tailieunhanh - REPRODUCTIVE CHARACTER DISPLACEMENT AND SPECIATION IN PERIODICAL CICADAS, WITH DESCRIPTION OF A NEW SPECIES, 13-YEAR

This development of egg cells occurs within the ovary once a month. One mature egg cell is released from one of the ovaries. The ovaries con- tain follicles. A follicle is a hollow bundle of cells with an egg inside. The follicle helps the egg mature. As the egg matures, the follicle enlarges and fills with fluid. The greatly enlarged follicle moves to the edge of the ovary and bursts, releasing the egg and the fluid. This event is ovulation, the release of an egg from the ovary. (See Figure 17-4.) The egg cell gets swept into the oviduct (or fallopian tube), a long tubular structure found next. | Evolution 54 4 2000 pp. 1313-1325 REPRODUCTIVE CHARACTER DISPLACEMENT AND SPECIATION IN PERIODICAL CICADAS WITH DESCRIPTION OF A NEW SPECIES 13-YEAR MAGICICADA NEOTREDECIM David C. Marshall1 2 and John R. Cooley2 3 Department of Biology and Museum of Zoology University of Michigan 1109 Geddes Avenue Ann Arbor Michigan 48109-1079 1 Email dmarshal@ Abstract. Acoustic mate-attracting signals of related sympatric synchronic species are always distinguishable but those of related allopatric species sometimes are not thus suggesting that such signals may evolve to reinforce premating species isolation when similar species become sympatric. This hypothesis predicts divergences restricted to regions of sympatry in partially overlapping species but such reproductive character displacement has rarely been confirmed. We report such a case in the acoustic signals of a previously unrecognized 13-year periodical cicada species Magicicada neotredecim described here as a new species see Appendix . Where M. neotredecim overlaps M. tredecim in the central United States the dominant male call pitch frequency of M. neotredecim increases from approximately kHz to kHz whereas that ofM. tredecim remains comparatively stable. The average preferences of female M. neotredecim for call pitch show a similar geographic pattern changing with the call pitch of conspecific males. Magicicada neotredecim differs from 13-year M. tredecim in abdomen coloration mitochondrial DNA and call pitch but is not consistently distinguishable from 17-year M. septendecim thus like other Magicicada species M. neotredecim appears most closely related to a geographically adjacent counterpart with the alternative life cycle. Speciation in Magicicada may be facilitated by life-cycle changes that create temporal isolation and reinforcement could play a role by fostering divergence in premating signals prior to speciation. We present two theories ofMagicicada speciation by life-cycle evolution .

• Sức khỏe phụ nữ
• current investment
• climate in Denmark
• German market
• German economy
• Legal environment
• Purchase contract
• Summary of Ph D thesis
• Thesis Summary of Doctor of Law
• Investment protection
• Investment of ASEAN
• Investment protection of Vietnam
• Real corporate world practices
• Regarding financing current assets decision
• Working capital management
• Investment in current assets
• Financing Current Assets
• Summary of Doctoral thesis
• Summary of Doctoral thesis Finance – Banking
• Public investment
• Current period in Vietnam
• Managing Vietnam’s public investment
• Khoa học xã hội
• Tạp chí khoa học
• Foreign Direct Investment
• Taiwanese Investment
• Taiwanese Investment in Vietnam
• Managerial accounting
• Current and prospective investors
• Media content
• Field study in KSA
• Rationalizing credit
• International trade
• International investment
• Investment environment
• Global trade
• Balance of payments
• Current account
• Environmental protection
• Environment impact assessment
• Investment projects
• Current situation
• International experiences
• Luận văn Thạc sĩ Tài chính ngân hàng
• Finance Banking
• Efficiency of public investment
• Promote disbursement of public investment
• Current Economic and Trade Relations
• Current economic
• Sino Vietnam economic
• Comprehensive strategic cooperative partnership
• Mutual investment
• Medical Therapy
• Current Status
• Future Targets
• Temporal Trends
• Current Perspectives
• Future Trends
• Current account deficit
• Cross border real estate transactions
• House prices
• House prices in Turkey
• Property Calculations
• Investment Returns
• Global economy
• Medical Device Innovation
• Current Trends
• Inventing Medical Devices
• Five Inventors Stories
• Federal Support
• Private Investment
• Health Care
• problem specific
• of different possible buildings
• Alcoholism
• Russian Mortality Crisis
• Current Concepts
• Epidemiology
• Phytaspase Connection
• Membrane H+ ATPase
• MR Pictorial Review
• Pathophysiological Changes
• Early Endometriosis
• Medical Treatment
• current evidence base
• genuine concern
• international consensus
• inefficient resource
• society organizations
• Environment and Development
• Build or Improve
• Improvement and Structure
• Syphilis
• Protozoal Infection
• Human Trichomoniasis