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Papers by Fernando Félix
Report of the International Whaling Commission, 1994
Se presentan estimaciones de la captura incidental de cetáceos en redes pesqueras artesanales en ... more Se presentan estimaciones de la captura incidental de cetáceos en redes pesqueras artesanales en Ecuador. En el caso de los cetáceos pequeños, la estimación de la mortalidad se basó en un estudio realizado en 1993 en dos importantes puertos artesanales, Puerto López y Santa Rosa. Basado en los índices de captura de ese estudio se estima que la mortalidad anual a nivel nacional sería de alrededor de 17,000 animales, entre delfines y ballenas de dientes. Esta estimación se considera tentativa debido a la falta de información sobre el esfuerzo pesquero artesanal en otros puertos. También se presenta información sobre la tasa de enredamiento de ballenas jorobadas (Megaptera novaeangliae), la cual se estimó en 32 (95% IC 28-37) ballenas por año, basada en información obtenida entre 2004 y 2006. Entre las principales causas de la elevada cantidad de cetáceos que mueren por interacción con redes artesanales pelágicas están: una flota artesanal sobredimensionada, falta de medidas de manejo pesquero y el poco interés mostrado por las autoridades pesqueras en el tema de la captura incidental.
Diseases of Aquatic Organisms, 2009
We document two unusual cases of a Bryde's and a sei whale struck by container cargo vessels ... more We document two unusual cases of a Bryde's and a sei whale struck by container cargo vessels and draped over the bow bulb, respectively in the Southeast Pacific and the Eastern Tropical Atlantic. The 207m-length P&O Nedlloyd Pantanal collided with an adult Bryde's whale Balaenoptera edeni in the southern Gulf of Guayaquil, Ecuador, on 10 December 2004. The whale showed
61th IWC Scientific Committee Meeting, 2009
The distribution and seasonal occurrence of humpback whales (Magaptera novaeangliae) cows with ca... more The distribution and seasonal occurrence of humpback whales (Magaptera novaeangliae) cows with calves were analyzed during the breeding season (June-October) around the Santa Elena Peninsula, Ecuador (2 10'S, 81 00'W). In 571 trips carried out ...
Aquatic Mammals
A study on the coastal bottlenose dolphin was carried out between February 1990 and October 1992 ... more A study on the coastal bottlenose dolphin was carried out between February 1990 and October 1992 in the inner estuary of the Gulf of Guayaquil, Ecuador (3 S, 80 W). In 143 boat surveys, a total of 4021-4351 dolphins in 241 groups were recorded. 441 different dolphins were identified by natural marks of which 1557 resightings were obtained. Based on resightings, it was established that this population of dolphins is organized in communities of around 115 animals (S.D.=37). Three resident and two non-resident communities were recorded in the study area. Resident communities occurred along 20-40 km of coast in overlapping home ranges. There were interactions between groups of different communities in 13.3% of the observations. Association patterns among individuals of different age and sex classes were analyzed. Females mainly associated with other females and formed bands. Every band showed preferences to use different sites of the community home range. Subadults associated to a particular adult female band. In contrast, adult males did not show preference to associate with any band. Several males occurred in highstable pairs and competed for females in what seems to be a hierarchically structured society, with one pair of dominant males controlling the access to females in the community. These findings suggest a marked polygynous mating behavior in this tropical population that contrasts to what was observed in other temperate and subtropical populations.
A new case of a whale Bryde's (Balaenoptera edeni) struck by a ship in the southwest coast of Ecu... more A new case of a whale Bryde's (Balaenoptera edeni) struck by a ship in the southwest coast of Ecuador is reported. The whale was found floating around the Guayaquil port facility on the night of 15 th April 2009. Photographs taken when the animal was freshly dead show skin lesions and bruising in several parts of the body, particularly on both sides of the head and genital region. It is suspected that the whale got draped on the bow of an unidentified large ship. Environment and port authorities are encouraged to record these events to assess the potential impact of collisions on local species.
Between 1991 and 1997 a photo-identification study of Southeastern Pacific humpback whales was ca... more Between 1991 and 1997 a photo-identification study of Southeastern Pacific humpback whales was carried out on the central coast of Ecuador (1°26'S, 80°50'W), South America. During this period, a total of 219 whales were identified and catalogued by the colouration pattern on the ventral side of their flukes. Naturally marked whales were used to estimate the population through the Petersen's mark-recapture method as modified by Bailey. With data from the final two seasons (1996)(1997), the resultant estimate was 1,922 (95% CI = 77-3,767) whales. Pooling data from the first six years resulted in an estimate of 2,683 (95% CI = 397-4,969) whales. Sources of bias relate to violations of the assumptions of closure and equal catchability conditions. The low inter-yearly resighting rate and a high rate of new discoveries in the last season indicate that only a fraction of the population has so far been identified. Despite the broad confidence interval, these data provide an indication of the current number of whales.
