Spatial Variability in the Resistance and Resilience of Giant Kelp in Southern and Baja California to a Multiyear Heatwave

In 2014-2016 the west coast of North America experienced a marine heatwave that was unprecedented in the historical record in terms of its duration and intensity. This event was expected to have a devastating impact on populations of giant kelp, an important coastal foundation species found in cool, nutrient rich waters. To evaluate this expectation, we used a time series of satellite imagery to examine giant kelp canopy biomass before, during, and after this heatwave across more than 7 degrees of latitude in southern and Baja California. We examined spatial patterns in resistance, i.e. the initial response of kelp, and resilience, i.e. the abundance of kelp two years after the heatwave ended. The heatwave had a large and immediate negative impact on giant kelp near its southern range limit in Baja. In contrast, the impacts of the heatwave were delayed throughout much of the central portion of our study area, while the northern portions of our study area exhibited high levels of resistance and resilience to the warming, despite large positive temperature anomalies. Giant kelp resistance throughout the entire region was most strongly correlated with the mean temperature of the warmest month of the heatwave, indicating that the loss of canopy was more sensitive to exceeding an absolute temperature threshold than to the magnitude of relative changes in temperature. Resilience was spatially variable and not significantly related to SST metrics or to resistance, indicating that local scale environmental and biotic processes played a larger role in determining the recovery of kelp from this extreme warming event. Our results highlight the resilient nature of giant kelp, but also point to absolute temperature thresholds that are associated with rapid loss of kelp forests.

• Publication year

  2019

• Venue

  Frontiers in Marine Science

• Publication date

  2019-07-23

• Fields of study

  Environmental Science

• Identifiers
  DOI 10.3389/fmars.2019.00413
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

• Three decades of variability in California's giant kelp forests from the Landsat satellites

  2020cited by this paper
• Marine heatwaves threaten global biodiversity and the provision of ecosystem services

  2019cited by this paper
• National prevalence estimates for resistant Enterobacteriaceae and Acinetobacter species in hospitalized patients in the United States.

  2019cited by this paper
• Longer and more frequent marine heatwaves over the past century

  2018cited by this paper
• Loss of foundation species: disturbance frequency outweighs severity in structuring kelp forest communities.

  2018cited by this paper
• Harnessing marine microclimates for climate change adaptation and marine conservation

  2018cited by this paper
• Urea as a source of nitrogen to giant kelp (Macrocystis pyrifera)

  2018cited by this paper
• Correction: Author Correction: Attenuation of RNA polymerase II pausing mitigates BRCA1-associated R-loop accumulation and tumorigenesis

  2018cited by this paper
• Giant kelp, Macrocystis pyrifera, increases faunal diversity through physical engineering

  2018cited by this paper
• Improved estimates of net primary production, growth, and standing crop of Macrocystis pyrifera in Southern California.

  2018cited by this paper
• Fluctuations in population fecundity drive variation in demographic connectivity and metapopulation dynamics

  2017cited by this paper
• Global warming and recurrent mass bleaching of corals

  2017cited by this paper
• A hierarchical approach to defining marine heatwaves

  2016cited by this paper
• The biology and ecology of giant kelp forests.

  2016cited by this paper
• Extreme warming challenges sentinel status of kelp forests as indicators of climate change

  2016cited by this paper
• Multi-year persistence of the 2014/15 North Pacific marine heatwave

  2016cited by this paper
• A long-term record of blended satellite and in situ sea-surface temperature for climate monitoring, modeling and environmental studies

  2016cited by this paper
• A protocol for conducting and presenting results of regression‐type analyses

  2016cited by this paper
• Seascape drivers of Macrocystis pyrifera population genetic structure in the northeast Pacific

  2015cited by this paper
• Geographical variability in the controls of giant kelp biomass dynamics

  2015cited by this paper
• Connectivity structures local population dynamics: a long-term empirical test in a large metapopulation system.

  2015cited by this paper
• Central and rear-edge populations can be equally vulnerable to warming

  2015influential reference
• Causes and impacts of the 2014 warm anomaly in the NE Pacific

  2015cited by this paper
• The Biology and Ecology of Giant Kelp Forests

  2015cited by this paper
• What do you mean, 'resilient'?

  2015cited by this paper
• R: A language and environment for statistical computing.

