Sediment loads have long been known

Sediment loads have long been known to be deleterious to corals, but the effects of turbidity and settling particles have not
previously been partitioned. This study provides a novel approach using inert silicon carbide powder to partition and
quantify the mechanical effects of sediment settling versus reduced light under a chronically high sedimentary regime on
two turbid water corals commonly found in Singapore (Galaxea fascicularis and Goniopora somaliensis). Coral fragments
were evenly distributed among three treatments: an open control (30% ambient PAR), a shaded control (15% ambient PAR)
and sediment treatment (15% ambient PAR; 26.4 mg cm22 day21
). The rate of photosynthesis and respiration, and the
dark-adapted quantum yield were measured once a week for four weeks. By week four, the photosynthesis to respiration
ratio (P/R ratio) and the photosynthetic yield (Fv/Fm) had fallen by 14% and 3–17% respectively in the shaded control,
contrasting with corals exposed to sediments whose P/R ratio and yield had declined by 21% and 18–34% respectively. The
differences in rates between the shaded control and the sediment treatment were attributed to the mechanical effects of
sediment deposition. The physiological response to sediment stress differed between species with G. fascicularis
experiencing a greater decline in the net photosynthetic yield (13%) than G. somaliensis (9.5%), but a smaller increase in the
respiration rates (G. fascicularis = 9.9%, G. somaliensis = 14.2%). These different physiological responses were attributed, in
part, to coral morphology and highlighted key physiological processes that drive species distribution along high to low
turbidity and depositional gradients.

ผลลัพธ์ (ไทย) 1:

ผลกระทบของตะกอนบนปะการังพลัง: แบ่งพาร์ทิชันผลกระทบของความขุ่นและตะกอนอนุภาค

ผลลัพธ์ (ไทย) 2:

ผลกระทบของตะกอนในคอรัลพลังงาน: แบ่งพาร์ทิชัน
ผลกระทบของความขุ่นและการชำระบัญชีอนุภาค

ผลลัพธ์ (ไทย) 3:

ผลกระทบของตะกอนหินพลัง : การ
ผลของความขุ่นและตะกอนอนุภาค