期刊
MARINE ENVIRONMENTAL RESEARCH
卷 173, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2021.105538
关键词
Echinogammarus marinus; Intra-site habitats; Organic matter; Fucus spp
资金
- FCT - Foundation for Science and Technology [UID/Multi/04423/2019]
- European Regional Development Fund (ERDF) [0725_NOR_WA-TER_1_P, 24517 (10/SI/2016-IDT)]
- European Regional Development Fund (ERDF)
- European Social Fund (ESF)
- National funds through FCT-Foundation for Science and Technology [UIDB/04423/2020, UIDP/04423/2020]
Research on amphipod populations in different estuaries in Portugal suggests that anthropogenic pressure can impact biomass and fitness. The study found that the species responds to microhabitat conditions, showing significant differences between estuaries and sites. Although the Ave estuary, with higher expected impacts, had the lowest production, the highest production was actually found in the Mondego estuary.
Inter-population variability may arise as a response to adverse natural and anthropogenic stressors. The dynamics of a key amphipod species (Echinogammarus marinus) was followed during approximate to 1-year at its southerly range (NW Portugal), in three estuaries with different levels of anthropogenic pressure (High - Ave estuary; Moderate - Mondego estuary; Low - Minho estuary). We hypothesised that E. marinus populations would present lower production and fitness, and higher intersexuality incidence with increasing anthropogenic pressure. According to a GAM model explaining approximate to 70% of the observed variability, E. marinus biomass depends on temperature, organic matter, Fucus area and time of the year. Significant differences were found between the gammarid biomass in Minho and Mondego estuaries and within sites from the same estuary. As expected, Ave estuary exhibited the lowest average annual production, abundance and fecundity rates. However, the highest average production was found in Mondego and not in Minho estuary, although the turnover ratio (P/B) of both estuaries was very similar. Besides the system's global ecological status, E. marinus also seems to respond to microhabitat conditions, which may explain the spatial heterogeneity observed in the amphipod production within the same estuary. Intersexuality prevalence was negligible in the three populations, which does not support the idea of a link between anthropogenic pressure and intersexuality in E. marinus. We argue that the dependence of E. marinus on Fucus sp. should be further investigated to fully understand the role of both fucoids and the gammarid in coastal foodwebs.
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