Posts Tagged ‘wellfleet’

Menhaden Seek Safe Harbor in Wellfleet; Still Absent in Sippican Harbor

Monday, September 29th, 2008

Atlantic menhaden, known locally as pogies, alwifes, and bunker, often school in estuaries during September and October, swimming in very large balls as herd protection from ferocious bluefish attacks.  As Hurricane Kyle blew by Cape Cod on Sunday, topping off a long three day weekend of pouring rain, a menhaden school flooded into the inner harbor of Wellfleet at high tide, followed by blues that were followed by local fishermen.  The word must have spread by ethernet (among bluefish and humans) because soon fishing poles outnumbered pogies.

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Menhaden Flood into Wellfleet Inner Harbor

Over the last few years, locals have perceived a significant decline in menhaden.  They have petitioned state and federal legislators for action to control the reduction fishery in which menhaden are harvested for the extraction of omega-3 oils for human consumption with the remainder used for aquaculture and livestock feed.  Menhaden are also harvested as bait for both commercial and recreational fisheries.  Whatever the cause of perceived overfishing, menhaden form a critical link in the coastal ecosystem and their absence would have a significant effect in degrading the coastal enviroment.

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Large Concentration of Menhaden in Sippican Harbor (2006)

In Sippican Harbor off Buzzards Bay, we have been awaiting the arrival of pogies this year.  We found no significant concentration of menhaden in the fall of 2007.  The last time we documented a major massing of menhaden schools in Marion’s Sippican Harbor was September and October 2006.  We are waiting to see if they return in any substantial numbers in 2008.

Sippican Menhaden Beset with Parasitic Copepods

As you can detect in the close-up shots from the video clip, a large percentage of 2006 menhaden were adorned with parasitic copepods.

Don Lewis Holds Menhaden Netted in Chipman’s Cove

During early October 2005 we documented many large schools of menhaden in Wellfleet’s Chipman’s Cove, south of the harbor pier.

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Menhaden Massing in Chipman’s Cove (2005)

For Some Hatchling, Nursery Lies in the Uplands

Thursday, September 11th, 2008
 
One surprise we discovered over the last few years is that diamondback terrapin hatchlings employ a variety of strategies to survive their most vulnerable first year.  We had all expected that like sea turtles, terrapin hatchlings scramble from their nests in a beeline for the safety of the thick, rich, robust nursery salt marsh habitat ringing Wellfleet’s most productive nesting sites.  The first indications that we may have been hasty in this assumption were hatchlings we found in May and June each year heading DOWN HILL from the uplands toward the salt marsh.  The first few observations were dismissed as late emerging hatchlings that had overwintered in their natal nests since we had documented a few nests in May and June that had hatched in the fall, but where some hatchlings had remained until the next spring.  However, once we spotted yearlings heading down slope from the uplands to the marsh this rationalization collapsed.
 
Dr. Barbara Brennessel of Wheaton College conducted experiments tracking headstarted hatchlings released in their natal habitat in the Wellfleet Bay system.  They were equipped with a transmitter for RDF (radio direction finding) tracking.  Although much larger than a normal hatchling due to overwinter feeding, a number of these turtles headed into the salt marsh, behaving precisely as we would have expected a baby terrapin to act.  They hid out in the thick Spartina patens, feeding on whatever small critters they could discover in this rich marsh system.  However, some number of these headstarts went upland into the vegetated banks abutting sandy nesting areas and the salt marsh.  Since these animals were not “pristine” hatchlings, we asterisked their “aberrant behavior.”
 
But once we began to track baby hatchlings emerging from natural nests on treks upland, we realized that putting all the data together, many hatchlings race into the robust Spartina patens of the Wellfleet salt marsh system, lots of hatchlings dash under the rimming wrack line between sandy nesting banks and the salt marsh, and still others scale the banks and dunes to explore the vegetative uplands above the most productive nesting sites.  These terrapins employ a richer, more complex strategy that offers multiple opportunities for survival of hatchlings in a very raw and unpredictable climate at the northernmost edge of their range.
 
This week we watched the emergence of a nest at Turtle Point.  Ten live hatchlings left the nest and we followed them with a long-distance telephoto lens to determine how this group might behave once they had tunneled out of the nest.  You may recall earlier reporting of tracking hatchlings into the wrack line and others into the Spartina patens (see Tracking Terrapin Hatchlings, http://www.turtlejournal.com/?p=225)
 
The first hatchling set out on a solo trek and headed immediately into the vegetation above the nesting bank.
 
 
Solo Hatchlings Climbs into Upland Vegetation
 
Three others seemed to wait for this scout to complete its scramble, and then they too scaled the bank to disappear into upland vegetation. 

Three More Hatchlings Scramble Upslope

The last batch of six hatchlings followed suit, with the final two in this pair offering quite a tag team performance.
 
 
Final Six Head Upland, Too
 
Finally, once they had fully dispersed into the uplands, we attempted to find them again.  Truth be told, even though we had followed their movements in detail with a long distance telephoto lens, we could only locate four of the ten hatchlings because they were so well camouflaged within the groundcover vegetation.
 
 
Hatchlings Camouflaged in Upland Bearberry Vegetation
 

Big year for baby diamondbacks on Cape Cod

Saturday, August 23rd, 2008
 
Photo courtesy Sue Wieber Nourse, Cape Cod Consultants

Photo courtesy Sue Wieber Nourse, Cape Cod Consultants

Wellfleet tot Delilah Beebe gets to hold a diamondback hatchling.

http://www.patriotledger.com/news/state_news/x499365910/Big-year-for-baby-diamondbacks-on-Cape-Cod