scholarly journals Temporal instability of lake charr phenotypes: synchronicity of growth rates and morphology linked to environmental variables?

2020 ◽  
Author(s):  
L. Chavarie ◽  
Steve Voelker ◽  
M.J. Hansen ◽  
C.R. Bronte ◽  
A.M. Muir ◽  
...  
Keyword(s):  
Growth Rates ◽  
Environmental Variables ◽  
Temporal Instability ◽  
Lake Charr

Population structure, age and growth rates of conifer species and their relation to environmental variables at Malam Jabba, Swat District, Pakistan

2018 ◽  
Vol 31 (2) ◽  
pp. 429-441
Author(s):  
Arsalan ◽  
Muhammad Faheem Siddiqui ◽  
Moinuddin Ahmed ◽  
Syed Shahid Shaukat ◽  
Alamdar Hussain
Keyword(s):  
Population Structure ◽  
Growth Rates ◽  
Environmental Variables ◽  
Age And Growth ◽  
Conifer Species

Growth and age at maturity of North American tortoises in relation to regional climates

1994 ◽  
Vol 72 (5) ◽  
pp. 918-931 ◽  
Author(s):  
David J. Germano
Keyword(s):  
North American ◽  
Growth Rates ◽  
Environmental Variables ◽  
Mean Annual Precipitation ◽  
Gopherus Agassizii ◽  
Age At Maturity ◽  
Main Determinant ◽  
Gopherus Polyphemus ◽  
Regional Climates ◽  
Richards Growth Model

North American tortoises (Gopherus spp.) are long-lived species that occur in a variety of habitats. I described growth of tortoises using Richards' growth model based on measures of scute annuli. Gopherus flavomarginatus is the largest species and grows the fastest, and Gopherus berlandieri is the smallest species with the slowest growth rates. Gopherus polyphemus and Gopherus agassizii are intermediate in size, with intermediate growth rates. All species grow relatively fast for 18–22 years, after which time growth rates decrease greatly. Estimates of mean age at maturity are 13.3 years for G. berlandieri, 13.9 years for G. flavomarginatus, 14.4 years for G. polyphemus, 13.8 years for Sinaloan G. agassizii, 14.4 years for western Mojave G. agassizii, 15.4 years for eastern Mojave G. agassizii, and 15.7 years for Sonoran G. agassizii. Several measures of growth did not correlate with precipitation among species of Gopherus, although mean yearly growth was negatively correlated with mean annual precipitation in populations of G. agassizii. Also, a matrix of growth variables did not correlate with a matrix of environmental variables. Although other environmental variables should be measured within the ranges of Gopherus spp., preliminary analyses suggest that the environment is not the main determinant of growth rates of North American tortoises.

Factors affecting the growth and condition of lake whitefish (Coregonus clupeaformis)

2009 ◽  
Vol 66 (12) ◽  
pp. 2096-2108 ◽  
Author(s):  
Michael D. Rennie ◽  
W. Gary Sprules ◽  
Timothy B. Johnson
Keyword(s):  
Growth Rates ◽  
Environmental Variables ◽  
Comprehensive Evaluation ◽  
Early Growth ◽  
Coregonus Clupeaformis ◽  
Lake Whitefish ◽  
Catch Per Unit Effort ◽  
Factors Affecting ◽  
Biological Variables ◽  
Alternative Hypotheses

Though declines in the growth and condition of Great Lakes lake whitefish ( Coregonus clupeaformis ) have been largely attributed to food web disruptions caused by invasive dreissenid mussels, a comprehensive evaluation of alternative hypotheses is currently lacking. Using various statistical approaches, we evaluated 69 years of data from the inner basin of South Bay, Lake Huron, considering the role of biological variables (food availability as Diporeia abundance and lake whitefish relative abundance as catch per unit effort, CPUE) versus environmental variables (climate change as growing degree days >5 °C and productive habitat capacity as percent epilimnetic volume, EV) on the condition and early growth rates of resident lake whitefish. Consistently, biological variables (Diporeia abundance, CPUE) best explained changes in lake whitefish growth and condition, respectively, in years when Diporeia data were available. In their absence, environmental variables (EV) best explained early growth rates of lake whitefish, whereas CPUE again best explained lake whitefish condition. Our analysis revealed that environmental change contributed significantly but alone was not sufficient to explain declines in lake whitefish growth after dreissenid establishment, whereas biological variables considered here could account for the majority of growth and condition changes observed in this population.

scholarly journals Temporal instability of lake charr phenotypes: synchronicity of growth rates and morphology linked to environmental variables?

