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presentation prepared by st antonys students as part of their exibition

presentation prepared by st antonys students as part of their exibition



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    Bat Bat Presentation Transcript

    • 2011 As the international year of bat
    • This is a presentation presenting before you By the team of ST.ANTONY’S H.S.S PLASSANAL AJAY SIVAN AKASH RAJ JOSE CLEMENT
    • An Introduction to Bats
    • Bats can fly, but they are not birds.
    • Bats have fur . Their wings are made of skin.
    • BATS
      • Creepy, blind, blood-sucking RODENTS of the night….right?
      • 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……
      No body likes me….
    • Bats hang upside down when they sleep. This is called roosting.
    • What do Bats Eat?
      • FRUIT- “frugivory”
      • FLOWERS- nectar or pollen
      • CARNIVORES- birds, reptiles, amphibians
      • FISH- highly specialized carnivores
      • BLOOD- “sangrivory”
      • INSECTS- aerial or foliage gleaners
    • How do Bats Fly?
      • Bats are the only mammals capable of TRUE powered flight
    • Bats have arms and hands like you . hands fingers BAT
    • Bats Actually Fly With Their Hands, Not Their Arms!
    • What is Echolocation?
      • Microbats use ECHOLOCATION for navigation and prey capture:
    • Bats are nocturnal. They stay awake at night and hunt for food. Do you know what some bats eat? insects
    • When the sun goes down Bats will come outside Through the dark They fly around With echoes as their guides.
    • Why Are Bats Important?
      • Bats are important pollinators of many plant species including the agave plant (ie. Tequila), the saguaro cactus and many rainforest plant species
      • Bats are vital for the control of insect populations
    • Economic Importance of Bats in Agriculture
      • The story of Mexican free-tailed bats in Central Texas
        • Bracken Cave: ~20 million Mexican free-tailed bats (single largest aggregation of mammals in the world)
        • Central Texas caves, including Bracken Cave, are summer maternity roosts for ~ 100 million Mexican free-tailed bats
        • It is estimated that these bats eat about 2 million lbs of insects every night
    • Rabies Prevention
      • DON’T HANDLE WILD MAMMALS, including bats!!!!!!
      • Keep your pets vaccinated
      • If you think you have been exposed, seek medical attention promptly
    • Bats in Georgia: 16 Species
    • Family Vespertilionidae: The Evening Bats
    • Tadarida brasiliensis Mexican Free-tailed bat
      • Rare- possibly declining in numbers due to habitat loss
      • Roosts in abandoned buildings, hollow trees and caves in or near bottomland hardwood habitats
      • Will glean insects from foliage or capture them in flight
      • Easily disturbed
    • Southeastern Myotis Myotis austroriparius
      • Species of Concern by USFWS
      • Cave bat eastern US
      • Roosts in hollow trees, culverts, and bridges in areas w/o caves
      • Also associated with bottomland hardwood areas
      • Only Myotis bat to have twins
    • Big Brown Bat Eptesicus fuscus
      • One of the most common bats in urban areas and bat houses
      • Often roots in buildings- prefers snags in natural habitat
      • Often return to maternity roost where they were born
      • Forage in a variety of habitats
    • Eastern Red Bat Lasiurus borealis
      • Solitary, tree-roosting bat
      • Hangs by one foot
      • Will also hibernate in leaf litter on forest floor
      • Used to form large daytime migratory flocks in 1800’s
      • 2-5 young (usually 3)
    • Hoary Bat Lasiurus cinereus
      • Solitary, roots among foliage on forest edges
      • Can fly 24 miles in one night while foraging
      • Territorial over foraging sites
      • Often migrate with bird flocks
      • One of the most widespread bats in N. America
      • Hawaii’s only native land mammal
    • Evening Bat Nycticeius humeralis
      • Abundant in SE US
      • Forest bat- hardly ever in caves
      • Little is known about its migration patterns
    • 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
    • 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
    • Family Molossidae The Free-tailed Bats
    • Mexican Free-tailed Bat Tadarida brasiliensis
      • Another very common urban and bat house bat
      • One of most widely distributed mammals in Western Hemisphere
      • Highly gregarious
      • Much of the population is migratory
    • Bat Conservation
    • Threats to Bat Populations
      • Loss of historical roost sites
      • Disturbance of roost sites, esp. caves
      • Ignorance:
        • General public: negative attitudes
        • Scientific: Very little is known about the distribution, numbers and specific requirements of most bat species
      • Habitat destruction/fragmentation
    • Hot Topics in Bat Research
      • Phylogeny and evolution
      • Functional morphology
      • Echolocation
      • Conservation Biology
        • North American Bat Conservation Partnership (NABCP) Strategic Plan
    • Top 5 Conservation Research Goals (NABCP)
      • Goal 1: Identify key resources- Flyways, roosts, drinking and foraging habitats
      • Goal 2: Establish baseline populations and trends
      • Goal 3: ID species requirements and limiting factors
      • Goal 4: Describe, quantify, and monitor the effects of current land-management practices and other human disturbances on bats.
      • Goal 5: Quantify the economic and social impacts of North American bats.
    • Top 4 Management Goals (NABCP)
      • Goal 1: Develop management standards and guidelines for bats, including them in existing management plans for other wildlife and associated habitat.
      • Goal 2: Identify, protect, and enhance key roosting, feeding, and drinking resources for bats. Reestablish bat populations to the extent necessary.
      • Goal 3: Incorporate bat conservation language into existing statutes for wildlife protection.
      • Goal 4: Integrate strategic plans for bats into other existing plans and initiatives.
    • Common Methods For Studying Bat Populations
      • Population Surveys: Counts
        • Direct Roost Counts
        • Nightly Dispersal Counts
        • Maternity Roost Counts
        • Ultrasonic Bat Detectors
          • Simple handheld
          • ANABAT (records for computer analysis)
      • Population Surveys: Captures
        • Mist Nets
        • Harp Traps
        • Trip Lines (over water sourcesaa)