@article{allgeier_andskog_hensel_appaldo_layman_kemp_2020, title={Rewiring coral: Anthropogenic nutrients shift diverse coral-symbiont nutrient and carbon interactions toward symbiotic algal dominance}, volume={26}, ISSN={["1365-2486"]}, DOI={10.1111/gcb.15230}, abstractNote={AbstractImproving coral reef conservation requires heightened understanding of the mechanisms by which coral cope with changing environmental conditions to maintain optimal health. We used a long‐term (10 month) in situ experiment with two phylogenetically diverse scleractinians (Acropora palmata and Porites porites) to test how coral–symbiotic algal interactions changed under real‐world conditions that were a priori expected to be beneficial (fish‐mediated nutrients) and to be harmful, but non‐lethal, for coral (fish + anthropogenic nutrients). Analyzing nine response variables of nutrient stoichiometry and stable isotopes per coral fragment, we found that nutrients from fish positively affected coral growth, and moderate doses of anthropogenic nutrients had no additional effects. While growing, coral maintained homeostasis in their nutrient pools, showing tolerance to the different nutrient regimes. Nonetheless, structural equation models revealed more nuanced relationships, showing that anthropogenic nutrients reduced the diversity of coral–symbiotic algal interactions and caused nutrient and carbon flow to be dominated by the symbiont. Our findings show that nutrient and carbon pathways are fundamentally “rewired” under anthropogenic nutrient regimes in ways that could increase corals’ susceptibility to further stressors. We hypothesize that our experiment captured coral in a previously unrecognized transition state between mutualism and antagonism. These findings highlight a notable parallel between how anthropogenic nutrients promote symbiont dominance with the holobiont, and how they promote macroalgal dominance at the coral reef scale. Our findings suggest more realistic experimental conditions, including studies across gradients of anthropogenic nutrient enrichment as well as the incorporation of varied nutrient and energy pathways, may facilitate conservation efforts to mitigate coral loss.}, number={10}, journal={GLOBAL CHANGE BIOLOGY}, author={Allgeier, Jacob E. and Andskog, Mona A. and Hensel, Enie and Appaldo, Richard and Layman, Craig and Kemp, Dustin W.}, year={2020}, month={Oct}, pages={5588–5601} } @article{hensel_allgeier_layman_2019, title={Effects of predator presence and habitat complexity on reef fish communities in The Bahamas}, volume={166}, ISSN={["1432-1793"]}, DOI={10.1007/s00227-019-3568-3}, number={10}, journal={MARINE BIOLOGY}, author={Hensel, Enie and Allgeier, Jacob E. and Layman, Craig A.}, year={2019}, month={Oct} } @article{hensel_wenclawski_layman_2018, title={Using a small, consumer-grade drone to identify and count marine megafauna in shallow habitats}, volume={46}, ISSN={["0717-7178"]}, DOI={10.3856/vol46-issue5-fulltext-15}, abstractNote={Large-bodied animals, megafauna, are disproportionately threatened and yet, remain relatively difficult to monitor, particularly true in the ocean. Consumer-grade drones have high definition imagery and offer a non-invasive way to monitor a subset of marine megafauna, especially those species that spend part of their life near the water’s surface. However, a key question is the extent to which drone imagery data offer reliable abundance estimates due to potential detection restraints, and the ability to compare data from different locations. Here we tested the efficacy of a quadcopter drone to collect megafauna abundance data in multiple shallow-water habitats in the realistic background variation of shoreline development. On Great Abaco Island, The Bahamas we repeated drone surveys in nearshore habitats from June to August 2015 at three paired high and low human population sites. We tested the drone's detection probability using decoy organisms and found no effect of water quality or benthic characteristics on detectability. In short, the drones appear to work to monitor these species. We also noted patterns in the occupancy of the species on which we focused. We observed three shark, two ray, and two sea turtle species, finding higher abundances of all species in our low human population sites compared to high human population sites. Our results highlight the ability of consumer-grade drones to estimate the abundance and distribution of large-bodied elasmobranchs and sea turtles in shallow water habitats. Further, our study supports their capability to evaluate issues related to the conservation and management of nearshore ecosystems.}, number={5}, journal={LATIN AMERICAN JOURNAL OF AQUATIC RESEARCH}, author={Hensel, Enie and Wenclawski, Stephanie and Layman, Craig A.}, year={2018}, month={Nov}, pages={1025–1033} }