Loss and Recovery Potential of Marine Habitats: An Experimental Study of Factors Maintaining Resilience in Subtidal Algal Forests at the Adriatic Sea
Open Access
- 24 May 2010
- journal article
- research article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 5 (5), e10791
- https://doi.org/10.1371/journal.pone.0010791
Abstract
Predicting and abating the loss of natural habitats present a huge challenge in science, conservation and management. Algal forests are globally threatened by loss and severe recruitment failure, but our understanding of resilience in these systems and its potential disruption by anthropogenic factors lags well behind other habitats. We tested hypotheses regarding triggers for decline and recovery potential in subtidal forests of canopy-forming algae of the genus Cystoseira. By using a combination of historical data, and quantitative in situ observations of natural recruitment patterns we suggest that recent declines of forests along the coasts of the north Adriatic Sea were triggered by increasing cumulative impacts of natural- and human-induced habitat instability along with several extreme storm events. Clearing and transplantation experiments subsequently demonstrated that at such advanced stages of ecosystem degradation, increased substratum stability would be essential but not sufficient to reverse the loss, and that for recovery to occur removal of the new dominant space occupiers (i.e., opportunistic species including turf algae and mussels) would be required. Lack of surrounding adult canopies did not seem to impair the potential for assisted recovery, suggesting that in these systems recovery could be actively enhanced even following severe depletions. We demonstrate that sudden habitat loss can be facilitated by long term changes in the biotic and abiotic conditions in the system, that erode the ability of natural ecosystems to absorb and recover from multiple stressors of natural and human origin. Moreover, we demonstrate that the mere restoration of environmental conditions preceding a loss, if possible, may be insufficient for ecosystem restoration, and is scarcely cost-effective. We conclude that the loss of complex marine habitats in human-dominated landscapes could be mitigated with appropriate consideration and management of incremental habitat changes and of attributes facilitating system recovery.Keywords
This publication has 47 references indexed in Scilit:
- Overfishing reduces resilience of kelp beds to climate-driven catastrophic phase shiftProceedings of the National Academy of Sciences of the United States of America, 2009
- Forecasting the limits of resilience: integrating empirical research with theoryProceedings Of The Royal Society B-Biological Sciences, 2009
- Loss, Status and Trends for Coastal Marine Habitats of EuropePublished by Taylor & Francis Ltd ,2007
- Physical disturbance by kelp abrades erect algae from the understoreyMarine Ecology Progress Series, 2006
- Assembly and maintenance of subtidal habitat heterogeneity: synergistic effects of light penetration and sedimentationMarine Ecology Progress Series, 2005
- Spatial variability and human disturbance in shallow subtidal hard substrate assemblages: a regional approachMarine Ecology Progress Series, 2001
- Experimental evidence that Fucus vesiculosus (Phaeophyta) controls filamentous algae by means of the whiplash effectEuropean Journal of Phycology, 1996
- Estimating the abundance of benthic invertebrates:a comparison of procedures and variability between observersMarine Ecology Progress Series, 1996
- The Ecology of Extinctions in Kelp Forest CommunitiesConservation Biology, 1989
- Ecology of Subtidal Algae on Seasonally Devastated Cobble Substrates off GhanaEcology, 1979