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Overview of Common Types of Parasite Life Cycles презентация
Содержание
- 1. Overview of Common Types of Parasite Life Cycles
- 2. Definitions of Hosts Many parasites have more
- 3. Definitions of Hosts Definitive host – a
- 4. Definitions of Hosts Definitive host – a
- 5. Definitions of Hosts Definitive host – a
- 6. Definitions of Hosts Vector- any agent, either
- 7. Definitions of Hosts Vector- any agent, either
- 8. Definitions of Hosts Vector- any agent, either
- 9. Outline Monogenea: Direct Life Cycles and Autoinfection
- 10. Platyhelminthes
- 11. Phylum Platyhelminthes Class Trematoda Subclass Digenea Class Cestoidea Class Monogenea
- 12. Class Monogenea: Most ecto-parasites of fish. Some
- 13. Opisthaptor (Haptor) Ciliated larva
- 16. Life cycle of Ecto parasitic monogenean
- 17. Gyrodactylus sp.
- 18. Adult worms contain several generations of embryos
- 19. The embryo is separated from the parental
- 20. Gyrodactylus The reproductive biology of Gyrodactylus
- 22. Gyrodactylus sp.
- 23. Diplozoon paradoxum
- 25. Polystoma nearcticum Life cycle of Endo parasitic monogenean
- 26. Polystoma nearcticum
- 30. Spadefoot toad
- 31. Tadpole of Spadefoot toad
- 32. Tadpoles of Spadefoot Toads
- 33. Temporal adaptation Spadefoot toads are parasitized by a Monogenean Pseudodiplorchis americanus
- 34. Pseudodiplorchis americanus Polystoma nearcticum
- 35. Pseudodiplorchis americanus
- 36. Pseudodiplorchis americanus
- 37. Pseudodiplorchis americanus
- 46. Autoinfection
- 47. Oculotrema hippopotami
Definitions of Hosts Many parasites have more than one host in their life cycle. These hosts have different roles and are given specific names.
Слайд 2Definitions of Hosts
Many parasites have more than one host in their
life cycle. These hosts have different roles and are given specific names.
Слайд 3Definitions of Hosts
Definitive host – a host in which the parasite
reaches sexual maturity and undergoes reproduction.
Слайд 4Definitions of Hosts
Definitive host – a host in which the parasite
reaches sexual maturity and undergoes reproduction.
Intermediate – a host in which the parasite undergoes larval development but does not reach sexual maturity.
Intermediate – a host in which the parasite undergoes larval development but does not reach sexual maturity.
Слайд 5Definitions of Hosts
Definitive host – a host in which the parasite
reaches sexual maturity and undergoes reproduction.
Intermediate – a host in which the parasite undergoes larval development but does not reach sexual maturity.
Paratenic host (Transport host) – a host in which a parasite survives without undergoing further development. A paratenic host accumulates and maintains stages of a parasite, and although beneficial, is not essential to the life cycle.
Intermediate – a host in which the parasite undergoes larval development but does not reach sexual maturity.
Paratenic host (Transport host) – a host in which a parasite survives without undergoing further development. A paratenic host accumulates and maintains stages of a parasite, and although beneficial, is not essential to the life cycle.
Слайд 6Definitions of Hosts
Vector- any agent, either animate or inanimate (such as
wind, water, or arthropod) that transmits an infectious organism.
Слайд 7Definitions of Hosts
Vector- any agent, either animate or inanimate (such as
wind, water, or arthropod) that transmits an infectious organism.
Biological Vector- a vector in which a parasite lives or develops. The parasite undergoes morphologic change and/or multiplication, and the vector is usually essential for the life cycle.
Biological Vector- a vector in which a parasite lives or develops. The parasite undergoes morphologic change and/or multiplication, and the vector is usually essential for the life cycle.
Слайд 8Definitions of Hosts
Vector- any agent, either animate or inanimate (such as
wind, water, or arthropod) that transmits an infectious organism.
Biological Vector- a vector in which a parasite lives or develops. The parasite undergoes morphologic change and/or multiplication, and the vector is usually essential for the life cycle.
Mechanical Vector- a vector which transmits a parasite by mechanical means only. It may be living or non-living and is not essential for the parasite’s life cycle.
Biological Vector- a vector in which a parasite lives or develops. The parasite undergoes morphologic change and/or multiplication, and the vector is usually essential for the life cycle.
Mechanical Vector- a vector which transmits a parasite by mechanical means only. It may be living or non-living and is not essential for the parasite’s life cycle.
Слайд 9Outline
Monogenea: Direct Life Cycles and Autoinfection (Complex or Simple?)
Trematoda (Digenea): Complex
Life Cycles
Difficulty of Solving Life Cycles Example Cestodes (Tapeworms)
Difficulty of Solving Life Cycles Example Cestodes (Tapeworms)
Слайд 12Class Monogenea:
Most ecto-parasites of fish.
Some endo-parasites of urinary bladder and mouth
of amphibians and reptiles.
Body covered by tegument.
Posterior hooks with opisthaptor (haptor).
Direct life cycle with single host.
Body covered by tegument.
Posterior hooks with opisthaptor (haptor).
Direct life cycle with single host.
Слайд 18Adult worms contain several generations of embryos boxed one inside another
and are often referred to as "Russian Dolls".
Each parasite gives birth to a fully grown worm which attaches to the host alongside its parent and this can lead to exponential population growth.
Each parasite gives birth to a fully grown worm which attaches to the host alongside its parent and this can lead to exponential population growth.
Слайд 19The embryo is separated from the parental by a metabolically-active uterus
lining, which appears to form a "placental-type" role. The F2 embryo (not shown) derives its nutrients directly from the F1 embryo.
Слайд 20Gyrodactylus
The reproductive biology of Gyrodactylus is further complicated as different
modes of reproduction (asexual, parthenogenesis and sexual) may be involved in the life cycle of an individual worm.
Слайд 33Temporal adaptation
Spadefoot toads
are parasitized by
a Monogenean
Pseudodiplorchis americanus
