C. Amaral - Academia.edu (original) (raw)
Papers by C. Amaral
Marine Pollution Bulletin, 2013
Understanding how species respond to the environment in terms of population attributes (e.g. abun... more Understanding how species respond to the environment in terms of population attributes (e.g. abundance, growth, mortality, fecundity, and productivity) is essential to protect ecologically and economically important species. Nevertheless, responses of macrobenthic populations to environmental features are overlooked due to the need of consecutive samplings and time-consuming measurements. We examined the population dynamics of the filter-feeding bivalve Anomalocardia brasiliana on a tidal flat over the course of one year to investigate the hypothesis that, as accepted for macrobenthic communities, populations inhabiting environments with low hydrodynamic conditions such as tidal flat should have higher attributes than populations inhabiting more energetic habitats (i.e. areas more influenced by wave energy such as reflective and intermediate beaches). This would be expected because the harsh conditions of more energetic habitats force organisms to divert more energy towards maintena...
The Habitat Harshness Hypothesis (HHH) predicts that populations inhabiting the intertidal area o... more The Habitat Harshness Hypothesis (HHH) predicts that populations inhabiting the intertidal area of a dissipative beach should produce more gametes and have a longer reproductive cycle than those inhabiting an intermediate or reflective beach. This hypothesis was proposed for the exposed morpho-dynamic continuum between the reflective and dissipative states; however, no attempt has been made thus far to verify whether the HHH is valid for tidal flats. In this study, we analysed the reproductive cycle of Anomalocardia brasiliana in an intermediate beach and in a tidal flat and compared the results to determine whether the reproductive cycles of A. brasiliana were in agreement with the predictions of the HHH and to examine the possibility of extending this hypothesis to tidal flats. A continuous spawning season and synchrony between sexes were observed at both sites, although the reproductive effort was higher in the intermediate beach. The results of this first attempt did not support the extension of the HHH to tidal flats. It is possible that hypotheses that take into account only physical variables may not be the most adequate for describing environments with such a high species richness and high abundance as tidal flats. Nevertheless, other studies are necessary to confidently expand or refute the HHH with regard to tidal flats, and this topic should be considered as a priority in future investigations in sandy beach ecology.
![Research paper thumbnail of Rocha et al 2013 suppl material [ The need of more rigorous assessments of marine introductions a counter example from the Brazilian coast ]](https://attachments.academia-assets.com/39136329/thumbnails/1.jpg)
](Supplementary material of "The need of more rigorous assessments of marine species introductions:... more Supplementary material of "The need of more rigorous assessments of marine species introductions: a counter example from the Brazilian coast", by Rosana M. Rocha et al. Farrapeira et al. (2011) re-classified and with taxonomical corrections. When the identification of the species was corrected, the information of the table refers to the correct species name under COMMENTS. ST= status (C= cryptogenic, NI= nonindigenous, N= native, N?= probably native); ORIGIN= native geographical distribution; WORLD= present world geographical distribution (cosm= cosmopolitan, AT= Atlantic, BS= Black Sea, CA= Caribbean Sea; EA= East Atlantic; EP= East Pacific; IN= Indian Ocean, IP= Indo-Pacific, MD= Mediterranean Sea, NS = North Sea, NZ = New Zealand, PC= Pacific, RS= Red Sea, SA= South Africa, unk= unknown, WA= West Atlantic, WP = West Pacific); BRAZIL= geographical distribution in Brazil (ASPSP= Saint Peter and Saint Paul Archipelago, FN= Fernando de Noronha Archipelago, RO= Rocas Atoll, N= North, NE= Northeast, SE= Southeast, S=South, TR= Trindade Island); shVECT= shipping vectors (bw=ballast water, hf=hull fouling, NA = not applicable, pl= mobile platform, sc= sea chest, unk = unknown); oVECT= other vectors (aq= aquaculture, NA = not applicable, rf= rafting, ph=phoresy, unk = unknown); ENV= environment (e= estuarine, m= marine); HAB= habit (bor= boring, borC= boring in calcareous substrate, borW= boring in wood substrate, inf= infauna, mob= mobile, nest= nestling, sed= sedentary, sedB= byssogenous, sedT= tube in sediment, consT= tube on hard substrate, ses= sessile, pk= plankton); COMMENTS= taxonomical corrections and other comments.
