TY - JOUR
T1 - Aquatic macrophytes in cool aseasonal and seasonal streams: a comparison between Ecuadorian highland and Danish lowland streams
AU - Jacobsen, Dean
AU - Terneus, Esteban
N1 - Author Keywords: Macrophytes; Species richness; Streams; Páramo; Ecuador
PY - 2001
Y1 - 2001
N2 - The diversity and community structure of aquatic macrophytes in aseasonal streams cool by altitude and seasonal streams cool by latitude was compared using a standardised approach. The aquatic vegetation in 12 small highland streams in the Ecuadorian Andes (3400–4100 m) and in 12 physically and chemically similar lowland streams in Denmark was examined. Our study confirmed that aquatic macrophyte communities in the neotropics are not particularly species rich. Total as well as mean species richness per stream were about the same in the two regions. The species richness within different life-forms (submerged, amphibious, semiaquatic) was, however, different as submerged plants were less diverse in the Ecuadorian streams. Further, all submerged plants found in the Ecuadorian streams belonged to cosmopolitan genera with a mainly north-temperate distribution. We suggest that the low number of submerged species in the Ecuadorian streams (four species) compared to the Danish streams (12 species) may be due to the relatively small land area and age of the high Andes, probably limiting speciation, and a low immigration of species from temperate lowlands and especially from neotropical lowlands.
AB - The diversity and community structure of aquatic macrophytes in aseasonal streams cool by altitude and seasonal streams cool by latitude was compared using a standardised approach. The aquatic vegetation in 12 small highland streams in the Ecuadorian Andes (3400–4100 m) and in 12 physically and chemically similar lowland streams in Denmark was examined. Our study confirmed that aquatic macrophyte communities in the neotropics are not particularly species rich. Total as well as mean species richness per stream were about the same in the two regions. The species richness within different life-forms (submerged, amphibious, semiaquatic) was, however, different as submerged plants were less diverse in the Ecuadorian streams. Further, all submerged plants found in the Ecuadorian streams belonged to cosmopolitan genera with a mainly north-temperate distribution. We suggest that the low number of submerged species in the Ecuadorian streams (four species) compared to the Danish streams (12 species) may be due to the relatively small land area and age of the high Andes, probably limiting speciation, and a low immigration of species from temperate lowlands and especially from neotropical lowlands.
U2 - 10.1016/S0304-3770(01)00189-9
DO - 10.1016/S0304-3770(01)00189-9
M3 - Journal article
SN - 0304-3770
VL - 71
SP - 281
EP - 295
JO - Aquatic Botany
JF - Aquatic Botany
IS - 4
ER -
