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Margot Hessing-Lewis

Margot Hessing-Lewis
Hakai Institute · Nearshore Marine Ecology

About

46
Publications
12,032
Reads
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748
Citations
Citations since 2016
34 Research Items
601 Citations
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2016201720182019202020212022050100150200
Introduction
Margot Hessing-Lewis is a marine ecologist working with the Hakai Institute. Their most recent publication is 'Anthropogenic disturbance homogenizes seagrass fish communities'.
Additional affiliations
July 2014 - present
Hakai Institute
Position
  • Researcher
Education
September 2005 - September 2011
Oregon State University
Field of study
  • Marine Ecology
September 2003 - September 2005
Queen's University
Field of study
  • Geography
September 1998 - September 2001
McGill University
Field of study
  • Biology

Publications

Publications (46)
Article
Full-text available
In seagrass food webs, small invertebrate mesograzers often exert top-down control on algal epiphytes growing on seagrass blades, which in turn releases the seagrass from competition for light and nutrients. Yet, nearshore habitat boundaries are permeable, and allochthonous subsidies can provide alternative food sources to in-situ production in sea...
Article
Full-text available
The roles of marine microbiomes in disease remain poorly understood due, in part, to the challenging nature of sampling at appropriate spatiotemporal scales and across natural gradients of disease throughout host ranges. This is especially true for marine vascular plants like eelgrass ( Zostera marina ) that are vital for ecosystem function and bio...
Article
Full-text available
Ocean warming endangers coastal ecosystems through increased risk of infectious disease, yet detection, surveillance, and forecasting of marine diseases remain limited. Eelgrass (Zostera marina) meadows provide essential coastal habitat and are vulnerable to a temperature‐sensitive wasting disease caused by the protist Labyrinthula zosterae. We ass...
Article
Full-text available
Kelp forests are commonly classified within remote sensing imagery by contrasting the high reflectance in the near-infrared spectral region of kelp canopy floating at the surface with the low reflectance in the same spectral region of water. However, kelp canopy is often submerged below the surface of the water, making it important to understand th...
Article
Transitioning to a Blue Economy that prioritizes social equity will be challenging in ocean sectors but could be comparatively easier for newer industries where appropriate guidelines can be followed from the start. We focus here on two emerging ocean sectors—blue carbon and ocean energy—and an evaluation of benefit-sharing agreements at operationa...
Article
Full-text available
The 2013-2016 northeast Pacific Ocean marine heatwave (MHW) had myriad impacts on marine communities, but little is known about how this event affected coastal estuaries. We examined the extent to which elevated temperatures associated with the offshore MHW were observed in four estuaries (Willapa Bay, Washington and Netarts Bay, Yaquina Bay, and C...
Article
In aquatic foundation species, composition and abundance of associated epibionts can change substantially over small spatial distances. Such spatial variation can reflect top-down control by consumers, bottom-up control by abiotic factors or facilitation, or a combination of processes. We used visual and molecular surveys to describe spatial patter...
Article
Full-text available
Surface-canopy forming kelps provide the foundation for ecosystems that are ecologically, culturally, and economically important. However, these kelp forests are naturally dynamic systems that are also threatened by a range of global and local pressures. As a result, there is a need for tools that enable managers to reliably track changes in their...
Article
The importance of disturbance Work in sea otters over the last few decades has transformed our understanding of the importance of specific species, or keystones, as drivers of community structure and stability. Foster et al . took the next step and tested whether otter foraging might influence genetic diversity in an eelgrass ecosystem (see the Per...
Article
Full-text available
Alongside the steep reductions needed in fossil fuel emissions, natural climate solutions (NCS) represent readily deployable options that can contribute to Canada’s goals for emission reductions. We estimate the mitigation potential of 24 NCS related to the protection, management, and restoration of natural systems that can also deliver numerous co...
Preprint
Full-text available
Underwater kelp forests have provided valuable ecosystem services for millennia. However, the global economic value of those services is largely unresolved. Kelp forests are also diminishing globally and efforts to manage these valuable resources are hindered without accurate estimates of the services kelp forests provide to society. We present the...
Article
Full-text available
The seagrass Zostera marina is a widespread foundational species in temperate coastal ecosystems that supports diverse communities of epiphytes and grazers. Bacteria link the production of seagrass to higher trophic levels and are thought to influence seagrass biology and health. Yet, we lack a clear understanding of the factors that structure the...
