Effects of shore sedimentation to Tachypleus gigas (Mller 1785) spawning activity from Malaysian waters

Behara Satyanarayana, . and Moh Julia Hwei Zhong, . and Chowdhury Ahmed Jalal Khan, . and Nelson B. R., . and Nurul Ashikin Mat Zauki, . Effects of shore sedimentation to Tachypleus gigas (Mller 1785) spawning activity from Malaysian waters. pp. 41-60. ISSN 1823-8556

Ripraps land reclamation and fishing jetty renovation were perturbing Balok Beach shores between the years 2011 and 2013 and visible impacts were scaled using horseshoe crab spawning yields. Initially placement of ripraps at Balok Beach effectively reduced erosion and created a suitable spawning ground for the horseshoe crab Tachypleus gigas. However sediments begun to gather on the beach onward year 2012 which increased shore elevation and caused complete shore surface transition into fine sand properties. This reduced sediment compaction and made Balok Beach less favourable for horseshoe crab spawning. During the dry Southwest monsoon Balok River estuary retains more dense saline water which assists with sediment circulation at the river mouth section. Comparatively the less dense freshwater during the wet Northeast monsoon channels sediments shoreward. Circa-tidal action that takes place at Balok River sorts the shore sediments to produce an elevated and steep beach. Hence the reduced number of T. gigas nests and eggs retrieved during year 2013 (after comparing with yield of year 2012) at Balok Beach are indicating impacts from anthropic-caused sedimentation. Models need to be constructed and associated with T. Gigas spawning-migration to fully understand sediment transport especially at coastal areas that need or are undergoing nourishment.

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Abstract

Ripraps land reclamation and fishing jetty renovation were perturbing Balok Beach shores between the years 2011 and 2013 and visible impacts were scaled using horseshoe crab spawning yields. Initially placement of ripraps at Balok Beach effectively reduced erosion and created a suitable spawning ground for the horseshoe crab Tachypleus gigas. However sediments begun to gather on the beach onward year 2012 which increased shore elevation and caused complete shore surface transition into fine sand properties. This reduced sediment compaction and made Balok Beach less favourable for horseshoe crab spawning. During the dry Southwest monsoon Balok River estuary retains more dense saline water which assists with sediment circulation at the river mouth section. Comparatively the less dense freshwater during the wet Northeast monsoon channels sediments shoreward. Circa-tidal action that takes place at Balok River sorts the shore sediments to produce an elevated and steep beach. Hence the reduced number of T. gigas nests and eggs retrieved during year 2013 (after comparing with yield of year 2012) at Balok Beach are indicating impacts from anthropic-caused sedimentation. Models need to be constructed and associated with T. Gigas spawning-migration to fully understand sediment transport especially at coastal areas that need or are undergoing nourishment.

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Item Type:	Article
AGROVOC Term:	Horseshoe crabs
AGROVOC Term:	Shores
AGROVOC Term:	Estuaries
AGROVOC Term:	Coastal area
AGROVOC Term:	Spawning
AGROVOC Term:	Sedimentation
AGROVOC Term:	Seasons
AGROVOC Term:	Topography
AGROVOC Term:	Placement
AGROVOC Term:	Embryonic development
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:53
URI:	http://webagris.upm.edu.my/id/eprint/7891

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