Mark-recapture of the endangered franciscana dolphin (Pontoporia blainvillei) killed in gillnet fisheries to estimate past bycatch from time series of stranded carcasses in southern Brazil

Review of thirty-two years of toothed whale strandings in Santa Catarina, southern Brazil (Cetacea: Odontoceti)

“…This increase can be related to an expansion in collection efforts and more consistent collaboration networks, together with a possible increase in fisheries bycatch (e.g., Prado et al 2013). In this study, P. blainvillei had most stranding records in July and September during the austral winter.…”

“…According to Peltier et al (2012), the number of dead cetaceans that reach the coastline and get stranded depend on several parameters such as currents, distance from the coast, atmospheric pressure, wind speed and carcass buoyancy. Coastal species are less influenced by marine currents and coastal winds, commonly stranding near their home ranges (Pyenson 2010, 2011, Prado et al 2013. However, for areas with strong wind and wave dynamics, such as the cold fronts that occur in southern Brazil (rodrigues et al 2004), carcass drift may play a large role in the stranding dynamics.…”

“…studies have suggested that only about 8% of small cetaceans that die at sea end up stranding in coastal areas (Peltier et al 2012, Prado et al 2013). According to Peltier et al (2012), the number of dead cetaceans that reach the coastline and get stranded depend on several parameters such as currents, distance from the coast, atmospheric pressure, wind speed and carcass buoyancy.…”

Environmental Predictors of Seabird Wrecks in a Tropical Coastal Area

“…The binomial errors were the most appropriate for the data, because stranding events were scarce. Nevertheless, the presence of one or few carcasses in a transect indicates a considerable number of deaths at-sea, since there is evidence that only 1–10% of floating corpses at sea are deposited on Brazilian shores and other regions worldwide [54, 62, 70]. Predictor variables were scaled and centered before being used in the modeling.…”

Incidental capture of the short-beaked common dolphin (Delphinus delphis) in the industrial purse seine fishery in northern Chile

“…Marine mammals are no exception; the deaths of tens of thousands of small cetaceans and pinnipeds (seals, sea lions and walrus) have been documented as a result of getting trapped in fishing nets (Hall et al 2000, Bertozzi & Zerbini 2002, Read et al 2006, Prado et al 2013. In Chile, although there is evidence on this kind of interaction in industrial and artisanal fishing for both cetaceans (Goodall et al 1988, Pérez-Alvarez et al 2015 and pinnipeds (Hückstädt & Antezana 2003, Reyes et al 2013, to our knowledge no studies have examined its impacts on local populations of these groups.…”