The use of horn sections to determine the age of Sable <i>Hippotragus Niger</i>

1. Yearly records of worker Vespula germanica (Fabricius) taken in suction traps at Silwood Park (28 years) and at Rothamsted Research (39 years) are examined. 2. Using the autocorrelation function (ACF), a significant negative 1-year lag followed by a lesser non-significant positive 2-year lag was found in all, or parts of, each data set, indicating an underlying population dynamic of a 2-year cycle with a damped waveform. 3. The minimum number of years before the 2-year cycle with damped waveform was shown varied between 17 and 26, or was not found in some data sets. 4. Ecological factors delaying or preventing the occurrence of the 2-year cycle are considered.

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Aeneolamia Fennah, 1949 (Hemiptera: Cercopidae) attacks pastures in Roraima, with first report in Brazil

Entomological Communications ◽

10.37486/2675-1305.ec03055 ◽

2021 ◽

Vol 3 ◽

pp. ec03055

Author(s):

Elisangela G. Fidelis ◽

Gervásio S. Carvalho ◽

Regina Oliveira ◽

Rosinei A. Santos ◽

José R. Valério

Keyword(s):

Population Dynamic ◽

Dynamic Study ◽

First Report ◽

Insect Group

Spittlebugs (Hemiptera: Cercopidae) are the predominant pasture pests in Brazil, mainly the Amazonia region. Despite frequent reports of attacks by these spittlebugs in Roraima, information on this insect group is scarce. Therefore, we conducted surveys and a population dynamic study in pastures in Roraima from May 2015 to July 2019. We identified the spittlebugs Aeneolamia flavilatera (Urich, 1914) and Aeneolamia reducta montana (Lallemand, 1944). This is the first report of A. reducta montana in Brazil, and the first report of A. flavilatera attacking pastures. We discuss the possible impacts of these pests on Brazilian agriculture and livestock.

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On selection-regulated population dynamics in birds and mammals

10.1101/2021.11.27.470201 ◽

2021 ◽

Author(s):

Lars Witting

Keyword(s):

Growth Rate ◽

Population Dynamics ◽

Population Dynamic ◽

North American ◽

Dynamic Equilibrium ◽

New Paradigm ◽

Breeding Bird ◽

The North ◽

Dynamic Growth ◽

Dynamic Growth Rate

I use the North American Breeding Bird Survey (Sauer et al. 2017) to construct 462 population trajectories with about 50 yearly abundance estimates each. Applying AIC model-selection, I find that selection-regulated population dynamics is 25,000 (95%:0.42-1.7e17) times more probable than density-regulated growth. Selection is essential in 94% of the best models explaining 82% of the population dynamics variance across the North American continent. Similar results are obtained for 111, 215, and 420 populations of British birds (BTO 2020), Danish birds (DOF 2020), and birds and mammals in the Global Population Dynamic Database (GPDD 2010). The traditional paradigm---that the population dynamic growth rate is a function of the environment, with maximal per-capita growth at low population densities, and sub-optimal reproduction from famine at carrying capacities with strong competition for limited resources---is not supported. Selection regulation generates a new paradigm where the world is green and individuals are selected to survive and reproduce at optimal levels at population dynamic equilibria with sufficient resources. It is only the acceleration of the population dynamic growth rate, and not the growth rate itself, that is determined by the density-dependent environment, with maximal growth occurring at the densities of the population dynamic equilibrium.

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ARQUEOLOGÍA DE SUPERFICIE EN LA CUENCA LACUSTRE DEL TAMESI, HUASTECA SEPTENTRIONAL. Evidencias de la Dinámica Paleo Poblacional y Aprovechamiento del Espacio

CLIO – Arqueológica ◽

10.20891/clio.v34n2p1-56 ◽

2019 ◽

Vol 34 (2) ◽

pp. 1

Author(s):

Gustavo A. Ramírez Castilla

Keyword(s):

