SPERM COMPETITION SELECTS BEYOND RELATIVE TESTES SIZE IN BIRDS

被引:94
|
作者
Luepold, Stefan [1 ]
Linz, George M. [4 ]
Rivers, James W. [2 ]
Westneat, David F. [3 ]
Birkhead, Tim R.
机构
[1] Univ Sheffield, Dept Anim & Plant Sci, Sheffield S10 2TN, S Yorkshire, England
[2] Univ Calif Santa Barbara, Dept Ecol Evolut & Marine Biol, Santa Barbara, CA 93106 USA
[3] Univ Kentucky, Dept Biol, Lexington, KY 40506 USA
[4] USDA APHIS WS Natl Wildlife Res Ctr, Bismarck, ND 58501 USA
基金
瑞士国家科学基金会;
关键词
Icteridae; New World Blackbirds; seminiferous tissue; sperm competition; sperm size; testis architecture; EPIDIDYMAL SPERMATOZOAL RESERVES; BLACKBIRDS AGELAIUS-PHOENICEUS; EXTRA-PAIR FERTILIZATIONS; MATING SYSTEM; BODY-SIZE; HYDROCHOERUS-HYDROCHAERIS; SPERMATOGENIC EFFICIENCY; SEMINIFEROUS EPITHELIUM; PRIMARY DETERMINANT; REPRODUCTIVE-TRACT;
D O I
10.1111/j.1558-5646.2008.00571.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Sperm morphology varies considerably across taxa, and postcopulatory sexual selection is thought to be one of the main forces responsible for this diversity. Several studies have investigated the effects of the variation in sperm design on sperm function, but the consequences of variation in sperm design on testis morphology have been overlooked. Testes size or architecture may determine the size of the sperm they produce, and selection for longer sperm may require concomitant adaptations in the testes. Relative testes size differs greatly between species and is often used as an index of sperm competition, but little is known about whether larger testes have more sperm-producing tissue or produce sperm at a faster rate. Using a comparative approach in New World Blackbirds (Icteridae), we found (1) a strong link between testis histology and sperm length, suggesting selection on testis architecture through selection on sperm size, and (2) that species under intense sperm competition had a greater proportion of sperm-producing tissue within their testes. These results support the prediction that sperm competition fosters adaptations in reproductive organs that extend beyond testes size, and raise questions about the trade-offs influencing reproductive investment.
引用
收藏
页码:391 / 402
页数:12
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