TY - JOUR
T1 - Environmental drivers of temporal succession in recent dinoflagellate cyst assemblages from a coastal site in the North-East Atlantic (Lisbon Bay, Portugal).
AU - Ribeiro, Sofia
AU - Amorim, Ana
N1 - Keywords: Gymnodinium catenatum; Lingulodinium polyedrum; Dinoflagellate cyst signals; Runoff; Upwelling; Water stability
PY - 2008
Y1 - 2008
N2 - Temporal changes in the community structure of recent dinoflagellate cyst assemblages of Lisbon Bay (Iberian upwelling system) were investigated between 2000 and 2005. The assemblages were diverse and characterized by high inter-annual variability, rather than a clear seasonal pattern. In order to identify the main environmental drivers of community changes, several regional (river runoff, rainfall, upwelling, radiation, daylength) and in situ (sea surface temperature, salinity, bottom and surface chlorophyll a concentration) environmental parameters were tested. Multivariate statistical analysis allowed the identification of water stability as the main environmental gradient influencing the community composition, with river runoff in the preceding rain season and upwelling being the two drivers of stratification and turbulence, respectively. Both these processes can be described as nutrient enrichment processes, but the cyst signal indicates that the two mechanisms select for different functional groups. The main upwelling cyst signal is characterised by the dominance of heterotrophic species (Protoperidinioid species) and presence of the autotrophic chain-forming Gymnodinium catenatum, while the river runoff cyst signal is characterised by dominance of autotrophs forming calcareous cysts, mainly Scrippsiella spp. Lingulodinium polyedrum is suggested to be indicative of upwelling conditions in the region but reflecting an ecological niche different from the more classical heterotrophic assemblage and G. catenatum. Our results reinforce the applicability of dinoflagellate cysts as environmental tracers in the warm-temperate region of the NE Atlantic, and contribute to the development of palaeoenvironmental cyst-based signals.
AB - Temporal changes in the community structure of recent dinoflagellate cyst assemblages of Lisbon Bay (Iberian upwelling system) were investigated between 2000 and 2005. The assemblages were diverse and characterized by high inter-annual variability, rather than a clear seasonal pattern. In order to identify the main environmental drivers of community changes, several regional (river runoff, rainfall, upwelling, radiation, daylength) and in situ (sea surface temperature, salinity, bottom and surface chlorophyll a concentration) environmental parameters were tested. Multivariate statistical analysis allowed the identification of water stability as the main environmental gradient influencing the community composition, with river runoff in the preceding rain season and upwelling being the two drivers of stratification and turbulence, respectively. Both these processes can be described as nutrient enrichment processes, but the cyst signal indicates that the two mechanisms select for different functional groups. The main upwelling cyst signal is characterised by the dominance of heterotrophic species (Protoperidinioid species) and presence of the autotrophic chain-forming Gymnodinium catenatum, while the river runoff cyst signal is characterised by dominance of autotrophs forming calcareous cysts, mainly Scrippsiella spp. Lingulodinium polyedrum is suggested to be indicative of upwelling conditions in the region but reflecting an ecological niche different from the more classical heterotrophic assemblage and G. catenatum. Our results reinforce the applicability of dinoflagellate cysts as environmental tracers in the warm-temperate region of the NE Atlantic, and contribute to the development of palaeoenvironmental cyst-based signals.
U2 - 10.1016/j.marmicro.2008.01.013
DO - 10.1016/j.marmicro.2008.01.013
M3 - Journal article
SN - 0377-8398
VL - 68
SP - 156
EP - 178
JO - Marine Micropaleontology
JF - Marine Micropaleontology
IS - 1-2
ER -