2020 ◽  
Author(s):  
L. Chavarie ◽  
Steve Voelker ◽  
M.J. Hansen ◽  
C.R. Bronte ◽  
A.M. Muir ◽  
...  
Keyword(s):  
Growth Rates ◽  
Phenotypic Variation ◽  
Early Stage ◽  
Morphological Diversity ◽  
Annual Growth ◽  
Intraspecific Diversity ◽  
Phenotypic Change ◽  
Growth Increments ◽  
Phenotypic Shift ◽  
Lake Charr

AbstractPathways through which phenotypic variation arises among individuals arise can be complex. One assumption often made in relation to intraspecific diversity is that the stability or predictability of the environment will interact with expression of the underlying phenotypic variation. To address biological complexity below the species level, we investigated variability across years in morphology and annual growth increments between and within two sympatric lake charr ecotypes in Rush Lake, USA. We found a rapid phenotypic shift in body and head shape within a decade. The magnitude and direction of the observed phenotypic change was consistent in both ecotypes, which suggests similar pathways caused the temporal variation over time. Over the same time period, annual growth increments declined for both lake charr ecotypes and corresponded with a consistent phenotypic shift of each ecotype. Despite ecotype-specific annual growth changes in response to winter conditions, the observed annual growth shift for both ecotypes was linked, to some degree, with variation in the environment. Particularly, a declining trend in regional cloud cover was associated with an increase of early stage (age 1-3) annual growth for lake charr of Rush Lake. Underlying mechanisms causing reduced growth rates and constrained morphological modulation are not fully understood. An improved knowledge of the biology hidden within the expression of phenotypic variation promises to clarify our understanding of temporal morphological diversity and instability.

Reduced growth rates of hair in mice following radiation

1966 ◽  
Vol 94 (4) ◽  
pp. 491-498 ◽  
Author(s):  
F. D. Malkinson
Keyword(s):  
Growth Rates

Institutional Theory of Endless Redistribution

2005 ◽  
pp. 4-18 ◽  
Author(s):  
K. Sonin
Keyword(s):  
Property Rights ◽  
Institutional Theory ◽  
Growth Rates ◽  
Rent Seeking ◽  
Economic Institutions ◽  
Wide Spread ◽  
Grass Roots ◽  
Protection Systems ◽  
Private Protection ◽  
The Rich

In unequal societies, the rich may benefit from shaping economic institutions in their favor. This paper analyzes the dynamics of institutional subversion by focusing on public protection of property rights. If this institution functions imperfectly, agents have incentives to invest in private protection of property rights. The ability to maintain private protection systems makes the rich natural opponents of public protection of property rights and precludes grass-roots demand to drive the development of the market-friendly institution. The economy becomes stuck in a bad equilibrium with low growth rates, high inequality of income, and wide-spread rent-seeking. The Russian oligarchs of the 1990s, who controlled large stakes of newly privatized property, provide motivation for this paper.

Waiting for a New Model of Growth: Russia’s Social and Economic Development in 2013

2014 ◽  
pp. 4-32 ◽  
Author(s):  
V. Mau
Keyword(s):  
Economic Policy ◽  
Economic Development ◽  
Economic Performance ◽  
Growth Rates ◽  
Global Crisis ◽  
New Model ◽  
Social And Economic Development ◽  
Economic Risks

The paper deals with Russian social and economic development in 2013 and prospects for the next year or two. The author discusses the logic and trends of the global crisis started in 2008. This is the basis for further analysis of current Russian economic performance with special emphasis on the problem of growth rates deceleration. Special attention is paid to economic risks and priorities of economic policy.

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