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| Harris, Sarah; Kervinen, Matti; Lebigre, Christophe; Pike, Thomas W.; Soulsbury, Carl D.. |
| Male ornaments function as honest cues of male quality in many species and are subject to intra‐ and intersexual selection. These ornaments are generally studied during peak expression, however their size outside the breeding season may determine ultimate ornament size and costliness, and as such reproductive success. We investigated whether male black grouse Lyrurus tetrix eye comb size was related to age, condition and measures of male dominance before and during the breeding season. Total combined eye comb size began to increase ~70 days before the start of the breeding season. Adult males (aged ≥ 2 years old) had consistently larger eye combs than younger males (1 year old) both before and during the breeding season. Heavier and more dominant adult... |
| Tipo: Text |
Palavras-chave: Age; Ornament expression; Dominance. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00440/55121/56577.pdf |
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| Soulsbury, Carl D.; Siitari, Heli; Lebigre, Christophe. |
| Illnesses caused by a variety of micro- and macro- organisms can negatively affect individuals' fitness, leading to the expectation that immunity is under positive selection. However, immune responses are costly and individuals must trade-off their immune response with other fitness components (e.g. survival or reproductive success) meaning that individuals with intermediate response may have the greatest overall fitness. Such a process might be particularly acute in species with strong sexual selection because the condition-dependence of male secondary sexual-traits might lead to striking phenotypic differences amongst males of different immune response levels. We tested whether there is selection on immune response by survival and reproduction in... |
| Tipo: Text |
Palavras-chave: Ecological immunology; ELISA; Immunocompetance; Life history theory; Stabilising selection. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00426/53761/54653.pdf |
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| Soulsbury, Carl D.; Lebigre, Christophe. |
| There is widespread interest in the relationship between individual genetic diversity and fitness-related traits (heterozygosity-fitness correlations; HFCs). Most studies have found weak continuous increases of fitness with increasing heterozygosity, while negative HFCs have rarely been reported. Negative HFCs are expected in cases of outbreeding depression, but outbreeding is rare in natural populations. Negative HFCs may also arise through viability selection acting on low heterozygosity individuals at an early stage producing a skew in the heterozygosity distribution. We tested this idea using survival and clutch parameters (egg mass, egg volume, chick mass, clutch size) in female Black Grouse Lyrurus tetrix and carried out simulations to determine how... |
| Tipo: Text |
Palavras-chave: Inbreeding; Outbreeding; Neutral loci; Selective mortality; Genetic diversity. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00423/53448/54340.pdf |
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