Marine Pollution Bulletin, 2013
Understanding how species respond to the environment in terms of population attributes (e.g. abun... more Understanding how species respond to the environment in terms of population attributes (e.g. abundance, growth, mortality, fecundity, and productivity) is essential to protect ecologically and economically important species. Nevertheless, responses of macrobenthic populations to environmental features are overlooked due to the need of consecutive samplings and time-consuming measurements. We examined the population dynamics of the filter-feeding bivalve Anomalocardia brasiliana on a tidal flat over the course of one year to investigate the hypothesis that, as accepted for macrobenthic communities, populations inhabiting environments with low hydrodynamic conditions such as tidal flat should have higher attributes than populations inhabiting more energetic habitats (i.e. areas more influenced by wave energy such as reflective and intermediate beaches). This would be expected because the harsh conditions of more energetic habitats force organisms to divert more energy towards maintena...
The Habitat Harshness Hypothesis (HHH) predicts that populations inhabiting the intertidal area o... more The Habitat Harshness Hypothesis (HHH) predicts that populations inhabiting the intertidal area of a dissipative beach should produce more gametes and have a longer reproductive cycle than those inhabiting an intermediate or reflective beach. This hypothesis was proposed for the exposed morpho-dynamic continuum between the reflective and dissipative states; however, no attempt has been made thus far to verify whether the HHH is valid for tidal flats. In this study, we analysed the reproductive cycle of Anomalocardia brasiliana in an intermediate beach and in a tidal flat and compared the results to determine whether the reproductive cycles of A. brasiliana were in agreement with the predictions of the HHH and to examine the possibility of extending this hypothesis to tidal flats. A continuous spawning season and synchrony between sexes were observed at both sites, although the reproductive effort was higher in the intermediate beach. The results of this first attempt did not support the extension of the HHH to tidal flats. It is possible that hypotheses that take into account only physical variables may not be the most adequate for describing environments with such a high species richness and high abundance as tidal flats. Nevertheless, other studies are necessary to confidently expand or refute the HHH with regard to tidal flats, and this topic should be considered as a priority in future investigations in sandy beach ecology.
Supplementary material of "The need of more rigorous assessments of marine species introductions:... more Supplementary material of "The need of more rigorous assessments of marine species introductions: a counter example from the Brazilian coast", by Rosana M. Rocha et al. Farrapeira et al. (2011) re-classified and with taxonomical corrections. When the identification of the species was corrected, the information of the table refers to the correct species name under COMMENTS. ST= status (C= cryptogenic, NI= nonindigenous, N= native, N?= probably native); ORIGIN= native geographical distribution; WORLD= present world geographical distribution (cosm= cosmopolitan, AT= Atlantic, BS= Black Sea, CA= Caribbean Sea; EA= East Atlantic; EP= East Pacific; IN= Indian Ocean, IP= Indo-Pacific, MD= Mediterranean Sea, NS = North Sea, NZ = New Zealand, PC= Pacific, RS= Red Sea, SA= South Africa, unk= unknown, WA= West Atlantic, WP = West Pacific); BRAZIL= geographical distribution in Brazil (ASPSP= Saint Peter and Saint Paul Archipelago, FN= Fernando de Noronha Archipelago, RO= Rocas Atoll, N= North, NE= Northeast, SE= Southeast, S=South, TR= Trindade Island); shVECT= shipping vectors (bw=ballast water, hf=hull fouling, NA = not applicable, pl= mobile platform, sc= sea chest, unk = unknown); oVECT= other vectors (aq= aquaculture, NA = not applicable, rf= rafting, ph=phoresy, unk = unknown); ENV= environment (e= estuarine, m= marine); HAB= habit (bor= boring, borC= boring in calcareous substrate, borW= boring in wood substrate, inf= infauna, mob= mobile, nest= nestling, sed= sedentary, sedB= byssogenous, sedT= tube in sediment, consT= tube on hard substrate, ses= sessile, pk= plankton); COMMENTS= taxonomical corrections and other comments.