The sharksucker ( Echeneis naucrates) attached to a tucuxi dolphin ( Sotalia guianensis) in estuarine waters in south-eastern Brazil

2008 ◽  
Vol 1 ◽  
Author(s):  
Marcos César de Oliveira Santos ◽  
Ivan Sazima
Keyword(s):  
Estuarine Waters ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
Eastern Brazil

scholarly journals Feeding habits of Guiana dolphins, Sotalia guianensis, from south-eastern Brazil: new items and a knowledge review

2012 ◽  
Vol 92 (8) ◽  
pp. 1723-1733 ◽  
Author(s):  
Xênia Moreira Lopes ◽  
Ednilson da Silva ◽  
Manuela Bassoi ◽  
Roberta Aguiar dos Santos ◽  
Marcos César de Oliveira Santos
Keyword(s):  
Fish Species ◽  
Coastal Waters ◽  
Feeding Habits ◽  
Regression Equations ◽  
Estuarine Waters ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
Cephalopod Species ◽  
Eastern Brazil ◽  
Important Fish

This study presents new information on feeding habits of Guiana dolphins, Sotalia guianensis, in south-eastern Brazil, together with new regression equations to evaluate the weight and length of fish from otoliths, showing an overview on the knowledge about this species’ diet in this area. Eighteen stomach contents had been analysed and compared to 180 samples collected in another eight feeding studies. The analysed specimens were either incidentally caught in gillnets used in coastal waters by the fleet based in the Cananéia main harbour (25°00′S 47°55′W), south of São Paulo State, or found dead in inner waters of the Cananéia estuary between 2003 and 2009. Based on the index of relative importance analysis, the most important fish species were the banded croaker, Paralonchurus brasiliensis. Doryteuthis plei was the most representative cephalopod species. Stellifer rastrifer was the most important fish species observed in dolphins in inner estuarine waters and P. brasiliensis in recovered dolphins from coastal waters. Loliguncula brevis is the only cephalopod species reported from dolphins found in inner estuarine waters up to date. Doryteuthis plei was the most important cephalopod species observed in coastal dolphins. When considering other feeding studies, the most representative fish family in the diet of S. guianensis was Sciaenidae, which is mainly represented by demersal fishes. The main preys of S. guianensis are abundant in the studied areas, which may indicate an opportunistic feeding habit. The majority of them are not the most important target species by the commercial fishery in south-eastern Brazil.

Stomach contents of the marine tucuxi dolphin (Sotalia guianensis) from Rio de Janeiro, south-eastern Brazil

2007 ◽  
Vol 87 (1) ◽  
pp. 253-254 ◽  
Author(s):  
Ana Paula Madeira Di Beneditto ◽  
Salvatore Siciliano
Keyword(s):  
Rio De Janeiro ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Additional Information ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
Eastern Brazil ◽  
Trichiurus Lepturus ◽  
Cynoscion Guatucupa ◽  
Janeiro State

Along the central coast of Rio de Janeiro State (22°25′S–23°00′S), south-eastern Brazil, the marine tucuxi dolphin (Sotalia guianensis) feeds on neritic prey that are distributed through the water column and are abundant all year round. The most frequently found species were the teleost fish Trichiurus lepturus, Cynoscion guatucupa, Isopisthus parvipinnis and Porichthys porossisimus. Fish species were more important than cephalopod species in the diet of the marine tucuxi. Back calculations of prey sizes indicated that they feed mainly on young specimens. The present study provided additional information on the feeding habits of the marine tucuxi dolphin.

Degrees of residence of Guiana dolphins (Sotalia guianensis) in Ilha Grande Bay, south-eastern Brazil: a preliminary assessment

2010 ◽  
Vol 90 (8) ◽  
pp. 1633-1639 ◽  
Author(s):  
Mariana de A. Espécie ◽  
Rodrigo H.O. Tardin ◽  
Sheila M. Simão
Keyword(s):  
Resource Availability ◽  
Southern Brazil ◽  
Preliminary Assessment ◽  
Photo Identification ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
Eastern Brazil ◽  
Low Degree ◽  
Identification Technique ◽  
Over Time

The Guiana dolphin, Sotalia guianensis, is a small delphinid found in coastal areas from northern Honduras to southern Brazil. Little is known about the ecology of this species in several areas of its geographical distribution. In this paper, we present new data about the residency of Guiana dolphins in Ilha Grande Bay, south-eastern Brazil. Boat surveys were conducted at the study area from May 2007 to March 2008. Applying the photo-identification technique, we took pictures of dolphins' dorsal fins, looking for natural markings on them. A total of 17,969 photographs were taken, from which was created a databank of 462 distinct dolphins. Individuals showed different degrees of residency in the bay. More than 50% of the catalogued dolphins were considered non-residents and/or showed a low degree of residence. The average interval between resightings was 35 ± 27.4 days. Animals without markings (calves and juveniles) accounted for 45% (N = 2917) of photographs taken. These results indicate that this population has a fluid structure including different individuals over time. We suggest a possible relationship between the presence of some individuals and local resource availability, such as prey and protected areas.

