AST Bats: An Introduction
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This document provides an overview of bats, debunking common myths and sharing factual information. It begins by addressing misconceptions about bats and then covers bat taxonomy, biology, ecology including their role in food webs and importance. Threats to bat populations such as habitat loss and White-Nose Disease are discussed. The document shares guidelines for bat house design and placement to help support local bat populations.
AST Bats: An Introduction
- 2. 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
- 3. 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….
- 4. What are Bats? Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Chiroptera (hand-wing) Family: Flying Foxes Micro-bats Species: 166 759 Of 4200 mammal species, ~1000 are bats!
- 6. 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
- 7. Where are the bats? •
- 8. Big Brown Bat Eptesicus 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 habitatsPhoto From BCI: www.batcon.org
- 9. Eastern Red Bat Lasiurus 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
- 10. Hoary Bat Lasiurus 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
- 11. Eastern Pipistrelle Pipistrellus 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
- 12. Northen Yellow Bat Lasiurus 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
- 13. 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
- 14. What do Bats Eat? • Fruit- frugivore • Flower nectar - nectarivore • Reptiles, amphibians –carnivore • Fish- piscivore • Blood- sangrivore • Mosquitoes/Flies – insectivore
- 15. 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.
- 16. 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.
- 18. Food Web = inter-related food chains
- 21. 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-locationecho-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.
- 22. 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.
- 23. 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.
- 24. 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
- 25. 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
- 26. 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)
- 27. 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.
- 28. Bat House Design Bat 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
- 29. 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
- 30. Hot Topics in Bat Research • Phylogeny and evolution • Functional morphology • Echo-location study • Conservation Biology • North American Bat Conservation Partnership (NABCP) Strategic Plan