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28. Human Actions Alter Tidal Marsh Seascapes and the Provision of Ecosystem Services

Author

Gilby, Ben L, Weinstein, Michael P, Baker, Ronald, Cebrian, Just, Alford, Scott B, Chelsky, Ariella, Colombano, Denise, Connolly, Rod M, Currin, Carolyn A, Feller, Ilka C, Frank, Alyssa, Goeke, Janelle A, Goodridge Gaines, Lucy A, Hardcastle, Felicity E, Henderson, Christopher J, Martin, Charles W, McDonald, Ashley E, Morrison, Blair H, Olds, Andrew D, Rehage, Jennifer S, Waltham, Nathan J, and Ziegler, Shelby L

Subjects
Climate Action, Life on Land, Life Below Water, Climate change, Ecological functions, Fisheries, Nutrients, Shoreline protection, Urbanization, Earth Sciences, Environmental Sciences, Biological Sciences, Marine Biology & Hydrobiology
Abstract

Tidal marshes are a key component of coastal seascape mosaics that support a suite of socially and economically valuable ecosystem services, including recreational opportunities (e.g., fishing, birdwatching), habitat for fisheries species, improved water quality, and shoreline protection. The capacity for tidal marshes to support these services is, however, threatened by increasingly widespread human impacts that reduce the extent and condition of tidal marshes across multiple spatial scales and that vary substantially through time. Climate change causes species redistribution at continental scales, changes in weather patterns (e.g., rainfall), and a worsening of the effect of coastal squeeze through sea level rise. Simultaneously, the effects of urbanization such as habitat loss, eutrophication, fishing, and the spread of invasive species interact with each other, and with climate change, to fundamentally change the structure and functioning of tidal marshes and their food webs. These changes affect tidal marshes at local scales through changes in plant community composition, complexity, and condition and at regional scales through changes in habitat extent, configuration, and connectivity. However, research into the full effects of these multi-scaled, interactive stressors on ecosystem service provision in tidal marshes is in its infancy and is somewhat geographically restricted. This hinders our capacity to quickly and effectively curb loss and degradation of both tidal marshes and the services they deliver with targeted management actions. We highlight ten priority research questions seeking to quantify the consequences and scales of human impacts on tidal marshes that should be answered to improve management and restoration plans.

Published
2021

31. Climate drives the geography of marine consumption by changing predator communities

Author

Whalen, Matthew A, Whippo, Ross DB, Stachowicz, John J, York, Paul H, Aiello, Erin, Alcoverro, Teresa, Altieri, Andrew H, Benedetti-Cecchi, Lisandro, Bertolini, Camilla, Bresch, Midoli, Bulleri, Fabio, Carnell, Paul E, Cimon, Stéphanie, Connolly, Rod M, Cusson, Mathieu, Diskin, Meredith S, D’Souza, Elrika, Flores, Augusto AV, Fodrie, F Joel, Galloway, Aaron WE, Gaskins, Leo C, Graham, Olivia J, Hanley, Torrance C, Henderson, Christopher J, Hereu, Clara M, Hessing-Lewis, Margot, Hovel, Kevin A, Hughes, Brent B, Hughes, A Randall, Hultgren, Kristin M, Jänes, Holger, Janiak, Dean S, Johnston, Lane N, Jorgensen, Pablo, Kelaher, Brendan P, Kruschel, Claudia, Lanham, Brendan S, Lee, Kun-Seop, Lefcheck, Jonathan S, Lozano-Álvarez, Enrique, Macreadie, Peter I, Monteith, Zachary L, O’Connor, Nessa E, Olds, Andrew D, O’Leary, Jennifer K, Patrick, Christopher J, Pino, Oscar, Poore, Alistair GB, Rasheed, Michael A, Raymond, Wendel W, Reiss, Katrin, Rhoades, O Kennedy, Robinson, Max T, Ross, Paige G, Rossi, Francesca, Schlacher, Thomas A, Seemann, Janina, Silliman, Brian R, Smee, Delbert L, Thiel, Martin, Unsworth, Richard KF, van Tussenbroek, Brigitta I, Vergés, Adriana, Yeager, Mallarie E, Yednock, Bree K, Ziegler, Shelby L, and Duffy, J Emmett

Subjects
Life Below Water, Climate Action, Alismatales, Animals, Biodiversity, Biomass, Climate, Female, Fisheries, Fishes, Food Chain, Geography, Global Warming, Humans, Male, latitudinal gradients, trophic processes, seagrass, biogeography, macroecology
Abstract

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 by generalist predators in shallow marine ecosystems are tightly linked to both temperature and the composition of consumer assemblages. Unexpectedly, rates of consumption peaked at midlatitudes (25 to 35°) in both Northern and Southern Hemispheres across both seagrass and unvegetated sediment habitats. This pattern contrasts with terrestrial systems, where biotic interactions reportedly weaken away from the equator, but it parallels an emerging pattern of a subtropical peak in marine biodiversity. The higher consumption at midlatitudes was closely related to the type of consumers present, which explained rates of consumption better than consumer density, biomass, species diversity, or habitat. Indeed, the apparent effect of temperature on consumption was mostly driven by temperature-associated turnover in consumer community composition. Our findings reinforce the key influence of climate warming on altered species composition and highlight its implications for the functioning of Earth's ecosystems.

Published
2020

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