  2014influential reference
• An extreme climatic event alters marine ecosystem structure in a global biodiversity hotspot

  2013cited by this paper
• Multiple Sources and Forms of Nitrogen Sustain Year-Round Kelp Growth on the Inner Continental Shelf of the Santa Barbara Channel

  2013cited by this paper
• Coral thermal tolerance shaped by local adaptation of photosymbionts

  2012cited by this paper
• Local adaptation in marine invertebrates.

  2011cited by this paper
• Isolation by oceanographic distance explains genetic structure for Macrocystis pyrifera in the Santa Barbara Channel

  2011cited by this paper
• Wave disturbance overwhelms top-down and bottom-up control of primary production in California kelp forests.

  2011cited by this paper
• PHYSIOLOGICAL PERFORMANCE OF FLOATING GIANT KELP MACROCYSTIS PYRIFERA (PHAEOPHYCEAE): LATITUDINAL VARIABILITY IN THE EFFECTS OF TEMPERATURE AND GRAZING 1

  2011cited by this paper
• Environmental controls of giant-kelp biomass in the Santa Barbara Channel, California

  2011cited by this paper
• Climate change cascades: Shifts in oceanography, species' ranges and subtidal marine community dynamics in eastern Tasmania

  2011cited by this paper
• A protocol for data exploration to avoid common statistical problems

  2010cited by this paper
• Habitat continuity and geographic distance predict population genetic differentiation in giant kelp.

  2010cited by this paper
• Beta Regression in R

  2010cited by this paper
• Mixed Effects Models and Extensions in Ecology with R

  2010cited by this paper
• Decreasing resilience of kelp beds along a latitudinal temperature gradient: potential implications for a warmer future.

  2010cited by this paper
• Mixed Effects Models and Extensions in Ecology with R

  2009cited by this paper
• Mixed Effects Models and Extensions in Ecology with R

  2009cited by this paper
• Overfishing reduces resilience of kelp beds to climate-driven catastrophic phase shift

  2009cited by this paper
• Survival of microscopic stages of a perennial kelp (Macrocystis pyrifera) from the center and the southern extreme of its range in the Northern Hemisphere after exposure to simulated El Niño stress

  2007cited by this paper
• GLOBAL ECOLOGY OF THE GIANT KELP MACROCYSTIS : FROM ECOTYPES TO ECOSYSTEMS

  2007influential reference
• Catastrophe, recovery and range limitation in NE Pacific kelp forests: a large-scale perspective

  2006influential reference
• Argonaute—a database for gene regulation by mammalian microRNAs

  2005cited by this paper
• Delayed recovery of giant kelp near its southern range limit in the North Pacific following El Niño

  2005cited by this paper
• Estimating scale-dependency in disturbance impacts: El Niños and giant kelp forests in the northeast Pacific

  2004cited by this paper
• FISHING FOR LOBSTERS INDIRECTLY INCREASES EPIDEMICS IN SEA URCHINS

  2004cited by this paper
• APE: Analyses of Phylogenetics and Evolution in R language

  2004cited by this paper
• EFFECTS OF SELF-FERTILIZATION IN THE GIANT KELP, MACROCYSTIS PYRIFERA

  2004cited by this paper
• Escaping the Bonferroni iron claw in ecological studies

  2004cited by this paper
• A comparison of the 1998 and 2002 coral bleaching events on the Great Barrier Reef: spatial correlation, patterns, and predictions

  2004cited by this paper
• Climate Change, Human Impacts, and the Resilience of Coral Reefs

  2003cited by this paper
• Disturbance Dynamics and Ecological Response: The Contribution of Long-Term Ecological Research

  2003cited by this paper
• Marine reserves demonstrate top-down control of community structure on temperate reefs

  2002cited by this paper
• Biological and chemical consequences of the 1997–1998 El Niño in central California waters

  2002cited by this paper
• GIANT KELP (MACROCYSTIS PYRIFERA, PHAEOPHYCEAE) RECRUITMENT NEAR ITS SOUTHERN LIMIT IN BAJA CALIFORNIA AFTER MASS DISAPPEARANCE DURING ENSO 1997–1998

  1999influential reference
• Controlling the false discovery rate: a practical and powerful approach to multiple testing

  1995cited by this paper
• Temporal and Spatial Patterns of Disturbance and Recovery in a Kelp Forest Community

  1992influential reference
• VARIATION IN NITROGEN PHYSIOLOGY AND GROWTH AMONG GEOGRAPHICALLY ISOLATED POPULATIONS OF THE GIANT KELP, MACROCYSTIS PYRIFERA (PHAEOPHYTA) 1

