Supervisory Committee: Prof Emeritus Dr Faizah Shaharom*, Assoc ...
24
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 [email protected]
-
Upload
trinhquynh -
Category
Documents
-
view
217 -
download
0
Transcript of Supervisory Committee: Prof Emeritus Dr Faizah Shaharom*, Assoc ...
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
About Malaysia
Food
Horseshoe crab diversity
Chatterji et al., 1992, Sekiguchi and Nakamura, 1979
Size
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
Tachypleus gigas of Malaysia
Male
Female
Day 2 egg
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
Ecological pressure during embryogenesis
T. gigas nesting sites on east coast of Peninsular Malaysia
Case Study #1: Pantai Balok
Pantai Balok (Abundance of T. gigas (M+F) and nests)
Precipitation, decreased salinity
Sheltered area
Before severe human intervention
Highest tides
Recovery from intervention
Situation at Pantai Balok
Before disturbance: 2009-2010 After disturbance: 2011-2013
Situation at Pantai Balok (Con’t)
Dry Monsoon
Wet Monsoon
Nest Shifting: Pantai Balok
Case Study #2: Tanjung Selangor
Tanjung Selangor (Abundance of T. gigas (M+F) and nests)
Precipitation,
decreased salinity Sheltered area
Before severe human intervention
Situation at Tanjung Selangor
Before disturbance: 2009 After disturbance: 2010-2011
Situation at Tanjung Selangor (Con’t)
Dry Monsoon
Wet Monsoon
>Moisture Depth
<Moisture Depth
Nest Shifting: Tanjung Selangor
*Key= human impacts
S1-3 = Study sites
It's easier to dump trash here and there !
Unregulated waste
management
Fishing and boating
activities
However,
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
1st instar impairments (in situ)
Conservation efforts
Conservation challenges
‘Protected area’
2
34
We are harmless. Why hurt us ???
