Zonation of macrobenthos across a mesotidal sandy beach: Variability based on physical factors

Carcedo, M. Cecilia; Fiori, Sandra; Bremec, Claudia

doi:10.1016/j.seares.2016.12.008

Cited by 12 publications

(3 citation statements)

References 51 publications

(76 reference statements)

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“…In some instances, the changes persist over decades, resulting in a regime shift in the beach morphology (Kuriyama and Yanagishima, 2018). Such changes in vegetation and beach morphology in response to local disturbances were also related to shifts in the associated fauna composition (Carcedo et al 2017;Delgado-Fernandez et al 2019). Direct attribution of these observed events to climate change is not available despite early evidence (since the 1970s) and an emerging literature (Section 4.3.3.1, Table SM5.7).…”

Section: Sandy Beachesmentioning

confidence: 99%

Changing Ocean, Marine Ecosystems, and Dependent Communities

2022

The Ocean and Cryosphere in a Changing Climate

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Section: Sandy Beachesmentioning

confidence: 99%

Changing Ocean, Marine Ecosystems, and Dependent Communities

2022

The Ocean and Cryosphere in a Changing Climate

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“…The pea crab inhabits the upper portion of the host's burrows (Manning and Felder 1989) and lives near the entrance of these structures. Both crabs and shrimps are distributed along the entire intertidal zone with some seasonal variations in zonation patterns (Carcedo et al 2017).…”

Section: Study Areamentioning

confidence: 99%

Dominant Bivalve in an Exposed Sandy Beach Regulates Community Structure Through Spatial Competition

Carcedo

Fiori

Scotti

et al. 2019

Estuaries and Coasts

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Fluctuations in abundance of dominant species can cause competitive release of resources with consequences on community structure and functioning. In the present study, changes in the intertidal macroinfauna community of an exposed sandy beach were evaluated during two contrasting periods characterized by low and high densities of the yellow clam Amarilladesma mactroides. The increase in clam abundance and biomass was associated with a significant decrease in abundance of the rest of the community. In particular, a decline was observed for the pea crab Austinixa patagoniensis, a commensal species that lives in the burrows of the shrimp Sergio mirim. Our study demonstrates that fluctuations in clam abundance lead to long-term changes in community structure, suggesting the presence of competitive interactions. The environmental stability over the two periods strengthens the hypothesis that the competition between species is crucial for shaping the ecological community. Stable isotope analysis allows discarding trophic competition as mechanism of exclusion. Image maps reveal complementary distribution of species, showing the relevance of the spatial competition, which is mediated by changes in abundance of a third species. Indeed, high densities of A. mactroides reduce the available area for the establishment of the S. mirim burrows, limiting the foraging behavior of its commensal, the pea crab. Such an interaction drives density-dependent exclusion of the pea crab from the intertidal zone following the establishment of the yellow clam population. This study illustrates that spatial competition triggered by the increase of a bed-forming species can have community-wide consequences in exposed sandy beaches.

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“…It facilitates the migration of individuals from the subtidal to the intertidal level, thereby altering species distribution (i.e. zonation) between periods of low and high tides (McLachlan, De Ruyck & Hacking, 1996;Carcedo, Fiori & Bremec, 2017). Furthermore, tidal movement alters both the availability of food and protection from desiccation (Phillips, 1977;Palmer, 1984;Skov et al, 2005;Chew et al, 2015;De Grande et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Full stomachs at empty tides: tidal cycle affects feeding activity and diet of the sandy beach gastropod Olivella minuta

Checon

Silva

Corte

et al. 2020

Journal of Molluscan Studies

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Olivella minuta is an abundant neogastropod on sandy beaches from Texas (USA) to southern Brazil. This study aimed to characterize and compare the feeding activity and diet of a Brazilian population of O. minuta in different tidal zones (intertidal and subtidal), and different tidal levels (high and low tides), with three combinations of tidal zone and level being studied (intertidal during low tide, intertidal during high tide and subtidal). The results showed that diet composition was generally similar among tidal conditions, with O. minuta being a generalist, feeding on 45 different food items. Feeding activity, however, was higher in the intertidal during low tide, whereas the richness and diversity of food items were higher in the intertidal during high tide. The higher feeding activity of O. minuta during low tide may be linked to a lower risk of predation; at low tide organisms may be able to feed for a longer time, and this may be particularly true on beaches with fine sand, where water retention is higher than that on beaches with coarse sand. The higher diversity of food items consumed in the intertidal during high tide is likely related to the increased prevalence of planktonic food during high tide. Our results indicate that tidal zone and level may strongly influence the feeding activity of coastal soft-bottom species and that species may show higher feeding activity during low tide. Given the current loss of intertidal habitats due to anthropogenic activity and climate-change associated factors, our study has important implications, highlighting the importance of intertidal areas for the ecology and conservation of sandy beach species.

show abstract

Zonation of macrobenthos across a mesotidal sandy beach: Variability based on physical factors

Cited by 12 publications

References 51 publications

Changing Ocean, Marine Ecosystems, and Dependent Communities

Changing Ocean, Marine Ecosystems, and Dependent Communities

Dominant Bivalve in an Exposed Sandy Beach Regulates Community Structure Through Spatial Competition

Full stomachs at empty tides: tidal cycle affects feeding activity and diet of the sandy beach gastropod Olivella minuta

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