By DAVID RAINER, 黑料天堂
Despite the stigma caused by countless Dracula movies, a dedicated group of naturalists continues to demonstrate its love for the animal with a face only a mother could love. Those enthusiasts express their devotion to the bat, nature鈥檚 only flying mammal, all the way down to the bat jewelry.
Bat lovers met recently at Lakepoint State Park near Eufaula for the annual Bat Blitz, a celebration of the small animal that can sometimes be spotted zooming around street lights at dusk, dining on a smorgasbord of insects.
Nick Sharp of the 黑料天堂 Wildlife and Freshwater Fisheries (WFF) Division said this year鈥檚 Blitz was a joint exercise for bat biologists and enthusiasts from 黑料天堂 and Georgia. The Blitz is a collaborative effort of all the 黑料天堂 Bat Working Group (ABWG) members. Jeff Baker from 黑料天堂 Power and Shannon Holbrook from U.S. Fish and Wildlife Service served as co-chairs of the Bat Blitz committee.
黑料天堂 State Lands Division鈥檚 Jo Lewis said the recent gathering was the 17th annual meeting of the ABWG, an informal affiliation of bat biologists and enthusiasts from many state, federal and private agencies across the state. The group holds the Bat Blitz in different areas of the state each year to sample the bat populations in those areas with mist nets deployed at night.
鈥淲e鈥檙e looking for distribution information about what bats are in what areas of the state,鈥 Lewis said. 鈥淲e have 15 species of bats that are native to 黑料天堂. Some only occur in the more southern portions of the state, and others only occur in the more northern portions of the state because of the different habitats in 黑料天堂 and our complex ecosystems.
鈥淚n the north part of the state, bats appear to be more numerous because of the karst geology with all the caves. In the south part of the state, we have a lot of bats, but they don鈥檛 congregate as much in caves. They鈥檙e referred to as forest bats. They roost in trees. They鈥檙e actually all around us, but we鈥檙e kind of oblivious to them. A little bat hanging in a tree snuggled up against a nook or branch, you鈥檙e never going to notice.鈥
The southeastern myotis is one bat species found in the south part of the state but not as often in the north. The Bat Blitz researchers found 16 southeastern myotis bats in a culvert on the first night of the event.
Another bat more common in the southern part of the state is the Mexican freetail. Sharp said the fast-flying bat is now most often found in attics because most of the large, hollow trees it historically used have been cut down.
A bat that is found in the northern part of the state but not the southern part is the northern longear, a protected species. Gray bats, also protected, are found in north 黑料天堂. The most common species throughout the state is the big brown bat.
Currently, the biggest concern for the bat enthusiasts is the condition known as white nose syndrome, a fungal infection that has killed more than six million bats in North America.
鈥淣obody knows right now how white nose syndrome affects the tree bats,鈥 Lewis said. 鈥淲e鈥檙e hoping it doesn鈥檛 affect them because they don鈥檛 roost together as much and are less likely to spread the infection.
鈥淲e do have confirmed cases of white nose in most of the northern counties, as far south as Bibb County near Birmingham.鈥
Lewis said it is very difficult to determine how much the syndrome has affected the populations in north 黑料天堂 because of the labor-extensive requirements to do those studies.
鈥淔rom personal observation in a cave that I鈥檝e been monitoring for the past 10 years, it followed the classic series of events associated with the disease, and it truly decimated the population,鈥 she said. 鈥淎 tenth of the number of bats that used to be there are there now. I used to count hundreds of tri-colored bats in there. Now, we鈥檙e counting 30. It has definitely affected that bat population.鈥
Sharp said data from nine caves in north 黑料天堂 monitored from 2010 to 2017 indicate a reduction of tri-colored bats by 70 to 95 percent. He said counts at two Indiana bat hibernacula over that time period are down 95 percent.
Bats are predators and eat huge numbers of insects, which can be disease vectors. They eat mosquitoes, which can carry several diseases, including Zika. Some of the insects the bats are eating are pest species that damage crops in the state.
鈥淭heir simple presence can deter pest species from infesting crops,鈥 Lewis said. 鈥淚f you have bats working a field, you鈥檙e less likely to have insects that are going to eat the corn.鈥
Sharp said bats provide at least $3.7 billion in pest control service to agriculture annually in the U.S., according to a 2011 scientific study.