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Pigment-based skin colour in the blue-footed booby: an honest signal of current condition used by females to adjust reproductive investment
In monogamous species, the value of present reproduction is affected by the current condition of the mate, and females may use male ornaments to evaluate his condition and adjust their level ofExpand
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A three-isotope approach to disentangling the diet of a generalist consumer: the yellow-legged gull in northwest Spain
The widespread omnivory of consumers and the trophic complexity of marine ecosystems make it difficult to infer the feeding ecology of species. The use of stable isotopic analysis plays a crucialExpand
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Senescent birds redouble reproductive effort when ill: confirmation of the terminal investment hypothesis
This study reports an experimental confirmation of the terminal investment hypothesis, a longstanding theoretical idea that animals should increase their reproductive effort as they age and theirExpand
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Avoiding bad genes: oxidatively damaged DNA in germ line and mate choice.
August Weismann proposed that genetic changes in somatic cells cannot pass to germ cells and hence to next generations. Nevertheless, evidence is accumulating that some environmental effects canExpand
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Experimental manipulation of maternal effort produces differential effects in sons and daughters: implications for adaptive sex ratios in the blue-footed booby
Sex allocation theory predicts that mothers in good condition should bias their brood sex ratio in response to the differential benefits obtained from increased maternal expenditure in sons andExpand
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Are Eisenia fetida ( Savigny , 1826 ) and Eisenia andrei Bouché ( 1972 ) ( Oligochaeta , Lumbricidae ) different biological species ?
ee front matter & 200 pedobi.2004.08.005 ing author. ess: jdguez@uvigo.es Summary Two closely related earthworm species, Eisenia fetida (Savigny, 1826) and Eisenia andrei Bouché (I.N.R.A. Publ. Ann.Expand
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HOW GENERAL IS THE CENTRAL-PERIPHERY DISTRIBUTION AMONG SEABIRD COLONIES? NEST SPATIAL PATTERN IN THE EUROPEAN SHAG
Abstract The central-periphery distribution model of nest dispersion suggests that nests located in the center of a colony are less accessible to predators and that birds breeding in the central areaExpand
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Male reproductive senescence: the price of immune-induced oxidative damage on sexual attractiveness in the blue-footed booby.
In animals, male reproduction is commonly a function of sexual attractiveness, based on the expression of sexually dimorphic traits that advertise genuinely the male's quality. Male performance mayExpand
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Differential body condition regulation by males and females in response to experimental manipulations of brood size and parental effort in the blue‐footed booby
Summary 1. In long-lived species, such as seabirds, the allocation of resources between selfmaintenance and reproduction is of particular interest because only a small reduction in adult survival mayExpand
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Are Eisenia fetida (Savigny, 1826) and Eisenia andrei (Oligochaeta, Lumbricidae) different biological species?
Summary Two closely related earthworm species, Eisenia fetida (Savigny, 1826) and Eisenia andrei Bouche (I.N.R.A. Publ. Ann. Zool. Ecol. Anim. (no. hors-serie) 72(2) (1972) 671pp.) were analysed forExpand
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