Impacts of detritivore diversity loss on instream decomposition are greatest in the tropics

Boyero, Luz
Lopez-Rojo, Naiara
Tonin, Alan M.
Perez, Javier
Correa-Araneda, Francisco
Pearson, Richard G.
Bosch, Jaime
Albarino, Ricardo J.
Anbalagan, Sankarappan
Barmuta, Leon A.
Basaguren, Ana
Burdon, Francis J.
Caliman, Adriano
Callisto, Marcos
Calor, Adolfo R.
Campbell, Ian C.
Cardinale, Bradley J.
Jesus Casas, J.
Chara-Serna, Ana M.
Chauvet, Eric
Ciapala, Szymon
Colon-Gaud, Checo
Cornejo, Aydee
Davis, Aaron M.
Degebrodt, Monika
Dias, Emerson S.
Diaz, Maria E.
Douglas, Michael M.
Encalada, Andrea C.
Figueroa, Ricardo
Flecker, Alexander S.
Fleituch, Tadeusz
Garcia, Erica A.
Garcia, Gabriela
Garcia, Pavel E.
Gessner, Mark O.
Gomez, Jesus E.
Gomez, Sergio
Goncalves, Jose F., Jr.
Graca, Manuel A. S.
Gwinn, Daniel C.
Hall, Robert O., Jr.
Hamada, Neusa
Hui, Cang
Imazawa, Daichi
Iwata, Tomoya
Kariuki, Samuel K.
Landeira-Dabarca, Andrea
Laymon, Kelsey
Leal, Maria
Marchant, Richard
Martins, Renato T.
Masese, Frank O.
Maul, Megan
McKie, Brendan G.
Medeiros, Adriana O.
Erimba, Charles M. M'
Middleton, Jen A.
Monroy, Silvia
Muotka, Timo
Negishi, Junjiro N.
Ramirez, Alonso
Richardson, John S.
Rincon, Jose
Rubio-Rios, Juan
dos Santos, Gisele M.
Sarremejane, Romain
Sheldon, Fran
Sitati, Augustine
Tenkiano, Nathalie S. D.
Tiegs, Scott D.
Tolod, Janine R.
Venarsky, Michael
Watson, Anne
Yule, Catherine M.
Datos de publicación:
The relationship between detritivore diversity and decomposition can provide information on how biogeochemical cycles are affected by ongoing rates of extinction, but such evidence has come mostly from local studies and microcosm experiments. We conducted a globally distributed experiment (38 streams across 23 countries in 6 continents) using standardised methods to test the hypothesis that detritivore diversity enhances litter decomposition in streams, to establish the role of other characteristics of detritivore assemblages (abundance, biomass and body size), and to determine how patterns vary across realms, biomes and climates. We observed a positive relationship between diversity and decomposition, strongest in tropical areas, and a key role of abundance and biomass at higher latitudes. Our results suggest that litter decomposition might be altered by detritivore extinctions, particularly in tropical areas, where detritivore diversity is already relatively low and some environmental stressors particularly prevalent. It is unclear whether stream detritivore diversity enhances decomposition across climates. Here the authors manipulate litter diversity and examine detritivore assemblages in a globally distributed stream litterbag experiment, finding a positive diversity-decomposition relationship stronger in tropical streams, where detritivore diversity is lower.
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