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This seastar is an invasive species in Australia. [19] It has colonised Australian waters in the Derwent Estuary, Port Phillip Bay and Henderson Lagoon in Tasmania. [2] [12] In the Derwent Estuary, the Northern Pacific seastar has been connected to the decline of the endemic endangered spotted handfish. [20] [21] [22]
Starfish, such as the ochre sea star (Pisaster ochraceus) and the reef sea star (Stichaster australis), have become widely known as examples of the keystone species concept in ecology. The tropical crown-of-thorns starfish ( Acanthaster planci ) is a voracious predator of coral throughout the Indo-Pacific region, and the Northern Pacific ...
northern Pacific seastar: northern Pacific in northern China, South Korea, North Korea, Japan, Far East Russia, Alaska and Canada (British Columbia) Asterias argonauta Djakonov, 1950: Primorsky Krai (Peter the Great Gulf), South Korea Asterias forbesi (Desor, 1848) northwest Atlantic, from Labrador south to the Caribbean Sea and Gulf of Mexico
The Northern Pacific seastar is considered a serious pest of native marine organisms in Australia, and is a major factor in the decline of the critically endangered spotted handfish. It preys on the handfish eggs, and/or on the sea squirts (ascidians) [1] that help to form the substrate that the fish spawn on. [2]
In a study comparing seastar righting behavior the Henricia leviuscula twisted arms 1 and 3 toward each other, used arms 4 and 5 to support itself on the bottom of the tank, and moved arm 2 up so it was in a sitting-like position, and began to flip itself over. Overall, it had an average righting time of 15.22 minutes.
Solaster dawsoni attacking a spiny red sea star, Hippasteria spinosa An adult specimen of Solaster dawsoni afflicted by the Sea star wasting disease off Vancouver. The morning sun star is a predator, feeding mostly on other starfish. It is feared by other stars which move away as fast as they can if touched by a morning sun star.
Because this sea star is a top-level predator, its disappearance had profound effects on the ecosystem. [20] In the Channel Islands off the coast of California, ten species of sea star were recorded as being affected as well as three species of sea urchins, two brittle stars and a sea cucumber, all of which experienced large population declines ...
The most urgent matter concerning the survival of the species is to address the threat posed by the presence of an introduced species of seastar, the Northern Pacific seastar (Asterias amurensis), which prey on not only the fish eggs, [15] [16] but also on the sea squirts [17] that help to form the substrate that the fish spawn on. [18]