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Two species of bivalve-eating starfish

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Reference no: EM131940685

For their field project on the effects of competition a pair of ecology students studied two species of bivalve-eating starfish, the Newman Star, Stricklandia soileauae (Hale, 1991) and O'Pry's Star, Inderkummenia mcdadei Meyer and Hoffman, 2012. They collected data on mean starfish mouth size from a number of sites.

Site                                                                        Mean mouth size

The Aguinaga Hills

Stricklandia soileauae                                                       4.0 cm

Inderkummenia mcdadei                                                      2.6 cm

Wacko Warren's Tours

Stricklandia soileauae                                                      4.1 cm

Inderkummenia mcdadei                                                      2.5 cm

The Blay Locks

Stricklandia soileauae                                                                          3.9 cm                                        

      Inderkummenia mcdadei                                                       2.5 cm      

Urban Renewal Zone

        Inderkummenia mcdadei                                                      3.2 cm

Boyett City

        Stricklandia soileauae                                                         3.2 cm

Sarah's Booth

        Stricklandia soileauae                                                         4.2 cm

        Inderkummenia mcdadei                                                      2.4 cm

Messy Nick's Emporium

        Stricklandia soileauae                                                         4.2 cm

        Inderkummenia mcdadei                                                    2.4 cm

Young's Madhouse

        Stricklandia soileauae                                                                          3.2 cm

The Clay Pits

        Stricklandia soileauae                                                         3.9 cm

        Inderkummenia mcdadei                                                      2.2 cm

Breauville

Stricklandia soileauae                                                                         3.2 cm

Kacietown

        Stricklandia soileauae                                                                          3.1 cm

New Sydney

        Stricklandia soileauae                                                                          3.1 cm

Victory Land

        Inderkummenia mcdadei                                                                        3.0 cm

Crystal River

        Inderkummenia mcdadei                                                                        3.1 cm

Cooley Creek

        Inderkummenia mcdadei                                                                        4.0 cm

        Stricklandia soileauae                                                                          2.3 cm

The Davis Coast

        Inderkummenia mcdadei                                                                    3.2 cm

Tailor Shop

        Stricklandia soileauae                                                                          3.9 cm

        Inderkummenia mcdadei                                                                       2.1 cm

Eakin's Bacon

        Inderkummenia mcdadei                                                                        3.3 cm

Port Landry

        Stricklandia soileauae                                                                          3.3 cm

Johnson City

        Stricklandia soileauae                                                                          4.1 cm

        Inderkummenia mcdadei                                                                        2.5 cm

Nick's Pass

        Stricklandia soileauae                                                                          3.2 cm

Kellar's Cellar

        Inderkummenia mcdadei                                                                        3.3 cm  

The students claimed that their data suggest that the two species might be competitors. Why? Their professor agreed with them, but pointed out that they had not yet proven that these two species are competitors. Why? What should they do to prove the two species are competitors?

Reference no: EM131940685

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