Invasion of the black rat rattus rattus
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Invasion of the Black Rat Rattus rattus. Alexis Roque Karin Lisa Sirjoo. Introduction. Species: Rattus rattus Also Know as Ship Rat and Roof Rat Originated in Asia Found primarily around human habitations Mainly vegetarian diet.

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Invasion of the Black Rat Rattus rattus

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Invasion of the black rat rattus rattus

Invasion of the Black Rat Rattus rattus

Alexis Roque

Karin Lisa Sirjoo


Introduction

Introduction

  • Species: Rattusrattus

  • Also Know as Ship Rat and Roof Rat

  • Originated in Asia

  • Found primarily around human habitations

  • Mainly vegetarian diet

http://www.jcu.edu.au/discovernature/idc/groups/public/documents/presentation/jcudev_008406~2.3.jpg

http://www.taiko.org.nz/rat1.jpg


Physical description

Physical Description

  • Medium sized body

  • Large ears

  • Tail usually longer than body

  • Weighs between 70 to 300 grams

  • Usually black

  • Can be any combination of black, white or grey

  • Males longer and heavier than females

http://lavieavec.unblog.fr/2007/07/03/la-beste-suite/


Lifestyle

Lifestyle

  • Black Rats are nocturnal and omnivorous

  • Breed and reproduce throughout the year

  • Live together in large groups

http://www.michaelspornanimation.com/splog/wp-content/e/ratatouille06.jpg


Geographic distribution

Geographic Distribution

  • Found on all continents especially tropical regions

  • Most common in coastal areas

  • Agile climber – often lives in high places like top floors of buildings or in trees

  • Rarely swims

  • Spreads disease

http://www.biokleen.co.uk/gif/rat.gif


Black rat vs santiago rice rat

Black Rat Vs. Santiago Rice Rat

  • The Black Rat negatively affects the population of the Rice Rats

  • Interference of population by aggression

  • Removal of R. rattus slowed population decline of N. swarthi

http://www.hear.org/galapagos/invasives/images/nswarthi.jpg


Black rat vs santiago rice rat1

Interference Competition

Both species share the same interest in food sources

General encounters cause confrontation between species

Climate factors affect the population growth of the Black Rat

Black Rat Vs. Santiago Rice Rat


Black rat vs deer mice

Deer mice is native to the California Channel Islands

Black Rat affects Deer Mice in 2 ways:

1. Increasing Predation & Competition

2. Introducing new parasites & diseases

Parasite: Whipworm - Trichuris muris

Habitat and foraging behavior overlap

Black Rat Vs. Deer Mice


Black rat vs deer mice1

Black Rat Vs. Deer Mice

http://www.marvistavet.com/assets/images/whipworm.gif

http://share3.esd105.wednet.edu/rsandelin/NWnature/Photos/Deer%20mouse.jpg

  • Whipworm is transferred through contaminated materials and foods

  • Eggs of the worm are infectious within 3 weeks of being passed from the system


Black rat vs sea birds

Black Rat Vs. Sea Birds

  • Black rat is largest contributor to seabird extinction

  • Prey mostly on on small burrow nesters

  • Smaller birds are more vulnerable

http://www.flickr.com/photos/cuba_photos/510171343/


Invading the canary islands

Invading the Canary Islands

  • Seven main islands

  • 100km from NW coast of Africa

  • Varied vegetation

  • 3672 terrestrial endemic species

  • Of those, 1434 introduced by man

www-biology.ucsd.edu/news/images/05010704-07L

www.ferdinando.org.uk/images/Canary%20Islands.jpg


Invading the canary islands ecological effects of rattus rattus

Invading the Canary IslandsEcological Effects of RattusRattus

  • One of the world’s100 worst invasive species (IUCN, 2001)

  • Present on all 7 islands

  • Arrived with European conquistadors in the 15th century

http://home.earthlink.net/~cyberkiwi/soldiers/magellan.jpg


Invading the canary islands ecological effects of rattus rattus1

Invading the Canary IslandsEcological Effects of RattusRattus

  • Affects plant regeneration and structure

  • Predator of birds, especially eggs and chicks

  • Causes decreased breeding success in birds

http://www.hawaii-forest.com/_img/natural-history/conservation-002.jpg


Human prevention

Human Prevention

  • Sanitation

  • Traps & Poison baits

  • Sound & Electronic devices

  • Control by cats & dogs

  • Eradication

http://www.orlandorats.com/images/cheese.jpg

http://www.mitchamcouncil.sa.gov.au/webdata/resources/images/rat1.jpg


References

References

  • Harris, Donna B., Gregory, S.H., Macdonald, D.W. 2006. Space invaders? A search for patterns underlying the coexistence of alien black rats and Galápagos rice rats. Oecologia149:276-288.

  • Harris, Donna B., Macdonald, D.W. 2007. Interference competition between introduced black rats and endemic Galapagos rice rats. Ecology 88:2330.

  • Jones. 2007. Severity of the Effects of Invasive Rats on Seabirds: A Global Review. Conservation Biology 22:16-26.

  • Nogales, M., Rodriguez, J.L., Marrero, P. 2006. Ecological effects and distribution of invasive non-native mammals on the Canary Islands. Mammal Society 36:49-65.

  • Smith, Katherine F., Carpenter, S.M. 2006. Potential spread of introduced black rat (Rattusrattus) parasites to endemic deer mice (Peromyscusmaniculatus) on the California Channel Islands. Diversity distributions 12:742.


Questions

Questions?


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