participation 6

participation 6 - Chris Stanton October 4 2007 BIONB 221...

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Unformatted text preview: Chris Stanton October 4, 2007 BIONB 221 Section: Th 10:10 Written Participation 6 In the article by Brockmann, horseshoe crabs display two distinctly different mating systems, one involving males that come ashore attached to females and fertilized the eggs that are laid and the other involves satellite males that crowd the nesting areas and fertilize eggs via sperm competition. Males that come ashore in amplexus with females are usually lighter in color, less worn, and have fewer parasitic organisms than the other males, which means they are younger males. The males that act as satellites come ashore to crowd the nesting areas, but are usually weaker and more prone to be overturned, which results in more predation and dessication. By looking at Figure 3 in Brockmann’s piece, the use of two regression lines can explain when the different mating systems are used by the different males. Since the regression lines for attached and unattached males intersect at condition = 3, any males with a condition less...
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