ast bats: an introduction
TRANSCRIPT
An Introduction to Bats
What do YOU know about bats????
•Creepy, blind, blood-sucking RODENTS of the night…
• Bats are flying rats• Bats will attack you for no
reason• Bats will fly into your hair• Bats are blind
Actually…..•Those are all just BAT MYTHS•Bats won’t fly into your hair or attack you•They aren’t blind at all•And they aren’t even rodents……
Nobody likes me….
What are Bats?
Kingdom: AnimaliaPhylum: ChordataClass: MammaliaOrder: Chiroptera (hand-wing)Family: Flying Foxes Micro-batsSpecies: 166 759
Of 4200 mammal species, ~1000 are bats!
Bats are the only mammals capable of TRUE powered flight.Bats actually fly with their hands, not their arms!
Illustration from BCI Educator’s Activity Book
Where are the bats?•
Big Brown BatEptesicus fuscus
• One of the most common bats in urban areas and bat houses
• Often roost in buildings- prefers snags in natural habitat
• Often return to maternity roost where they were born
• Forage in a variety of habitats
Photo From BCI: www.batcon.org
Eastern Red BatLasiurus borealis
• Solitary, tree-roosting bat
• Hangs by one foot• Will also hibernate in
leaf litter on forest floor• About 3 young
Photo From BCI: www.batcon.org
Hoary BatLasiurus cinereus
• Solitary, roost among foliage on forest edges
• Can fly 35 km in one night while foraging
• Territorial over foraging sites
• Often migrate with bird flocks
• One of the most widespread bats in North America
Photo From BCI: www.batcon.org
Eastern PipistrellePipistrellus subflavus
• Common in forest edges and near agricultural areas
• One of first bats to emerge in evening
• Forage high in canopy
• Will hibernate in caves and in culverts
Photo From BCI: www.batcon.org
Northen Yellow BatLasiurus intermedius
• Roosts year-round in Spanish moss and palm fronds
• Abundant on the coast
• Will forage over sand dunes and beaches
• Typically have 3 pups
Photo From BCI: www.batcon.org
Bat Facts• Long lived (some up to 30 years)
• Possibly due to reduced metabolic activity during torpor.
• Low birthrate• Temperate zone bats usually have
~1 young/year.• Long period of infant dependency
• 2 month gestation and 1 month of infant dependency
• High survivorship• 50-80% chance of surviving each year
once adulthood is reached.• Common predators of bats are owls,
snakes, hawks and feral cats
What do Bats Eat?• Fruit- frugivore• Flower nectar - nectarivore• Reptiles, amphibians –carnivore• Fish- piscivore • Blood- sangrivore• Mosquitoes/Flies – insectivore
Why Are Bats Important?
• Bats pollinate many plant species.• Bats control insect populations.• They eat up from 50%-100% of their mass in insects (mosquitoes, black flies
moths) every night.
Bat Food Web• Plants are producers because they
get their energy from the sun;• A primary consumer eats producers;• Bats could be considered – Primary consumers if they eat plants– Secondary consumers if they eat
insects that eat plants– Tertiary consumers if they eat the bugs
that eat the bugs that eat the plants.
Food Web = inter-related food chains
What is Echo-location?• Bats chirp and then listen to the echoesechoes
that return from various objects.• Only micro-bats emit high frequency
chirps to use echo-location echo-location for navigation and prey capture.
• Most echolocation calls range from 9 to 200+ kHz (We hear up to 20 kHz).
Animation from www.batcon.org.
Bats and Rabies• Bats can be carriers of rabies.• Rabies is caused by a virus that attacks
the central nervous system.• Rabies can be transmitted through
saliva and can be fatal.• If you are exposed, you will need post-
exposure vaccinations ASAP.
Histoplasmosis• It is a respiratory disease that is
most often associated with droppings from birds, bats and rodents;
• Histoplasmosis is caused by a fungus that grows on the droppings.
• It causes serious flu-like symptoms depending on the exposure/number of spores inhaled and can be fatal.
Threats to Bat Populations• Habitat destruction • Loss of historical roost sites• Disturbance of roost sites, esp. caves• White Nose DiseaseWhite Nose Disease• Ignorance:– General public: negative attitudes– Scientific: Little is known about the
distribution, numbers and requirements of most bats
General Practices that Benefit Bats
• Protection of known or potential roosts, including: hollow trees, abandoned buildings, caves, bridges
• Creating artificial roosts• Maintaining water quality • Wise use of insecticides• Keep cats indoors!• Leave known bat populations
undisturbed
Common Methods For Studying Bat Populations
• Population Surveys: Counts– Roost/Nest– Nightly Dispersal– Ultrasonic Bat Detectors
• Population Surveys: Captures– Mist Nets– Harp Traps– Trip Lines (over water sources)
Basic Habitat Requirements for Bats• ROOST SITES:– Including maternity, bachelor and
hibernation roosts– Caves, hollow trees, stumps, live trees,
abandoned buildings, bridges, culverts, etc.
• FORAGING HABITAT:– Waterways, roads, pipelines, forests,
edges, clearings, beaches, etc.• WATER SOURCES:– Lakes, rivers, streams, bays, stock
tanks, swimming pools, etc.
Bat House DesignBat houses should have the following specs:– AT LEAST 2 ft. tall and 14
in. wide- bigger is better!– Have a 3-6 inch landing
strip covered with plastic hardware cloth below entrances
– Inner partitions (1-4+) should be ½ to 1 in. apart and covered with plastic hardware cloth or roughened manually
– Ventilation slot 6 in. from bottom of house
Photo From BCI: www.batcon.org
Bat House Placement• Full all day sun is
best- minimum is 6 hours of sun exposure a day
• Place near water if possible
• Mount house 15-20 ft. high
• Make sure entrance is unobstructed
Photo From BCI: www.batcon.org
Photo From BCI: www.batcon.org
Hot Topics in Bat Research• Phylogeny and evolution• Functional morphology• Echo-location study• Conservation Biology• North American Bat
Conservation Partnership (NABCP) Strategic Plan