supervisory committee: prof emeritus dr faizah shaharom*, assoc
TRANSCRIPT
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The Urgency for Conservation of Tachypleus gigas at Disturbed Breeding Beaches on the East Coast of
Peninsular Malaysia
Bryan Raveen Nelson Institute of Tropical Aquaculture, Universiti Malaysia
Terengganu
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About Malaysia
Food
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Horseshoe crab diversity
Chatterji et al., 1992, Sekiguchi and Nakamura, 1979
Size
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Horseshoe crab sightings in Malaysia
123
4
5
6789
101113
12
14
1516
-Tt-Tt
-Tg-Tg
-Tg
-Tg
-Cr
-Tg-Tg & -Cr
-Tg
-Tg-Tg & -Cr
-Tg & -Cr-Tg
-Tg-Tg & -Cr
NN
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Tachypleus gigas of Malaysia
Male
Female
Day 2 egg
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Horseshoe crab embryogenesis (T. gigas)
Chatterji, 1994
1 3 5
34
3127
13 187
38 43
22
Nelson et al., 2012
*Numbers represent days*Alphabet represent stage
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Ecological pressure during embryogenesis
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T. gigas nesting sites on east coast of Peninsular Malaysia
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Case Study #1: Pantai Balok
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Pantai Balok (Abundance of T. gigas (M+F) and nests)
Precipitation, decreased salinity
Sheltered area
Before severe human intervention
Highest tides
Recovery from intervention
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Situation at Pantai Balok
Before disturbance: 2009-2010 After disturbance: 2011-2013
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Situation at Pantai Balok (Con’t)
Dry Monsoon
Wet Monsoon
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Nest Shifting: Pantai Balok
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Case Study #2: Tanjung Selangor
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Tanjung Selangor (Abundance of T. gigas (M+F) and nests)
Precipitation,
decreased salinity Sheltered area
Before severe human intervention
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Situation at Tanjung Selangor
Before disturbance: 2009 After disturbance: 2010-2011
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Situation at Tanjung Selangor (Con’t)
Dry Monsoon
Wet Monsoon
>Moisture Depth
<Moisture Depth
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Nest Shifting: Tanjung Selangor
*Key= human impacts
S1-3 = Study sites
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It's easier to dump trash here and there !
Unregulated waste
management
Fishing and boating
activities
However,
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Compromised embryogenesis
Aspergilus sp. Streptococcus sp. (30 %) in+exBacillus sp. (20 %) exVibrio sp. (15 %) in+exMyxobacter (15 %) ex
Staphylococcus sp. (10 %) ex
Shigella sp. (10 %) in+ex
*Key: in = yolk plasmaex = embryonic shell
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1st instar impairments (in situ)
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Conservation efforts
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Conservation challenges
‘Protected area’
2
34
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We are harmless. Why hurt us ???