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Journal Article

Increased or Decreased Separation of Flowering Times? The Joint Effect of Competition for Space and Pollination in Plants

Göran I. Ågren and Torbjörn Fagerström
Oikos
Vol. 35, No. 2 (Oct., 1980), pp. 161-164
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3544424
Stable URL: http://www.jstor.org/stable/3544424
Page Count: 4
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Increased or Decreased Separation of Flowering Times? The Joint Effect of Competition for Space and Pollination in Plants
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Abstract

In earlier reports the effect of an increased temporal segregation of flowering times of co-occurring species has been considered to lead either to increased seed production through decreased competition for pollination and/or pollinators, or to decreased competition between seedlings. However, these two processes are negatively coupled in that increased seed production will lead to increased competition between seedlings. In this article we analyse the consequences of this in a two-species model. We show that there are three possible results of an increase in phenological separation: (1) both species gain fitness; (2) species 1 gains and species 2 loses fitness; and (3) species 1 loses and species 2 gains fitness. We discuss how these results depend upon strength of the coupling between a change in phenological separation and the change in seed production. /// В более ранних сообщениях влияние увеличивающейся временной сегрегации периода цветения видов, встречающихся вместе, рассматривалось как фактор, приводящий к повышению продукции семян при снижении конкуренции за опыление и/или за опылителей, либо к снижению конкуренции между всходами. Однако, эти два процесса отрицательно сочетаются в том отношении, что увеличение продукции семян приводит к увеличению конкуренции между всходами. В данной статье мы анализируем следствия этого на двухвидовой модели. Мы предполагаем три возможных следствия увеличения фенологической сепарации: 1. оба вида получают преимущества; 2. вид 1 получает преимущество, а вид 2 подавляется; 3. вид 1 подавляется, а вид 2 получает преимущество. Обсуждается зависимость этих результатов от прочности взаимосвязей между изменением фенологической сепарации и изменением величины продукции семян.

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