As invasive species, how does the introduction of the feral pig and the water hyacinth impact an ecosystem?

Found in many parts of the world, the feral pig damages crops by trampling and "rooting." It attacks and feeds on livestock (mainly lambs) and causes the spread of weeds. It also spreads diseases such as leptospirosis and foot-and-mouth disease. Feral pigs feed primarily on plants but also on earthworms, insects, amphibians, reptiles, and birds. The water hyacinth spreads at extremely fast rates, in favorable conditions doubling its numbers in as little as 12 days. The plant, which floats on the water's surface, can cover large areas, thus limiting boat traffic, swimming, and fishing. By blanketing the surface, the plant also prevents sunlight from entering the water. Moreover, when it dies, the decaying plant matter robs the water of oxygen. The reduced amount of sunlight and oxygen in the water disrupts plant and animal life, adversely affecting the habitat's biodiversity.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.