Erratum to “Population growth versus population spread of an ant-dispersed neotropical herb with a mixed reproductive strategy” [Ecol. Model. 188 (1) (2005) 41–51]

2006 ◽  
Vol 195 (3-4) ◽  
pp. 409
Author(s):  
Josiane Le Corff ◽  
Carol C. Horvitz
Keyword(s):  
Population Growth ◽  
Reproductive Strategy ◽  
Population Spread ◽  
Mixed Reproductive Strategy

Twinning and the r/K Reproductive Strategy: A Critique of Rushton's Theory

1992 ◽  
Vol 41 (1) ◽  
pp. 73-83 ◽  
Author(s):  
G. Allen ◽  
A.W. Eriksson ◽  
J. Fellman ◽  
P. Parisi ◽  
S.G. Vandenberg
Keyword(s):  
Environmental Factors ◽  
Population Growth ◽  
Parental Care ◽  
Ethnic Groups ◽  
Ethnic Differences ◽  
Reproductive Strategy ◽  
Reproductive Strategies ◽  
Human Populations ◽  
Efficient Utilization ◽  
Mode Of Reproduction

AbstractThe theory of r selection, favoring population growth, as opposed to K selection, favoring more efficient utilization of resources, has in recent years been applied by Rushton to contrast human ethnic groups in terms of their r/K reproductive strategies, suggesting the existence of a continuum from r groups, producing many offspring but providing little parental care, to K groups, producing few offspring but providing much parental care. Rushton's theory, which is largely based on ethnic differences in twinning rates, is here critically examined. It is pointed out that twinning rate differences are not necessarily genetic in origin since various environmental factors clearly play a role, and also that twinning, as a mode of reproduction, is not necessarily an r strategy, considering the high prenatal and perinatal selection to which it has been, and still is, associated. Moreover, Rushton misinterprets a number of relevant aspects related to the biology of twinning. The claim that ethnic differences in twinning rates provide evidence for an r/K typology in human populations with respect to reproductive strategies does not appear to be warranted.

scholarly journals Palaeoecology of a hypersaline Carboniferous ostracod fauna

1987 ◽  
Vol 6 (2) ◽  
pp. 29-33 ◽  
Author(s):  
Chris P. Dewey
Keyword(s):  
Nova Scotia ◽  
Population Growth ◽  
Reproductive Strategy ◽  
Growth Parameters ◽  
High Abundance ◽  
Rapid Population Growth ◽  
Lower Carboniferous ◽  
Low Diversity ◽  
Combined Data

Abstract. A high abundance, low diversity ostracod fauna has been collected from the Lower Carboniferous Dimock and Phillips limestones in Nova Scotia, Canada. The ostracod fauna consists of Paraparchites sp. aff. P. kellettae Sohn and Beyrichiopsis lophota Copeland, as well as rare specimens of Acratia acuta (Jones & Kirkby), Bythocypris aequalis (Jones & Kirkby), and Chamishaella suborbiculata (Munster).Growth parameters for the dominant ostracod, Paraparchites sp. aff. P. kellettae, show that a multi-generation, progenetic, parthenogenetic population developed. This reproductive strategy caused rapid population growth and thereby allowed the species to take advantage of the available environmental resources.When considered together, the ostracod fauna and the sedimentology indicate that physiologically stressful hypersaline conditions prevailed. The combined data therefore provide evidence for hypersalinity tolerance and heterochronous development amongst Carboniferous ostracods.

Requirements for a Mixed Reproductive Strategy in Avian Species

1984 ◽  
Vol 124 (1) ◽  
pp. 116-126 ◽  
Author(s):  
Mary A. Fitch ◽  
Gary W. Shugart
Keyword(s):  
Reproductive Strategy ◽  
Avian Species ◽  
Mixed Reproductive Strategy

scholarly journals Density-dependent effects control the reproductive strategy and population growth of Aurelia aurita s.l. scyphistomae

2015 ◽  
Vol 162 (8) ◽  
pp. 1665-1672 ◽  
Author(s):  
Agustin Schiariti ◽  
Valentina Melica ◽  
Tjaša Kogovšek ◽  
Alenka Malej
Keyword(s):  
Population Growth ◽  
Reproductive Strategy ◽  
Aurelia Aurita ◽  
Density Dependent

scholarly journals Working smarter, not harder: objective-dependent management of an invasive thistle, Carduus nutans

2019 ◽  
Vol 12 (03) ◽  
pp. 155-160
Author(s):  
Rui Zhang ◽  
Katriona Shea
Keyword(s):  
Invasive Species ◽  
Population Growth ◽  
High Intensity ◽  
Effective Management ◽  
Carduus Nutans ◽  
Management Objectives ◽  
Population Spread ◽  
Explicit Statement ◽  
Using Data

AbstractMany invasive species managers state that their objective is to “control” an invader. However, the appropriate choice of a management option requires a more explicit statement of management objectives, in terms of both the relevant time horizon and spatial scale. Using data from a 2-yr mowing experiment, we show that the most effective management strategy for controlling an invasive thistle depends fundamentally on the management goals. We integrate field data from a two-cohort experiment with modeling to assess 14 mowing treatments (differing in intensity, frequency, and timing, and thus also in their required logistical effort) based on their effectiveness in (1) reducing population density of the existing cohort, (2) decreasing projected long-term population growth, and (3) limiting projected population spread of an invasive thistle, musk thistle (Carduus nutans L.). The treatment with high intensity and a single late mow caused the largest reduction in plant survival (and density of existing adult plants); the treatment with high intensity and an early mow in addition to a late mow was most effective at reducing population growth rate and population spread. Against expectation and conventional wisdom, the most frequent mowing treatment did not provide the most effective management outcome for any stated objective. This study highlights the necessity of clearly defined management aims; the term “control” is too vague to be truly useful. The results also provide important insights for the management of this invasive species.

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