Report of the International Whaling Commission, 1994
Se presentan estimaciones de la captura incidental de cetáceos en redes pesqueras artesanales en ... more Se presentan estimaciones de la captura incidental de cetáceos en redes pesqueras artesanales en Ecuador. En el caso de los cetáceos pequeños, la estimación de la mortalidad se basó en un estudio realizado en 1993 en dos importantes puertos artesanales, Puerto López y Santa Rosa. Basado en los índices de captura de ese estudio se estima que la mortalidad anual a nivel nacional sería de alrededor de 17,000 animales, entre delfines y ballenas de dientes. Esta estimación se considera tentativa debido a la falta de información sobre el esfuerzo pesquero artesanal en otros puertos. También se presenta información sobre la tasa de enredamiento de ballenas jorobadas (Megaptera novaeangliae), la cual se estimó en 32 (95% IC 28-37) ballenas por año, basada en información obtenida entre 2004 y 2006. Entre las principales causas de la elevada cantidad de cetáceos que mueren por interacción con redes artesanales pelágicas están: una flota artesanal sobredimensionada, falta de medidas de manejo pesquero y el poco interés mostrado por las autoridades pesqueras en el tema de la captura incidental.
Diseases of Aquatic Organisms, 2009
We document two unusual cases of a Bryde's and a sei whale struck by container cargo vessels ... more We document two unusual cases of a Bryde's and a sei whale struck by container cargo vessels and draped over the bow bulb, respectively in the Southeast Pacific and the Eastern Tropical Atlantic. The 207m-length P&O Nedlloyd Pantanal collided with an adult Bryde's whale Balaenoptera edeni in the southern Gulf of Guayaquil, Ecuador, on 10 December 2004. The whale showed
61th IWC Scientific Committee Meeting, 2009
The distribution and seasonal occurrence of humpback whales (Magaptera novaeangliae) cows with ca... more The distribution and seasonal occurrence of humpback whales (Magaptera novaeangliae) cows with calves were analyzed during the breeding season (June-October) around the Santa Elena Peninsula, Ecuador (2 10'S, 81 00'W). In 571 trips carried out ...
Aquatic Mammals
A study on the coastal bottlenose dolphin was carried out between February 1990 and October 1992 ... more A study on the coastal bottlenose dolphin was carried out between February 1990 and October 1992 in the inner estuary of the Gulf of Guayaquil, Ecuador (3 S, 80 W). In 143 boat surveys, a total of 4021-4351 dolphins in 241 groups were recorded. 441 different dolphins were identified by natural marks of which 1557 resightings were obtained. Based on resightings, it was established that this population of dolphins is organized in communities of around 115 animals (S.D.=37). Three resident and two non-resident communities were recorded in the study area. Resident communities occurred along 20-40 km of coast in overlapping home ranges. There were interactions between groups of different communities in 13.3% of the observations. Association patterns among individuals of different age and sex classes were analyzed. Females mainly associated with other females and formed bands. Every band showed preferences to use different sites of the community home range. Subadults associated to a particular adult female band. In contrast, adult males did not show preference to associate with any band. Several males occurred in highstable pairs and competed for females in what seems to be a hierarchically structured society, with one pair of dominant males controlling the access to females in the community. These findings suggest a marked polygynous mating behavior in this tropical population that contrasts to what was observed in other temperate and subtropical populations.
A new case of a whale Bryde's (Balaenoptera edeni) struck by a ship in the southwest coast of Ecu... more A new case of a whale Bryde's (Balaenoptera edeni) struck by a ship in the southwest coast of Ecuador is reported. The whale was found floating around the Guayaquil port facility on the night of 15 th April 2009. Photographs taken when the animal was freshly dead show skin lesions and bruising in several parts of the body, particularly on both sides of the head and genital region. It is suspected that the whale got draped on the bow of an unidentified large ship. Environment and port authorities are encouraged to record these events to assess the potential impact of collisions on local species.
Between 1991 and 1997 a photo-identification study of Southeastern Pacific humpback whales was ca... more Between 1991 and 1997 a photo-identification study of Southeastern Pacific humpback whales was carried out on the central coast of Ecuador (1°26'S, 80°50'W), South America. During this period, a total of 219 whales were identified and catalogued by the colouration pattern on the ventral side of their flukes. Naturally marked whales were used to estimate the population through the Petersen's mark-recapture method as modified by Bailey. With data from the final two seasons (1996)(1997), the resultant estimate was 1,922 (95% CI = 77-3,767) whales. Pooling data from the first six years resulted in an estimate of 2,683 (95% CI = 397-4,969) whales. Sources of bias relate to violations of the assumptions of closure and equal catchability conditions. The low inter-yearly resighting rate and a high rate of new discoveries in the last season indicate that only a fraction of the population has so far been identified. Despite the broad confidence interval, these data provide an indication of the current number of whales.