Thesis

Interaction Between The Parasitic Barnacle Polyascus Plan us (cirripedia: Rhizocephala) And Its Brachyuran Host Metopograpsus Thukuhar: Parasite & Host Ecdysteroid Co-secretion

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Polyascus planus is a parasitic barnacle (rhizocephala) in various crustacean hosts, including Metopograpus thukuhar, that can manipulate the host’s hemolymph ecdysteroid level. Ecdysteroid is an essential hormone for molting and reproductory development in arthropods which includes both rhizocephalan and crustacean. The manipulation allows the parasite to reproduce securely while it stays with the host and cause the host to experience a delayed molting cycle (anecdysis). However, the exact mechanism of parasite’s manipulation is still unknown. Therefore, this experiment incubated organs that have correlation with ecdysteroid production, the host’s Y-Organ (YO) and the parasite’s externa, to produce ecdysteroid in vitro. The produced ecdysteroid was then measured using ELISA to find the ecdysteroid production ability of each organ. The result will then compared with each other to see how each organ contributes to the parasite’s hemolymph ecdysteroid level manipulation. It was discovered that the parasite permanently suppresses the host’s YO ability to produce ecdysteroid while compensating for the low ecdysteroid production of the host by producing ecdysteroid on its own in its externa only when needed. This finding makes P.planus the first rhizocephalan that has been proven to not be fully dependent on its host in terms of endocrinological signaling, giving a novel understanding of how rhizocephalan species interact with their crustacean hosts.

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Series Title

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Call Number

EP BT-016

Publisher

i3L, Jakarta : i3L, Jakarta., 2024

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Language

English

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Classification

EP BT-016

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