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Population Dynamics
Click & Learn

Explore the exponential and the logistic growth mathematical models that describe how population changes with time.
Portrait of a Howler
Image of the Week

Groups of black howler monkeys (Alouatta caraya) “howl” to each other in the Amazon rainforest during the evening and early morning hours in order to maintain neighborly distances.
Benefits of Schools
Image of the Week

Being in a school affords young barracuda several advantages over the solitary life.
Developing an Explanation for Mouse Fur Color
Activity

Students collect and analyze evidence for each of the major conditions for evolution by natural selection to develop an explanation for how populations change over time.
Firefly Pyrotechnics
Image of the Week

Most firefly species employ characteristic patterns of bioluminescent flashes to elicit responses from potential mates.
Asteroid Impact?
Image of the Week

A living foraminifer, Orbulina universa, in the act of shortening its spines in preparation for gametogenesis.
Using Wolbachia to Suppress Mosquito Fertility
Data Point

In this study, researchers tested whether releasing Wolbachia-infected male Aedes albopictus (Asian tiger mosquitoes) would suppress populations of this mosquito species in their study area.
How Lizards Find Their Way Home
Scientists at Work

(8 min 33 sec) When Dr. Manuel Leal removed lizards from an area in the forest, he noticed an interesting phenomenon: all the lizards seemed to be back the next day. Watch as he sets up an experiment to study how these lizards navigate home. Also available in Spanish.
Dad Feathers
Image of the Week

The male peafowl, or peacock, invests a lot in his appearance.
Seed Dispersal and Habitat Fragmentation
Scientists at Work

(8 min 3 sec) Watch researchers follow brown spider monkeys in a tropical forest of Colombia to determine which plant seeds they are dispersing. Seed dispersers are critical to the forest’s ability to grow and regenerate.
Root Movement
Image of the Week

Root tips constantly search the soil for water and nutrients using the power of cell division and elongation.
WildCam Darién
Click & Learn

Researchers in Darién and Soberanía National Parks use remote trail cameras to study jaguars and their prey. You can contribute to this important research through WildCam Darién, an online citizen science platform.
Counting the Rings
Image of the Week

An otolith from a lanternfish (Gymnoscopelus nicholsi) is used to estimate the fish’s age and growth rate.
Sleep Clears β-amyloid from the Brain
Data Point

The researchers in this study tested whether the rate of Aβ removal is higher during sleep using mice as model organisms.
Dragon Tale
Image of the Week

A pangolin rescued from poachers near Gorongosa National Park, Mozambique.
Modeling Trophic Cascades
Activity

Students use cards of animal and plant species to model trophic cascades. Species examples are drawn from seven different habitats to test student understanding.
Single Mother
Image of the Week

A queen bee may produce as many as 60,000 offspring during her lifetime.
Trophic Cascades in Salt Marsh Ecosystems
Scientists at Work

(10 min 1 sec) Ecologist Brian Silliman uses manipulative field experiments to reveal that salt marsh ecosystems are under top down control from consumers and predators.
Larval Biscuit
Image of the Week

A pluteus larva of the sea biscuit, Clypeaster subdepressus, an echinoderm closely related to sea urchins.
Riverine Food Webs – How Flow Rates Affect Biomass
Scientists at Work

(9 min 15 sec) Ecologist Mary Power studies the Eel River in Northern California to figure out the connection between river flows and biodiversity.