Estimation of Insect Population Density in Herbaceous Vegetation with Emphasis on Removal Sweeping

Menhinick, Edward F.

doi:10.2307/1932555

Cited by 27 publications

(15 citation statements)

References 4 publications

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“…The collections were made during the morning, always on sunny, near windless days to minimize sampling variations due to environmental factors (Menhinick 1963, Southwood 1966) and possible diurnal vertical movements of insects (Andrzejewska 1965). Sweep sampling was chosen because of its relative ease and the ability to sample over the whole experimental plot, avoiding the heterogeneity problem of small sample size.…”

Section: Arthropod Samplingmentioning

confidence: 99%

“…Samples were collected from both grass habitats inside each experimental plot at low tide, about every 3 wk through the summer of 1974. The collections were made during the morning, always on sunny, near windless days to minimize sampling variations due to environmental factors (Menhinick 1963, Southwood 1966 and possible diurnal vertical movements of insects (Andrzejewska 1965). One step forward was taken with each stroke, and the sweep transects did not overlap.…”

Section: Arthropod Samplingmentioning

confidence: 99%

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An Experimental Study of the Structure of Herbivorous Insect Communities in a Salt Marsh

Vince¹,

Valiela²,

Teal³

1981

Ecology

135

116

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Factors regulating the numbers and species of herbivorous insects in a salt marsh were experimentally investigated by chronic fertilization of plots. All biweekly nutrient enrichments (urea or three dosages of a mixed fertilizer) resulted in increased grass standing crop in low and high marsh habitats. Plant nitrogen content increased only in those plots receiving the two highest levels of mixed fertilizer. Grass responses were most rapid where the highest nutrient load was applied.In all plots, fertilization resulted in increased standing crop of low and high marsh insect herbivores. However, the greatest herbivore loads occurred where grass nitrogen content as well as standing crop had increased. Life history data and laboratory experiments indicated that the herbivore increases were largely due to in situ changes in survivorship and fecundity in response to higher plant nitrogen content. The herbivore response to fertilization was rapid, tracking in a single summer the nutrient and biomass changes of the grasses. The rate of increase, however, differed among herbivore species, and was positively related to the annual number of generations.Nutrient additions did not alter the diversity of the high marsh herbivore community, but led to increased diversity in low marsh. This was achieved primarily through greater equitability of the species abundances. All of the herbivore species collected in the fertilized plots occurred in the undisturbed salt marsh. The low marsh herbivore community responded to fertilization mainly with greater numbers of mirids, cicadellids, and grasshoppers, although normally dominated by the delphacid Prokelisia marginata. Potential increases in number of P. marginata in response to fertilization were apparently checked by the increased abundance of spiders. The delphacids were more susceptible to spider predation than other salt marsh herbivores, due to their small size and low position in the grass canopy. Plant nutritional quality is of major importance in governing the abundance of salt marsh herbivores, with life history characteristics and predation interacting to structure the community.

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Section: Arthropod Samplingmentioning

confidence: 99%

Section: Arthropod Samplingmentioning

confidence: 99%

An Experimental Study of the Structure of Herbivorous Insect Communities in a Salt Marsh

Vince¹,

Valiela²,

Teal³

1981

Ecology

135

116

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“…In 250 sweeps he found 605 mg dry wgt of insects. If 63 sweeps sample a m 2 as in lespedeza (Menhinick 1963), then there were 14.4 mgj111 2 of insects. Connell (1960) found that orthoptera, one of the commonest groups of insects, consumed 0.09 gjgjday in the laboratory.…”

Section: Gross Productionmentioning

confidence: 99%

Structure and Function of an Old‐Field Broomsedge Community

Golley¹

1965

Ecological Monographs

118

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“…My subjective summaries of the habitat features that I believe to be important about each sample site are given. At the low level of resolution demanded of the data in the present study (Janzen 1973), we may ignore the types of dissatisfaction with sweep samples that have been expressed by previous authors (deLong 1932, Beall 1935, Carpenter 1936, Rice 1946, Whittaker 1952, Hughes 1955, Crossley and Howden 1961, Dempster 1961, Menhinick 1963, Southwood 1966, Lowrie 1971. This unusual format was suggested to me by an editor ( M. L. ).…”

mentioning

confidence: 69%

Sweep Samples of Tropical Foliage Insects: Description of Study Sites, With Data on Species Abundances and Size Distributions

Jazen¹

1973

Ecology

134

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Estimation of Insect Population Density in Herbaceous Vegetation with Emphasis on Removal Sweeping

Cited by 27 publications

References 4 publications

An Experimental Study of the Structure of Herbivorous Insect Communities in a Salt Marsh

An Experimental Study of the Structure of Herbivorous Insect Communities in a Salt Marsh

Structure and Function of an Old‐Field Broomsedge Community

Sweep Samples of Tropical Foliage Insects: Description of Study Sites, With Data on Species Abundances and Size Distributions

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