Data/hora: 16/06/2024 11:23:27

Provedor de dados: | 27
País: | Belgium
Título: | Life history adaptation to demographic regime in laboratory-cultured &lt;i&gt;Tisbe furcata&lt;/i&gt; (Copepoda, Harpacticoida)
Autores: | Bergmans, M.
Data: | 1984
Ano: | 1984
Palavras-chave: | Laboratory culture Life history Tisbe furcata (Baird; 1837).
Resumo: | A laboratory population of &lt;i&gt;Tisbe furcata&lt;/i&gt; (Copepoda, Harpacticoida) with a 35-generation history of stable population size was examined for life history adaptations to demographic stationarity. Survival and fecundity schedules and individual fitness parameters were measured; a standard being provided by three accessions of the wild source population. &lt;i&gt;Tisbe furcata&lt;/i&gt; responded to density regulation by increasing its potential net reproductive rate, R&lt;sub&gt;o&lt;/sub&gt; This result is in agreement with the theory of fitness in age-structured populations, though in contradiction with intuitions based on the &lt;i&gt;r-K&lt;/i&gt;paradigm. The physiological mechanisms through which R&lt;sub&gt;o&lt;/sub&gt; is raised are high age-specific fecundity, delayed senescence and, primarily, increased frequency of egg sac production. The reasons for the adoption of the latter mechanism rather than other alternatives are analyzed. The cost of early reproduction is held responsible for differences between cohorts in the distribution of individual minimum generation times: (indirect) truncation-type selection in the case of R&lt;sub&gt;o&lt;/sub&gt;-selection is opposed to a (direct) symmetric pattern in the case of &lt;i&gt;r&lt;/i&gt;-selection. This is one of the first papers reporting adaptive fine-tuning of the &lt;i&gt;l&lt;sub&gt;x&lt;/sub&gt;m&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt; schedule in an equilibrium rather than &lt;i&gt;r&lt;/i&gt;-selected population.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3313
Fonte: | %3Ci%3EEvolution+38%282%29%3C%2Fi%3E%3A+292-299
Fonte: | info:eu-repo/semantics/restrictedAccess