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Multi-year changes of a benthic community in the mid-intertidal rocky shore of a eutrophic tropical bay (Guanabara Bay, RJ – Brazil)
Puga, C.A.; Torres, A.S.S.; Paiva, P.C.; Yoneshigue-Valentin, Y.; Junqueira, A.O.R. (2019). Multi-year changes of a benthic community in the mid-intertidal rocky shore of a eutrophic tropical bay (Guanabara Bay, RJ – Brazil). Est., Coast. and Shelf Sci. 226: 106265. https://dx.doi.org/10.1016/j.ecss.2019.106265
In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714; e-ISSN 1096-0015, meer
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| Author keywords |
Rocky shore; Benthic community; Temporal variation; Bioinvasion; Guanabara bay; Monitoring |
| Auteurs | | Top |
- Puga, C.A.
- Torres, A.S.S.
- Paiva, P.C.
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- Yoneshigue-Valentin, Y.
- Junqueira, A.O.R.
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| Abstract |
Intertidal zone of rocky shores is influenced by a wide variety of abiotic and biotic drivers. These variables can affect the species abundance at different temporal scales. In the present study our goal was to evaluate the community changes over the years using different temporal scales (fortnightly, monthly, seasonal and annual) as a tool to understand the effects of biotic (i.e. competition or facilitation) and abiotic drivers (i.e. water temperature, air temperature, tidal regime, rainfall and water quality) in abundance pattern of dominant species (Crassostrea rhizophorae, Saccostrea cuccullata, Tetraclita stalactifera and Amphibalanus amphitrite). The samples were seasonally carried out in the mid-intertidal zone in the Boa Viagem Beach in Guanabara Bay over 7 years (2010 July - 2017 June). From June 2015 to June 2017 fortnightly samplings were made in addition to seasonal sampling. The inter-annual scale was the main scale in which the differences in the percent cover of the benthic community was noted (pseudo-F = 15.96, p = 0.0001). Hierarchical ANOVA indicated that for the dominant species only the annual scale was significant while to the cryptogenic macroalgae Ulva spp. only the seasonal scale. Among the environmental variables selected, dbRDA indicated 6 of them that were significantly relevant to percent cover variation of all species explaining 86,61% of data variation (p < 0.05). While C. rhizophorae e S. cucullata and T. stalactifera exhibited similar response to the relevant environmental variables, A. amphitrite exhibited opposite response to these variables. The species responded to abiotic drivers in different temporal scales. Water temperature was a very important variable, but its effect in the population dynamics of these long-lived species needs long time scales (60 days) to manifest responses at detectable levels as well as the biotic interactions, such as competition, and the effects of bioinvasion. The niche overlap observed among S. cucullata and C. rhizophorae with A. amphitrite was highly significantly (p < 0.001) (i.e.,negative SES). Conversely for the oyster species the observed niche overlap is greater than the niche overlap expected by chance (i.e., SES positive). Environmentally constrained null model approach showed a significant (p = 0.004) relationship only between A. amphitrite and S. cucullata (C-score obs = 1200; C-score exp = 716.6), indicating a negative association. During this long and continuous monitoring, we verified that each environmental variable affects the same species at distinct temporal scales, affecting also some biotic interactions (S. cucullata × A. amphitrite) and consequently the community structure. |
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