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Effects of Vegetation on Notonecta (Hemiptera) Distribution in Ponds with and without Fish

Donald V. Bennett and Frederick A. Streams
Oikos
Vol. 46, No. 1 (Feb., 1986), pp. 62-69
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3565381
Stable URL: http://www.jstor.org/stable/3565381
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Vegetation on Notonecta (Hemiptera) Distribution in Ponds with and without Fish
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Abstract

The distribution of Notonecta in relation to aquatic vegetation and water depth was studied in two ponds, one with predaceous fish, another without. Notonectid density was lower but the number of species was greater in the pond with fish. The dominant species in the fish pond (N. lunata) was strongly associated with vegetation throughout its life cycle, while the dominant species in the pond without fish (N. undulata) was associated with vegetation only during the early instars. N. undulata also occurred in the pond with fish, but at greatly reduced densities. The overall distribution of the two dominant notonectid species was random among the three water depth classes studied (< 15 cm, 15-30 cm, 30-65 cm) in both ponds. Each pond also contained a large notonectid species in low densities. The large species in the pond without fish (N. insulata) was characteristically found in open, deeper water where the substrate was bare or sparsely vegetated. The large species in the fish pond (N. irrorata) appeared to be randomly distributed with respect to vegetation density and water depth, and was mainly restricted to heavily shaded parts of the habitat. /// Распределение Notonecta в зависимости от водной растительности и глубины во-ды исследовали в двух прудах, один - с хищной рыбой другой - без нее. Чис-ленность Notonectidae была ниже, но число видов больше в пруду с рыбой. До-минирующий вид в пруду с рыбой N. lunata был тесно связан с растительностью в течение всего жизненного цикла, a доминирующий вид в пруду без рыбы N. indulata - лишь в ранних возрастах. N. indulata вчтречался также в пруду с хищной рыбой, но с пониженной численностью. Общее распределение двух доми-нантных видов было случайным в трех классах исследованных водных слоев (< 15см, 15-30 см и 30-65 см) в обоих прудах. Крупный вид в пруду без рыбы N. insulata был характерен для открытых, более глубоких участков с обна-женным или покрытым редкой растительностью субстратом. Крупный вид в пру-ду с рыбой N. irrorata имел рандомическое распределение в отношении гус-тоты растительности и глубины воды и в основном ограничен сильно затенен-ными участками.

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