Results 21 to 30 of about 5,889,365 (284)

Green‐brown polymorphism in alpine grasshoppers affects body temperature

open access: yesEcology and Evolution, 2020
Ectothermic animals depend on external heat sources for pursuing their daily activities. However, reaching sufficiently high temperature can be limiting at high altitudes, where nights are cold and seasons short.
Günter Köhler, Holger Schielzeth
doaj   +1 more source

Partial differential equations in ecology: spatial interactions and population dynamics [PDF]

open access: yes, 1994
Most of the fundamental elements of ecology, ranging from individual behavior to species abundance, diversity, and population dynamics, exhibit spatial variation.
Holmes, E. E.   +3 more
core   +1 more source

Demography of Attalea nucifera: sustainable management and conservation of a threatened species of Colombia

open access: yesCaldasia, 2020
Attalea nucifera is an acaulescent palm native of Colombia that is in risk of extinction. Between 2016-2017 we evaluated the structure and density of populations in six localities of the Magdalena river val-ley, and studied the population dynamic in the ...
Jorge Prada-Ríos , Néstor García
doaj   +1 more source

Friend or foe? A parasitic wasp shifts the cost/benefit ratio in a nursery pollination system impacting plant fitness

open access: yesEcology and Evolution, 2020
Nursery pollination systems are species interactions where pollinators also act as fruit/seed herbivores of the plant partner. While the plants depend on associated insects for pollination, the insects depend on the plants’ reproductive structures for ...
Carmen Villacañas de Castro   +1 more
doaj   +1 more source

A Framework for Determining Population-Level Vulnerability to Climate: Evidence for Growth Hysteresis in Chamaecyparis thyoides Along Its Contiguous Latitudinal Distribution

open access: yesFrontiers in Forests and Global Change, 2020
The impact of ecological and climatological factors on individual organisms over time and space is inherently complex and creates substantial uncertainty about how climate change will influence the global biosphere. To understand some of this complexity,
Neil Pederson   +9 more
doaj   +1 more source

Interpopulation variation in seed traits of five Polygonaceae

open access: yesFrontiers in Ecology and Evolution, 2023
Interpopulation variability in seed traits may drive the regeneration capacity of a species to colonize different environments. In the present study, we evaluated the variation in seed physical traits (mass / size, water imbibition, shape index) and ...
Arvind Bhatt   +3 more
doaj   +1 more source

Population response to environmental productivity throughout the annual cycle in a migratory songbird

open access: yes, 2015
Environmental factors affect migratory animal populations in every phase of their annual cycle and have significant impacts on breeding success and survival.

core   +1 more source

Amblyomma tapirellum  (Acari: Ixodidae) collected from tropical forest canopy [v2; ref status: indexed, http://f1000r.es/2uy]

open access: yesF1000Research, 2014
Free-ranging ticks are widely known to be restricted to the ground level of vegetation. Here, we document the capture of the tick species Amblyomma tapirellum in light traps placed in the forest canopy of Barro Colorado Island, central Panama. A total of
Jose R Loaiza   +13 more
doaj   +1 more source

Density-dependent immigration promotes population stability in a long-distance migratory bird

open access: yes, 2017
The spatial structure of populations determines the relative importance of reproduction, survival and movement on population dynamics. However, the mechanisms by which local individuals and immigrants interact and the subsequent effects of immigrants on ...

core   +1 more source

Observations on spiny dogfish (Squalus acanthias) captured in late spring in a North Carolina estuary [v2; ref status: indexed, http://f1000r.es/4dj]

open access: yesF1000Research, 2014
Five spiny dogfish were captured in early-mid May during gillnet and longline sampling targeting juvenile coastal sharks in inshore North Carolina waters.  Dogfish captures were made within Back Sound and Core Sound, North Carolina.
Charles Bangley, Roger Rulifson
doaj   +1 more source

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