Article
Full-text available
Unoccupied Aerial Vehicles (UAVs), or drone technologies, with their high spatial resolution, temporal flexibility, and ability to repeat photogrammetry, afford a significant advancement in other remote sensing approaches for coastal mapping, habitat monitoring, and environmental management. However, geographical drone mapping and in situ fieldwork...
Article
Aim Studies on latitudinal patterns in plant defence have traditionally overlooked the potential effect that resource availability may have in shaping plant defence. Likewise, latitudinal patterns of tolerance traits have rarely been studied, yet they can be a critical component of plant defence. Therefore, the aim of our study was to examine latit...
Article
Full-text available
The global distribution of primary production and consumption by humans (fisheries) is well-documented, but we have no map linking the central ecological process of consumption within food webs to temperature and other ecological drivers. Using standardized assays that span 105° of latitude on four continents, we show that rates of bait consumption...
Article
Epibiotic microorganisms link seagrass productivity to higher trophic levels, but little is known about the processes structuring these communities, and which taxa consistently associate with seagrass. We investigated epibiotic microeukaryotes on seagrass (Zostera marina) leaves, substrates and planktonic microeukaryotes in ten meadows in the North...
Article
Full-text available
There is increasing urgency to implement climate change mitigation strategies that enhance greenhouse gas removal from the atmosphere and reduce carbon dioxide (CO2) emissions. Recently, coastal “blue carbon” habitats⁠—mangroves, salt marshes, and seagrass meadows—have received attention for their ability to capture CO2 and store organic carbon (OC...
Article
Full-text available
Recovering species are often limited to much smaller areas than they historically occupied. Conservation planning for the recovering species is often based on this limited range, which may simply be an artifact of where the surviving population persisted. Southern sea otters (Enhydra lutris nereis) were hunted nearly to extinction but recovered fro...
Article
Full-text available
Unanticipated declines among exploited species have commonly occurred despite harvests that appeared sustainable prior to collapse. This is particularly true in the oceans where spatial scales of management are often mismatched with spatially complex metapopulations. We explore causes, consequences and potential solutions for spatial mismatches in...
Article
We analysed the carbon stable isotope (δ 13 C) of various organic carbon sources, including particulate organic matter (POM), sediment organic matter (SOM), seagrass and its epiphytes, and compared these results with that of 36 fishes, including 27 types of demersal fishes, 6 types of midwater fishes, and 3 types of surface fishes. Our results indi...
Article
The term ‘Blue Economy’ is increasingly used in various marine sectors and development frameworks. For it to be a truly useful approach, however, we argue that social benefits and equity must be explicitly prioritized alongside environmental and economic concerns. This integration of social dimensions within the Blue Economy is required to ensure t...
Article
Aquatic ecosystems have been managed for millennia. Indigenous communities in North America pioneered numerous marine resource management strategies to ensure food security and support thriving economies, which have been active throughout the Northwest Coast of North America for over 14 000 years. Developed to increase shellfish productivity, clam...
Article
Aquatic ecosystems have been managed for millennia. Indigenous communities in North America pioneered numerous marine resource management strategies to ensure food security and support thriving economies, which have been active throughout the Northwest Coast of North America for over 14 000 years. Developed to increase shellfish productivity, clam...
Article
Full-text available
The complex coastline that stretches from Southeast Alaska to the Salish Sea hosts an expansive and verdant bathtub ring of seagrasses. Their presence is facilitated by the geographic complexity of the region, which promotes a variety of suitable substrates that are appropriate for seagrass recruitment (mud to sands to rock within small spatial sca...
Article
Full-text available
Organic carbon (OC) storage in coastal vegetated ecosystems is increasingly being considered in carbon financing and climate change mitigation strategies. However, spatial heterogeneity in these “blue carbon” stocks among and within habitats has only recently been examined, despite its considerable implications. Seagrass meadows have potential to s...
Article
Diverse habitats composing coastal seascapes occur in close proximity, connected by the flux of materials and fauna across habitat boundaries. Understanding how seascape connectivity alters important ecosystem functions for fish, however, is not well established. For a seagrass‐dominant seascape, we predicted that configuration and composition of a...
Article
Full-text available
