Polygyny is the association of one male with multiple females. This mating system is found in a few birds and insects, but is most common in mammals. Polygyny is a strategy used by males to increase their reproductive fitness. Resource Defense Polygyny In resource defense polygyny, groups of...
Besides being incredibly entertaining for spectators, the dance allows the birds to judge each other closely and, scientists believe, choose the mate that bestmirrors their own movements. Like any good performer, flamingos understand the power of makeup. So, during breeding seasonthey slather oilal...
Sanctuary Birds mating season ID: 118988968 收藏 加入清单 下载版权silentwings TIFF大小 16.8MB 格式JPG 编辑图片 以图搜图 大图:2340× 2508 像素·19.81 cm × 21.23 cm·300dpi·JPG 中图:933× 1000 像素·32.91 cm × 35.28 cm·72dpi·JPG 小图:467× 500 像素·16.47 cm × 17.64 cm·72dpi·...
The second aspect explored in this chapter is spatiotemporal patterns of nesting activity. In the Delhi Zoo, considerable variations were recorded in clutch size and nest initiation dates. Early birds, which colonized pond 2 first, exhibited a higher clutch size. The satellite colonies near the ...
1. One of a matched pair: the mate to this glove. 2. A spouse or romantic partner. 3. a. Either of a pair of birds or other animals that associate in order to propagate. b. Either of a pair of animals brought together for breeding. c. Either of a pair of plants, fungi, or...
Social modulation of androgens in male birds Most seasonally reproducing vertebrates show pronounced changes in testosterone levels throughout the year. The Challenge Hypothesis [Wingfield, J.C., Hegn... W Goymann - 《General & Comparative Endocrinology》 被引量: 178发表: 2009年 Androgens and aggre...
The demography of dickcissels in the breeding season suggests, however, that habitat management on a larger scale may be more influential. My findings extend our understanding of sexual selection in birds and the effects of management on the factors required for sexual selection and the mag...
For example, the evolution of mimicry appears to have played an important role in speciation in the butterfly genus Heliconius. The recently split sister species H. melpomene and H. cydno have diverged to mimic the color patterns of different model taxa (Figure 3a), but strong assortative ...
Directional selection and the evolution of breeding date in birds In many bird species, those pairs that breed earlier in the season have higher reproductive success than those that breed later. Since breeding date is kno... TM Price,M Kirkpatrick,SJ Arnold - 《Science》 被引量: 2213发表: ...
of birds and is 3 ha in size and 150 m offshore65. A 6-m tall tower on the beach wall opposite the island provides views over the island and surroundings. The tower was used for observation for most of the time that birds occupied nests on the island, which lasts from the end of ...