Large-Scale Degradation of a Kelp Ecosystem in an Ocean Warming Hotspot

Authors

Karen Filbee-Dexter, Dalhousie University
Colette Feehan, Montclair State UniversityFollow
Robert E. Scheibling, Dalhousie University

Document Type

Article

Publication Date

2-3-2016

Journal / Book Title

Marine Ecology Progress Series

Abstract

Understanding the impacts of climate change on biological systems requires observational data over multi-decadal time spans and broad spatial scales. Extensive research at an ocean warming hotspot off Nova Scotia, Canada, enabled us to evaluate the impact of 3 decades of observed temperature rise on a coastal marine ecosystem. Here, we document changes in the kelp community from sites monitored since 1949, 1968 and 1984, and from coastal surveys in 1982, 2000, 2007 and 2014. We show that mean kelp biomass has declined by 85-99% over the past 4-6 decades, and a catastrophic phase shift has occurred from luxuriant kelp beds to rocky reefs dominated by opportunistic turf-forming and invasive algae. This shift likely represents a persistent change, driven by multiple biotic and abiotic interactions, with positive feedback mechanisms (e.g. sediment accumulation) that stabilize the invasive/turf-algal state. This study is the first to show multi-decadal declines in kelp related to warming temperatures in the Northwest Atlantic. The large-scale degradation of an important coastal ecosystem within a warming hotspot presents a troubling example of the instability of marine systems in a rapidly changing ocean environment.

Comments

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DOI

10.3354/meps11554

Montclair State University Digital Commons Citation

Filbee-Dexter, Karen; Feehan, Colette; and Scheibling, Robert E., "Large-Scale Degradation of a Kelp Ecosystem in an Ocean Warming Hotspot" (2016). Department of Biology Faculty Scholarship and Creative Works. 359.
https://digitalcommons.montclair.edu/biology-facpubs/359

Published Citation

Filbee-Dexter K, Feehan CJ, Scheibling RE (2016) Large-scale degradation of a kelp ecosystem in an ocean warming hotspot. Mar Ecol Prog Ser 543:141-152. https://doi.org/10.3354/meps11554