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Size Scaling of Epibiotic Metabolism on Snail Shells Wright State University CORE Scholar Biological Sciences Faculty Publications Biological Sciences 6-2017 Animals and their Epibiota as Net Autotrophs: Size Scaling of Epibiotic Metabolism on Snail Shells Nicole Lukens Benjamin Kraemer Vanessa Constant Ellen J. Hamann Ellinor Michel See next page for additional authors Follow this and additional works at: https://corescholar.libraries.wright.edu/biology Part of the Biology Commons, and the Systems Biology Commons Repository Citation Lukens, N., Kraemer, B., Constant, V., Hamann, E. J., Michel, E., Socci, A. M., Vadeboncoeur, Y., & McIntyre, P. B. (2017). Animals and their Epibiota as Net Autotrophs: Size Scaling of Epibiotic Metabolism on Snail Shells. Freshwater Science, 36 (2), 307-315. https://corescholar.libraries.wright.edu/biology/566 This Article is brought to you for free and open access by the Biological Sciences at CORE Scholar. It has been accepted for inclusion in Biological Sciences Faculty Publications by an authorized administrator of CORE Scholar. For more information, please contact [email protected]. Authors Nicole Lukens, Benjamin Kraemer, Vanessa Constant, Ellen J. Hamann, Ellinor Michel, Anne M. Socci, Yvonne Vadeboncoeur, and Peter B. McIntyre This article is available at CORE Scholar: https://corescholar.libraries.wright.edu/biology/566 Animals and their epibiota as net autotrophs: size scaling of epibiotic metabolism on snail shells Nicole R. Lukens1,6, Benjamin M. Kraemer1,7, Vanessa Constant2,8, Ellen J. Hamann1,9, Ellinor Michel3,10, Anne M. Socci4,11, Yvonne Vadeboncoeur5,12, and Peter B. McIntyre1,13 1Center for Limnology, University of Wisconsin–Madison, Madison, Wisconsin 53703 USA 2Department of Integrative Biology, Oregon State University, Corvallis, Oregon 97331 USA 3Life Sciences Department, Natural History Museum, London SW7 5BD UK 4Foundation for Sustainable Forests, Spartansburg, Pennsylvania 16434 USA 5Department of Biological Sciences, Wright State University, Dayton, Ohio 45435 USA Abstract: Animals are heterotrophic by definition, but species from many taxonomic groups are hosts to epibiota that may alter their net metabolism. We tested the degree to which snail-shell epibiota can generate net ecosystem productivity for snails and their epibiota (snail–epibiota ecosystems; SEEs) after accounting for snail respiration. We focused on 3 species from the Lavigeria snail assemblage in Africa’s Lake Tanganyika and quantified the scal- ing of SEE metabolism with shell size under light and dark conditions. The metabolism of snails and their epibiota shifted significantly across the size gradient. SEEs of large snails (>20 mm) were consistently autotrophic during the daytime, reflecting increases in shell algae as snails move into well-lit microhabitats after reaching a size refuge from predation by crabs. We extrapolated daytime individual SEE metabolism patterns to snail assemblages at 11 sites and found that SEEs range from heterotrophic to autotrophic in aggregate, reflecting spatial differences in size distributions. Our integration of organismal traits, species interactions, and assemblage structure reveals the important role of epibiota in organismal metabolism. Large epibiotic contributions to organismal metabolism could be widespread among animals that live in well-lit environments and fertilize their epibiota, but depend on the scaling of epibiotic and host metabolism with body size. Key words: Lavigeria, Lake Tanganyika, primary production, respiration, co-evolution, microhabitat, assemblage, community Animals are heterotrophic by definition, but species from independent of size (Nagy and Montgomery 1980). In addi- many taxonomic groups host epibiota that may alter their tion, a high ratio of host surface area to mass might enable net metabolism. For example, some caddisflies (Mooney epibiota to contribute substantially to metabolism, even et al. 2014), sloths (Suutari et al. 2010), and turtles (Neil achieving net autotrophy if sufficient area were available 1954) have substantial epibiotic communities that include to epibiotic primary producers to offset respiration by their both primary producers (e.g., epiphytic algae) and hetero- host. Hairy or spinous animals might be especially attrac- trophs (e.g., heterotrophic bacteria). The biomass of epi- tive hosts because their surface texture increases the sur- biota rarely exceeds that of the host, but small organisms face area available to epibiota. Moreover, host excreta may (e.g., algae) have much higher mass-specific metabolic rates fertilize epibiota on various time scales, as in cases of urine than larger organisms (Makarieva et al. 2008). Thus, pri- washing by primates (Milton 2010) or local enrichment of mary