By Hildie Maria E. Nacorda
Based on examine in Bolinao, this e-book assesses the significance of small-scale disturbance by way of burrowing shrimps. It covers the distribution of burrowing shrimp disturbance, the habit of the snapping shrimp Alpheus macellarius in situ and as saw from tank experiments, and the consequences of momentary burial and leaf clipping at the progress styles of the dominant seagrass Thalassia hemprichii. The booklet examines the position of bioturbation via burrowing shrimps in seagrass meadows, foraging techniques of A. macellarius and its mutualistic symbiosis with Cryptocentrus spp., shrimp disturbance and T. hemprichii, and small-scale disturbance and large-scale dynamics.
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Additional info for Burrowing Shrimps and Seagrass Dynamics in Shallow-Water Meadows off Bolinao (New Philippines): UNESCO-IHE PhD
Sample text
The distribution of burrow openings, on the other hand, appeared clumped (Table 3). There was a clear overlap in the densities and sizes of sand patches and burrow openings of alpheid shrimps with those of sand mounds and of associated shafts of thalassinidean shrimps, especially on the shallow seagrass areas (~1 m depth) (Fig. 4, a). 05; Fig. 4, b; Table 3), the latter having projected areas of 12 and 14% of our grid (1 m2) (maximum = 40 and 45%; maximum heights = 31 and 57 cm). 05, Table 3; Fig.
3, top graphs). Sand mounds were similar in both environments, on average, but mound maxima, shaft densities, and shaft maxima were reduced in turbid areas (Fig 3, bottom graphs). The distribution patterns of shrimp disturbance were not similar, with sand patches occurring more regularly in the quadrats than the sand mounds and shafts, which occurred at random (Table 3). The distribution of burrow openings, on the other hand, appeared clumped (Table 3). There was a clear overlap in the densities and sizes of sand patches and burrow openings of alpheid shrimps with those of sand mounds and of associated shafts of thalassinidean shrimps, especially on the shallow seagrass areas (~1 m depth) (Fig.
1, a) and in wave-exposed Site 18 (Pangaldaoan) (Fig. 1, b). The exposed sites of Region II had reduced densities and sizes of sand patches, burrow openings, and mound-associated shafts (Table 3). Sand mounds were low and appeared as ‘moon-scapes’ that covered 9 ± 4% of the bed. In the protected beds of Regions I and III, we observed our sampling quadrat of 9 m2 to include 9 ± 1 sand patches of alpheid shrimps (maximum = 2 m-2) with altogether 20 ± 5 burrow openings (maximum = 10 m-2), 3 ± 1 sand mounds of thalassinidean shrimps (maximum = 3 m-2), and 3 ± 1 mound-associated shafts (maximum = 3 m-2) within funnel-shaped surface openings.