AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Molgula manhattensis [WoRMS] | |
Authority | (De Kay, 1843) | |
Family | Molgulidae | |
Order | Stolidobranchia | |
Class | Ascidiacea | |
Phylum | Chordata | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Ocean: Atlantic --> Ocean region: NW Atlantic References: Hewitt, C. L., Campbell, M. L., Thresher, R. E., Martin, R. B., Boyd, S., Cohen, B. F., ... & Lockett, M. M. (2004). Introduced and cryptogenic species in port Phillip bay, Victoria, Australia. Marine biology, 144(1), 183-202. |
Life form / Life stage (?) |
|
Sociability / Life stage (?) |
References (not structured): Haydar, D., Hoarau, G., Olsen, J. L., Stam, W. T., Wolff, W. J. 2011. Introduced or glacial relict? Phylogeography of the cryptogenic tunicate Molgula manhattensis (Ascidiacea, Pleurogona). Diversity and Distributions, 17(1), pp. 68-80. Comments: M. manhattensis is a solitary tunicate with a round, globular body shape. |
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Self-fertilization Sexual References: Haydar, D., Hoarau, G., Olsen, J. L., Stam, W. T., Wolff, W. J. 2011. Introduced or glacial relict? Phylogeography of the cryptogenic tunicate Molgula manhattensis (Ascidiacea, Pleurogona). Diversity and Distributions, 17(1), pp. 68-80. Comments: Ascidians are simultaneous hermaphrodites; sperm is released in the water column and eggs are fertilized internally. Self-fertilization, which is an advantage in LDD, occurs in several ascidian species including M. manhattensis, for which artificial self-fertilization has been documented in the laboratory. |
Developmental trait (?) | Lecithotrophy Comments: Eggs develop into lecithotrophic larva before metamorphosing into benthic adults. |
Characteristic feeding method / Life stage (?) |
References (not structured): Hiscock, K. 2008. Molgula manhattensis Sea grapes. In Tyler-Walters H. Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 09-08-2024]. Available from: https://www.marlin.ac.uk/species/detail/1735 Comments: They are sessile filter feeders with two siphons, an oral and an atrial siphon. Water is pumped in through the oral siphon, where phytoplankton and detritus is filtered by the gills, and passed on mucus strings to the stomach and intestines. |
Mobility / Life stage (?) |
References (not structured): Haydar, D., Hoarau, G., Olsen, J. L., Stam, W. T., Wolff, W. J. 2011. Introduced or glacial relict? Phylogeography of the cryptogenic tunicate Molgula manhattensis (Ascidiacea, Pleurogona). Diversity and Distributions, 17(1), pp. 68-80. Comments: M. manhattensis occurs on hard substrates, ranging from shells in an otherwise muddy environment, to rocky shores. It commonly occurs on American oysters (Crassostrea virginica), and it can seasonally be the most abundant oyster fouling organism. M. manhattensis has tadpole larvae that can actively swim. |
Salinity tolerance range (?) | Venice system: 6. Polymixohaline [18-30psu] 7. Euhaline [30-40psu] References: Hiscock, K. 2008. Molgula manhattensis Sea grapes. In Tyler-Walters H. Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 09-08-2024]. Available from: https://www.marlin.ac.uk/species/detail/1735 Comments: M. manhattensis occurred in salinities equivalent to 20 to 36 psu. Also it was recorded in brackish (16-30 psu) water of the Belt Sea. |
Habitat modifying ability potential (?) | Autogenic ecosystem engineers |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Unknown Comments: Not available. |
Known human health impact? | Known Comments: Harmless. |
Known economic impact? | Known References: Andrews, Jay D. 1973. Effect of tropical storm Agnes on epifaunal invertebrates in Virginia estuaries, Chesapeake Science 14(4), pp. 223-234. Comments: M. manhattensis is regarded as a serious fouler of oyster cultch (empty shells, placed to encourage spat settlement) and living oysters. |
Known measurable environmental impact? | Known References: Osman, Richard W., Whitlatch, Robert B. 1995. The influence of resident adults on recruitment: a comparison to settlement., Journal of Experimental Marine Biology and Ecology, 190, pp. 169-198. Comments: The rapid growth of M. manhattensis means that it can quickly cover fouled surfaces with multiple layers of tunicates ~10-20 mm deep. This is likely to inhibit settlement of many other organisms. |
Included in the Target Species list? | No References: HELCOM, 2009. Alien Species and Ballast Water [PDF] Available at: https://archive.iwlearn.net/helcom.fi/stc/files/shipping/Table_2_Alienspecies_%20lists_2009.pdf [Accessed 1 July 2024]. |
Association with vessel vectors (?) | Ballast waters Biofouling References: Hewitt, C. L., Campbell, M. L., Thresher, R. E., Martin, R. B., Boyd, S., Cohen, B. F., ... & Lockett, M. M. (2004). Introduced and cryptogenic species in port Phillip bay, Victoria, Australia. Marine biology, 144(1), 183-202. |
Last update by | Sandra Gečaitė, 2024-08-09 |