overexploitationterrestrialanimals-資料下載頁
2025-10-15 17:21本頁面
【導讀】reproduce.forresources.andlizards.agriculturalland.ecosystemservices.
【正文】 eyeopening percent over the past few decades, from an estimated 1 billion in the mid1990s to just 35 million in early 2020. Monarch butterflies face numerous threats along their migration route between the . and central Mexico, but their decline is a result of one primary factor: the similar decline in milkweed. Monarchs depend on milkweed, it’s the only plant they eat, and they lay their eggs on milkweed leaves during the summer breeding season. The vast majority of that milkweed loss, overlapped with prime monarch breeding areas. Milkweed decline is caused by farmers who view this plant as a weed and wipe it out from their fields using herbicides. Other factors such as and weather and climate also affect survival of butterflies. Ecological impact: Many flowering plants are so closely linked to butterflies (and vice versa) that one cannot survive without the other. They are also used to teach children about metamorphosis, migration, aposematic coloration, and mimicry. Economical impact: Butterfly nesting sites in Mexico are huge tourist sites, bringing in a lot of revenue. Needless to say, butterfly loss would heavily impact the economy. Research/focus: According to the . Fish and Wildlife Service (FWS) agency, monarch butterflies may deserve protection under the Endangered Species Act. The agency is providing $2 million for on the ground conservation projects. As part of an agreement, the federation will help raise awareness about the need for milkweed, provide seeds to anyone willing to plant it and to plant the seeds in open space such as roadsides, parks, forests and patio flower boxes. Works Cited ? Hoefnagels, 1st ed. Biology: The Essentials. McGrawHill Higher Education. Chapter , , ? followingextinctionthe ? ? ?src=footer ? ? ? ? Works Cited Cont’d ? ? de_but_still_on_the_rise/ ? poaching/ ? ? ? ? ? ? problem/ ? ? butterfliesendangered/ ? massacrenearlyabillionbutterflieshavevanished/ ? ?
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