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![The occurrence and consequences of inbreeding in a reintroduced population of the Mauritius kestrel (Falco punctatus) için kapak resmi The occurrence and consequences of inbreeding in a reintroduced population of the Mauritius kestrel (Falco punctatus) için kapak resmi](/client/assets/d79c3e4af2b6d196/ctx/images/no_image.png)
The occurrence and consequences of inbreeding in a reintroduced population of the Mauritius kestrel (Falco punctatus)
Başlık:
The occurrence and consequences of inbreeding in a reintroduced population of the Mauritius kestrel (Falco punctatus)
Yazar:
Ewing, Steven, author.
ISBN:
9780438059665
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (197 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 76-08C.
Advisors: Ruedi Nager.
Özet:
The study of inbreeding and its deleterious consequences has a long and distinguished academic pedigree in evolutionary biology. Following the pioneering work of Darwin on the effects of selfing and outcrossing in plants, inbreeding depression was embraced as an important component of fundamental evolutionary theories, such as those of mating-system and dispersal evolution. More recently, a principle motivation for the study of inbreeding depression has been its role in conservation biology. Species of conservation interest, by definition, persist in small populations in which there is substantial opportunity for inbreeding, and the expression of inbreeding depression threatens to compromise the viability and persistence of these populations. In this study, I investigate both the occurrence and consequences of inbreeding in one such endangered species, the Mauritius Kestrel (Falco punctatus). The Mauritius Kestrel has been in the conservation limelight for three decades after a catastrophic bottleneck reduced the wild population to only 4 known individuals in 1974. However, following the implementation of a successful conservation programme, the species has rebounded and the contemporary population (2003-04) numbers in excess of 500 individuals. A key component of the management programme was to re-establish the species in areas of suitable habitat from which it had become locally extirpated. This study is based on the long-term, intensive monitoring programme of one of these reintroduced populations, the Bambous Mountain Mauritius Kestrel population. Pedigree analyses of the Bambous Mountain pedigree demonstrated that it is highly inbred (2003 offspring cohort, average F = 0.1733) and that inbreeding has accumulated at a substantial rate (2.6% per generation; Nel = 18.89). This rate of inbreeding markedly exceeds that frequently heralded as an upper acceptable limit in conservation (1% per generation; Nel = 50), and is principally a consequence of the small size of the population. Furthermore, the population has lost genetic variation since its establishment, but at the slightly less rapid rate of 1.6% per generation (Nev = 32.05). Derivation of Wright's F-statistics showed that although the rates of inbreeding are considerable, there was no more inbreeding in the adult fraction of the Bambous Mountain population than would have been expected with random mating (Frr = 0.0068). This occurred, however, not as a result of complete panmixis, but because there was equivalent and opposing magnitudes of genetic differentiation amongst population subdivisions (FST = 0.0861) and excess heterozygosis within population subdivisions (Fis = -0.0867). Despite the substantial rates of inbreeding, and therefore abundant opportunity for inbreeding depression to be expressed in this population, there was little evidence of significant costs associated with inbreeding events. I only found definitive support for inbreeding depression in paternal provisioning rates, and there was also some tentative evidence for a reduction in hatching success with maternal inbreeding. In contrast, no inbreeding depression could be discerned in survival, lifetime breeding success, fledgling success, immunocompetence, fledgling sex ratio, fledgling body mass or lay date. I discuss at length the possible reasons that could account for the this apparent absence of inbreeding depression - in particular, purging of the genetic load, fixation of the genetic load and a lack of statistical power. Given the inconsistent and unpredictable nature of selection in small populations, 1 concluded that purging of the genetic load is unlikely to explain the lack of inbreeding depression in the Mauritius Kestrel. Instead, fixation of the load, and a lack of spatial and temporal replicates, probably largely undermined our attempts to demonstrate inbreeding depression in this species, although a lack of statistical power might also have played a considerable role. The conservation implications of these findings are discussed.
Notlar:
School code: 0547
Mevcut:*
Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(684743.1) | 684743-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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