Nutrient limitation and enzymolysis of phosphorus in Meiliang Bay, Lake Taihu, during algal blooms

Abstract

In this study, algal growth potential tests were performed in water samples collected from six sampling sites in Meiliang Bay, Lake Taihu. The potential release of soluble reactive phosphorus (SRP) by enzymatic hydrolysis of enzymatically hydrolyzable phosphorus (EHP) was simultaneously evaluated. Results show that all studied regions were in highly eutrophic states, with additional nitrogen (N) or phosphorus (P) inputs, inducing negligible further increase in algal growth. EHP in water could be rapidly transformed into SRP, further supporting the proliferation of algal blooms. The shortest EHP mineralization time was calculated as 69 minutes; therefore, limiting specific nutrient inputs alone in extremely eutrophic lakes can have a limited effect on suppressing the proliferation of algal blooms. Methods to establish a suitable environmental fate for excessive nitrogen and phosphorus nutrients may be more effective and provide more significant results. Practitioner points N and P were no longer serving as the limiting factors in Meiliang Bay. Enzymatically hydrolysable phosphorus could be hydrolyzed into soluble reactive phosphorus in a very short period during algal blooms. Both enzymatically hydrolysable phosphorus and soluble reactive phosphorus are required to be curbed in practical eutrophication control.

Chelonid Alphaherpesvirus 5 Prevalence and First Confirmed Case of Sea Turtle Fibropapillomatosis in Grenada, West Indies

“…In a study on environmental eutrophication in Hawaii, the prevalence of clinical fibropapillomatosis paralleled nitrogen-footprint patterns associated with urbanization, sewage injection wells, sugar and pineapple agriculture, and boat harbors [ 63 , 64 ]. One sequela that can occur with these events is nutrient overload, which may result in increased algal blooms [ 65 ]. Oncogenic compounds such as okadaic acid, lyngbyatoxin A, brevetoxins, and other biotoxins produced by algal species have been hypothesized to be associated with fibropapillomatosis [ 66 , 67 , 68 ]; however, no correlation has been found between fibropapillomatosis and toxin exposure [ 69 ].…”