Presentation Title

Effect of M. Micrantha on Gas Exchange and Light Availability on Mangroves in Mai Po Nature Reserve

Faculty Mentor

Cheryl Swift

Start Date

18-11-2017 2:15 PM

End Date

18-11-2017 3:15 PM

Location

BSC-Ursa Minor 81

Session

Poster 3

Type of Presentation

Poster

Subject Area

biological_agricultural_sciences

Abstract

Mangrove forest located at the Mai Po Nature Reserve in Hong Kong is impacted by the invasion of the South American vine- M. micrantha. This species creates competition for light with mangroves because M. micrantha, climbs the mangroves and creates a dense layer of leaves on top of the mangrove’s canopy. Reduced light availability reduces carbon uptake, and can potentially result in carbon starvation and death of mangrove individuals. We hypothesized that lower light availability in invaded sections of mangrove canopy would decrease gas exchange, and that leaf structure might reflect lower light availability. We tested this hypothesis by taking the stomatal conductance, water potentials, specific leaf area, and light measurements for two species of mangroves- Aegiceras corniculatum and Kandelia obovata. We then tested two methods of clearing the vine, one by cutting off the lower half of the vine and letting the vine on top of the canopy die and the other by removing all of the vine from the canopy of mangrove individuals. We again measured stomatal conductance, water potentials, and light about five days later after removal of M. micrantha to see if the change in light availability increased gas exchange. We saw that for both Aegiceras corniculatum and Kandelia obovata there was a higher stomatal conductance for the leaves that were not covered by the vine. We also saw a less negative value for Aegiceras corniculatum and Kandelia obovata for pre-dawn water potentials when compared to the mid-day water potentials of Aegiceras corniculatum and Kandelia obovata.

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Nov 18th, 2:15 PM Nov 18th, 3:15 PM

Effect of M. Micrantha on Gas Exchange and Light Availability on Mangroves in Mai Po Nature Reserve

BSC-Ursa Minor 81

Mangrove forest located at the Mai Po Nature Reserve in Hong Kong is impacted by the invasion of the South American vine- M. micrantha. This species creates competition for light with mangroves because M. micrantha, climbs the mangroves and creates a dense layer of leaves on top of the mangrove’s canopy. Reduced light availability reduces carbon uptake, and can potentially result in carbon starvation and death of mangrove individuals. We hypothesized that lower light availability in invaded sections of mangrove canopy would decrease gas exchange, and that leaf structure might reflect lower light availability. We tested this hypothesis by taking the stomatal conductance, water potentials, specific leaf area, and light measurements for two species of mangroves- Aegiceras corniculatum and Kandelia obovata. We then tested two methods of clearing the vine, one by cutting off the lower half of the vine and letting the vine on top of the canopy die and the other by removing all of the vine from the canopy of mangrove individuals. We again measured stomatal conductance, water potentials, and light about five days later after removal of M. micrantha to see if the change in light availability increased gas exchange. We saw that for both Aegiceras corniculatum and Kandelia obovata there was a higher stomatal conductance for the leaves that were not covered by the vine. We also saw a less negative value for Aegiceras corniculatum and Kandelia obovata for pre-dawn water potentials when compared to the mid-day water potentials of Aegiceras corniculatum and Kandelia obovata.