Coexistence of perlid stoneflies (plecoptera): Predictions from multivariate morphometrics

Sheldon, Andrew L.

doi:10.1007/bf00005833

Cited by 12 publications

(7 citation statements)

References 18 publications

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“…Interspecific and intersexual differences in the size of the feeding apparatus in relation to body measures could help to explain differences in feeding modes (cf. Sheldon, 1980). Size overlap (SO) was estimated in order to identify time and extent of co-occurrence of similar-sized nymphs of the two species, which if hunting size-selectively could potentially compete for food.…”

Section: Methodsmentioning

confidence: 99%

“…to be realized through a staggering of life histories However, the extent that such segregation actually reduces competition is rarely demonstrated. Sheldon (1980) demonstrated that coexistence among predatory perlid stoneflies was facilitated through morphometric differences between species, indicating that one of Grant and Mackay's assumptions was in fact invalid.…”

Section: Introductionmentioning

confidence: 99%

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The diet of two species of Isoperla (Plecoptera: Perlodidae) in relation to season, site, and sympatry

Malmgvist

Sjöström²,

Frick

1991

Hydrobiologia

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The seasonal change in gut contents of nymphs of Isoperla grammatica and I. di#formis from six streams in southern Sweden was analysed. Both species had ingested a variety of benthic prey and vegetable matter, predominantly diatoms. Some seasonality was evident with high percentages of diatoms in spring in I. grammatica, and in autumn in I. dzfformis. The scope of food was larger in the latter species which contained about equal proportions of vegetable matter, chironomids, mayfly, stonefly, and black fly larvae. In I. grammatica plant matter and chironomids dominated strongly, comprising > 50% of the gut contents on an annual basis, > 90% in spring. While small nymphs of I. dfformis contained a low proportion of animal matter, only gradually increasing with size, the nymphs of I. grammatica were carnivorous from very early instars. Both species switched to a temporarily strong utilization of algae in spring. This differed among sites, and appeared to reflect differences in insolation and thus the availability of algae. There was a significant negative relationship between the mean densities of Isoperla nymphs and the proportion of animal material found in the guts of I. grammatica (R2 = 0.86). Considering the density of I. grammatica alone, the relationship was weaker (R2 = 0.56). A positive correlation between predator and prey size was observed. With chironomid prey the size range increased with predator size. With simuliid prey, however, prey size increased with predator size in such a way that it suggests selection rather than just an expanding prey size range. Correlations were stronger and regression coefficients significantly higher for I. grammatica than for I. dfformis. We suggest that I. grammatica, which ingests a much wider size range of prey might choose prey of optimal sizes more readily than the more synchronously developing I. difformis. Although the life cycles of the two species are staggered, overlap in size distribution indicates that competition for food could be important in spring. However, observed differences in diet should facilitate coexistence. Gut content differences might in turn be accomplished through microhabitat segregation.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The diet of two species of Isoperla (Plecoptera: Perlodidae) in relation to season, site, and sympatry

Malmgvist

Sjöström²,

Frick

1991

Hydrobiologia

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“…He attributed the non-random spacing of these niches, and the relatively constant degree of morphological overlap, to the role of competition in constraining species packing. Sheldon (1980b) takes a different approach to the problem, by first quantifying the morphometric similarity of various perlid stonef1ies living in the western U.S. He used these patterns of similarity to make predictions regarding which species should be capable of coexisting, demonstrating that greater morphometric similarity implies decreased likelihood of coexistence.…”

Section: General Null Modelsmentioning

confidence: 99%

Stream Ecology

1983

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“…Palmer etal, 1993). Referring to topographies, Sheidon (1969, 1980 pointed out how different sized nymphs can occupy different substratum types and crevices of different dimensions.…”

Section: Introductionmentioning

confidence: 99%

Size‐related shifts in the physical habitat of two mayfly species (Ephemeroptera)

1995

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1. The spatial niche shifts of the nyn^phs of two mayfly species [Rhithrogena semicolorata and Ecdyonurus sp. gr. venosus) in relation to their growth were investigated in two lowland springs of northern Italy where they are dominant species. 2. Ordination of the different size classes of the two species revealed a canonical trend related to season and bottom roughness. 3. Larger nymphs of both species colonized rougher substrata. Differences between species in the roughness of areas colonized by small nymphs, which were very numerous, may have been due to competition for space.

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Coexistence of perlid stoneflies (plecoptera): Predictions from multivariate morphometrics

Cited by 12 publications

References 18 publications

The diet of two species of Isoperla (Plecoptera: Perlodidae) in relation to season, site, and sympatry

The diet of two species of Isoperla (Plecoptera: Perlodidae) in relation to season, site, and sympatry

Stream Ecology

Size‐related shifts in the physical habitat of two mayfly species (Ephemeroptera)

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