منابع مشابه
Demographic and employment shifts: implications for benefits and economic security.
This Issue Brief examines factors affecting the population's age distribution and composition, such as mortality rates, fertility rates, and immigration. In addition, it examines factors affecting labor force composition, such as immigration, increased labor force participation of women, and retirement trends, and discusses the potential impact of these changes on publicly financed programs: Me...
متن کاملPredator-Induced Demographic Shifts in Coral Reef Fish Assemblages
In recent years, it has become apparent that human impacts have altered community structure in coastal and marine ecosystems worldwide. Of these, fishing is one of the most pervasive, and a growing body of work suggests that fishing can have strong effects on the ecology of target species, especially top predators. However, the effects of removing top predators on lower trophic groups of prey f...
متن کاملCompetitive and demographic leverage points of community shifts under climate warming.
Accelerating rates of climate change and a paucity of whole-community studies of climate impacts limit our ability to forecast shifts in ecosystem structure and dynamics, particularly because climate change can lead to idiosyncratic responses via both demographic effects and altered species interactions. We used a multispecies model to predict which processes and species' responses are likely t...
متن کاملThe demographic impacts of shifts in climate means and extremes on alpine butterflies
1. Climate change impacts organismal performance via both shifts in mean conditions and acute thermal stress events. Yet, we know little about the relative fitness impacts of climate means and extremes, and how phenotypes mediate these effects. 2. Here, we incorporate demography in a biophysical model of two alpine butterflies with distinct phenotypes to examine the impacts of recent climate ch...
متن کاملCOUNTEREXAMPLES IN CHAOTIC GENERALIZED SHIFTS
In the following text for arbitrary $X$ with at least two elements, nonempty countable set $Gamma$ we make a comparative study on the collection of generalized shift dynamical systems like $(X^Gamma,sigma_varphi)$ where $varphi:GammatoGamma$ is an arbitrary self-map. We pay attention to sub-systems and combinations of generalized shifts with counterexamples regarding Devaney, exact Dev...
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ژورنال
عنوان ژورنال: Nature
سال: 2001
ISSN: 0028-0836,1476-4687
DOI: 10.1038/35106728