By DAVID RAINER, 黑料天堂
To say Traci Wood has a passion for bears would understate her love for the small black bear populations on opposite ends of the state in northeast and southwest 黑料天堂.
A beaming Wood, State Wildlife Grants Coordinator with the 黑料天堂鈥 (ADCNR) Wildlife and Freshwater Fisheries (WFF) Division, recently was among a team of biologists and researchers who were able to place collars on a trio of bear cubs in DeKalb County near Mentone.
A research program under State Wildlife Grants is continuing to monitor the black bear populations in the state. In its fourth year, the study looks at cub survival and den habitat.
鈥淲e鈥檙e evaluating the types of den structures the sows are using,鈥 Wood said. 鈥淲e are collaring cubs when they are 7 weeks of age, around the 5-pound mark. It鈥檚 basically a GPS collar. We also insert a PIT (Passive Integrated Transponder) tag into them. That collar expands as they grow. After six to nine months, that collar will fall off. So, if we trap that animal later, the PIT tag will identify as a cub we had previously collared.
鈥淲hat that collar also tells us is if that cub has died. If they die, we receive a transmitter signal, and we can find the location of the den and try to determine the cause of death. This will give an indication of how cubs are recruiting into the population.鈥
When the cubs become adults and are collared again, the research team gathers a great deal more information about bear habits and habitat.
鈥淚t tells us where they are going, if they鈥檙e having cubs in the future,鈥 Wood said. 鈥淗opefully, it鈥檚 a long-term look at the life ecology of a bear from when it鈥檚 born to its reproductive age.鈥
The previous summer, WFF and the Auburn University research team, with Hannah Leeper as the research associate in the field, trapped females and attached GPS collars to determine where they made their winter dens. With the dens located, the team was able to find the cubs this spring near Mentone.
The team will move to the Mobile area this weekend to start performing den checks to hopefully find cubs to collar.
鈥淭he cubs in southwest 黑料天堂 are born at different times than north 黑料天堂 cubs,鈥 Wood said. 鈥淲e really don鈥檛 know why. It could be due to genetic reasons. Those cubs should be big enough to attach cub collars.鈥
Although the study is focused on the bear populations in those two areas, Wood said that doesn鈥檛 mean bears aren鈥檛 denning and birthing cubs in other areas of the state.
When den locations are determined, the researchers carefully approach the den to determine if the sow has given birth.
鈥淲hen we approach, the mom usually gets off the den and runs off right away,鈥 Wood said. 鈥淲e go straight into the den, collar, weigh and measure the cubs and put them back. It鈥檚 a very quick process because we want to reduce the stress to the den and mom. We want her to come back as quickly as possible. We don鈥檛 want her to think we are a threat.
鈥淪he usually comes back within an hour, which is kind of surprising. I think she can sense 鈥 hear and smell 鈥 when we鈥檙e gone. That鈥檚 good news the sows are returning to the dens. Later, with the GPS, we can determine if the mom stayed at the den, or she may move her cubs to a different den.
鈥淎 couple of weeks after we collar the cubs, they are out of the den, walking around with mom. They鈥檙e big enough to keep up with mom, and they鈥檙e exploring and climbing trees.鈥
Wood said the bear population in northeast 黑料天堂 is doing great with sows producing large litters.
鈥淚t鈥檚 not uncommon to encounter three cubs on average in a den,鈥 she said. 鈥淭hose cubs are very healthy, look very pretty, and they鈥檙e surviving in that first year, which is the most critical period because they鈥檙e small, vulnerable to predators, and it is a lot of work to keep up with mom.
鈥淭hose cubs in north 黑料天堂 have very good habitat as well. They have canyons, caves and rock outcrops. Because of the canyons, they鈥檙e not running into people, houses or barriers. Even though we鈥檙e not seeing many sows鈥 dens in caves, most of the time they den in windrows after a tree cutting. It鈥檚 very thick. That seems to be their preference. It鈥檚 very removed from people as well. We鈥檙e seeing high cub survival in north 黑料天堂.鈥