A Specie's Vulnerability to Population Decline

Policy makers and policy makers are insisting on information on the cause of the decline in the population that caused species extinction (). However, it is pointed out that the cause of this vulnerability remains unclear to explain the change in the dangers of extinction (). According to Reynolds (2003), vulnerability is determined by a decrease in the number of species and a decrease in the geographical range. These two forms of vulnerability are caused by random mortality and habitat loss which are the cause of random factors that may determine their own biological properties, anthropogenic influences from the outside and trends of the population It is affected by.

When the species population decreases by 30% to 50%, that species is classified as a vulnerable species. This decrease is measured in either 10 generations or 3 generations, whichever is longer. The first generation is the period of time from when animals are born until they can breed. When they are about one month old, the mouse can breed. The mouse population was chased mainly for 10 years. The elephant generation lasted about 15 years. Therefore, elephant populations have been measured for over 45 years.

If one species is a better competitor than the other then the population of less competitive species may decrease. Sometimes the total population of species may be eliminated from the habitat where it was first discovered. This is called deletion. As species decrease worldwide or regionally, that species is in danger of extinction and is in danger of extinction.

Two years ago, the highest animal in the world was classified as a fragile animal after its number dramatically decreased. The International Conservation Union for Nature (IUCN), which manages the list of the most endangered species in the world, has moved from the most unfocused species to the endangered species list. The Trump regime relaxed the restrictions on imports of wild animals killed by hunters and introduced what is called "the golden age of the trophy hunter". According to a document obtained by an animal protection group, an animal protection group, the government issues more than 30 permits to take Lions trophies back to the United States and Hunter donates a special permission to the Republican Party.

Lions are not necessarily on the verge of extinction. The International Conservation Union for Nature Conservation (IUCN) Red List ranks as a vulnerable group, one step higher than the classifications at risk of the Lions. However, it was pointed out that the number of lion populations has declined with an estimated 43% decrease between 1993 and 2014.

In the past two decades, the number of many penguin species has drastically decreased. According to the 1996 International Conservation Union's Red List, five species are threatened. In 2013, 11 species (60%) are classified as endangered species (5 endangered species, 6 fragile species), 2 species are close to endangered species, 5 species are attracting the most attention There was no (Table 1). In general, seabirds are the most threatened bird population (Croxall et al., 2012), penguins are the most threatened seabird since Diomedeidae.