Local and Regional Impacts of Pollution on Coral Reefs along the Thousand Islands North of the Megacity Jakarta, Indonesia

PLoS One. 2015 Sep 17;10(9):e0138271. doi: 10.1371/journal.pone.0138271. eCollection 2015.

Abstract

Worldwide, coral reefs are challenged by multiple stressors due to growing urbanization, industrialization and coastal development. Coral reefs along the Thousand Islands off Jakarta, one of the largest megacities worldwide, have degraded dramatically over recent decades. The shift and decline in coral cover and composition has been extensively studied with a focus on large-scale gradients (i.e. regional drivers), however special focus on local drivers in shaping spatial community composition is still lacking. Here, the spatial impact of anthropogenic stressors on local and regional scales on coral reefs north of Jakarta was investigated. Results indicate that the direct impact of Jakarta is mainly restricted to inshore reefs, separating reefs in Jakarta Bay from reefs along the Thousand Islands further north. A spatial patchwork of differentially degraded reefs is present along the islands as a result of localized anthropogenic effects rather than regional gradients. Pollution is the main anthropogenic stressor, with over 80% of variation in benthic community composition driven by sedimentation rate, NO2, PO4 and Chlorophyll a. Thus, the spatial structure of reefs is directly related to intense anthropogenic pressure from local as well as regional sources. Therefore, improved spatial management that accounts for both local and regional stressors is needed for effective marine conservation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Anthozoa / growth & development*
  • Chlorophyll / metabolism
  • Chlorophyll A
  • Conservation of Natural Resources
  • Coral Reefs
  • Environmental Monitoring / methods
  • Environmental Pollution / adverse effects*
  • Indonesia
  • Islands

Substances

  • Chlorophyll
  • Chlorophyll A

Grants and funding

This study was funded by the German Federal Ministry of Education and Research (BMBF, Grant no. 03F0641A, http://www.bmbf.de/en/) as part of the Science for the Protection of Indonesian Coastal Marine Ecosystems (SPICE) project. The grant was received by AK. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.