Adult eelgrass shoots rule seedling destiny in giant seagrass meadow in eutrophic bay of northern China

Adult eelgrass shoots rule seedling fate in large seagrass meadow in eutrophic bay of Northern China
Seasonal variability of Zostera marina sexual and asexual replica (A), and map displaying crimson tide occurrences in Bohai Bay from 2000 to 2016 (B). Credit: IOCAS

Seagrasses are submerged marine angiosperms, which play key ecological roles in coastal ecosystems. The seagrass Zostera marina L. (eelgrass) is a marine basis species and is essentially the most widespread seagrass species all through the Atlantic and Pacific coasts of the temperate northern hemisphere.

Bohai Bay, the consultant semi-enclosed bay in northern China, has skilled extreme eutrophication and overfishing in latest a long time. There happens a big eelgrass mattress positioned within the northwest of the eutrophic bay.

Recently, a analysis crew led by Prof. Zhou Yi from the Institute of Oceanology of the Chinese Academy of Sciences (IOCAS) supplied new insights into the variability in Z. marina inhabitants recruitment within the giant seagrass meadow.

The research was printed in Marine Pollution Bulletin on April 7.

The researchers investigated eelgrass shoot density, peak, biomass, plant reproductive effort, and seed financial institution density to investigate the temporal dynamics of asexual development and sexual replica of eelgrass. They additionally recognized the nutrient standing of seawater and seagrass, in addition to their ecological interactions within the giant seagrass meadow.

They discovered that eelgrass seedlings appeared from April to July, and their density reached the very best stage (~220 shoots m-2) in May earlier than lowering. No seedlings had been present in vegetated areas in June 2019, though a substantial variety of seedlings, with a density of about 110 shoots m-2, survived within the eelgrass meadow gaps. Vegetative shoot density considerably elevated throughout autumn sampling interval, with vegetative shoot density rising greater than 4 instances.

“Asexual growth played an important role in the maintenance of existing meadows, and sexual reproduction played a critical role in the colonization of new areas. We suggest that adult eelgrass shoots do rule the fate of seedlings in the large seagrass meadow,” stated Dr. Xu Shaochun, first writer of the research. This discovering will present elementary data for large-scale eelgrass restoration in northern China.

The researchers additionally analyzed nutrient concentrations in seawater and seagrass, and revealed that nutrient assets Nitrogen (N) and Phosphorus (P) at this location had been discovered to satisfy eelgrass development demand. The N/P ratios of seawater and seagrass indicated N limitation relative to P within the eutrophic bay primarily based on the seagrass Redfield ratio (25–30).

“It is likely that the effective nutrient uptake by seagrass plays an important role in reducing the probability of a red tide in the study area,” stated Prof. Zhou, the corresponding writer of the research.

Promising outcomes for eelgrass restoration utilizing sand-capping

More data:
Shaochun Xu et al, Do grownup eelgrass shoots rule seedling destiny in a big seagrass meadow in a eutrophic bay in northern China?, Marine Pollution Bulletin (2022). DOI: 10.1016/j.marpolbul.2022.113499

Adult eelgrass shoots rule seedling destiny in giant seagrass meadow in eutrophic bay of northern China (2022, April 12)
retrieved 12 April 2022

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