An experimental test of colonization ability in the potentially invasive Didemnum perlucidum (Tunicata, Ascidiacea)

  title={An experimental test of colonization ability in the potentially invasive Didemnum perlucidum (Tunicata, Ascidiacea)},
  author={Laura Pioli Kremer and Rosana M. Rocha and James Joseph Roper},
  journal={Biological Invasions},
Exotic species invasions are one of the greatest threats to marine systems and ascidians have many characteristics that favor transport, colonization and establishment into new regions. Didemnum perlucidum is a widespread species that has been introduced into tropical ports around the world. Here we examine the colonizing ability of D. perlucidum by experimental use of artificial plates in a shellfish culture. The experiment comprised paired plates for colonization (bare and occupied) in 16… 

The role of Didemnum perlucidum F. Monniot, 1983 (Tunicata, Ascidiacea) in a marine fouling community.

Results suggest that D. perlucidum may be a weak competitor in a marine fouling community comprised mainly of non-indigenous species, and continuous monitoring is desirable to better understand its fouling dynamics.

Aspects of the growth and reproductive ecology of the introduced ascidian Didemnum perlucidum (Monniot, 1983) in Western Australia.

From a management point of view, the decrease in colony size, larvae production, and recruitment of D. perlucidum during winter could offer the best opportunity for the control or eradication of this ascidian at specific locations in the state.

Occurrence of Didemnum perlucidum Monniot F., 1983 on artificial substrates along the Mediterranean coast of Israel

The ability of D. perlucidum to establish reproductive populations despite the harsh environmental conditions of this region, with temperature fluctuations between 16-31°C and a salinity of 38-39 ppt, raises concern regarding this species’ potential for introductions at numerous sites across the Mediterranean.

Distribution and Localised Effects of the Invasive Ascidian Didemnum perlucidum (Monniot 1983) in an Urban Estuary

The ability of invasive ascidians to colonise and affect native seagrasses and associated biota is demonstrated and is pivotal to the ecological function of many urban estuaries world-wide.

The biotic resistance role of fish predation in fouling communities

Examination of how predation can regulate fouling communities on artificial substrates in the coast of Brazil finds biotic resistance driven by predation was not ubiquitous but apparently targets one group of major economic and environmental impact.

Investigating the cryptogenic status of the sea squirt Didemnum perlucidum (Tunicata, Ascidiacea) in Australia based on a molecular study of its global distribution

This study represents the most comprehensive mapping of the current global distribution of D. perlucidum conducted to date and will hopefully motivate further studies aimed at elucidating this species biology, origin, high-risk routes and impacts.

Growing or reproducing in a temperate sea: optimization of resource allocation in a colonial ascidian

The results add to the mounting evidence that ascidian life cycles in temperate seas are characterized by a trade-off between investment in reproduction and growth, triggered by seasonal temperature shifts and constrained by resource availability during summer.

Population differentiation supports multiple human-mediated introductions of the transatlantic exotic sponge Paraleucilla magna (Porifera, Calcarea)

The results suggest the presence of five genetically distinct populations possibly originated by multiple human-mediated introductions from different sources and show that the putative most recently established population is genetically more diverse.

Mini-review: Impact and dynamics of surface fouling by solitary and compound ascidians

It is suggested that sufficient working knowledge currently exists to support the inclusion of one or more common ascidian species as ‘standard’ test organisms used for evaluation of novel fouling-resistant surfaces.



Variation in the ability of Didemnum sp. to invade established communities

Replacement of the compound ascidian species in a southeastern Brazilian fouling community

The replacement of compound ascidians on two series of ceramic plates has been studied for nine months in the Sao Sebastiao Channel and it seems probable that the replacement of species was related to the death of early colonizers that presented a shorter life span.

Didemnid ascidians : Rapid colonizers of artificial reefs in Eilat (Red Sea)

Both species successfully foul on the artificial reefs prior to the appearance of long lived organisms such as corals, suggesting that the initial recruitment of D. granulatum on the lower sides of the deepest horizontal plates is an outcome of its negatively phototactic and geotropic bottom swimming larvae, which are able to delay settlement in order to locate a suitable settlement site.

Effects of competition on sexual and clonal reproduction of a tunicate: the importance of competitor identity

Findings show that spatial competition reduces both ascidian colony size and gonad production in Didemnum perlucidum, and also affected female gonad pro- duction.

The adaptive value of larval behavior of a colonial ascidian

For Didemnum candidum, light is an important environmental cue used by larvae to locate settlement sites on shaded, downward-facing surfaces where juvenile survival is enhanced.

Association among ascidians: facilitation of recruitment inPyura spinifera

An association between two species of subtidal ascidians where the abundance of one appears to be wholly determined by the abundance the other, and laboratory settlement trials indicated that P. spinifera settle preferentially in response to cues with which recruits are normally associated, while settlement is poor or does not occur in the absence of such cues.

Positive effects of the introduced green alga, Codium fragile ssp. tomentosoides, on recruitment and survival of mussels

Results show that re-colonisation of space by mussels is enhanced by C. fragile, and quick recovery of mussel beds after disturbances could be crucial for controlling the abundance of this alga on breakwaters.

Invasion rates increase with species richness in a marine epibenthic community by two mechanisms

It is shown that for a sessile marine invertebrate community, invasion of patches increases with richness of the patch and resistance to invasion will be determined by the properties of the particular component species and emergent dynamics of the recipient community, and not by an aggregate community property such as richness.