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Effect of Bird Predation on Lumbricid Populations

S.-A. Bengtson, A. Nilsson, S. Nordström and S. Rundgren
Oikos
Vol. 27, No. 1 (1976), pp. 9-12
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3543424
Stable URL: http://www.jstor.org/stable/3543424
Page Count: 4
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Effect of Bird Predation on Lumbricid Populations
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Abstract

The effects of predation by golden plover Pluvialis apricaria (L.) on populations of Allolobophora caliginosa (Sav.) and Lumbricus rubellus Hoffm. in early spring on a hayfield in Iceland were estimated by two independent methods. Field experiments (lasting for 22 days) with nets preventing bird predation showed that the mean abundance of lumbricids was 238 ind m-2 on protected sites and 107 ind m-2 on exposed sites (P < 0.001). Observations of feeding plovers showed that about 4.5 lumbricids were taken per m2 and day; i.e. about 100 ind m-2 in the experimental period. This agrees closely with the result obtained by the first method. No selective predation could be confirmed but certain differences between the two species of lumbricids are discussed. /// Исследовано влияние ржанок Pluvialis apricaria (L.) на популяции Allolobophora caliginosa (Sav.) и Lumbricus rubellus Hoffm. ранней весной на косимом лугу в Исландии двумя независимыми методами. Полевые эксперименты/длительностью 22 дня/ с сетками, предохраняющими от птиц, показали, что среднее обилие червей составляло 238 экз./ m2 в защищенных участках и 107 экз./ m2 - на открытых /Р < 0,001/. Наблюдения за питающимися ржанками показали, что они съедают примерно 4,5 червей/ m2/сут., т.е. около 100 экз./ m2 в течение эксперимента. Это вполне соответствует результатам, попученным первым методом. Наличие избирательного питание не подтвердилось, однако, обсуждаются некоторые различия между двумя видами червей.

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