Abundance and behavior of the sally lightfoot crab (Grapsus grapsus) in the colony of the brown booby (Sula leucogaster) in the São Pedro and São Paulo Archipelago
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| Format: | Artículo científico |
| Language: | en |
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Pontificia Universidad Católica de Valparaíso
2007
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| author | Dimas Gianuca |
| author_facet | Dimas Gianuca |
| contents | Abundance and behavior of the sally lightfoot crab (Grapsus grapsus) in the colony of the brown booby (Sula leucogaster) in the São Pedro and São Paulo Archipelago Dimas Gianuca Carolus Maria Vooren Ciencias de la Tierra Brazil Grapsus grapsus Sula leucogaster São Pedro and São Paulo Archipelago For nine days, the number of sally lightfoot crabs (Grapsus grapsus) in a 300 m² area within the brown booby(Sula leucogaster) colony and the activity of each crab were recorded in the morning (5:30-7:30 h), at midday (11:30-13:30h), and in the afternoon (15:30-17:30 h). The average number of individuals was 80.2 ± 15.5 (59-111) in the morning, 3.1± 2.3 (0-7) at midday, and 65.3 ± 15 (49-92) in the afternoon. A total of 1338 activity records were made, with the crabsstanding still or walking in 844 records and handling material or feeding in 494 records. In the latter records, 53% of thecrabs were handling detritus (pieces of dry bird excrement and sediment), 12.2% were handling feathers, 12.8% were feedingon regurgitated fish, 8.9% were feeding on dead Sula leucogaster, 8.1% were feeding on crab, 4.7% were feeding onmaterial adhered to egg shells, and 0.6% were feeding on live nestlings of S. leucogaster. The low frequency of crabs inthe colony around noon shows that the crabs avoid insolation, hiding in shady places and tidal pools. In the São Pedro andSão Paulo Archipelago, the presence of S. leucogaster represents an important food source for G. grapsus. This crab playsthe role of a cleaner in the S. leucogaster colony, consuming food remains, broken eggs, and dead birds. 2007 artículo científico 0716-1069 https://www.redalyc.org/articulo.oa?id=45635212 en http://www.redalyc.org/revista.oa?id=456 Investigaciones Marinas application/pdf Pontificia Universidad Católica de Valparaíso Investigaciones Marinas (Chile) Num.2 Vol.35 |
| format | Artículo científico |
| id | redalyc_45635212 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | Pontificia Universidad Católica de Valparaíso |
| spellingShingle | Abundance and behavior of the sally lightfoot crab (Grapsus grapsus) in the colony of the brown booby (Sula leucogaster) in the São Pedro and São Paulo Archipelago Dimas Gianuca Ciencias de la Tierra Brazil Grapsus grapsus Sula leucogaster São Pedro and São Paulo Archipelago Abundance and behavior of the sally lightfoot crab (Grapsus grapsus) in the colony of the brown booby (Sula leucogaster) in the São Pedro and São Paulo Archipelago Dimas Gianuca Carolus Maria Vooren Ciencias de la Tierra Brazil Grapsus grapsus Sula leucogaster São Pedro and São Paulo Archipelago For nine days, the number of sally lightfoot crabs (Grapsus grapsus) in a 300 m² area within the brown booby(Sula leucogaster) colony and the activity of each crab were recorded in the morning (5:30-7:30 h), at midday (11:30-13:30h), and in the afternoon (15:30-17:30 h). The average number of individuals was 80.2 ± 15.5 (59-111) in the morning, 3.1± 2.3 (0-7) at midday, and 65.3 ± 15 (49-92) in the afternoon. A total of 1338 activity records were made, with the crabsstanding still or walking in 844 records and handling material or feeding in 494 records. In the latter records, 53% of thecrabs were handling detritus (pieces of dry bird excrement and sediment), 12.2% were handling feathers, 12.8% were feedingon regurgitated fish, 8.9% were feeding on dead Sula leucogaster, 8.1% were feeding on crab, 4.7% were feeding onmaterial adhered to egg shells, and 0.6% were feeding on live nestlings of S. leucogaster. The low frequency of crabs inthe colony around noon shows that the crabs avoid insolation, hiding in shady places and tidal pools. In the São Pedro andSão Paulo Archipelago, the presence of S. leucogaster represents an important food source for G. grapsus. This crab playsthe role of a cleaner in the S. leucogaster colony, consuming food remains, broken eggs, and dead birds. 2007 artículo científico 0716-1069 https://www.redalyc.org/articulo.oa?id=45635212 en http://www.redalyc.org/revista.oa?id=456 Investigaciones Marinas application/pdf Pontificia Universidad Católica de Valparaíso Investigaciones Marinas (Chile) Num.2 Vol.35 |
| title | Abundance and behavior of the sally lightfoot crab (Grapsus grapsus) in the colony of the brown booby (Sula leucogaster) in the São Pedro and São Paulo Archipelago |
| topic | Ciencias de la Tierra Brazil Grapsus grapsus Sula leucogaster São Pedro and São Paulo Archipelago |
| url | https://www.redalyc.org/articulo.oa?id=45635212 |