The dietary results suggest that the two predators show partial dietary overlap over several major dimensions of the foraging niche: prey profile, foraging habitats, prey species and size range. However, global indices such as the Mantel test or the Pianka's index indicate no or weak overlap. Pacific White-Sided Dolphins, endemic to the North Pacific, are one of the most abundant cetaceans along the central and northern California coastline, often. Here are the top five main differences between the orca and the dolphin: Appearance: Orcas are black and white with a large dorsal fin, whilst dolphins are grey and sleek, with a longer beaked mouth. The Main Differences Between an Orca and a Dolphin. Several prey species are common in the two diets and even the length distributions of some of them, such as sardine or scads, are very similar. Orca (left) vs Bottlenose dolphin (right) Visual Comparison. The diet of the bottlenose dolphin was characterised by the presence of large specimens of demersal fish (91 percent by mass) and cephalopods. While dolphins have a round, bulbous melon, porpoises do not. They have small, rounded heads and blunt jaws instead of beaks. Dolphins have a lean sleek body, whereas porpoises often appear more stout or chubby. Porpoises tend to be smaller seldom exceeding 7 feet in length, whereas many dolphin species can exceed 10 feet in length. The diet of the harbour porpoise was mostly composed of small schooling fish living close to the seafloor (98 percent by mass). It combines information about distinguishing features and video clips of six marine mammal species including harbor porpoise, common dolphins, bottlenose. In comparison to dolphins, porpoises are very small. In this work, we describe the diets of each predator in the Bay of Biscay and adjacent areas from stomach content analysis of stranded animals. This hypothesis implies that the two predators should share all or part of they prey range. Violent attacks on harbour porpoises by bottlenose dolphins were reported and it was proposed that this behavior could result from competitive interactions for food. In aquatic ecosystems, competitive interactions are occasionally described.

Porpoise vs dolphin