Fishing for Answers at Larson Woodland

Staff and volunteers from the Woonasquatucket River Watershed Council in Rhode Island paid a visit to the Attleboro Land Trust’s Larson Woodland on September 17 to take a census of fish species in the Ten Mile River.  They came at the invitation of Keith Gonsalves of the Ten Mile River Watershed Council.  Keith has long been concerned about the health of the river and its inhabitants and has been arranging these scientific surveys annually for a number of years to monitor the river’s condition.

Volunteers helped collect the fish, using a device which temporarily stuns the fish with a slight electric shock.  The fish are counted and measured, then returned unharmed to the river.

 

In this video clip, ranger Jacob Gorke measures a baby largemouth bass.

 

This is a Yellow Bullhead Catfish.

 

Other species found in the river were Golden shiner, Tesselated darter, Pumpkin seed, Bluegill, Redfin pickerel, Crawfish, and Chain pickerel.

Thoreau’s Journals Provide a Wealth of Data for Climate Scientists

Spring is coming earlier than it did in the  nineteenth century, a scientific study has found.  One of the indicators of spring is the blossoming of trees and flowers.  Author, naturalist, and philosopher Henry David Thoreau was deeply interested in the unfolding of the seasons.  On his daily walks in Concord,  Massachusetts, he took notes whenever he observed such seasonal changes.  He wrote in his journal “I often visited a particular plant four or five miles distant, half a dozen times within a fortnight [2 weeks], that I might  know exactly when it opened.”  An entry on May 5, 1855, notes “High blueberry beg[in] to leaf in some places yesterday.”

Highbush blueberry in bloom at the Colman Reservation    Image credit: C Adler

Biologist Richard Primack has mined Thoreau’s journals for these observations and compared them with current data.  In 2010, for example, highbush blueberry first flowered in Concord on April 7.  Comparing 32 plants from Thoreau’s time to today, Primack found the first flowering dates were now occurring an average of 11 days earlier.  According to a United Nations panel, human activity has caused average global temperatures to increase 1.0 degrees Celsius above pre-industrial levels.  In Concord, a suburb of Boston, the increase has been at least 2.0 degrees Celsius because of the “heat island” effect of dense development, pavement, and energy use compared to rural areas.  Plants are responding to this warming by blooming earlier.

A page from Thoreau’s Journal, May 5, 1855

 

Birds that migrate long distances, such as this Great Crested Flycatcher, have not adjusted their schedules to stay in sync with the earlier arrival of spring in Massachusetts.    Image credit: C Adler

In recent studies, Primack has found evidence that insect populations shift their schedules in sync with the plants they feed on, which is not surprising.  However, the arrival of birds who winter in the tropics has not, on average, shown much of a shift.  As a result, one of the consequences of climate change may be a mismatch between bird populations and the availability of the insects they feed on.  In 1852, Thoreau voiced a similar awareness of the importance of climate in the circle of life, noting that an unusually long winter could have deadly consequences for returning birds.  But he did not foresee the steady retreat of winter that we now face.

Annual Survey Monitors the Health of the Ten Mile River and Its Inhabitants

On September 22, volunteers from the Ten Mile River Watershed Council assisted ranger Jacob Gorke of the Woonasquatucket River Watershed Council of Rhode Island in conducting a survey of fish species in the Ten Mile River at Larson Woodland.

The fish are stunned temporarily with an electric shock, netted and removed to be identified, then released back to the river.  The survey is conducted annually.

Fish survey volunteers receiving their instructions.    Image credit: Keith Gonsalves

This is just one of many activities conducted year round by the Ten Mile River Watershed Council to promote and protect the river.  For more information, contact Keith Gonsalves Keith@tenmileriver.net.