Biological Control of the invasive Biological Control of the - - PowerPoint PPT Presentation

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Biological Control of the invasive Biological Control of the invasive New Zealand Mud Snail: New Zealand Mud Snail: Is it possible? Is it possible? Gabriela Navas Navas Gabriela University of California Santa Barbara University of

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Biological Control of the invasive Biological Control of the invasive New Zealand Mud Snail: New Zealand Mud Snail: Is it possible? Is it possible?

Gabriela Gabriela Navas Navas

University of California Santa Barbara University of California Santa Barbara Mentor: Mentor: Dr. Ryan Hechinger, Julio

  • Dr. Ryan Hechinger, Julio Lorda

Lorda Faculty Advisor: Faculty Advisor: Prof. Armand Kuris

  • Prof. Armand Kuris

Department: Department: Ecology, Evolution and Marine Biology Ecology, Evolution and Marine Biology Funding: Funding: UCLeads UCLeads Program and Program and CNSI CNSI

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The New Zealand Mud Snail The New Zealand Mud Snail Potamopyrgus Potamopyrgus antipodarum antipodarum Why is it a problem? Why is it a problem? Is bio control an option? Is bio control an option?

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The New Zealand Mud Snail The New Zealand Mud Snail

Invasive species (where and when) USA, Europe and Australia First discovered in US at Idaho’s Snake River in 1987 Densities often reach > 40,000 individuals per m2 High temperature and salinity tolerance

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Why is Why is P.

  • P. antipodarum

antipodarum a problem? a problem?

One female snail is all it takes to establish a

colony (20-120 embryos per female)

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New Zealand Mud Snail New Zealand Mud Snail’ ’s promising s promising natural enemy: natural enemy: Microphallus Microphallus sp. sp.

  • Life cycle of parasite

Life cycle of parasite involves only one involves only one intermediate host intermediate host

  • High host specificity

High host specificity

  • No

No pathogenicity pathogenicity on the

  • n the

vertebrate host vertebrate host

http://www.indiana.edu/~curtweb/Research/About%20Microphallus.html

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Eggs released and consumed by snail Asexual Reproduction of larval stages and encysting in snail Ingestion of snail by final host Adult Microphallus in duck intestine

http://www.indiana.edu/~curtweb/Research/About%20Microphallus.html

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Adult Microphallus in duck intestine

http://www.indiana.edu/~curtweb/Research/About%20Microphallus.html

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Life Cycle of Microphallus sp.

Adult life stage in duck does not harm duck Adult Microphallus is hermaphrodite reproducing

sexually.

Eggs are released through duck’s feces.

http://www.phsource.us/PH/HELM/helminth_taxo.htm

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Asexual Reproduction of larval stages and encysting in snail

http://www.indiana.edu/~curtweb/Research/About%20Microphallus.html

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This summer

Examine the relationship between shell length

and body mass on preserved snail samples previously collected from throughout New Zealand

Calculate biomass of native sites

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Total Weight versus Length

5 10 15 20 25 30 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0

Length in mm W eight in m g

TK3 CH1 CH4 TK2 GY3 CH2 AX1 DN6 DN9 DN8 DN5 TK1 TK5

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Average Weight vs. Length

0.0 5.0 10.0 15.0 20.0 25.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0

Length in mm

Average weight in mg

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Continued Research

Raise local invasive NZMS Infect them with parasitic trematode Calculate the biomass of NZMS

populations and the effect of Microphalllus sp. on the reproductive

  • utput and population biomass

Effect of trematode on other

Hydrobiidae in affected areas.

http://www.sunsite.ualberta.ca/Projects/Aquatic_Invertebrates/thumbnails/tPlate14.1.jpg

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Special Thanks to:

Kuris Lab Julio Lorda Ryan Hechinger UC Leads CNSI- Thank you Ofi and Eric!

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Questions ?

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http://delta-intkey.com/britmo/images/adams081.jpg

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What is bio control? What is bio control?

“ The intentional introduction of an exotic, usually co-evolved, biological control agent for permanent establishment and long-term pest control” (Eilenberg et al 2001).

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Bio control of Bio control of Potamopyrgus Potamopyrgus antipodarum antipodarum? ?

1.

Measuring snails to calculate logistic regression between size and infection status. Data will also be used for future morphological studies.

2.

Calculating length and weight relationships to quantify the effect of parasitism at the population level.

3.

Quantifying the snail allocation to shell and soft body tissues through step 2.

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What is bio control? What is bio control?

Dissect snails and identify: Dissect snails and identify:

  • Length to Weight relationships.

Length to Weight relationships.

  • Allotment to shell

Allotment to shell development. development.

JL6

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Slide 28 JL6 You could have this picture when you explain that this snails are parthenogenic and say that females clone themselves and produced this cute little crawl away young.

Julio Lorda, 7/9/2009

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What is bio control? What is bio control?

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