Heike Lotze

Associate Professor

Canada Research Chair in Marine Renewable Resources

Email: heike.lotze@dal.ca


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Recent Submissions

  • Food-Web Structure of Seagrass Communities across Different Spatial Scales and Human Impacts 

    Coll, Marta, Allison Schmidt, Tamara Romanuk, and Heike K. Lotze. 2011. "Food-Web Structure of Seagrass Communities across Different Spatial Scales and Human Impacts." Plos One 6(7): 22591-e22591.
    Seagrass beds provide important habitat for a wide range of marine species but are threatened by multiple human impacts in coastal waters. Although seagrass communities have been well-studied in the field, a quantification ...
  • Loss of large predatory sharks from the Mediterranean Sea 

    Ferretti, Francesco, Ransom A. Myers, Fabrizio Serena, and Heike K. Lotze. 2008. "Loss of large predatory sharks from the Mediterranean Sea." Conservation Biology 22(4): 952-964.
    Evidence for severe declines in large predatory fishes is increasing around the world. Because of its long history of intense fishing, the Mediterranean Sea offers a unique perspective on fish population declines over ...
  • Overestimating Fish Counts by Non-Instantaneous Visual Censuses: Consequences for Population and Community Descriptions 

    Ward-Paige, Christine, Joanna Mills Flemming, and Heike K. Lotze. 2010. "Overestimating Fish Counts by Non-Instantaneous Visual Censuses: Consequences for Population and Community Descriptions." Plos One 5(7): 11722-e11722.
    Background: Increasingly, underwater visual censuses (UVC) are used to assess fish populations. Several studies have demonstrated the effectiveness of protected areas for increasing fish abundance or provided insight into ...
  • The Biodiversity of the Mediterranean Sea: Estimates, Patterns, and Threats 

    Coll, Marta, Chiara Piroddi, Jeroen Steenbeek, Kristin Kaschner, et al. 2010. "The Biodiversity of the Mediterranean Sea: Estimates, Patterns, and Threats." Plos One 5(8): 11842-e11842.
    The Mediterranean Sea is a marine biodiversity hot spot. Here we combined an extensive literature analysis with expert opinions to update publicly available estimates of major taxa in this marine ecosystem and to revise ...
  • Effects of eutrophication, grazing, and algal blooms on rocky shores 

    Worm, Boris, and Heike K. Lotze. 2006. "Effects of eutrophication, grazing, and algal blooms on rocky shores." Limnology and Oceanography 51(1): 569-579.
    Eutrophication can profoundly change rocky shore communities. These changes often cause the replacement of perennial, canopy-forming algae such as Fucus spp. with annual, bloom-forming algae such as Enteromorpha spp. ...
  • Coastal food web structure, carbon storage, and nitrogen retention regulated by consumer pressure and nutrient loading 

    Worm, B., HK Lotze, and U. Sommer. 2000. "Coastal food web structure, carbon storage, and nitrogen retention regulated by consumer pressure and nutrient loading." Limnology and Oceanography 45(2): 339-349.
    By factorial field experiments we analyzed the relative effects of increased nutrient (N+P) loading and natural grazing pressure on species composition, carbon storage, and nitrogen retention in the Baltic Sea littoral ...
  • Global patterns of predator diversity in the open oceans 

    Worm, B., M. Sandow, A. Oschlies, HK Lotze, et al. 2005. "Global patterns of predator diversity in the open oceans." Science 309(5739): 1365-1369.
    The open oceans comprise most of the biosphere, yet patterns and trends of species diversity there are enigmatic. Here, we derive worldwide patterns of tuna and billfish diversity over the past 50 years, revealing distinct ...
  • Algal propagule banks modify competition, consumer and resource control on Baltic rocky shores 

    Worm, B., HK Lotze, and U. Sommer. 2001. "Algal propagule banks modify competition, consumer and resource control on Baltic rocky shores." Oecologia 128(2): 281-293.
    We hypothesized that supply from macroalgal propagule banks may influence the relative abundance of annual and perennial algae and that this may alter the effects of grazers and nutrients on species composition. In a ...
  • Consumer versus resource control of species diversity and ecosystem functioning 

    Worm, B., HK Lotze, H. Hillebrand, and U. Sommer. 2002. "Consumer versus resource control of species diversity and ecosystem functioning." Nature 417(6891): 848-851.
    A key question in ecology is which factors control species diversity in a community(1-3). Two largely separate groups of ecologists have emphasized the importance of productivity or resource supply, and consumers or physical ...
  • Predator diversity hotspots in the blue ocean 

