Beach morphodynamics and clam (Donax hanleyanus) densities in Buenos Aires, Argentina
The studied coastal area is located along the Atlantic Ocean, between the localities of Punta Rasa and Villa Gesell. Twelve monitoring sites were established along the shore. Two morphologie types of beach profiles were observed. One type located northward composed by fine sand, has a linear configu...
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2002
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07490208_v18_n4_p601_Marcomini http://hdl.handle.net/20.500.12110/paper_07490208_v18_n4_p601_Marcomini |
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paper:paper_07490208_v18_n4_p601_Marcomini2023-06-08T15:45:17Z Beach morphodynamics and clam (Donax hanleyanus) densities in Buenos Aires, Argentina Beach morphodynamic Densities Donax hanleyanus Grain size Mobility Population structure beach morphology grain size mobility mollusc population density Argentina Bivalvia Donax hanleyanus The studied coastal area is located along the Atlantic Ocean, between the localities of Punta Rasa and Villa Gesell. Twelve monitoring sites were established along the shore. Two morphologie types of beach profiles were observed. One type located northward composed by fine sand, has a linear configuration profile with low slopes (0.028) and narrow beach (40-70 m width). The other beach type is composed by coarser sand with higher slopes (0.014) and wider beaches (40-80 m), usually presenting a stable berm, and one or two tidal berms. The mean grain size of the beach sediments where the clam Donax hanleyanus occurs varies from fine sand (2.10-2.80 phi) for the north sector (A) to medium to coarse sand (0.70-1.90 phi) in the south sector (B). Donax hanleyanus is found in the lower third of the intertidal zone in the transverse profile. A permanent lack of individuals was observed in the northern part of sector A due to the fresh water influence of the Rio de La Plata estuary. The mean density observed was about 400 individuals per square meter and the highest densities were recorded for Mar del Tuyú with 2250 individuals per square meter. The grain size of the sediments analyzed was not correlated with the occurrence of Donax hanleyanus, although it was observed that the presence of coarser sheets with mean grain size of 0.71 phi and standard deviation of 1.07 affect the burrowing capacity of Donax. The life span of Donax hanleyanus is greater in the south where they can live up to three years. The growth rates are similar for both areas although in the south a decrease in the growth rates was observed during winter. It was observed that the grain size and the morphological changes did not condition the presence of Donax but affected the mobility of Donax hanleyanus along the transverse beach profile. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07490208_v18_n4_p601_Marcomini http://hdl.handle.net/20.500.12110/paper_07490208_v18_n4_p601_Marcomini |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Beach morphodynamic Densities Donax hanleyanus Grain size Mobility Population structure beach morphology grain size mobility mollusc population density Argentina Bivalvia Donax hanleyanus |
| spellingShingle |
Beach morphodynamic Densities Donax hanleyanus Grain size Mobility Population structure beach morphology grain size mobility mollusc population density Argentina Bivalvia Donax hanleyanus Beach morphodynamics and clam (Donax hanleyanus) densities in Buenos Aires, Argentina |
| topic_facet |
Beach morphodynamic Densities Donax hanleyanus Grain size Mobility Population structure beach morphology grain size mobility mollusc population density Argentina Bivalvia Donax hanleyanus |
| description |
The studied coastal area is located along the Atlantic Ocean, between the localities of Punta Rasa and Villa Gesell. Twelve monitoring sites were established along the shore. Two morphologie types of beach profiles were observed. One type located northward composed by fine sand, has a linear configuration profile with low slopes (0.028) and narrow beach (40-70 m width). The other beach type is composed by coarser sand with higher slopes (0.014) and wider beaches (40-80 m), usually presenting a stable berm, and one or two tidal berms. The mean grain size of the beach sediments where the clam Donax hanleyanus occurs varies from fine sand (2.10-2.80 phi) for the north sector (A) to medium to coarse sand (0.70-1.90 phi) in the south sector (B). Donax hanleyanus is found in the lower third of the intertidal zone in the transverse profile. A permanent lack of individuals was observed in the northern part of sector A due to the fresh water influence of the Rio de La Plata estuary. The mean density observed was about 400 individuals per square meter and the highest densities were recorded for Mar del Tuyú with 2250 individuals per square meter. The grain size of the sediments analyzed was not correlated with the occurrence of Donax hanleyanus, although it was observed that the presence of coarser sheets with mean grain size of 0.71 phi and standard deviation of 1.07 affect the burrowing capacity of Donax. The life span of Donax hanleyanus is greater in the south where they can live up to three years. The growth rates are similar for both areas although in the south a decrease in the growth rates was observed during winter. It was observed that the grain size and the morphological changes did not condition the presence of Donax but affected the mobility of Donax hanleyanus along the transverse beach profile. |
| title |
Beach morphodynamics and clam (Donax hanleyanus) densities in Buenos Aires, Argentina |
| title_short |
Beach morphodynamics and clam (Donax hanleyanus) densities in Buenos Aires, Argentina |
| title_full |
Beach morphodynamics and clam (Donax hanleyanus) densities in Buenos Aires, Argentina |
| title_fullStr |
Beach morphodynamics and clam (Donax hanleyanus) densities in Buenos Aires, Argentina |
| title_full_unstemmed |
Beach morphodynamics and clam (Donax hanleyanus) densities in Buenos Aires, Argentina |
| title_sort |
beach morphodynamics and clam (donax hanleyanus) densities in buenos aires, argentina |
| publishDate |
2002 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07490208_v18_n4_p601_Marcomini http://hdl.handle.net/20.500.12110/paper_07490208_v18_n4_p601_Marcomini |
| _version_ |
1768544823938121728 |