Structural Changes in Macroinvertebrate Communities Associated with Reduction in the Management of Coastal Saltpans

Table 1

Description of type of saltpan, variables, and indices.

variable	symbol	Description
Type of saltpan	Type L-I	Partly managed for salt production (maintenance of low water depths); saltpans:
		Esteiro-Furado^2: EF1, EF2, EF3
		Passa^4: PAS1, PAS2, PAS3
		Praias-Sado^1: PS1, PS2, PS3
	Type L-II	Nonmanaged for salt production (oscillation from high water
		depths to dry land); saltpans:
		Atalaia^2: AT1, AT2, AT3 (^**)
		Gala^3: GAL1, GAL2, GAL3 (*)
		Vaia^1: VAI1, VAI2, VAI3, VAI4 (^**)
		Vasa-Sacos^2: VS1, VS2, VS3 (^**)
		Vau-Nascente^2; VN2, VN3, VN4 (*)
		Vau-Poente^2, VP1, VP2, VP3, VP4, VP5 (*)
Total abundance	𝑁	Total number of individuals of all groups
Relative abundance	𝑃𝑖	Abundance of group 𝑖
Total biomass	𝐵	Dry weight of total individuals
Relative biomass	𝐵𝑖	Mean dry weight of group 𝑖
Percentage of organic matter	𝑂𝑀𝑖	% of dry weight “loss in ignition” of group 𝑖
Species richness	𝑆	Number of species
Margalef index	𝑑	(𝑆−1)/loge(𝑁)
Shannon-Wienner	𝐻^′	−Σ[𝑃𝑖⋅loge(𝑃𝑖)]
Pielou’s evenness	𝐽^′	𝐻^′/loge(𝑆)
Simpson index	1−𝜆^′	1−Σ[𝑁𝑖⋅(𝑁𝑖−1)/(𝑁⋅(𝑁−1))]

Legend: ¹Sado estuary, ²Tejo estuary, ³Mondego estuary, ⁴Ria de Aveiro, (*) P. varians production, (^**) no production = abandoned.