![Contemporary Morphological Evolution in a Lacustrine Population of Threespine Stickleback için kapak resmi Contemporary Morphological Evolution in a Lacustrine Population of Threespine Stickleback için kapak resmi](/client/assets/d79c3e4af2b6d196/ctx/images/no_image.png)
Contemporary Morphological Evolution in a Lacustrine Population of Threespine Stickleback
Başlık:
Contemporary Morphological Evolution in a Lacustrine Population of Threespine Stickleback
Yazar:
Watts, Rose, author.
ISBN:
9780438052123
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (49 pages)
Genel Not:
Source: Masters Abstracts International, Volume: 57-06M(E).
Advisors: Susan A. Foster Committee members: John A. Baker; Philip Bergman; Richard King.
Özet:
In the face of rapidly changing environments, some populations go through contemporary evolution in response to altered selective pressures. In this situation, changes in morphology and behavior can be observed to monitor phenotypic transitions. In adaptive radiations such as the threespine stickleback, Gasterosteus aculeatus, species complex, both re-expression of ancestral phenotypes and the expression of novel phenotypes have been detected. I monitored a population of threespine stickleback in Lynne Lake, Alaska, which is undergoing rapid environmental changes due in part to an increase in primary productivity in the lake. Changes have been documented in the body size and foraging behavior of this population in a previous study, causing me to ask whether body morphology had evolved in a direction paralleling these behavioral changes. I predicted a shift from the historically limnetic phenotype to a more benthic body shape and jaw morphology, following the recent expression of benthic foraging behavior and an increase in productivity in the lake. I measured aspects of trophic structure and overall body morphology and interpreted the results by looking at shape components, two indices (jaw opening displacement advantage and suction index), and linear measurements of the jaw structure. I found certain aspects of body form to match the expected trends (including head shape, buccal cavity size and gape width), but many did not (such as overall boy shape, suction index and jaw protrusion). Suites of traits evolve in complex ways, both interacting with each other and following separate patterns. There are often observable differences in evolutionary rates in various traits as well. The morphology of the threespine stickleback population in Lynne Lake may be in the middle of a rapid morphological change, but the future pattern of change and where the phenotype will stabilize along the benthic-limnetic axis is still unclear.
Notlar:
School code: 0048
Tüzel Kişi Ek Girişi:
Mevcut:*
Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(694526.1) | 694526-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
On Order
Liste seç
Bunu varsayılan liste yap.
Öğeler başarıyla eklendi
Öğeler eklenirken hata oldu. Lütfen tekrar deneyiniz.
:
Select An Item
Data usage warning: You will receive one text message for each title you selected.
Standard text messaging rates apply.