a very high risk of extinction in the wild. 

Species become endangered for two main reasons: loss of habitat and loss of genetic variation. We'll take a look at these reason further in our next article. For now take a look at this list of endangered species as at 2022. Does your favorite animal fall into it? 

According to Earth.Org here are the 10 most endangered species by end 2022: 

1. Amur Leopard 

Between 2014 and 2015, there were only around 92 individuals left in their natural range. This number is now estimated to be around 84. They are extremely vulnerable to poachers, who kill them for their coats and bones, the latter of which is sold for use in traditional Asian medicine. They are at risk of habitat loss due to natural and man-made fires. Climate change is also leading to a decrease in prey availability. 

2. Rhino

Rhinos are one of the most poached animals on the planet. Their horns are used in traditional Chinese medicine and displayed as a symbol and demonstration of wealth. Because of poaching, three of the five species of rhinos are among the most endangered animals in 2022: the black rhino, the Javan rhino and the Sumatran rhino. The Javan rhino is the closest to extinction with only around 60 individuals left, all of which are in Ujung Kulon National Park in Indonesia, while black rhino population is estimated to be around 5,500 individuals. 

3. Orangutan

The two kinds of orangutan – the Bornean and the Sumatran Orangutan – have both experienced sharp declines in populations. A century ago there were probably more than 230,000 orangutans in total, but the Bornean orangutan is now estimated at about 104,700 based on updated geographic range and the Sumatran about 13,846. They are primarily threatened by habitat loss from human-caused deforestation for palm oil. 

4. Gorilla

There are two species of gorillas, the Eastern gorilla and the Western gorilla, which both have two subspecies. Three out of four are Critically Endangered. The only one that isn’t is the Mountain Gorilla, a subspecies of the Eastern Gorilla, which is considered Endangered. Like many endangered animals, their decline is mostly due to poaching, habitat loss, disease and human conflict. 

5. Saola

Often called the Asian unicorn, the saola is one of the rarest mammals on the planet and for this reason, it makes the list of the world’s most endangered animals in 2022.

6. Vaquita 

Both the smallest and most endangered marine mammal in the world. Their biggest threat is from the illegal fishing of totoaba, a large fish in demand because of its swim bladder. Vaquitas accidentally end up entangled in the gillnets set for totoaba and drown because they can no longer swim to the surface to breathe. 

7. Sunda Tiger

Of all the big cats, tigers are the closest to extinction. with fewer than 3,900 tigers remaining in the wild, they exist in only 4% of their historic range. Sunda tigers in particular are especially vulnerable. Despite increased efforts in tiger conservation – including strengthening law enforcement and anti poaching capacity – a substantial market remains in Sumatra and other parts of Asia for tiger parts and products. 

8. Yangtze Finless Porpoise 

Finless porpoises live in the Yangtze River in China. Unfortunately, they are vulnerable to fishing; even though they are not directly targeted by fishermen, large numbers of the species die when they become accidentally entangled in fishing gear. The waters they live in are also constantly busy with fishermen and people using the waterways to move around, so they get injured and killed by boats and ships. Additionally, their waters are also affected by high levels of toxic pollutants.

9 Turtle

Hunting is one of the biggest threats to sea turtles, with poachers targeting their eggs, shells, meat and skin. They are also at risk from habitat loss, bycatch and pollution as well as climate change. Sand temperature determines the sex of hatchlings with eggs developing as females in warmer temperatures. That means even small temperature changes could skew the sex ratio of populations. 

10. Elephant 

Last on the list of the world’s most endangered animals in 2022 are elephants. While some populations of African elephants are increasing, primarily in southern Africa, numbers are continuing to fall in other areas, particularly in central Africa and parts of East Africa. With an estimated 415,000 elephants left on the continent, the species is regarded as vulnerable, although certain populations are being poached towards extinction. 

Thank you to our Instagram Family for sharing a list of animals according to them are facing endangerment. Let us try our best to raise awareness, share information and help save the animals. 

Rhino (zainab_akadir) (@dafina_bread)

Mountain Gorillas & Thompsons Gazelle in Kenya (aisha_bagha)

Giant Panda (hopeful.living.ngo)

Horses & Lions (_real_rizwana)

White Tigers (@leafypaths_freya)

REFERENCES

www.earth.org