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Tracing the evolutionary origins of fish to shallow ocean waters
Colorful red and turquoise fish with round mouth opening swims in the ocean

Phlebolepis, a streamlined jawless fish with tiny scales that lived 425 million years ago, swims in deeper subtidal waters near a reef. (Image: Nobumichi Tamura)

Tracing the evolutionary origins of fish to shallow ocean waters

Coral reefs are envisioned as the seats of great biodiversity, but they may not be where all that diversity got its start. In a new study in Science, paleobiologist Lauren Sallan and colleagues reveal that the earliest fish may have diversified in shallower waters near shore.

Katherine Unger Baillie

Growing a ‘culture of cultivation’ on campus
Penn Park Orchard

The Penn Park Orchard, located at the southeastern edge of campus, is home to fruit trees, herbs, perennial flowers, and more. Planting events set for this fall will expand the orchard's boundaries. (Photo: Cole Jadrosich/FRES)

Growing a ‘culture of cultivation’ on campus

Even on an urban campus, there are numerous places to coax food from the soil. From the Penn Student Garden on Spruce Street to the Penn Park Orchard, Facilities and Real Estate Services staff are expanding opportunities for the community to interact with an edible landscape.

Katherine Unger Baillie

The changing landscape of mosquito- and tick-borne diseases
James Lok, Penn Vet

Parasitology professor James Lok’s studies of the development and basic biology of parasites, particularly the roundworm Strongyloides, have implications for finding new drug candidates. Veterinary schools have traditionally been strongholds of parasitology research, and Penn Vet is no exception. (Image: Eric Sucar)

The changing landscape of mosquito- and tick-borne diseases

Lyme disease, West Nile virus, Zika, chikungunya, and dengue are among the vector-borne infections making headlines. Penn researchers shed light on what’s behind the spread and how to stay safe.

Katherine Unger Baillie

Frigid polar oceans, not coral reefs, are hot spots for formations of fish species
Sallan.parrot fish

The bicolor parrotfish is a member of a group of fish that dwells in the tropics, which a new study found to be, counterintuitively, slower-evolving than fish in colder ocean waters. (Image: Richard Ling/Wikipedia)

Frigid polar oceans, not coral reefs, are hot spots for formations of fish species

Tropical waters contain a dazzling diversity of fish species compared to colder ocean areas. Yet a new study paradoxically indicates that the colder waters are home to the highest species formation rates.

Katherine Unger Baillie

Penn Researchers Look to Cuba for Sustainability and Agroecology in Practice

    • Penn Researchers Look to Cuba for Sustainability and Agroecology in Practice

    On many farms in the Cuban countryside, yellow flowers bookend certain crops, placed in such a way to concentrate insects there rather than on the produce growing in the rows between. Equipment-toting oxen and tractors are equally common sights, and combined with a self-sustaining water system, minimize the need to transport fuel across great distances.