  1991cited by this paper
• Bottoms Beneath Troubled Waters: Benthic Impacts of the 1982-1984 El Niño in the Temperate Zone

  1990cited by this paper
• The Effects of Variable Settlement and Early Competition on Patterns of Kelp Recruitment

  1990cited by this paper
• In situ recruitment of sporophytes of the giant kelp, Macrocystis pyrifera (L.) C.A. Agardh: Effects of physical factors

  1986cited by this paper
• The Effects of Canopy Shadings on Algal Recruitment and Growth in a Giant Kelp Forest

  1984cited by this paper
• Episodic nutrient supply to a Kelp forest ecosystem in Southern California

  1984influential reference
• The complexity and stability of ecosystems

  1984cited by this paper
• Catastrophic Storms, El Ni�o, and Patch Stability in a Southern California Kelp Community

  1984cited by this paper
• Notes on continuous stochastic phenomena.

  1950cited by this paper

• High-resolution Planet Dove data identify local drivers of kelp canopy persistence

  2026cites this paper
• Climate stress priming of juvenile Southern California giant kelp (Macrocystis pyrifera) to thermal extremes

  2026cites this paper
• Similar sensitivity and resilience to marine heatwaves of giant kelp (Macrocystis pyrifera) sporophytes from the northern and southern edges of their distribution in Aotearoa New Zealand

  2026cites this paper
• Finding common ground: Assessing the Co-location potential of California's blue food and clean energy sectors

  2026cites this paper
• Marine heatwaves as hot spots of climate change and impacts on biodiversity and ecosystem services

  2025cites this paper
• Community-led management maintains higher predator biomass supporting kelp forests persistence in Baja California

  2025cites this paper
• Drivers of kelp forest refugia during successive disturbance events

  2025cites this paper
• Mesophotic thermal refuge modelling shows mitigated reductions in fisheries productivity during marine heatwaves

  2025cites this paper
• Recovery mode: Marine protected areas enhance climate resilience of invertebrate species to marine heatwaves

  2025cites this paper
• Semidiurnal Inner Shelf Flow in the Southern California Bight

  2025cites this paper
• Influence of anthropogenic nutrient sources on kelp canopies during a marine heat wave.

  2025cites this paper
• Comparative photophysiology and respiration of Kelp gametophytes reveals species-specific thermo-tolerance to marine heatwaves

  2025cites this paper
• Decadal changes in California's temperate mesophotic reef invertebrate community through the 2014-2016 northeast Pacific marine heatwave.

  2025cites this paper
• Seasonal and inter-annual dynamics of a Macrocystis pyrifera forest in Concepcion Bay, Chile

  2025cites this paper
• Canopy-forming kelp forests persist in the dynamic subregion of the Broughton Archipelago, British Columbia, Canada

  2025cites this paper
• Drivers of spatiotemporal variability in a marine foundation species

  2025cites this paper
• Connectivity enhances resilience of marine forests after an extreme event

  2025cites this paper
• Predicting heat tolerance in sugar kelp juvenile sporophytes via gametophyte heat stress testing

  2025cites this paper
• Multiscale Analysis of Zooarchaeological Data to Reconstruct Past Kelp Forest Productivity for the Northern Channel Islands, California, U.S.A.

  2025cites this paper
• Geographic variability of floating kelp recovery after a marine heatwave event in the Salish Sea and adjacent open coast

  2025cites this paper
• Global floating kelp forests have limited protection despite intensifying marine heatwave threats

  2025cites this paper
• Marine heatwaves drive range contraction and alternative states of kelp forests at their warm limit

  2025influential citation
• Evidence of local adaptation in Puget Sound’s threatened bull kelp (Nereocystis luetkeana) populations

  2025cites this paper
• Marine protected areas enhance climate resilience to severe marine heatwaves for kelp forests

  2025cites this paper
• Evaluating the design of the first marine protected area network in Pacific Canada under a changing climate

  2024cites this paper
• Local and regional variation in kelp loss and stability across coastal British Columbia

  2024cites this paper
• Self-governance mediates small-scale fishing strategies, vulnerability and adaptive response

  2024cites this paper
• Wave, light, and dissolved oxygen exposures drive novel coastal eelgrass (Zostera pacifica) transplant performance

  2024cites this paper
• Kelp dynamics and environmental drivers in the southern Salish Sea, British Columbia, Canada

