Forest Birds of Connecticut and Rhode Island, the eight-year long summer and winter study of the population densities, distributions and habitat use by the forest birds of southern New England, is now available for free download.
We invite readers to become sponsors for individual species. You may do so by writing us your species choice at email@example.com. Upon receipt of your choice (please make a first, second and third choice in your message), your name will be added to the species account as a sponsor. Names of species sponsors will be updated daily on the downloadable book so that you may see which species have already been chosen. You will also receive a printed copy of the book as our gift upon completion of the species sponsor campaign. We request a donation of $125 to become a sponsor, and you may make your donation here.
The wet, high elevation limestone forests of Rota in the tropical Pacific are characterized by epiphytic ferns, fern allies and orchids.
The topic of species diversity is focused upon in this next
episode of a video series designed to complement the AP Environmental Science
curriculum. It begins with an exploration
of the scale at which diversity is considered, discussing the concepts of
alpha, beta and gamma diversity. It also
considers the components of diversity- species richness and species evenness.
The video then goes on to examine methods of
computing diversity. It evaluates
the uses and pitfalls of diversity characterization, including the loss of
information that occurs by computing diversity indicies.
Still another diversity-related issue is the edge
effect. The video examines how diversity
responds to the boundary between habitats and how certain species are edge
specialists. It also notes, however, that
edges can have reduced habitat quality as well as higher rates of predator activity.
The video concludes by examining the species-area
effect. It considers the phenomenon of
minimum habitat size and the role of chance in the accumulation of species by
virtue of area.
Food webs are extensions of the concept of trophic levels-
the compartmentalized view of how energy flows through ecoystems from primary
producers to primary, secondary and tertiary consumers. The food web concept clarifies that
individual species can influence energy flow in more than one of these trophic
levels. These and related topics are the
subject of the next video in a lecture series related to the AP Environmental
Science national curriculum. The video
also reviews the concept of trophic efficiency- the percent of energy that is
passed from one trophic level to the next, and compares the productivity of a
variety of ecosystems on planet Earth.
The focus of the video then shifts to that of biological
diversity. It compares a system with few
species in which some reach great abundance with a system housing many species
in which no one assumes dominance. It
also examines the components of diversity- richness and evenness. The video concludes by considering the
patterns of diversity that may be viewed at large geographic scales. This and other videos in this series are
produced by the publishing partner of Bird Conservation Research, Inc.-Arts and Academic Publishing.