Citation:

s41598-017-16346-w

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Abstract:

Many marine invertebrates including ctenophores are capable of extensive body regeneration when injured. However, as for the invasive ctenophore Mnemiopsis leidyi, there is a constant subportion of individuals not undergoing whole body regeneration but forming functionally stable half-animals instead. Yet, the driving factors of this phenomenon have not been addressed so far. This study sheds new light on how differences in food availability affect self-repair choice and regeneration success in cydippid larvae of M. leidyi. As expected, high food availability favored whole-body regeneration. However, under low food conditions half-animals became the preferential self-repair mode. Remarkably, both regenerating and half-animals showed very similar survival chances under respective food quantities. As a consequence of impaired food uptake after injury, degeneration of the digestive system would often occur indicating limited energy storage capacities. Taken together, this indicates that half-animals may represent an alternative energy-saving trajectory which implies self-repair plasticity as an adaptive trade-off between high regeneration costs and low energy storage capacities. We conclude that self-repair plasticity could lead to higher population fitness of ctenophores under adverse conditions such as in ships' ballast water tanks which is postulated to be the major vector source for the species' spreading around the globe.

Comment:

Data on health status of uncut larvae (group 1 and group 3) limited because they were assessed by different inspector.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Species	Species		Javidpour, Jamileh
2	Experiment day	Exp day	day	Javidpour, Jamileh	Day 0=prior cutting; Days 2,4,6,8,10=after cutting
3	Group	Group		Javidpour, Jamileh	Treatment group
4	Identification	ID		Javidpour, Jamileh
5	Treatment	Treat		Javidpour, Jamileh	cutting
6	Treatment: food	T:food		Javidpour, Jamileh	food level
7	Investigator	Investigator		Javidpour, Jamileh
8	Status	Status		Javidpour, Jamileh	current survival status (0=dead, 1=alive, NA=not assessable due to accidental loss)
9	Score	Score		Javidpour, Jamileh	Health score: health status of sample 3=looking healthy and normal, 2=superficial infection (holes)/weak, 1=strong physical defects,desintegrating
10	Size	Size	µm	Javidpour, Jamileh	oral-aboral length
11	Size	Size	µm	Javidpour, Jamileh	size before cutting
12	Size	Size	µm	Javidpour, Jamileh	size 2 days after cutting
13	Food	Food		Javidpour, Jamileh	prey visible in gut or gastrular system (0=not present, 1=present)
14	Score	Score		Javidpour, Jamileh	body score, time-dependent variable, overall body score calculated as sum from tissue scores of statocyst, comb rows, tentacle bulb, tentacle, max. 14.3 if all tissue were regenerated to original size
15	Score	Score		Javidpour, Jamileh	max score, maximum body score observed during experiment
16	Recovery Mode	Recov mode		Javidpour, Jamileh	regeneration event ocurred or not: 0=no regeneration or failed attempt (half animals), 1=regeneration observed, NA=could not be assessed due to early death

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

10152 data points

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