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  1. Redt de vleermuis, koop geen guano, er zijn genoeg alternatieven. Kwetsbare ecosystemen worden ernstig bedreigd. The Garden Professors: One of the fertilizers I have the most trouble recommending is bat guano. The problem is that the stuff works, but it may well come from places, mostly offshore, where it is harvested nonsustainably, ruining local ecosystems. Sure, bat guano can be harvested sustainably -- I know it occurs in Texas, for example, where there are tight restrictions on guano harvesting. My question is, why don't companies that produce fertilizers with sustainably harvested guano advertise this fact? Don't they think it's important enough? (We are university professors dedicated to translating scientific information for your gardens and landscape) Onderzoek op Jamaica heeft aangetoond dat de vleermuizenpopulatie ernstig te lijden heeft van het winnen van guano uit de grotten waar de vleermuizen slapen. En ook het ecosysteem er om heen ernstig wordt aangetast. http://youtu.be/2bkPdbMnqog In andere (2e en 3e wereld) landen waar guano wordt gewonnen is dit niet anders. In Indonesie worden gebakken vleermuizen als snack gezien, daar liggen ze dus dubbel onder vuur. En dreigen enige soorten nu uit te sterven. Ook aan het gebruik van guano van zeevogels kleven nadelen. de Afrikaanse pinguin legt zijn eieren in een laag guano, en op sommige eilanden in zijn leefgebied is de laag guano tot op de rotsen toe weggeschraapt. Het nut van de vleermuis: Bats have long been postulated to play important ecological roles in prey and predator, arthropod suppression, seed dispersal, pollination, material and nutrient distribution, and recycle Bat pollination occurs in more than 528 species of 67 families and 28 orders of angiosperms worldwide. Pteropodid bats are known to pollinate flowers of about 168 species of 100 genera and 41 families and phyllostomid bats pollinate flowers of about 360 species of 159 genera and 44 families Bat populations appear to be declining presumably in response to human induced environmental stresses like habitat destruction and fragmentation, disturbance to caves, depletion of food resources, overhunting for bush meat and persecution, increased use of pesticides, infectious disease, and wind energy turbine. As bats are among the most overlooked in spite of their economical and ecological importance, their conservation is mandatory. De situatie op de filipijnen: By 1970, the last lowland forest on Negros had been invaded and destroyed, eliminating most of the food source near the caves. At the same time, workers removed guano from the caves, disturbing the bats' reproduction, and often killing these largest of the local cave bats to supplement their primary diet of rice and corn. The few specimens taken for museums came from the last period of stability, just before the final phase of deforestation and guano mining. Ontbossing: Deforestation and the loss of associated roosting and foraging habitat is a major threat to Asian bats, as some countries have lost more than 80% of their primary forest cover due to over-exploitation of timber and land conversion for agriculture. Destruction and disturbance of cave roosts is another major problem, with guano mining, swiftlet nest collection, irresponsible ecotourism, and bushmeat hunting motivating people to enter caves and damage prime subterranean habitat. Crews load tons of guano into sacks like these for sale as a primary material in fertilizers. Unregulated guano harvesting from caves can have extremely negative impacts on roost sites, even causing entire bat colonies to abandon caves where they may have roosted for hundreds of years.
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