Long-Term Changes of Eelgrass, Zostera marina, by Using of Artificial Seeding behind Offshore Breakwater
|
Accession number;06A1017143
|
| Title;Long-Term Changes of Eelgrass, Zostera marina, by Using of Artificial Seeding behind Offshore Breakwater |
| Author;
FUJIWARA MUNEHIRO
(Kagawa Prefect. Fish. Exp. Stn., JPN)
YAMAGA KEN'ICHI
(Kagawa Prefect. Fish. Exp. Stn., JPN)
YOSHIDA GORO
(National Res. Inst. Fisheries and Environment of Inland Sea, Fisheries Res. Agency, JPN)
TERAWAKI TOSHINOBU
(Fisheries Res. Agency, JPN)
|
Journal Title;Fisheries Engineering
|
Journal Code:F0449B
|
ISSN:0916-7617
|
|
VOL.43;NO.2;PAGE.173-177(2006)
|
| Figure&Table&Reference;FIG.5, REF.14 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;In the offshore of Tsuda, Sanuki city of Kagawa Prefecture, natural distribution of eelgrass (Zostera marina) is harshly restricted by wind-induced wave on sea. To understand such restriction of wave, in this research, artificial Z. marina bed was developed and monitored behind offshore breakwater (D.L.-2.5m). For this purpose, in December 1997, Z. marina seeds were packed in gauze seed bags and they were placed inside the seeding area (10*10m). After seed germination, growth and maturation, plants were monitored monthly or bimonthly until March 2005. Seasonal growth of the plants inside the artificial seeding area was similar to that in a natural Z. marina bed in the surroundings offshore. However, it was noticed that distribution of plants never expanded beyond the seeding area during last 7 years of monitoring. Likewise, unusual decrease in the shoot density was observed especially in senescent season (autumn) of some years, which is presumably responsible to obstruct plant distribution and extension. The remarkable decrease in shoot density is possibly provoked by following reasons: 1) high waves and sand movement caused by typhoons in 2001 and 2004, 2) overgrazing by the herbivorous fish (Siganus fuscescens) in 1998, 3) accumulation of drifted algae such as Ulva pertusa (2002) around the experimental area. (author abst.) |
|
|
|
Related Articles;
|
|
