The dangers and threats of overharvesting to biodiversity

Endemic ducks in Florida, Hawaii, New Zealand and Africa are in danger of extinction because of hybridization with the introduced North American mallard. Poaching and other forms of hunting for profit increase the risk of extinction; the extinction of an apex predator — or, a predator at the top of a food chain — can result in catastrophic consequences for ecosystems.

This has led to the concept of peak water. The solutions to deforestation mostly lie in policy — companies and corporations can adopt best practices and refuse to use timber and paper suppliers that contribute to deforestation.

Also, since kelp forest ecosystems are homes to many other species, the loss of the kelp caused other cascade effects of secondary extinctions. The fishing techniques called bottom trawling and dredging involve dragging huge heavy nets across the ocean floor, picking up everything along the way. More recently, with declining numbers of fish stocks, again due to overexploitation, killer whales have experienced a food shortage and have been observed feeding on sea otters, again reducing their numbers.

Indeed, some are starting to speak about conservation triage as a situation in which not all species can be saved, forcing conservationists to decide which species to protect. Overhunting still poses a big threat to animals in developing regions, particularly primates in Africa.

All this other, non-target catch is called bycatch. Overall, climate is a major factor in the distribution of species across the globe; climate change forces them to adjust.

For example, acid rain, which is typically caused by the burning of fossil fuels, can acidify smaller bodies of water and soil, negatively affecting the species that live there by changing breeding and feeding habits.

Threats to Biodiversity

Human populations, historically, were small, and methods of collection limited to small quantities. With an exponential increase in human population, expanding markets and increasing demand, combined with improved access and techniques for capture, are causing the exploitation of many species beyond sustainable levels.

These shifts are making it difficult or even impossible for many species to survive. Achatinelline snails have 15 species listed as extinct and 24 critically endangered [46] while 60 species of partulidae are considered extinct with 14 listed as critically endangered. Indirect effect Fishing not only has direct effects on target populations but also results in indirect effects such as effect of "goast fishing", trophic cascading effects [7] and food web-competion.

The average person can do a number of things to fight atmospheric and hydrologic pollution, such as recycling, conserving energy at home and using public transportation.

These unwanted things usually get tossed out. Marine ecosystems are of particular interest in this regard. The loss of biodiversity affects the lives of more than 1 billion people living in drylands. In developing countries almost three billion people rely on wood for heating and cooking.

Great Auk — the penguin-like bird of the north, was hunted for its feathers, meat, fat and oil. Conservation and continued awareness surrounding overexploitation, especially poaching and overfishing, are key.

New Zealand mistletoe Trilepidia adamsiiorchids, cacti and many other plant species Shell collectors: Human Population In the yearthere were fewer than 1 billion people on earth, and today there are about 6.

If tropical forest trees are removed and their place is taken by savannah grasses, the evapotranspiration which is so conspicuous a feature of tropical rainforests would be severely curtailed, decreasing rainfall and eliminating the possibility of forest regeneration or even survival of remnants.


In the recent past, the rate and risk associated with alien species introductions have increased significantly because human population growth and human activities altering the environment have escalated rapidly, combined with the higher likelihood of species being spread as a result of increased travel, trade and tourism.

Indirect effects of fishhing include "Ghost fishing" from fishing nets left or lost in the ocean by fishermen. This can particularly apply if, through overexploitation, a habitat loses its apex predator. According to the National Wildlife Federation, solutions include creating systems to prevent introduction of invasive species in the first place, effectively monitoring for new infestations and swiftly eradication newly detected invaders.

Overlogging Clear cutting of old growth forests in Canada. Hybridize with natives, leading to loss of genetic diversity Habitat modification:Invasive species are the second largest threat to biodiversity after habitat loss.

4) Consequences of biodiversity loss

An invasive species is a species that is not native to a particular area, but arrives (usually with human help), establishes a population, and spreads on its own. Overexploitation is one of the main threats to global biodiversity. Other threats include pollution, introduced and invasive species, habitat fragmentation, habitat destruction, [2] uncontrolled hybridization, [32] global warming, [33] ocean acidification [34] and the.

Threats to Wildlife. More than one-third of our nation's wildlife species are at risk of extinction in the coming decades, threatened by a host of human activities. Find out about the major issues currently putting America's treasured wildlife at risk. Read More.

Understanding Conservation. Dec 17,  · Biodiversity is under serious threat as a result of human activities.

Climate Change and Biodiversity

The main dangers worldwide are population growth and resource consumption, climate change and global warming, habitat. May 23,  · Deforestation is a direct cause of extinction and loss of biodiversity.

An estimated 18 million acres of forest are lost each year, due in part to logging and other human practices, destroying the. The core threats to biodiversity include human population growth and the unsustainable removable of resources from the environment. The three greatest proximate threats to biodiversity are habitat loss, overharvesting, and introduction of exotic species.

The dangers and threats of overharvesting to biodiversity
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