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 ...
  • 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 ...
  • 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 ...
  • Assessing the Value of Recreational Divers for Censusing Elasmobranchs 

    Ward-Paige, Christine A., and Heike K. Lotze. 2011. "Assessing the Value of Recreational Divers for Censusing Elasmobranchs." Plos One 6(10): 25609-e25609.
    Background: Around the world, researchers are using the observations and experiences of citizens to describe patterns in animal populations. This data is often collected via ongoing sampling or by synthesizing past ...
  • Large-Scale Absence of Sharks on Reefs in the Greater-Caribbean: A Footprint of Human Pressures 

    Ward-Paige, Christine A., Camilo Mora, Heike K. Lotze, Christy Pattengill-Semmens, et al. 2010. "Large-Scale Absence of Sharks on Reefs in the Greater-Caribbean: A Footprint of Human Pressures." Plos One 5(8): 11968-e11968.
    Background: In recent decades, large pelagic and coastal shark populations have declined dramatically with increased fishing; however, the status of sharks in other systems such as coral reefs remains largely unassessed ...
  • Two centuries of multiple human impacts and successive changes in a North Atlantic food web 

    Lotze, Heike K., and Inka Milewski. 2004. "Two centuries of multiple human impacts and successive changes in a North Atlantic food web." Ecological Applications 14(5): 1428-1447. Copyright by the Ecological Society of America
    European colonization of North America, severely altered terrestrial and aquatic ecosystems alike. Here, we integrate archaeological, historical, and recent data to derive the ecological history of the Quoddy Region, Bay ...
  • Strong bottom-up and top-down control of early life stages of macroalgae 

    Lotze, Heike K., Boris Worm, and Ulrich Sommer. 2001. "Strong bottom-up and top-down control of early life stages of macroalgae." Limnology and Oceanography 46(4): 749-757.
    In contrast to most pelagic primary producers, benthic macrophytes pass through morphologically distinct life stages, which can be subject to different ecological controls. Using factorial field experiments, we investigated ...
  • Rapid Global Expansion of Invertebrate Fisheries: Trends, Drivers, and Ecosystem Effects 

    Anderson, Sean C., Joanna Mills Flemming, Reg Watson, and Heike K. Lotze. 2011. "Rapid Global Expansion of Invertebrate Fisheries: Trends, Drivers, and Ecosystem Effects." Plos One 6(3): 14735-e14735.
    Background: Worldwide, finfish fisheries are receiving increasing assessment and regulation, slowly leading to more sustainable exploitation and rebuilding. In their wake, invertebrate fisheries are rapidly expanding with ...
  • Complex interactions of climatic and ecological controls on macroalgal recruitment. 

    Lotze, Heike K., and Boris Worm. 2002. "Complex interactions of climatic and ecological controls on macroalgal recruitment.." Limnology and Oceanography 47(6): 1734-1741.
    Little is known about the cumulative effects of multiple (>2) environmental controls on species performance and interactions in aquatic ecosystems. We asked how changes in climatic (temperature, ultraviolet radiation) and ...
  • Long-term change in a meso-predator community in response to prolonged and heterogeneous human impact 

    Ferretti, Francesco, Giacomo C. Osio, Chris J. Jenkins, Andrew A. Rosenberg, et al. 2013. "Long-term change in a meso-predator community in response to prolonged and heterogeneous human impact." Scientific Reports 3: 1057-1057.
    Sharks and rays' abundance can decline considerably with fishing. Community changes, however, are more complex because of species interactions, and variable vulnerability and exposure to fishing. We evaluated long-term ...