Wednesday, January 25, 2012

Bio question continued.?

-Aphids, which suck milk weed sap, are found throughout the year. Crab spiders do NOT feed on the plant itself, but rather on most of the insects that visit the plant. In two to three weeks while milkweed plants are in bloom, successful adult remale crap spiders may increase 10 times in mass before laying their eggs on the innter surface of leaves. Some species of flies, and wasps, which feed on crab spider eggs visit the plants periodically. Harvestman, also known as "daddy long legs", recover the remains left by predators. ~WHAT ARE 2 POSSIBLE HYPOTHESES ABOUT THE EFFECTS OF CRAP SPIDERS ON THE SURVIVAL OF MILKWEED PLANTS?

Bio question continued.?
The two hypotheses would seem to be:

Crab spiders aid the milkweed, by preying more on those insects that harm the plant by eating its leaves, such as milkweed bugs, milkweed beetles, monarch butterflies (are they more helpful than harmful?) and aphids; or

Crab spiders harm the milkweed by preying more on those insects that aid the plant by carrying away pollen, such as butterflies, moths and bees.

Nothing was said about whether the crab spider egg predators and daddy long legs have any helpful or harmful effect on the milkweed, so the fact that the crab spider eggs attract them seems irrelevant to the question.

This answer seems kind of obvious; am I missing something?
Reply:The first one is ....



Crab spiders are actually getting food %26amp; mating grounds from these plants %26amp; as %26amp; when milkweed plants cease to exist the lowest level of food chain will be removed directly or indirectly causing the extinction of the one above it ithe food chain....


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