Differences in population parameters of Rattus norvegicus in urban and rural habitats of central Argentina

Mammalia ◽  
2013 ◽  
Vol 77 (2) ◽  
Author(s):  
Isabel E. Gómez Villafañe ◽  
Regino Cavia ◽  
María Victoria Vadell ◽  
Olga V. Suárez ◽  
María Busch
Keyword(s):  
Life History ◽  
Rattus Norvegicus ◽  
Abiotic Factors ◽  
Life History Strategies ◽  
Population Parameters ◽  
Biotic And Abiotic Factors ◽  
Central Argentina ◽  
Life History Characteristics

AbstractLife history characteristics are influenced by both biotic and abiotic factors of the environment. The aim of this study was to compare the life history strategies of

scholarly journals Relative effects of biotic and abiotic factors during early life history on recruitment dynamics: a case study

2017 ◽  
Vol 74 (7) ◽  
pp. 1125-1134 ◽  
Author(s):  
Fan Zhang ◽  
Kevin B. Reid ◽  
Thomas D. Nudds
Keyword(s):  
Life History ◽  
Yellow Perch ◽  
Lake Erie ◽  
Abiotic Factors ◽  
Zooplankton Abundance ◽  
Biotic Factors ◽  
Large Lakes ◽  
Middle Term ◽  
Biotic And Abiotic Factors ◽  
Juvenile Stages

The relative effects of biotic and abiotic factors, and the life-history stages upon which they act to affect fish recruitment, vary among species and ecosystems. We compared the effects of spawning stock biomass, and factors operating at early-term (encompassing the egg, yolk-sac larval, and first few days of swim-up larval stages), middle-term (including the swim-up larval and pelagic juvenile stages), and late-term (over the benthic juvenile stage) on recruitment by yellow perch (Perca flavescens) in the western basin of Lake Erie between 1999 and 2013. Variation of recruitment was mainly driven by middle-term effects. Then, abiotic factors, such as warming rate and wind speed, more strongly affected recruitment than did biotic factors. Among middle-term biotic factors, the top-down effect of yearling walleye (Sander vitreus) abundance was stronger than the bottom-up effect of zooplankton abundance. Similar to marine species, physical processes appear to strongly affect recruitment dynamics of Lake Erie yellow perch over its pelagic larval and juvenile stages, demonstrating the importance of physical and biological processes in understanding fish population dynamics in large lakes.

Corrigendum to: Differences in population parameters of Rattus norvegicus in urban and rural habitats of central Argentina

Mammalia ◽  
2015 ◽  
Vol 79 (2) ◽  
Author(s):  
Isabel E. Gómez Villafañe ◽  
Regino Cavia ◽  
María Victoria Vadell ◽  
Olga V. Suárez ◽  
María Busch
Keyword(s):  
Rattus Norvegicus ◽  
Population Parameters ◽  
Central Argentina

Potential, realized, and actual fecundity in the crayfish Orconectes immunis from southwestern Ontario

1995 ◽  
Vol 73 (4) ◽  
pp. 672-677 ◽  
Author(s):  
Daniel P. M. Stechey ◽  
Keith M. Somers
Keyword(s):  
Life History ◽  
Abiotic Factors ◽  
Stage Iv ◽  
Reproductive Stage ◽  
Analysis Of Covariance ◽  
Biotic And Abiotic Factors ◽  
Reproductive Losses

Data on crayfish life history are limited to a few populations of only a few species. Herein we examine the size-specific fecundity of a population of Orconectes immunis from southwestern Ontario. We compare log–log regressions of ovarian egg counts, abdominal egg counts, and the number of independent stage IV juveniles with the size of females to estimate reproductive losses associated with egg extrusion and hatching. We contrast these results with data from a Michigan population. Slopes of the three allometric regressions for the Ontario population were significantly greater than zero (P < 0.05); however, the slope for the ovarian egg counts was significantly less than the hypothesized value of 3.0 (P < 0.05), suggesting that ovarian egg counts did not scale volumetrically with size of females. An analysis of covariance indicated that the slope for the ovarian egg counts differed significantly from the slopes for abdominal egg counts and the number of juveniles (P < 0.05), but the latter two regressions were parallel. The proportional decline in fecundity between ovarian and abdominal egg counts could not be estimated unequivocally because the slopes differed. By contrast, the Michigan population exhibited a 35% decline between these stages. A comparison of size-adjusted abdominal egg counts and the number of juveniles revealed a decline of 58% for the Ontario population. The observed differences in size-specific fecundity at each reproductive stage support the hypothesis that each of these parameters summarizes distinct life-history features. The roles of biotic and abiotic factors on crayfish life history warrant further study.

