what efforts are being made to conserve the original bird?
It is a species of least concern, as the population is large and appears to be growing.
Australasian gannet
The International Union for the Conservation of Nature (IUCN) lists the Australasian gannet as a species of least concern, as the population is large and appears to be growing. 
what is a australasian gannet? A large seabird. where is it found? Steep Point in Western Australia, along the southern and eastern Australian coastline to the vicinity of Rockhampton in Queensland, as well as the North and South Islands of New Zealand, Lord Howe and Norfolk Islands. what does it eat? Forage fish and cephalopods. apart from this bird what are the other predators of the first one? Other fishes like tuna, striped bass, cod, salmon, barracuda and swordfish, as well as sharks, whales, dolphins, porpoises, seals, sea lions, and seabirds. where are they found? They are found along coastlines and also in lakes and rivers. does the original bird have a unique call? A  harsh "arrah-arrah" or "urrah-urrah". who are its predators? Southern giant petrel , kelp gull, and Pacific gull. how does the first one mate? It sexual maturity at six or seven years of age and the breeding season begins in October. what does it eat? Fish, krill, squid, offal , and waste from vessels. what is the sub-species of the second bird you mentioned? "L. d. dominicanus" and  "L. d. vetula" . can you please describe the third bird that you mentioned? A very large white gull with dark wings and back, and a very thick red-tipped yellow bill.
wiki:6510554
Australasian gannet [SEP] Conservation status
The International Union for the Conservation of Nature (IUCN) lists the Australasian gannet as a species of least concern, as the population is large and appears to be growing. There are possible impacts from commercial fishing, though this is probably low compared with other seabirds. Survival rates each breeding season can vary dramatically, most likely due to food availability and weather. More frequent El Niño–Southern Oscillation events lead to warmer water in Bass Strait, which gives rise to more fish and hence accounting for the increase in Australian waters. Gannets established a mainland colony on Young Nick's Head near Gisborne, after decoys of nesting birds and pre-recorded calls were broadcast to passing gannets in September 2008.