Earth & Environmental Sciences
comparative study
92%
wetland
79%
watershed
74%
vegetation
61%
plant species
54%
river
50%
pteridophyte
30%
exotic species
24%
invasive species
21%
natural heritage
13%
woody plant
12%
anthropogenic factor
11%
endangered species
11%
herb
10%
native species
10%
water chemistry
10%
soil type
9%
tributary
9%
environmental factor
8%
drainage
7%
nutrient
6%
lake
5%
sampling
5%
program
5%
Agriculture & Biology
wetlands
100%
comparative study
85%
rivers
80%
vegetation
75%
ferns and fern allies
21%
invasive species
20%
vulnerable species
13%
graminoids
13%
hydrochemistry
13%
herbaceous plants
11%
threatened species
11%
sampling
10%
woody plants
10%
drainage
10%
endangered species
10%
soil types
10%
interspecific variation
9%
indigenous species
8%
lakes
8%
environmental factors
6%
nutrients
6%