Read e-book online Alternative reproductive tactics PDF

By Oliveira R.F., Taborsky M., Brockmann H.J. (eds.)

ISBN-10: 0521832438

ISBN-13: 9780521832434

The research of other reproductive strategies (the behavioural techniques utilized by members to extend their reproductive good fortune) is an evolutionary puzzle, and certainly one of nice curiosity to researchers. for example, why perform a little men defend either nest and eggs, whereas others sneak into nests whereas pairs are spawning and fertilise these eggs? the sector bargains a unique chance to check the evolution and practical reasons of phenotypic edition, that's a common challenge within the box of evolutionary biology. via integrating either mechanistic (psychological) and evolutionary (behavioural ecology) views and through masking an exceptional range of species, replacement Reproductive strategies addresses this built-in subject of longstanding curiosity, bringing jointly a large number of in a different way scattered details in an obtainable shape that's perfect for graduate scholars and researchers.

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Taken together these four processes are required for the maintenance of distinct alternative phenotypes in a population. 2). This occurs when individuals must choose (during development or as adults) between mutually exclusive alternatives and when those decisions present individuals with functional trade-offs (Halama and Reznick 2001). 3). It must move extremely quickly and so it has evolved an asymmetric mouth: left-jawed fish attack from the right rear and right-jawed from the left rear. Host fish learn to avoid attacks so if all parasites were right-jawed, then a rare left-jawed morph would have an advantage.

Host fish learn to avoid attacks so if all parasites were right-jawed, then a rare left-jawed morph would have an advantage. The success of a morph depends on its frequency in the population, and the two morphs are maintained at a frequency such that they are equally successful (frequencydependent selection). In other cases (conditional tactics), animals use decision rules or switch points to change tactics so that they will derive the highest possible fitness based on their circumstances (sometimes referred to as “best of a bad job”: Lee 2005).

TABORSKY delayed development is likely controlled by maternal cues (Tauber et al. 1986, McWatters and Saunders 1997). Partial bivoltinism has been explained as a bet-hedging strategy against an early winter freeze (diapausing individuals are protected from freezing whereas pupating or adult individuals are not: Taylor 1980, 1986) or other catastrophe for one or the other tactic. However, frequency dependence may be involved because if all individuals choose to overwinter, then selection will favor those that emerge later in the same summer and take advantage of the abundant available resources (Seger and Brockmann 1987).

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Alternative reproductive tactics by Oliveira R.F., Taborsky M., Brockmann H.J. (eds.)


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