scholarly journals Managing American Oystercatcher(Haematopus palliatus)Population Growth by Targeting Nesting Season Vital Rates

Waterbirds ◽  
2017 ◽  
Vol 40 (sp1) ◽  
pp. 44-54 ◽  
Author(s):  
Shilo K. Felton ◽  
Nathan J. Hostetter ◽  
Kenneth H. Pollock ◽  
Theodore R. Simons
Keyword(s):  
Population Growth ◽  
Vital Rates ◽  
American Oystercatcher ◽  
Haematopus Palliatus ◽  
Nesting Season

Breeding biology of the American Oystercatcher Haematopus palliatus on a key site for conservation in southern Brazil

2021 ◽  
Vol 29 (1) ◽  
pp. 16-21
Author(s):  
Bruno de Andrade Linhares ◽  
Juçara Bordin ◽  
Guilherme Tavares Nunes ◽  
Paulo Henrique Ott
Keyword(s):  
Breeding Biology ◽  
Southern Brazil ◽  
American Oystercatcher ◽  
Haematopus Palliatus

scholarly journals Beyond demographic buffering: Context dependence in demographic strategies across animals

2021 ◽  
Author(s):  
Omar Lenzi ◽  
Arpat Ozgul ◽  
Roberto Salguero-Gomez ◽  
Maria Paniw
Keyword(s):  
Growth Rate ◽  
Population Growth ◽  
Temporal Variation ◽  
Population Growth Rate ◽  
Natural Populations ◽  
Environmental Context ◽  
Context Dependence ◽  
Vital Rate ◽  
Rate Variation ◽  
Vital Rates

Temporal variation in vital rates (e.g., survival, reproduction) can decrease the long-term mean performance of a population. Species are therefore expected to evolve demographic strategies that counteract the negative effects of vital rate variation on the population growth rate. One key strategy, demographic buffering, is reflected in a low temporal variation in vital rates critical to population dynamics. However, comparative studies in plants have found little evidence for demographic buffering, and little is known about the prevalence of buffering in animal populations. Here, we used vital rate estimates from 31 natural populations of 29 animal species to assess the prevalence of demographic buffering. We modeled the degree of demographic buffering using a standard measure of correlation between the standard deviation of vital rates and the sensitivity of the population growth rate to changes in such vital rates across populations. We also accounted for the effects of life-history traits, i.e., age at first reproduction and spread of reproduction across the life cycle, on these correlation measures. We found no strong or consistent evidence of demographic buffering across the study populations. Instead, key vital rates could vary substantially depending on the specific environmental context populations experience. We suggest that it is time to look beyond concepts of demographic buffering when studying natural populations towards a stronger focus on the environmental context-dependence of vital-rate variation.

Characterization of elasticity patterns of North American freshwater fishes

2006 ◽  
Vol 63 (9) ◽  
pp. 2050-2066 ◽  
Author(s):  
Luis A Vélez-Espino ◽  
Michael G Fox ◽  
Robert L McLaughlin
Keyword(s):  
Population Growth ◽  
North American ◽  
Growth Rates ◽  
Freshwater Fishes ◽  
Adult Survival ◽  
Juvenile Survival ◽  
Vital Rates ◽  
Population Growth Rates ◽  
North American Freshwater ◽  
Trade Offs

We applied elasticity analysis to 88 North American freshwater fishes to assess the relative impacts of changes in the vital rates on asymptotic population growth. Variance in vital rates was summarized for four distinct functional groups: (i) species with population growth rates strongly sensitive to perturbations in adult survival; (ii) species with population growth rates sensitive to perturbations in overall survival; (iii) species with population growth rates most sensitive to perturbations in juvenile survival; and (iv) species with population growth rates sensitive to perturbations in juvenile survival and fecundity. The results of the present study also showed that (a) elasticity patterns cannot be inferred in a straightforward manner from trade-offs between life-history traits, (b) the sensitivity of a population's growth rate to changes in adult survival and fecundity can be predicted empirically from life span and age at maturity, respectively, (c) elasticities are highly conserved among genera within the same taxonomic family, and (d) there are key divergences between elasticity patterns of freshwater fish and other vertebrate taxa.

scholarly journals Translating Effects of Inbreeding Depression on Component Vital Rates to Overall Population Growth in Endangered Bighorn Sheep

2011 ◽  
Vol 25 (6) ◽  
pp. 1240-1249 ◽  
Author(s):  
HEATHER E. JOHNSON ◽  
L. SCOTT MILLS ◽  
JOHN D. WEHAUSEN ◽  
THOMAS R. STEPHENSON ◽  
GORDON LUIKART
Keyword(s):  
Population Growth ◽  
Inbreeding Depression ◽  
Bighorn Sheep ◽  
Vital Rates

scholarly journals Repeated count surveys help standardize multi-agency estimates of American Oystercatcher (Haematopus palliatus) abundance

The Condor ◽  
2015 ◽  
Vol 117 (3) ◽  
pp. 354-363 ◽  
Author(s):  
Nathan J. Hostetter ◽  
Beth Gardner ◽  
Sara H. Schweitzer ◽  
Ruth Boettcher ◽  
Alexandra L. Wilke ◽  
...  
Keyword(s):  
American Oystercatcher ◽  
Haematopus Palliatus ◽  
Count Surveys
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