    Worm, B., HK Lotze, and RA Myers. 2003. "Predator diversity hotspots in the blue ocean." Proceedings of the National Academy of Sciences of the United States of America 100(17): 9884-9888.
    Concentrations of biodiversity, or hotspots, represent conservation priorities in terrestrial ecosystems but remain largely unexplored in marine habitats. In the open ocean, many large predators such as tunas, sharks, ...
  • Structural degradation in Mediterranean Sea food webs: Testing ecological hypotheses using stochastic and mass-balance modelling 

    Coll, Marta, Heike K. Lotze, and Tamara N. Romanuk. 2008. "Structural degradation in Mediterranean Sea food webs: Testing ecological hypotheses using stochastic and mass-balance modelling." Ecosystems 11(6): 939-960.
    Human-mediated disturbances such as fishing, habitat modification, and pollution have resulted in significant shifts in species composition and abundance in marine ecosystems which translate into degradation of food-web ...
  • Rebuilding Global Fisheries 

    Worm, Boris, Ray Hilborn, Julia K. Baum, Trevor A. Branch, et al. 2009. "Rebuilding Global Fisheries." Science 325(5940): 578-585.
    After a long history of overexploitation, increasing efforts to restore marine ecosystems and rebuild fisheries are under way. Here, we analyze current trends from a fisheries and conservation perspective. In 5 of 10 ...
  • Impacts of biodiversity loss on ocean ecosystem services 

    Worm, Boris, Edward B. Barbier, Nicola Beaumont, J. Emmett Duffy, et al. 2006. "Impacts of biodiversity loss on ocean ecosystem services." Science 314(5800): 787-790.
    Human-dominated marine ecosystems are experiencing accelerating loss of populations and species, with largely unknown consequences. We analyzed local experiments, long-term regional time series, and global fisheries data ...
  • Evaluating the knowledge base for expanding low-trophic-level fisheries in Atlantic Canada 

    Anderson, Sean C., Heike K. Lotze, and Nancy L. Shackell. 2008. "Evaluating the knowledge base for expanding low-trophic-level fisheries in Atlantic Canada." Canadian Journal of Fisheries and Aquatic Sciences 65(12): 2553-2571.
    Over the last two decades, low-trophic-level fisheries have rapidly expanded in Atlantic Canada, largely compensating for collapsed groundfisheries; however, concerns have been raised regarding the limited background ...
  • In situ nutrient enrichment: Methods for marine benthic ecology 

    Worm, B., TBH Reusch, and H. K. Lotze. 2000. "In situ nutrient enrichment: Methods for marine benthic ecology." International Review of Hydrobiology 85(2-3): 359-375.
    Nutrient enrichment of marine sediments or the water column has been used to study plant nutrient limitation and its cascading effects on community structure. Here we develop methodological recommendations for in situ ...
  • Response to comments on "Impacts of biodiversity loss on ocean ecosystem services" 

    Worm, Boris, Edward B. Barbier, Nicola Beaumont, J. Emmett Duffy, et al. 2007. "Response to comments on "Impacts of biodiversity loss on ocean ecosystem services"." Science 316(5829): 1285-1286.
    No abstract available.
  • Biodiversity loss in the ocean: How bad is it? Response 

    Worm, Boris, Edward B. Barbier, Nicola Beaumont, J. Emmett Duffy, et al. 2007. "Biodiversity loss in the ocean: How bad is it? Response." Science 316(5829): 1282-1284.
    No abstract available.
  • Spatial and temporal trends in yellow stingray abundance: evidence from diver surveys 

    Ward-Paige, Christine A., Christy Pattengill-Semmens, Ransom A. Myers, and Heike K. Lotze. 2011. "Spatial and temporal trends in yellow stingray abundance: evidence from diver surveys." Environmental Biology of Fishes 90(3): 263-276.
    Recent concerns about changing elasmobranch populations have prompted the need to understand their patterns of distribution and abundance through non-destructive sampling methods. Since scientific divers represent a small ...
  • Serial exploitation of global sea cucumber fisheries 

    Anderson, Sean C., Joanna Mills Flemming, Reg Watson, and Heike K. Lotze. 2011. "Serial exploitation of global sea cucumber fisheries." Fish and Fisheries 12(3): 317-339.
    In recent decades, invertebrate fisheries have expanded in catch and value worldwide. One increasingly harvested group is sea cucumbers (class Holothuroidea), which are highly valued in Asia and sold as trepang or beche-de-mer. ...
  • Regional-scale effects of eutrophication on ecosystem structure and services of seagrass beds 

    Schmidt, Allison L., Jessica K. C. Wysmyk, Susanne E. Craig, and Heike K. Lotze. 2012. "Regional-scale effects of eutrophication on ecosystem structure and services of seagrass beds." Limnology and Oceanography 57(5): 1389-1402.
    Using large-scale field surveys across 12 estuaries in two provinces in Atlantic Canada, we analyzed changes in phytoplankton and benthic macroalgal communities as well as the canopy structure of eelgrass beds and quantified ...

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