Restoration Project

Pusan National University - Samcheok-si

Restoration Objective:

As part of an effort to evaluate structural and functional recovery of created and restored habitat, the macroalgal community and food web structure were studied about a year after the establishment of an artificial macroalgal bed, and comparisons were made with nearby natural counterparts and barren ground communities.

Cause Of Decline:

Loss of macroalgal habitat appears to be widespread on the coast of the Korean peninsula and macroalgae has almost disappeared at some localities. The term ‘‘isoyake’’ was coined to refer to decreases in macroalgae in the Japanese coastal zones. Patterns and processes of algal decline or kelp deforestation at different geographical regions include; physiological stress and thereby disease; oceanographic anomalies in temperature, salinity or nutrients; grazing by herbivorous sea urchins; climate change; trophic cascade effects due to changes in coastal biodiversity; and declines in water quality.

Key Reasons For Decline:

Multiple

Scientific Paper

Food web structure of a restored macroalgal bed in the eastern Korean peninsula determined by C and N stable isotope analyses

C.K. Kang, E.J. Choy, Y.S. Son, J.Y. Lee, J.K. Kim, Y. D., K.S. Lee, , Marine Biology, Vol. 153.https://doi.org/10.1007/s00227-007-0890-y

Organisation:

Pusan National University

Site Observations:

Observation Date

1st Oct 2003 – 1st Apr 2005

Action Summary:

Macroalgae, epilithic microalgae, benthic invertebrates and fish were sampled seasonally throughout 2005 at three sites from natural and restored (artificial reefs) macroalgal beds and barren grounds. The composition and abundance of macroalgae was measured and Stable Isotope Analysis was used to determine isotopic signatures of consumers.

Lessons Learned:

The size of the natural macroalgal site and barren grounds used for comparison with the artificial reef site was unclear. The study could have used more than one type of each habitat for comparison, and provided a description of the habitats. Stable Isotope Analysis is an innovative approach to measuring restoration success by comparing diets and trophic levels between restored and natural sites.

Project Outcomes:

37 macroalgal taxa composed of five green, eight brown, and 24 red algae were found at three sites during the study period. The eight top-ranked macroalgal species were very similar at natural and restored bed sites based on their relative contribution to total biomass. 13C and 15N values of consumers were very similar between restored and natural beds but varied between functional feeding groups. Overall, results revealed the recoveries of the macroalgal community and trophic structure at the restored habitat.

Key Reasons For Decline:

Multiple

Area of Restoration (In Square Metres)

100

Indicator Data:

Indicator:

Ending Value:

Starting Value:

Wet Weight Kelp

28.3
g WW/m2
0
g WW/m2
Costings:
Cost Currency:USD

Observation Date

1st Oct 2003 – 1st Apr 2005

Action Summary:

Macroalgae, epilithic microalgae, benthic invertebrates and fish were sampled seasonally throughout 2005 at three sites from natural and restored (artificial reefs) macroalgal beds and barren grounds. The composition and abundance of macroalgae was measured and Stable Isotope Analysis was used to determine isotopic signatures of consumers.

Lessons Learned:

The size of the natural macroalgal site and barren grounds used for comparison with the artificial reef site was unclear. The study could have used more than one type of each habitat for comparison, and provided a description of the habitats. Stable Isotope Analysis is an innovative approach to measuring restoration success by comparing diets and trophic levels between restored and natural sites.

Project Outcomes:

37 macroalgal taxa composed of five green, eight brown, and 24 red algae were found at three sites during the study period. The eight top-ranked macroalgal species were very similar at natural and restored bed sites based on their relative contribution to total biomass. 13C and 15N values of consumers were very similar between restored and natural beds but varied between functional feeding groups. Overall, results revealed the recoveries of the macroalgal community and trophic structure at the restored habitat.

Key Reasons For Decline:

Multiple

Area of Restoration (In Square Metres)

100

Indicator Data:

Indicator:

Ending Value:

Starting Value:

Wet Weight Kelp

235.2
g WW/m2
0
g WW/m2
Costings:
Cost Currency:USD