  2024cites this paper
• Spatial synchrony cascades across ecosystem boundaries and up food webs via resource subsidies

  2024cites this paper
• Bathymetric origin shapes the physiological responses of Pterygophora californica (Laminariales, Phaeophyceae) to deep marine heatwaves

  2024influential citation
• Bringing heatwaves into the lab: A low‐cost, open‐source, and automated system to simulate realistic warming events in an experimental setting

  2024cites this paper
• Climate change impacts on coastal ecosystems

  2024cites this paper
• Coastal marine heatwaves in the Santa Barbara Channel: decadal trends and ecological implications

  2024cites this paper
• Combining the uncombinable: corporate memories, ethnobiological observations, oceanographic and ecological data to enhance climatic resilience in small-scale fisheries

  2024cites this paper
• Bull kelp (Nereocystis luetkeana) growth rates as climate stress indicators for Canada’s Pacific coast

  2024cites this paper
• Back to the past: long-term persistence of bull kelp forests in the Strait of Georgia, Salish Sea, Canada

  2024cites this paper
• Heat stress analysis suggests a genetic basis for tolerance in Macrocystis pyrifera across developmental stages

  2024cites this paper
• Impacts of Wildfire Runoff on Giant Kelp in Malibu, California

  2024cites this paper
• Shifts in foundation species dominance and altered interaction networks after compounding seismic uplift and extreme marine heatwaves.

  2024cites this paper
• Cross-ecosystem trophic subsidies to sandy beaches support surf zone fish

  2024cites this paper
• Marine heatwave intensity and duration negatively affect growth in young sporophytes of the giant kelp Macrocystis pyrifera

  2024cites this paper
• Impacts of marine heatwaves in coastal ecosystems depend on local environmental conditions

  2024cites this paper
• The ecology of giant kelp colonization and its implications for kelp forest restoration

  2024cites this paper
• Temporal variability of sea surface temperature affects marine macrophytes range retractions as well as gradual warming

  2024cites this paper
• Ocean warming undermines the recovery resilience of New England kelp forests following a fishery-induced trophic cascade.

  2024cites this paper
• When species don’t move together: Non-concurrent range shifts in Eastern Pacific kelp forest communities

  2024cites this paper
• Intensifying marine heatwaves and limited protection threaten global kelp forests

  2024cites this paper
• Long-term climate and hydrologic regimes shape stream invertebrate community responses to a hurricane disturbance.

  2024cites this paper
• Recovery mode: Marine protected areas enhance the resilience of kelp species from marine heatwaves

  2024cites this paper
• Ecosystem Resilience Monitoring and Early Warning Using Earth Observation Data: Challenges and Outlook

  2024cites this paper
• A species distribution model of the giant kelp Macrocystis pyrifera: Worldwide changes and a focus on the Southeast Pacific

  2024influential citation
• Dispersal synchronizes giant kelp forests.

  2024cites this paper
• Herbivore effects increase with latitude across the extent of a foundational seagrass

  2024cites this paper
• Opposing genetic patterns of range shifting temperate and tropical gastropods in an area undergoing tropicalisation

  2023cites this paper
• Examining the Reproductive Success of Bull Kelp (Nereocystis luetkeana) in Climate Change Conditions

  2023cites this paper
• Patterns and drivers of benthic macroinvertebrate assemblages in the kelp forests of southern Patagonia

  2023cites this paper
• Marine protected areas, marine heatwaves, and the resilience of nearshore fish communities

  2023cites this paper
• Small-scale spatiotemporal thermal regimes drive patterns of zooplankton abundance in a kelp forest

  2023cites this paper
• Heatwave restructures marine intertidal communities across a stress gradient.

  2023cites this paper
• Urchin Gonad Response to Kelp Forest Restoration on the Palos Verdes Peninsula, California

  2023cites this paper
• Reliability evaluation of reservoir bank slopes with weak interlayers considering spatial variability

  2023cites this paper
• Persistence of southern California giant kelp beds and alongshore variation in nutrient exposure driven by seasonal upwelling and internal waves

  2023cites this paper
• Shortfalls in the protection of persistent bull kelp forests in the USA

  2023cites this paper
• Securing a Sustainable Future for Kelp Forests INTO THE BLUE

  2023cites this paper
• A tool for detecting giant kelp canopy biomass decline in the Californias

  2023influential citation
• Past climate-driven range shifts structuring intraspecific biodiversity levels of the giant kelp (Macrocystis pyrifera) at global scales