Population Dynamics ◽

Population Dynamic ◽

Archaeological Sites ◽

Lake Basin ◽

Use Of Space

Recorridos de superficie realizados en la cuenca lacustre del Tamesí (2007 a 2009), permitieron la localización y muestreo de 31 nuevos sitios arqueológicos. La identificación de cerámica diagnóstica con la aplicación de una tipología desarrollada para caracterizar la función y contexto de los sitios permite ofrecer un panorama de la dinámica de poblamiento para la zona de estudio, revelando un proceso que inició en el 900 a.C., deteniéndose drásticamente hacia el 200-400 d.C., quedando despoblada la región hasta que hacia el 900 d.C. comienza a repoblarse con gente ligada a Tula y Cholula. Después del año 1000 d.C. se introdujo con vigor la población propiamente llamada huasteca.SURFACE ARCHEOLOGY IN THE LACUSTRE BASIN OF TAMESI, NORTHERN HUASTECA. Evidence of the Paleo-population Dynamic and Use of Space ABSTRACTSurface surveys carried out in the Tamesí lake basin (2007 to 2009), allowed the location and sampling of 31 new archaeological sites. The identification of diagnostic ceramics with the application of a typology developed to characterize the function and context of the sites, allows to offer a panorama of the population dynamics for the study area, revealing a process that began in 900 BC, stopping drastically towards 200-400 AD, the region being depopulated until about 900 AD begins to repopulate with people linked to Tula and Cholula. After the year 1000 AD the population proper called huasteca was introduced with vigor.Keywords: Huasteca; Peopling; Contexts; Lacustrian; Basin; Altamira.

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Ecological theory of mutualism: Models generalizing across different mechanisms

10.1101/2020.10.25.343087 ◽

2020 ◽

Author(s):

Kayla R. S. Hale ◽

Daniel P. Maes ◽

Fernanda S. Valdovinos

Keyword(s):

Population Dynamics ◽

Ecosystem Services ◽

Population Dynamic ◽

Dynamic Models ◽

Historical Context ◽

Ecological Theory ◽

Population Level ◽

Competitive Interactions ◽

Specific Density ◽

Generalized Framework

AbstractMutualisms are ubiquitous in nature, provide important ecosystem services, and involve many species of interest for conservation. Theoretical progress on the population dynamics of mutualistic interactions, however, has comparatively lagged behind that of trophic and competitive interactions. Consequently, ecologists still lack a generalized framework to investigate the population dynamics of mutualisms. Here, we propose extensible models for two-species mutualisms focusing on nutritional, protection, and transportation mechanisms and evaluate the population-level consequences of those mechanisms. We introduce a novel theoretical framework that highlights characteristic dynamics when the effects of mutualism are directly dependent or independent of recipient density and when they saturate due to inter- or intra-specific density-dependence. We end by integrating our work into the broader historical context of population-dynamic models of mutualism and conclude that a general ecological theory of mutualism exists.

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Dingoes in North-Western Australia.

Wildlife Research ◽

10.1071/wr9920509 ◽

1992 ◽

Vol 19 (5) ◽

pp. 509 ◽

Cited By ~ 6

Author(s):

PC Thomson ◽

K Rose ◽

NE Kok

Keyword(s):

Population Dynamics ◽

Social Organization ◽

Western Australia ◽

Activity Patterns ◽

Age Determination ◽

Behavioural Ecology ◽

Hunting Behaviour ◽

North Western

This issue comprises 8 papers by P. C. Thomson (some in collaboration with K. Rose and N. E. Kok) on the dingo in North Western Australia. They cover the behavioural ecology including activity patterns, diet, hunting behaviour, social organization, population dynamics, dispersal, age determination and immobilization using darts fired from an aircraft.

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Otolith science entering the 21st century

Marine and Freshwater Research ◽

10.1071/mf04147 ◽

2005 ◽

Vol 56 (5) ◽

pp. 485 ◽

Cited By ~ 167

Author(s):

Steven E. Campana

Keyword(s):

Population Dynamics ◽

Larval Fish ◽

Age Determination ◽

Age And Growth ◽

Fish Ecology ◽

Otolith Chemistry ◽

Otolith Microstructure ◽

Otolith Growth ◽

Physiologically Based ◽

Subject Areas

A review of 862 otolith-oriented papers published since the time of the 1998 Otolith Symposium in Bergen, Norway suggests that there has been a change in research emphasis compared to earlier years. Although close to 40% of the papers could be classifed as ‘annual age and growth’ studies, the remaining papers were roughly equally divided between studies of otolith microstructure, otolith chemistry and non-ageing applications. A more detailed breakdown of subject areas identified 15 diverse areas of specialisation, including age determination, larval fish ecology, population dynamics, species identification, tracer applications and environmental reconstructions. For each of the 15 subject areas, examples of representative studies published in the last 6 years were presented, with emphasis on the major developments and highlights. Among the challenges for the future awaiting resolution, the development of novel methods for validating the ages of deepsea fishes, the development of a physiologically-based otolith growth model, and the identification of the limits (if any) of ageing very old fish are among the most pressing.

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