There is growing interest in the use of Unoccupied Aerial Systems (UAS) for mapping and monitoring of seagrass habitats. UAS provide flexibility with timing of imagery capture, are relatively inexpensive, and obtain very high spatial resolution imagery compared to imagery acquired from sensors mounted on satellite or piloted aircraft. However, rese...
Preprint
Full-text available
Unanticipated declines among exploited species frequently occur despite harvests that appear sustainable. This is common in the oceans, where spatial scales of management can be mismatched with spatially dynamic metapopulations. We explore causes, consequences and potential solutions for spatial mismatches in metapopulations of an important forage...
Article
Full-text available
Anthropogenic activities have led to the biotic homogenization of many ecological communities, yet in coastal systems this phenomenon remains understudied. In particular, activities that locally affect marine habitat-forming foundation species may perturb habitat and promote species with generalist, opportunistic traits, in turn affecting spatial p...
Article
Comparing sea otter recovery in California (CA) and British Columbia (BC) reveals key ecosystem properties that shape top-down effects in seagrass communities. We review potential ecosystem drivers of sea otter foraging in CA and BC seagrass beds, including the role of coastline complexity and environmental stress on sea otter effects. In BC, we fi...
Article
• Low trophic‐level forage fish are experiencing global declines, influencing coupled human–ocean systems worldwide. Along the northwest coast of North America, declining trajectories of Pacific herring (Clupea pallasii) have prompted interest in improving the understanding of its population and community dynamics to better guide future conservatio...
Article
Knowledge of nutrient pathways and their resulting ecological interactions can alleviate numerous environmental problems associated with nutrient increases in both natural and managed systems. Although not unique, coastal systems are particularly prone to complex ecological interactions resulting from nutrient inputs from both the land and sea. Nut...
Article
In coastal marine systems worldwide, land-based nutrient inputs are often correlated with blooms of macroalgae, which can negatively affect seagrass habitats. We used spatiotemporal trends in production to identify the role of marine-derived nutrients in mediating these interactions. Among ocean upwelling-influenced estuaries along the northeastern...
Conference Paper
Background/Question/Methods Pacific herring (Clupea pallasi) are integral to coastal social-ecological systems in North America. This migratory species connects marine ecosystems by moving from offshore to nearshore waters for annual spawning events, providing a key source of food for coastal predators, and supporting subsistence and commercial f...
Conference Paper
Pacific herring (Clupea pallasi) are an integral component of temperate marine ecosystems in North America. This migratory species connects marine ecosystems by moving from offshore to nearshore waters for annual spawning events. In doing so, this commercial fish stock provides a key source of food for coastal predators, and supports subsistence an...
Article
Land-based eutrophication is often associated with blooms of green macroalgae, resulting in negative impacts on seagrasses. The generality of this interaction has not been studied in upwelling-influenced estuaries where oceanic nutrients dominate seasonally. We conducted an observational and experimental study with Zostera marina L. and ulvoid macr...
Article
Full-text available
A congener comparison of native (Zostera marina) and introduced (Zostera japonica) eelgrasses was conducted in Willapa Bay, Washington, USA. Along intertidal transects, Z. japonica (0.1-1.5 m above mean lower low water [MLLW]) occurred above Z. marina (<0.6 m MLLW). Both species declined in shoot length at higher elevation, but Z. japonica was alwa...
Article
The search for generality in ecology should include assessing the influence of studies done in one system on those done in other systems. Assuming generality is reflected in citation patterns, we analyzed frequencies of terrestrial, marine, and freshwater citations in papers categorized as terrestrial, marine and freshwater in high-impact “general”...
Conference Paper
Background/Question/Methods In estuaries worldwide, macroalgae blooms fueled by land-based nutrient loading have been associated with declining seagrass populations. In Coos Bay, Oregon, strong summer upwelling leads to estuarine systems dominated by marine nutrients. These marine-dominated nutrient conditions are associated with high seasonal pro...
Conference Paper
Background/Question/Methods The search for generality in ecology should include assessing the influence of studies done in one system on those done in other systems. Assuming that this form of generality, here termed “habitat” generality, would be expressed in citations of research papers, we sampled and analyzed frequencies of terrestrial, marine...
Article
Sea breezes often have significant impacts on nearshore physical and biological processes. We document the effects of a diurnal sea breeze on the nearshore thermal structure and circulation of northern Monterey Bay, California, using an array of moorings during the summer upwelling season in 2006. Moorings were equipped with thermistors and Acousti...

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