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Survival without water: A key trait of an aquatic invader to spread

Date:
August 22, 2012
Source:
Pensoft Publishers
Summary:
How can aquatic invertebrates spread among different catchments? Spanish researchers have found that an invasive snail from New Zealand (the mudsnail Potamopyrgus antipodarum) can survive up to two days out of water. This allows the species to use birds or fishing tools as vectors to invade new water bodies.

This is the mudsnail Potamopyrgus antipodarum, next to a pencil head for scale.
Credit: Álvaro Alonso, Pilar Castro-Díez, Creative Commons CC-BY 3.0, http://creativecommons.org/licenses/by/3.0/

Nowadays, an increasing number of rivers and lakes are being invaded by exotic snails, which come from remote regions, and even other continents. Such species represent a threat to native species, as they compete for food or space with them.

This is the case of the mudsnail Potamopyrgus antipodarum. This small aquatic snail is native to New Zealand, and has spread throughout rivers, lakes or streams in Europe, Australia, America and Asia. The invasion success of this mudsnail may be partly due to the ability of females to reproduce without participation of males (i.e. parthenogenesis). This means that only one female is able to start a new population. Besides, the reproductive potential is huge, up to 230 juveniles per female in a year.

But how can these snails disperse from catchment to catchment? If the species were able to tolerate desiccation, it could be transported attached to birds, fishing tools or terrestrial animals. This possibility has been investigated by the Spanish ecologists Álvaro Alonso and Pilar Castro-Díez from the University of Alcalá, whose research was published in the open-access journal NeoBiota.

They performed a laboratory experiment, exposing the snails to different dehydration periods and counting the number of surviving snails. In this way they demonstrated that the mudsnail can survive up to 48 hours out of water. From this finding, two (low-cost) and relatively easy control mechanisms for avoiding the spread of mudsnails emerge: 1) exposing to air of any fishing tools and/or boats for more than 53 hours and 2) avoiding the access of wild and domestic animals to infected rivers or lakes via physical barriers or scarecrows. Such simple measures can actually help to preserve water bodies free of invaders.


Story Source:

The above story is based on materials provided by Pensoft Publishers. Note: Materials may be edited for content and length.


Journal Reference:

  1. Alvaro Alonso, Pilar Castro-Díez. Tolerance to air exposure of the New Zealand mudsnail Potamopyrgus antipodarum (Hydrobiidae, Mollusca) as a prerequisite to survival in overland translocations. NeoBiota, 2012; 14 (0): 67 DOI: 10.3897/neobiota.14.3140

Cite This Page:

Pensoft Publishers. "Survival without water: A key trait of an aquatic invader to spread." ScienceDaily. ScienceDaily, 22 August 2012. <www.sciencedaily.com/releases/2012/08/120822112206.htm>.
Pensoft Publishers. (2012, August 22). Survival without water: A key trait of an aquatic invader to spread. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2012/08/120822112206.htm
Pensoft Publishers. "Survival without water: A key trait of an aquatic invader to spread." ScienceDaily. www.sciencedaily.com/releases/2012/08/120822112206.htm (accessed October 22, 2014).

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