Ecological Studies of Sessile Rotatoria, Part II: Dynamics of Populations and Social Structures

Edmondson, W. T.

doi:10.2307/1948601

Cited by 76 publications

(53 citation statements)

References 12 publications

(20 reference statements)

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“…After having settled they have to stay on the same spot for all their adult life, and thus they ought to be very selective as regards their substrate and habitat. Such a selectivity has often been found in previous investigations (Edmondson, 1940(Edmondson, , 1944(Edmondson, and 1945Wallace, 1977aWallace, , 1977bWallace, , 1977cWallace, , 1978Wallace, and 1980Wallace & Edmondson, 1986Francez, 1984a7 1984b, Koste & Poltz, 1984. In the present paper the substrate choice is reported for the material collected by Bruno BErzipS during the years 1945-1982 from various types of water bodies in southern Sweden.…”

Section: Introductionsupporting

confidence: 72%

On relation to substrate in sessile rotifers

Pejler¹,

Bērziņš²

1993

Hydrobiologia

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Information on the distribution of 45 sessile rotifers from diverse freshwaters in south and central Sweden was analyzed to reveal possible relationships to their substrates. Almost all of them showed an exclusively periphytic occurrence. The highest number of species was found on Utricularia, but otherwise it was not possible to correlate rotifer presence to any special macrophyte or category of plants (e.g., fine-leaved or floating-leaved species).

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Section: Introductionsupporting

confidence: 72%

On relation to substrate in sessile rotifers

Pejler¹,

Bērziņš²

1993

Hydrobiologia

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“…For the non-pelagic Notommata copeus, Pourriot and Clement (1975) reported a n r, of 0.47 d-l at 23 "C. Similarly, the sedentary species Floscularia conifera, studied by Edmondson (1945), must have a very low intrinsic growth rate. For other sessile or benthic rotifers, very low numbers of eggs were observed (Remane, 1929) which were not accompanied by extraordinarily short generation times (cf.…”

Section: Resultsmentioning

confidence: 97%

Mass-Scaled Rates of Respiration and Intrinsic Growth in Very Small Invertebrates

Banse¹

1982

Mar. Ecol. Prog. Ser.

126

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This review compares rates of oxygen uptake and intrinsic growth of very small invertebrate species near 20 "C with those of larger invertebrate and unicellular animals by means of the allometric relation (rate a Mb where M = mass). Respiration rates of small species of major invertebrate taxa are lower than those extrapolated for larger invertebrates but generally higher than those for protozoans of the same mass. Mass-specific rates of small metazoans and protozoans are lowered accordingly; therefore, their total food and oxygen consumption is likely to be small relative to that of large metazoans in average pelagic and benthic communities where most of the biomass is in large animals. The exponent b for each of the major taxa treated here tends to be near 0.75 rather than close to unity. Thus, the respiration of these taxa is about as mass dependent as that of large animals. Metabolic reduction is set in relation to small adult size as such, and previous inferences about the phylogeny of metazoan metabolism do not seem warranted any more. Intrinsic growth rates of benthic rotifers and marine free-living nematodes are not only lower than those extrapolated for larger invertebrates but fall below those for protozoans of the same mass. Among benthic harpacticoid copepods, a slight reduction relative to mass-scaled large invertebrates is indicated. Pelagic freshwater rotifers do not exhibit this reduction. Intrinsic growth rates of pelagic freshwater cladocerans are independent of adult mass and not clearly higher than those of the few pelagic copepods studied. Future research into the physiological reasons for mass dependence of metabolism and growth should focus on unicellular or small multicellular species because of their short generation times

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“…I I (Laws, 1968) African elephant (Loxodonta africana) female (Corfield, 1973) Herring gull (Larus argentatus smithsonianus) (Paynter, 1966) Lapwing (Venellus vanellus) (Lack, 1954) Great tit (Parus major) male (Bulmer, 1973) female North American Mallard (Anas platyrhynchos) (Hickey, 1972) Blue jay (Cyanocitta cristata) (Bulmer and Perrins, 1973) Lake trout (Cristivomer namaycush) (Deevey, 1947) Sessile rotifer (Floscularia coniferia (Edmondson, 1945) Barnacles (Balanus balanoides) (Deevey, 1947 Figure 1 illustrates this method of analysis using data on male impalas. For the actual population, the mortality rate decreases from birth up to the fourth year and then increases sharply.…”

Section: Methodsmentioning

confidence: 99%

Life table tests of evolutionary theories of senescence

Nesse

1988

Experimental Gerontology

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-The phenomenon of senescence requires both evolutionary and proximate explanations. The most widely accepted evolutionary explanation for senescence is that it never gets exposed to natural selection because environmental hazards kill all individuals before the age at which senescence causes decreased fitness. If this explanation is sufficient, wild populations should not demonstrate senescence, and their mortality rates should therefore remain constant during adult life, except when environmental causes of mortality have recently decreased. The alternative explanation for the persistence of the genes that cause senescence is that they have been selected for because they have pleiotropic effects that are beneficial early in life when the force of selection is strongest. Where this is the case, mortality rates should increase with age in wild populations. A method is described for using life table data to calculate an estimate of the intensity of selection acting on senescence in wild populations. This method is applied to a variety of life tables. The results suggest that pleiotropic genes may be important causes of senescence in some populations, but not in others. This has implications for research on the proximate mechanisms of senescence.

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Ecological Studies of Sessile Rotatoria, Part II: Dynamics of Populations and Social Structures

Cited by 76 publications

References 12 publications

On relation to substrate in sessile rotifers

On relation to substrate in sessile rotifers

Mass-Scaled Rates of Respiration and Intrinsic Growth in Very Small Invertebrates

Life table tests of evolutionary theories of senescence

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