Brachyuran crab community structure and associated sediment reworking activities in pioneer and young mangroves of French Guiana, South America
| Type | Article | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Date | 2016-12 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Aschenbroich Adelaide1, Michaud Emma1, Stieglitz Thomas2, Fromard Francois3, Gardel Antoine4, 5, Tavares Marcos6, Thouzeau Gerard1 | ||||||||||||
| Affiliation(s) | 1 : IUEM, IFREMER, IRD, Lab Sci Environm Marin LEMAR,CNRS,UMR 6539,UBO, Rue Dumont Urville,Technopole Brest Iroise, F-29280 Plouzane, France. 2 : James Cook Univ, Ctr Trop Water & Aquat Ecosyst Res TropWATER, Townsville, Qld 4811, Australia. 3 : Univ Toulouse, EcoLab, CNRS, INPT,UPS, 118 Route Narbonne,Bat 4R1, F-31062 Toulouse 9, France. 4 : USTL, CNRS, UMR 8187, LOG,ULCO, 32 Ave Foch, F-62930 Wimereux, France. 5 : USR, LEEISA, 275 Route Montabo, Cayenne 97334, French Guiana. 6 : Univ Sao Paulo, Museum Zool, Ave Nazareth 481, BR-04263000 Sao Paulo, SP, Brazil. |
||||||||||||
| Source | Estuarine Coastal And Shelf Science (0272-7714) (Academic Press Ltd- Elsevier Science Ltd), 2016-12 , Vol. 182 , N. Part.A , P. 60-71 | ||||||||||||
| DOI | 10.1016/j.ecss.2016.09.003 | ||||||||||||
| WOS© Times Cited | 22 | ||||||||||||
| Keyword(s) | Mangroves, Crabs, Community composition, Bioturbation, French Guiana, Amazon | ||||||||||||
| Abstract | This study in French Guiana evaluates the changes of crab assemblages and their bioturbation activities between mangrove early stages (pioneer and young mangrove) and within stages by taking their spatial heterogeneity (tidal channels, flat areas, pools) into account. The results show differences in crab assemblage structure between and within the early stages of mangrove in relation to microhabitat and sediment characteristics. The sediment reworking rates are a function of the biomass or density of particular species (Ucides cordatus, Uca cumulanta) and burrower functional groups. Crab species or functional interaction mediate changes in sediment reworking rates suggesting the need to consider entire benthic communities rather than single species. This study suggests that the role of the microhabitat in determining the biologically-induced sediment reworking rates depended on the age of the mangrove. Feeding activity results in a sediment turnover of 11.7 ± 9.7 gdw m−2 day−1 and 6.8 ± 3.0 gdw m−2 day−1 in the pioneer and young mangroves, respectively. Burrow maintenance excavates 40.5 ± 7.4 gdw m−2 day−1 and 251.3 ± 419.7 gdw m−2 day−1 in the pioneer and young mangroves, respectively. Upscaling to the studied area (Sinnamary estuary: 6 km2), shows that 500 tons.day−1 and 20 tons.day−1 of sediments could be excavated and pelletized, respectively, during the spring tides of the dry season. Thus, biological sediment reworking would greatly contribute to the sedimentary dynamics of the Guianese mangroves under Amazonian influence. | ||||||||||||
| Full Text |
|