  2023cites this paper
• Variable exposure to multiple climate stressors across the California marine protected area network and policy implications

  2023cites this paper
• Examining the reproductive success of bull kelp (Nereocystis luetkeana, Phaeophyceae, Laminariales) in climate change conditions

  2023cites this paper
• Marine heatwave temperatures enhance larval performance but are meditated by paternal thermal history and inter-individual differences in the purple sea urchin, Strongylocentrotus purpuratus

  2023cites this paper
• Evaluating Habitat Suitability and Tidal Wetland Restoration Actions With ECOSTRESS

  2023cites this paper
• Thermal characteristics of early life stages of Laminaria farlowii, a deep-water kelp from Southern and Central California

  2023cites this paper
• Temperature amplification and marine heatwave alteration in shallow coastal bays

  2023cites this paper
• Dietary Plasticity Mitigates Impacts to Reproduction for the Gull-Billed Tern Gelochelidon nilotica During Abnormally Warm Sea Surface Temperature Events in California, U.S.A.

  2023cites this paper
• Aquatic ecosystems science using an imaging spectrometer

  2023cites this paper
• Applications for Aquatic Remote Sensing and Swat Modeling: Tracking the Wildfire Response of California's Giant Kelp Forests

  2023cites this paper
• Assessment of local adaptation and outbreeding risks in contrasting thermal environments of the giant kelp, Macrocystis pyrifera

  2023cites this paper
• Integrating climate adaptation and transboundary management: Guidelines for designing climate-smart marine protected areas

  2023cites this paper
• Growth and survival of juvenile red abalone (Haliotis rufescens) fed invasive macroalgae

  2023cites this paper
• Ecosystem-based management for kelp forest ecosystems

  2022cites this paper
• Artificial intelligence convolutional neural networks map giant kelp forests from satellite imagery

  2022cites this paper
• Understanding the impact of environmental variability and fisheries on the red sea urchin population in Baja California

  2022cites this paper
• A novel and high‐throughput approach to assess photosynthetic thermal tolerance of kelp using chlorophyll α fluorometry

  2022influential citation
• The Blob marine heatwave transforms California kelp forest ecosystems

  2022cites this paper
• Larval Thermal Tolerance of Kellet's Whelk (Kelletia kelletii) as a Window into the Resilience of a Wild Shellfishery to Marine Heatwaves

  2022cites this paper
• Using unoccupied aerial vehicles to map and monitor changes in emergent kelp canopy after an ecological regime shift

  2022cites this paper
• Marine heatwaves facilitate invasive algae takeover as foundational kelp

  2022cites this paper
• Using a social-ecological systems perspective to identify context specific actions to build resilience in small scale fisheries in Mexico

  2022cites this paper
• Kelpwatch: A new visualization and analysis tool to explore kelp canopy dynamics reveals variable response to and recovery from marine heatwaves

  2022influential citation
• Minimal effects of the 2014-16 marine heatwave on fish assemblages found in eelgrass meadows on the southwestern coast of Vancouver Island, British Columbia, Canada

  2022cites this paper
• The role of inputs of marine wrack and carrion in sandy‐beach ecosystems: a global review

  2022cites this paper
• Marine heatwaves in global sea surface temperature records since 1850

  2022cites this paper
• Gene expression of a canopy‐forming kelp, Eisenia bicyclis (Laminariales, Phaeophyceae), under high temperature stress

  2022cites this paper
• Global biodiversity patterns of marine forests of brown macroalgae

  2022cites this paper
• Kelp Patch-Specific Characteristics Limit Detection Capability of Rapid Survey Method for Determining Canopy Biomass Using an Unmanned Aerial Vehicle

  2022cites this paper
• Disturbance and nutrients synchronise kelp forests across scales through interacting Moran effects

  2022cites this paper
• Influence of kelp forest biomass on nearshore currents

  2022influential citation
• Changes in the feeding habits of the bat ray Myliobatis californica (Gill 1865) during climatic anomalies off the west coast of the Baja California Peninsula, Mexico

  2022cites this paper
• Preparing Aquatic Research for an Extreme Future: Call for Improved Definitions and Responsive, Multidisciplinary Approaches

  2022cites this paper
• A Song of Wind and Ice: Increased Frequency of Marine Cold‐Spells in Southwestern Patagonia and Their Possible Effects on Giant Kelp Forests

  2022cites this paper