Ecological correlates of fish reproductive activity in floodplain rivers: a life-history-based approach

2007 ◽  
Vol 64 (10) ◽  
pp. 1291-1301 ◽  
Author(s):  
Steven C Zeug ◽  
Kirk O Winemiller
Keyword(s):  
Life History ◽  
Abiotic Factors ◽  
Reproductive Activity ◽  
Life History Strategies ◽  
Theoretic Approach ◽  
Adult Size ◽  
Mean Flow ◽  
High Fecundity ◽  
Information Theoretic Approach ◽  
Floodplain Habitats

Reproductive activity of seven species representing three divergent life history strategies was monitored monthly for 2 years in channel and floodplain habitats of the Brazos River, Texas, USA, to evaluate associations between reproductive activity and biotic and abiotic factors predicted by conceptual models to influence reproduction. An information-theoretic approach was used to select best approximating models for each species, and model-averaged estimates of regression coefficients were calculated. Model selection indicated that monthly flow based on the 30-year hydrograph and temperature was strongly supported as factors associated with reproductive activity of all three life history strategies. The timing of reproduction in relation to the long-term hydrograph was related to life history traits. Reproductive activity of species with large adult size and high fecundity was greatest in spring just prior to increasing flows, whereas species with small adult size and extended breeding seasons exhibited greater activity in late spring and summer when mean flow was greatest. Nest-building species with parental care were more abundant in off-channel habitats where floods were less common. Instream flow management would benefit from consideration of flow and habitat requirements needed to support the diverse life history strategies displayed by fishes in river–floodplain systems.

The characteristics of lifespan in Cheyletidae and its response to environmental factors

Zoosymposia ◽  
2021 ◽  
Vol 20 ◽  
Author(s):  
ZEHUI ZHENG ◽  
BIN XIA
Keyword(s):  
Life History ◽  
Environmental Factors ◽  
Sex Difference ◽  
Growth And Development ◽  
Development Time ◽  
Abiotic Factors ◽  
Biotic And Abiotic Factors ◽  
The Family ◽  
Difference Temperature

This paper provides a survey of a collection of references on life history studies of eight species in the family Cheyletidae. It reviews some factors (including sex difference, temperature, humidity and prey) that affect the development time and lifespan in Cheyletidae. This paper also analyzes the effects these biotic and abiotic factors on the growth and development of cheyletid mites.

scholarly journals Empirical evidence of plasticity in life-history characteristics across climatic and fish density gradients

2017 ◽  
Vol 74 (4) ◽  
pp. 464-474 ◽  
Author(s):  
Hillary G.M. Ward ◽  
John R. Post ◽  
Nigel P. Lester ◽  
Paul J. Askey ◽  
Theresa Godin
Keyword(s):  
Life History ◽  
Empirical Evidence ◽  
Growth Rates ◽  
Life History Theory ◽  
Resource Competition ◽  
Somatic Growth ◽  
Life History Strategies ◽  
Fish Density ◽  
Density Gradients ◽  
Life History Characteristics

Understanding how environmental productivity and resource competition influence somatic growth rates and plasticity in life-history traits is a critical component of population ecology. However, evolutionary effects often confound the relationship between plasticity in life-history characteristics and environmental productivity. We used a unique set of experimentally stocked populations of rainbow trout (Oncorhynchus mykiss) to empirically test predictions from life-history theory relating to patterns in immature growth rates, age- and size-at-maturity, and the energy allocated into reproduction across climatic and fish density gradients. Our results support theoretical predictions that plasticity in life-history characteristics is a function of environmental variables. In particular, we demonstrate that immature growth rates are best explained by climatic and density-dependent competition effects and that age-at-maturity and the energy allocated to reproduction depends on juvenile growth conditions. Empirical evidence of these relationships helps to improve our understanding of optimal life-history strategies of fish populations.

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