Konstantinos Tsirintanis – The impact of native and alien herbivores on the invasion of the chlorophyte Caulerpa cylindracea Sonder


11th International Conference on Biological Invasions

The Human Role in Biological Invasions: a case of Dr Jekyll and Mr Hyde?
15.-18. IX. 2020., Vodice, Croatia – Conference Home page

8 replies on “Konstantinos Tsirintanis – The impact of native and alien herbivores on the invasion of the chlorophyte Caulerpa cylindracea Sonder”

Nice poster!. Do you know if there are similar experiments for C. cylindracea in other areas of the Mediterranean Sea? and if so, are those herbivores as efficient in controlling the spread of this algae?. Thank you

Thanks!
I am not aware of a herbivore exclusion experiment in the Med that simultaneously manipulated the presence of Caulerpa cylindracea.
Still there are various feeding experiments that have shown a significant grazing effect of Mediterranean-native grazers to Caulerpa cylindracea (Zuljevic et Al., 2008; Tomas et Al., 2011).

I like that in situ exp. But it looks from the photo like you establish treatments 1 and 2 on rocky bottom free of macroalge contrary to treatment 3. Developments of the C. cyl. might depends on the local community, sedimentation etc. That might compromise your exp.

Hello.
Indeed a differentiation in the initial state of the experimental surfaces could interfere in the experiment. All treatment comparisons were executed between similar state experimental surfaces. Fig1c corresponds to Crete site, while fig1a,b to Lesvos. There were some minor differences at the existing algal community of the rocks between sites but it was not that much. Lesvos had a low turf community on top of the barrens (even in fig.1a,b) while Crete had a more dense but still low turf community on its rocky reef.

We did not encounter those at any visit and we visited cages every two weeks. Juvenile siganids could have interfered in the experimental procedure, as they are abundant in Crete after early August. Their size is capable to let them through cages and possibly graze inside them. This has been observed as well in other caging experiments close by (sala et Al., 2011). No siganids in Lesvos and this could explain the difference after mid summer but it’s just a hypothesis. We are thinking ways to avoid this in the future but you can’t reduce mesh size due to light and water flow artifacts

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