Simulated green turtle grazing alters effects of environmental drivers on seagrass growth dynamics across seasons
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

For very narrow results

When looking for a specific result

Best used for discovery & interchangable words

Recommended to be used in conjunction with other fields

Dates

to

Document Data
Library
People
Clear All
Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Simulated green turtle grazing alters effects of environmental drivers on seagrass growth dynamics across seasons

Filetype[PDF-1.49 MB]



Details:

  • Journal Title:
    Limnology and Oceanography
  • Personal Author:
  • NOAA Program & Office:
  • Description:
    Seagrasses form productive marine ecosystems that serve as important foraging grounds for grazers. Meadow productivity is vulnerable to environmental change, however, because environmental factors often strongly regulate seagrass growth. Understanding effects of grazing and environmental driver interactions on growth dynamics is therefore needed to ensure the long‐term sustainability of seagrass meadow foraging habitats. We simulated natural green turtle (Chelonia mydas) grazing by experimentally clipping seagrass for 16 months in a Thalassia testudinum meadow and measured how responses in linear growth, production, the production‐to‐biomass ratio (P : B; compensatory growth), and leaf area index differed between clipped and unclipped seagrass in response to in situ changes in temperature and salinity. While increasing temperature and salinity had positive and negative effects, respectively, on growth rates, clipping did not alter the relationship between these abiotic drivers and seagrass growth. Simulated grazing did, however, alter effects of temperature on seagrass P : B ratio and leaf area index dynamics. Each increased significantly with temperature; however, P : B ratios only increased in experimentally clipped seagrass, whereas leaf area index only increased in unclipped seagrass. These results suggest that, given temperature‐stimulated growth, grazed seagrass prioritizes increasing biomass production, whereas ungrazed seagrass prioritizes increasing photosynthetic surface area. In addition, our results demonstrate that the strength of the compensatory growth response to grazing in T. testudinum is seasonally dependent, highlighting the importance of biotic‐abiotic interactions in driving growth dynamics. In a future with increasing grazer abundance and climate‐driven stressors, understanding these types of interactions will be critical for long‐term sustainability of seagrass ecosystems.
  • Keywords:
  • Source:
    Limnology and Oceanography, 67(12), 2635-2648
  • DOI:
  • ISSN:
    0024-3590;1939-5590;
  • Format:
  • Publisher:
  • Document Type:
  • License:
  • Rights Information:
    CC BY
  • Compliance:
    Library
  • Main Document Checksum:
  • Download URL:
  • File Type:

You May Also Like

Checkout today's featured content at repository.library.noaa.gov

Version 3.26.1