Abstract:
:Over 1990-1998, the Mondego estuary, Portugal, experienced profound modifications due to eutrophication, culminating in the disappearance and replacement of Zostera noltii by opportunistic macroalgae in the inner most disturbed areas. A decade after restoration measures implementation, Z. noltii started to gradually recolonize the inner parts, following 20 years of absence. This work explores the factors underlying successful Z. noltii recolonization and its subsequent implications on a mud snail Hydrobia ulvae population. During the macroalgal bloom, highest values in H. ulvae abundance, biomass and production were recorded, strongly declining afterwards. Three recovery attempts characterized the post-restoration phase, with considerably increases in H. ulvae abundance, biomass and production since Z. noltii reappearance. The seagrass provided long-term protection and abundant food resources for reproductive adults, contrarily to the ephemeral macroalgae. Through time, large size individuals increased, becoming the population more stable, structured and similar to the one inhabiting the "original"Z. noltii meadows.
journal_name
Mar Environ Resjournal_title
Marine environmental researchauthors
Grilo TF,Cardoso PG,Pardal MAdoi
10.1016/j.marenvres.2011.11.005subject
Has Abstractpub_date
2012-02-01 00:00:00pages
78-84eissn
0141-1136issn
1879-0291pii
S0141-1136(11)00157-7journal_volume
73pub_type
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