Individual identification and habitat use of the estuarine dolphin Sotalia guianensis (Cetacea: Delphinidae) in Cananéia, south-eastern Brazil, using video images

2008 ◽  
Vol 88 (6) ◽  
pp. 1199-1205 ◽  
Author(s):  
L.V. de Oliveira ◽  
E.L.A. Monteiro-Filho
Keyword(s):  
Habitat Use ◽  
Individual Identification ◽  
Dorsal Region ◽  
Extensive Area ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
Dorsal Fin ◽  
Video Images ◽  
Eastern Brazil ◽  
Estuarine Dolphin

Individual identification using Hi8 video images was tested on the population of estuarine dolphins, Sotalia guianensis that inhabit the Cananéia estuary, south-eastern Brazil. Between June 2001 and August 2002, 25 different dolphins were identified by nicks on the dorsal fin (80%) and by the association of cuts and scratches on the dorsal fin and the body's dorsal region (20%). The existent marks were used to create an identification key to ease the matching between dolphins. The animals were present on 100% of the sampled days, and some of them were repeatedly registered at the same sector in the area, suggesting that although they occupy an extensive area, they use it in an intended way. When compared to researches that used photographs to identify cetaceans, the video images showed some loss of information, nevertheless the analysis could be done without impairment of results, therefore this method proved to be efficient.

The economic evaluation of estuarine dolphin (Sotalia guianensis) watching tourism in the Cananéia region, south-eastern Brazil

2012 ◽  
Vol 6 (1) ◽  
pp. 95 ◽  
Author(s):  
Gislaine de Fatima Filla ◽  
Claudia Inês Botelho de Oliveira ◽  
Joao Manuel Gonçalves ◽  
Emygdio Leite de Araujo Monteiro Filho
Keyword(s):  
Economic Evaluation ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
Eastern Brazil ◽  
Estuarine Dolphin

Habitat use by marine tucuxis (Sotalia guianensis) (Cetacea: Delphinidae) in Guanabara Bay, south-eastern Brazil

2007 ◽  
Vol 87 (1) ◽  
pp. 201-205 ◽  
Author(s):  
Alexandre F. Azevedo ◽  
Alvaro M. Oliveira ◽  
Simone C. Viana ◽  
Monique Van Sluys
Keyword(s):  
Habitat Use ◽  
Habitat Degradation ◽  
Guanabara Bay ◽  
Sotalia Guianensis ◽  
South Eastern ◽  
The North ◽  
Eastern Brazil ◽  
North Eastern ◽  
Kolmogorov Smirnov ◽  
South Axis

Data on habitat use by marine tucuxis (Sotalia guianensis) were collected in Guanabara Bay (GB), south-eastern Brazil, over a two-year period. Diurnal activities of marine tucuxis were dominated by behaviour related to feeding/foraging (58% of all recorded time). Dolphins spent more time in feeding/foraging activities in the morning with a secondary peak in late afternoon. Dolphins were seen in waters of 2 to 35 m (11.63±6.05; median=12.0). Depths used by S. guianensis groups significantly differed from depths available in GB (Kolmogorov–Smirnov test; Z=5.72; P<0.001). Most groups (69.8%) were sighted in depths between 5.1 and 15.0 m. Dolphins occupied an area of 136.9 km2, which represents about 42% of the entire water surface of GB. Individuals selected areas within GB and avoided the most degraded ones, which suggests that habitat degradation may affect S. guianensis distribution. Diurnal distances travelled by individuals ranged from 3.3 to 27.2 km in a same day. Dolphins found in main channel and adjacent waters moved along the north–south axis of GB throughout the day and covered distances three times greater than dolphins which concentrated their activities in north-eastern areas.

scholarly journals A new species ofEugenia(Myrtaceae) from south-eastern Brazil

2008 ◽  
Vol 158 (2) ◽  
pp. 306-308
Author(s):  
MARCELO DA COSTA SOUZA ◽  
MARLI PIRES MORIM
Keyword(s):  
New Species ◽  
South Eastern ◽  
Eastern Brazil ◽  
A New Species
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