Temporal variation in life-history traits of the clam Tivela mactroides (Bivalvia: Veneridae): Density-dependent processes in sandy beaches

2014 ◽  
Vol 150 ◽  
pp. 157-164 ◽  
Author(s):  
Alexander Turra ◽  
Marcelo Petracco ◽  
A.Cecilia Z. Amaral ◽  
Márcia R. Denadai
Keyword(s):  
Life History ◽  
Temporal Variation ◽  
Life History Traits ◽  
Sandy Beaches ◽  
Density Dependent ◽  
Dependent Processes

Lack of relationship between simulated fish population responses and their life history traits: inadequate models, incorrect analysis, or site-specific factors?

2005 ◽  
Vol 62 (4) ◽  
pp. 886-902 ◽  
Author(s):  
Kenneth A Rose
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Lake Trout ◽  
Fish Population ◽  
Population Models ◽  
Site Specific ◽  
Density Dependent ◽  
Population Responses ◽  
Adult Growth ◽  
Specific Factors

Relationships between fish population responses to changes in their vital rates and commonly available life history traits would be a powerful screening tool to guide management about species vulnerability, to focus future data collection on species and life stages of concern, and to aid in designing effective habitat enhancements. As an extension of previous analyses by others, I analyzed the responses to changes in fecundity and yearling survival of age-structured matrix and individual-based population models of 17 populations comprising 10 species. Simulations of the matrix models showed that the magnitude of population responses, but not the relative order of species sensitivity, depended on the state (sustainable or undergoing excessive removals) of the population. Matrix and individual-based models predicted population responses that appeared to be unrelated to their species-level life history traits when responses were plotted on a three-end-point life history surface. Density-dependent adult growth was added to the lake trout (Salvelinus namaycush) matrix model, and simulations demonstrated the potential importance to predicted responses of density-dependent processes outside the usual spawner–recruit relationship. Four reasons for the lack of relationship between population responses and life history traits related to inadequate population models, incorrect analysis, inappropriate life history model, and important site-specific factors are discussed.

scholarly journals Integrative developmental ecology: a review of density-dependent effects on life-history traits and host-microbe interactions in non-social holometabolous insects

2020 ◽  
Vol 34 (5) ◽  
pp. 659-680 ◽  
Author(s):  
Anh The Than ◽  
Fleur Ponton ◽  
Juliano Morimoto
Keyword(s):  
Population Dynamics ◽  
Life History ◽  
Life History Traits ◽  
Larval Density ◽  
Future Research ◽  
Density Dependent ◽  
Integrative Framework ◽  
Wide Range ◽  
Microbe Interactions ◽  
Host Microbe Interactions

Abstract Population density modulates a wide range of eco-evolutionary processes including inter- and intra-specific competition, fitness and population dynamics. In holometabolous insects, the larval stage is particularly susceptible to density-dependent effects because the larva is the resource-acquiring stage. Larval density-dependent effects can modulate the expression of life-history traits not only in the larval and adult stages but also downstream for population dynamics and evolution. Better understanding the scope and generality of density-dependent effects on life-history traits of current and future generations can provide useful knowledge for both theory and experiments in developmental ecology. Here, we review the literature on larval density-dependent effects on fitness of non-social holometabolous insects. First, we provide a functional definition of density to navigate the terminology in the literature. We then classify the biological levels upon which larval density-dependent effects can be observed followed by a review of the literature produced over the past decades across major non-social holometabolous groups. Next, we argue that host-microbe interactions are yet an overlooked biological level susceptible to density-dependent effects and propose a conceptual model to explain how density-dependent effects on host-microbe interactions can modulate density-dependent fitness curves. In summary, this review provides an integrative framework of density-dependent effects across biological levels which can be used to guide future research in the field of ecology and evolution.

The habitat harshness hypothesis revisited: life history of the isopod Excirolana braziliensis in sandy beaches with contrasting morphodynamics

2003 ◽  
Vol 83 (2) ◽  
pp. 331-340 ◽  
Author(s):  
Omar Defeo ◽  
Gastón Martínez
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Wide Spectrum ◽  
Abiotic Factors ◽  
Strong Support ◽  
Sandy Beaches ◽  
Physical Conditions ◽  
Large Populations ◽  
History Of ◽  
Pan American

Demographic and life history characteristics of the intertidal isopod Excirolana braziliensis (Isopoda: Cirolanidae) were compared between populations of two exposed sandy beaches with contrasting morphodynamics (reflective vs dissipative) during 22 consecutive months. Most population processes and life history traits did not give support for the ‘habitat harshness hypothesis’ (HHH): abundance of males, females, ovigerous females and juveniles was significantly higher at the reflective beach population, which also presented higher growth rates in size and weight with respect to the dissipative beach population. No significant differences in weight-at-length were found between beaches. Among the compared parameters, only the lower natural mortality rates at the dissipative beach gave support for the HHH. The results were not consistent with a previous analysis of Excirolana braziliensis along Pan-American beaches, which showed that this isopod occurs almost invariably in fine sands of tropical and temperate beaches. The results give strong support to recent findings that show that in macrofauna species capable of sustaining large populations across a wide spectrum of physical conditions, such as Excirolana braziliensis, beach morphodynamics should not be considered the primary factor affecting abundance and life history traits. Instead, our results reinforce the view that sandy beach populations are controlled by the intertwined forces of biotic and abiotic factors operating together.

Density-Dependent Evolution of Life-History Traits in Drosophila Melanogaster

Evolution ◽  
1989 ◽  
Vol 43 (2) ◽  
pp. 382 ◽  
Author(s):  
Todd J. Bierbaum ◽  
Laurence D. Mueller ◽  
Francisco J. Ayala
Keyword(s):  
Drosophila Melanogaster ◽  
Life History ◽  
Life History Traits ◽  
Density Dependent ◽  
Evolution Of Life

Spatial and temporal variation in superfoetation and related life history traits of two viviparous fishes: Poeciliopsis gracilis and P. infans

2014 ◽  
Vol 101 (12) ◽  
pp. 1085-1098 ◽  
Author(s):  
Patricia Frías-Alvarez ◽  
Constantino Macías Garcia ◽  
Luis F. Vázquez-Vega ◽  
J. Jaime Zúñiga-Vega
Keyword(s):  
Life History ◽  
Temporal Variation ◽  
Life History Traits ◽  
Spatial And Temporal Variation

scholarly journals What do we know about the life-history traits of widely hunted tropical mammals?

Oryx ◽  
2018 ◽  
Vol 53 (4) ◽  
pp. 670-676
Author(s):  
Nathalie van Vliet ◽  
Robert Nasi
Keyword(s):  
Life History ◽  
Species Distribution ◽  
Life History Traits ◽  
Local People ◽  
Mammal Species ◽  
Density Dependent ◽  
Distribution Ranges ◽  
Technical Innovations ◽  
Parameter Values

AbstractWe synthesize information on parameters useful for managing the hunting of two common mammal species that are important for local people in the Neotropics and Africa: Cuniculus paca and Philantomba monticola, respectively. We highlight the scarcity of data available on the parameters needed to manage these two species sustainably. As most of the studies were conducted > 40 years ago, we stress the need to supplement the information available using methodological and technical innovations. In particular, we call for new assessments covering the possible variations in parameter values across the species’ distribution ranges, and covering various anthropogenic contexts, to test density-dependent and compensatory processes that may explain the resilience of these species to hunting.

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