Ocean warming combined with nutrient enrichment increases the risk of herbivory during cultivation of the marine macroalga Undaria Pinnatifida

Hikaru Endo, Yoichi Sato, Kenji Kaneko, Daisuke Takahashi, Kazue Nagasawa, Yutaka Okumura, Yukio Agatsuma

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Recent declines of macroalgal forests due to climate change imply that the aquaculture production of macroalgae may also be negatively affected by ocean warming. It has previously been shown that nutrient enrichment can offset the negative impact of warming on the survival and growth of the cultivated macroalga Undaria pinnatifida, although it can also increase the risk of herbivory by unrecognized mesograzers. Observations of several hundreds or thousands of the isopod Cymodocea japonica around U. pinnatifida cultivation ropes in autumn, prompted the analysis of their size-frequency distribution, relationship between body size and consumption rate, and combined effects of elevated temperature and nutrient enrichment on the consumption rate of the algae by the isopod in the current study. Although the body size of the isopods collected in autumn was smaller than those collected in winter and spring, the consumption rate of 600 small isopods was similar to the rate of a large individual. Additionally, the consumption rate doubled in response to an increase in temperature from 15 to 18°C and nutrient enrichment, and tripled with their combination. These results suggest that ocean warming combined with nutrient enrichment increase the risk of herbivory during U. pinnatifida cultivation, especially during isopod outbreak periods.

Original languageEnglish
Pages (from-to)402-409
Number of pages8
JournalICES Journal of Marine Science
Volume78
Issue number1
DOIs
Publication statusPublished - 2021 Jan 1

Keywords

  • interaction between global and local stressors
  • invasive seaweed
  • kelp
  • non-additive effect
  • plant-herbivore interactions

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology

Fingerprint

Dive into the research topics of 'Ocean warming combined with nutrient enrichment increases the risk of herbivory during cultivation of the marine macroalga Undaria Pinnatifida'. Together they form a unique fingerprint.

Cite this