Tag Archives: forest

Old Italian trees: a step toward worldwide recognition?

by Piter Kehoma Boll

Some years ago I wrote an article (you can read it here) about the importance of trees, especially old trees, and how their ecological role is different from that of a young tree.

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Ancient trees are ecological preciosities and need to be preserved for the sake of their ecosystems. Photo by flickr user loshak.*

In Italy, there are specific laws erected to protect ancient trees, especially if they are unique for their species or have some sort of aesthetic or cultural value. Recently, their importance for the preservation of a variety of lifeforms has also started to be recognized. A recently published article by a group of Italian researchers (see below) compared the noteworthy old trees in Italy recorded in a previous list and a new list. They conclude that the new inventory has considerable improvements, although some issues remain, including the presence of exotic, even invasive, species in the list.

But such initiatives are at least important as a first step that may guide us to a better understanding and management of old trees, which are precious elements, but continue to decline worldwide.

Read the study for free:

Zapponi, L.; Mazza, G.; Farina, A.; Fedrigoli, L.; Mazzocchi, F.; Roversi, P. F.; Peverieri, G. S.; Mason, F. (2017) The role of monumental trees for the preservation of saproxylic biodiversity: re-thinking their management in cultural landscapes. Nature Conservation 19: 231–243.

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A tree is more than just a tree

by Piter Kehoma Boll

ResearchBlogging.org Most ordinary people think of a tree as just that, a tree, a big plant with a hard tall stem which provides shade and oxygen and sometimes beautiful flowers or delicious fruits. So, it may not seem such a big issue to cut a tree and plant another to compensate that. After all, in some years that seedling will grow and replace completely the role of its precursor.

However, if you look closer, you’ll find that a tree is so much more than just a tree. You may see that there are other things growing on it, like epiphytic ferns, bromeliads, orchids, mosses, mushrooms, lichens, and mistletoes. And you can also find many animals eating or living on it as well, for example birds, spiders, harvestmen, insects, tree frogs, and even land planarians!

Moss and fungi growing over an orange tree. You can see some (out of focus) oranges in the background.

Moss and fungi growing on an orange tree. You can see some (out of focus) oranges in the background. Photo by Piter Kehoma Boll.*

Many invertebrate and epiphytic plant communities are highly dependent on the age of the trees, as well as on the tree species richness in forests. Saproxylic insects, i.e., those that live on dead wood, such as fungus gnats and beetles, are common in old forests. The same happens to lichens and, as they become established, they offer a range of food and nesting habitats for a lot of invertebrates.

An epiphytic fern over the same orange tree. Photo by Piter Kehoma Boll.

An epiphytic fern over the same orange tree. Photo by Piter Kehoma Boll.*

As many invertebrates associated to old-growth forest are highly specialized, having a strong link with their host tree, they are very susceptible to forest fragmentation. That’s one of the reasons why a seedling cannot replace the ecological role of an old tree.

This feather tells us a bird has passed around here.

This feather tells us a bird has passed around here. Photo by Piter Kehoma Boll.*

Some studies have also shown that the whole community of organisms associated to trees, including epiphytic plants and invertebrates from the canopy and the leaf litter around it, can be influenced by intraspecific genetic variation of trees, i.e., even trees from the same species can have different organisms on and around them depending on their individual set of genes. This has implications for the whole ecosystem, since genetic diversity of trees influence the species diversity of the community.

So the next time you see a tree being cut, remember that it’s not just a tree being cut, but a whole community being put to death. And I hope that it will make you and other people to think a little bit more before doing something that looks far more trivial than it really is.

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References:

Moeed, A., & Meads, M. J. 1983. Invertebrate fauna of four tree species in Orongorongo Valley, New Zealand, as revealed by trunk traps. New Zealand Journal of Ecology, 6, 39-53

Walsh, N. 2012. A preliminary study into the use of canopy invertebrates and sampling techniques in relation to forest indicators in a fragmented Scottish woodland – application and management. The Plymouth Student Scientist, 5 (2), 44-79

Zytynska, S., Fay, M., Penney, D., & Preziosi, R. (2011). Genetic variation in a tropical tree species influences the associated epiphytic plant and invertebrate communities in a complex forest ecosystem. Philosophical Transactions of the Royal Society B: Biological Sciences, 366 (1569), 1329-1336 DOI: 10.1098/rstb.2010.0183

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