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Darwin proposed the theory of sexual selection to explain the origin of ostentatious plumage in certain bird species, maint
Darwin proposed the theory of sexual selection to explain the origin of ostentatious plumage in certain bird species, maint
admin
2009-05-19
75
问题
Darwin proposed the theory of sexual selection to explain the origin of
ostentatious plumage in certain bird species, maintaining that the ornate
features of males are a consequence of female mate selection based on an
abstract aesthetic sense, not unlike the process of animal breeders producing
(5) fancy-male varieties of pigeons by conscious artificial selection. Wallace
suggested an alternative explanation: through greater physical energy the most
highly adorned males are able to win the competition with rival males.
Meanwhile Huxley pointed out that male adornment is instrumental in
establishing dominance relationships among males: adornment reduces the
(10) physical activity necessary to intimidate rivals.
However, Jacobs later examined the process of female choice, concluding
that what appeared to be choice of an adorned male by a female was really a
mutual attraction to a certain reproductive site. Mate selection requires an
awareness of features characteristic of a suitable breeding site, which might be
(15) mirrored in the ornamentation of the male, and thus mate selection is related
directly to adaptive niche specialization. From this insight, Austin proceeded to
develop a food-courtship theory of mate selection: the population most efficient
in use of the energy available in a particular niche will be the fittest to survive
there. Through natural selection, organisms will tend to become specialized to
(20) form isolated populations, each adapted to utilize the energy most efficiently
that is available in a particular niche and this process of segregation and
specialization of populations is facilitated by employing in the mating process
samples of the food available in the preferred niche. In particular cases, the
male may display the food to the female or feed it to her in the courtship
(25) ceremony, maybe bearing permanent representations of specific foods on his
plumage, and the female may be attracted to the male for these representations
of the territorial foods.
Austin’s theory may be applied to the case for mate choice among
peafowls, whose males’ "eyespotted" tail feathers bear a striking resemblance
(30) to blue berries. According to the food-courtship theory, it is because their
plumage bears representations of food that peacocks attract peahens, which may
explain why males with the most "eyespots" on their tail have the greatest
mating success. Not inconsistent with a possible role of the "eyespots" in
reproductive competition among males and in aesthetic selection, this
(35) explanation seems more plausible than the suggestion that by selecting mates
according to the perfection of their tail-feather "eyespots", peahens are able to
identify mates with the greatest "fitness". This process, bringing together
males and females of similar tastes and physiologies, may lead to speciation.
Some of the male display features may come to be involved in species
(40) identification, and it has also been noted that male adornment could have a dual
function, repelling rival males as well as attracting females.
选项
A、contrasting the role of domination and courtship in determining the evolution of bird plumage
B、illustrating the effectiveness of a particular approach to categorizing various evolutionary innovations
C、documenting the origins of a currently accepted scientific theory about food and courtship
D、proposing a new explanation for the evolutionary reasons behind the ornamentation of male bird plumage
E、showing that physical adaptation plays an integral role in contributing to species identification of birds
答案
D
解析
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