production of epibiota could partially offset or even the water by aquatic organisms (Mooney et al. 2014). Envi- exceed the respiration of their animal host (Allen 1971, ronmental context also might mediate the metabolic bal- Pollard and Kogure 1993), potentially creating autotrophy ancebetweenahostanimalanditsepibiota.Primaryproduc- of the host–epibiota ecosystem. tion per unit area generally increases with solar irradiance. The relative role of epibiota in the net metabolism of Therefore, hosts that dwell in well-lit environments are host–epibiota ecosystems depends on the host’s traits and likely to support substantial epibiotic primary producers. its environment. For instance, sedentary animals generally The relative contribution of epibiotic metabolism to net have lower basal metabolic rates than more active animals, host–epibiota metabolism may be highest when the host is E-mail addresses: [email protected]; 7To whom correspondence should be addressed, [email protected]; [email protected] .edu; [email protected]; [email protected]; [email protected]; [email protected]; [email protected] DOI: 10.1086/691438. Received 19 April 2016; Accepted 2 January 2017; Published online 24 February 2017. Freshwater Science. 2017. 36(2):307–315. © 2017 by The Society for Freshwater Science. 307 This content downloaded from 130.108.169.094 on December 01, 2017 10:42:57 AM All use subject to University of Chicago Press Terms and Conditions (http://www.journals.uchicago.edu/t-and-c). 308 | Epibiotic contributions to organismal metabolism N. R. Lukens et al. sedentary, textured, and fertilizes the environment avail- with snail size. Last, we applied our size-based model of SEE able to epibiota. metabolism to snail density and size distribution data from We evaluated the metabolic balance between snails and 11 nearshore sites to assess spatial variability in potential their epibiota in Lake Tanganyika, the oldest and deepest SEE metabolism in aggregate across snail assemblages. lake in Africa. Lake Tanganyika is exceptionally clear and Merging survey data and metabolic measurements allowed nutrient poor. Its nearshore zone is highly productive with us to use snail traits to estimate their collective role in lit- species-rich animal communities including a radiation of toral ecosystem metabolism. freshwater snails (West and Michel 2000), many of which are hosts for epibiota including algae, bryozoans, sponges, rotifers, and insects. Several abundant Lavigeria species METHODS achieve relatively large shell sizes by the standards of fresh- Study system water snails (>20-mm length), offering opportunities to Lake Tanganyika is the 2nd-oldest and most voluminous quantify metabolic scaling with size. The benthic algae in lake in the world. The lake never fully mixes and has a per- the nearshore zone of Lake Tanganyika have exceptionally manently anoxic zone below 100- to 200-m depth. The lake high productivity per unit biomass (O’Reilly 2006), in part ecosystem is under threat from a number of sources includ- because abundant and diverse grazers prevent periphyton ing climate change (O’Reilly et al. 2003, Tierney et al. 2010, accumulation (McIntyre et al. 2006). Our observations also Kraemer et al. 2015) and anthropogenic sedimentation, suggest that snail shells frequently have more algal biomass which reduces habitat availability for snails living on rocky per area than littoral rocks at the same depth. Thus, Lake substrates (Cohen et al. 1993, McIntyre et al. 2005). Tanganyika’s snails are an ideal model system for compar- Tanganyika is among the most species-rich lakes in the ing epibiotic primary production to snail respiration to as- world, and most animal taxa in the lake are endemic (Va- sess the degree to which snail–epibiota ecosystems (SEEs) deboncoeur et al. 2011) and part of species flocks (i.e., in can be autotrophic. situ evolutionary radiations of closely related species; Salz- We measured the respiration and primary production burger et al. 2014). The high endemicity of its fauna reflects of SEEs across a broad range of snail shell lengths (L) for the lake’s size, age, and diversity of nearshore habitats. Lake 3 species of Lavigeria snails in the nearshore zone of Lake Tanganyika has at least 81 species of gastropods (West et al. Tanganyika. We expected that SEE respiration (R) would 2003), nearly all of which are endemic. The actual number scale with L2.54 based on the scaling of R with snail soft tis- of gastropod species in the lake may be double that de- sue mass (M) (R ∝ M0.75; Gillooly et al. 2001) and the scaling scribed. Over 40 additional Lavigeria and 20 Paramelania of snail tissue mass with length (M ∝ L3.38). Furthermore, species have been recognized from recent collections (Bur- assuming that SEE gross primary
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