The yellow-legged gull (Larus michahellis) is a widespread species along the Atlantic coasts ofFrance and the Iberian Peninsula, the Azores Islands, Madeira, the countries of the Mediterraneanbasin and the Black Sea. It was formerly considered as a subspecies of Herring Gull (L.argentatus), with which it coexists in some reproductive areas.Only recently L. michahellis has been recognized as a distinct species. Following detailedcomparison of the two species, researchers found that the L. michahellis's restricted but densehead-streaking and advanced primary molt in late summer, are not compatible with L. argentatus.Larus michahellis has a proportionately longer, heavier bill and bulkier head and body than L.urgentutus. In addition, L. michahellis's yellow bill has a red gonydeal spot, both colors typicallybrighter than in L. urgentutus outside breeding season. They also have an orange-red tovermilion orbital ring and yellow legs.DNA research, however, suggests that the yellow-legged gull L. michahellis is actually closest tothe great black-backed gull L. marinus and the Armenian gull L. armenicus comparing with L.urgentutus. Therefore, researchers concluded that these similar-looking yellow-legged gullshould be recognized as a separate species. Based only on the evidence described above,suggest1. species concepts that are consistent with the view that the yellow-legged gull L. michahellisrepresent a separate species; and (note: researchers use multiple lines of evidence tosupport a conclusion.)2. a species concept that does NOT support that view (i.e., that supports the historical one-species classification). For each species concept, explain your reasoning in 1 or 2 sentences.Figures of the two bird species are posted in a sperate file on eClass.

Given The yellow-legged gull (Lars michahellis) is a widespread species along the Atlantic coasts…

suggest 1. species concepts that are consistent with the view that the yellow-legged gull L. michahellis represent a separate species; and (note: researchers use multiple lines of evidence to support a conclusion.) 2. a species concept that does NOT support that view (i.e., that supports the historical one- species classification). For each species concept, explain your reasoning in 1 or 2 sentences. Figures of the two bird species are posted in a sperate file on eClass.

suggest 1. species concepts that are consistent with the view that the yellow-legged gull L. michahellis represent a separate species; and (note: researchers use multiple lines of evidence to support a conclusion.) 2. a species concept that does NOT support that view (i.e., that supports the historical one- species classification). For each species concept, explain your reasoning in 1 or 2 sentences. Figures of the two bird species are posted in a sperate file on eClass.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter22: Speciation

Section: Chapter Questions

Problem 1ITD: David Hills of Baylor University noted that three closely related species of leopard frog (genus...

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David Hills of Baylor University noted that three closely related species of leopard frog (genus Rana) exhibit substantialbut not completepostzygotic reproductive isolation when crossed in the laboratory. Field surveys of numerous populations in Texas and surrounding states revealed that populations of the three species breed at various times during the year. Data on the breeding schedule of both allopatric and sympatric populations of these species are presented in the Figure below. Interpret the data in the figure and explain how they may demonstrate that these frogs experience prezygotic reproductive isolation in nature. What type of prezygotic reproductive isolation do the data suggest? Source: D.M. Hillis. 1981. Premating isolating mechanisms among three species of the Rana pipiens complex in Texas and southern Oklahoma. Copeia 1981:312-319.
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