Species Interaction in Ecosystems

Through the Geog 171 class I have learned a great deal about species interactions. My travels in the Berkeley Hills and Northern California coast ranges demonstrate three species interactions.

The first is an observation of ants decomposing a dead bird carcass nearby my co-op in Berkeley. This is an example of a scavenging from an insect species to a bird species. It is also an example of the lower levels of the food web.

Next is a lichen within the family Lobariaceae growing on the side of an Oak Tree. This is probably a parasitic relationship between the fungus and tree.

Finally we see a wasp gall in the branch of a Coastal Live Oak. This is an example of a parasitic relationship where a wasp injects hormones into a tree branch that makes it swell and produce a "gall" which encases the wasp's larve until they hatch. The tree gains no benefit from the interaction and so it is parasitic.

הועלה ב-פברואר 28, 2013 06:28 לפנה"צ על ידי elliot_goldstein310 elliot_goldstein310

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elliot_goldstein310

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פברואר 10, 2013

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Gall Wasp bulge in willow tree branch. Galls or cecidia are outgrowths on the surface of lifeforms.

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elliot_goldstein310

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פברואר 17, 2013

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Growing on the side of an oaktree this fungus fascinated me. It almost looked like wilted leaves, and was hard to the touch. I looked at neighboring Oak trees and didn't see it growing on them

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נמלים (משפחה Formicidae)

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elliot_goldstein310

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פברואר 27, 2013 01:51 אחה"צ PST

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A swamp of ants begin feeding on a dead bird (species unknown) with yellow belly and brown head.

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