caa a22 4500 445893826 CHVBK 20180317145625.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10750-011-0625-4 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0625-4 The decomposition of aquatic macrophytes: bioassays versus in situ experiments [Elektronische Daten] [D. Silva, M. Cunha-Santino, E. Marques, I. Bianchini Jr.] In aquatic sciences, the agreement between laboratory and field observations remains a challenge. Using kinetic modeling, this research aims to compare the decomposition in laboratory and in situ conditions. In the in situ incubations, the mass decreases of the aquatic macrophytes (Echinodorus tenellus, Hydrocotyle verticillata, Najas microcarpa and Pontederia parviflora) were described using a litter bag technique and in the laboratory their decomposition was maintained under controlled conditions. The plants and water samples were collected from a tropical reservoir (Brazil). To describe the particulate organic carbon (POC) decay we adopted a two stage kinetic model that considered the heterogeneity of resources. The released organic carbon (i.e., losses related to mineralization, dissolution and sedimentation of smaller particles than the litter bag mesh) were used to compare the results derived from the field and laboratory incubations. Despite the methodological differences, the results show equivalence among the POC decay. The decomposition measured by litter bags method was 1.32 faster, owing to the effects of losses by sedimentation of the smaller particles, abrasion, action of decomposer organisms (e.g., fragmentation and enzymatic attack) and synergy among these factors. From a mathematical modeling approach, the results validate the use of decomposition data obtained under controlled conditions providing estimations of energy and matter fluxes within aquatic ecosystems. However, it is necessary to adopt a coefficient to acquire the similarity (e.g., 1.32). Springer Science+Business Media B.V., 2011 Decomposition kinetics nationallicence Detritus nationallicence Aquatic plants nationallicence Tropical reservoir nationallicence Mathematical model nationallicence Silva D. Programa de Pós-Graduação em Ecologia de Ecótonos, Universidade Federal de Tocantins (UFT), Av. NS 15, ALCNO 14, Bloco IV, 109 Norte, 77001-090, Palmas, TO, Brazil aut Cunha-Santino M. Departamento Hidrobiologia, Universidade Federal de São Carlos (UFSCar), Rod. Washington Luiz, km 235, São Carlos, SP, Brazil aut Marques E. Programa de Pós-Graduação em Ecologia de Ecótonos, Universidade Federal de Tocantins (UFT), Av. NS 15, ALCNO 14, Bloco IV, 109 Norte, 77001-090, Palmas, TO, Brazil aut Bianchini Jr. I. Departamento Hidrobiologia, Universidade Federal de São Carlos (UFSCar), Rod. Washington Luiz, km 235, São Carlos, SP, Brazil aut Hydrobiologia Springer Netherlands 665/1(2011-05-01), 219-227 0018-8158 665:1<219 2011 665 10750 https://doi.org/10.1007/s10750-011-0625-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0625-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Silva D. Programa de Pós-Graduação em Ecologia de Ecótonos, Universidade Federal de Tocantins (UFT), Av. NS 15, ALCNO 14, Bloco IV, 109 Norte, 77001-090, Palmas, TO, Brazil aut NATIONALLICENCE 700 1- Cunha-Santino M. Departamento Hidrobiologia, Universidade Federal de São Carlos (UFSCar), Rod. Washington Luiz, km 235, São Carlos, SP, Brazil aut NATIONALLICENCE 700 1- Marques E. Programa de Pós-Graduação em Ecologia de Ecótonos, Universidade Federal de Tocantins (UFT), Av. NS 15, ALCNO 14, Bloco IV, 109 Norte, 77001-090, Palmas, TO, Brazil aut NATIONALLICENCE 700 1- Bianchini Jr I. Departamento Hidrobiologia, Universidade Federal de São Carlos (UFSCar), Rod. Washington Luiz, km 235, São Carlos, SP, Brazil aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 665/1(2011-05-01), 219-227 0018-8158 665:1<219 2011 665 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer