Sometimes it takes time and keen observation to notice
changes within an environment, with the powers of observation when looking very
closely things that your expect to see might not be there and things that
should be there are not. As a species when humans interact with their
environment it is sometimes easy to miss the consequences of actions and
interactions. Our harbors, oceans and rivers not only are challenged by pollution
and the effects of pesticides and chemicals. But also a more significant threat
to native species is intentional or unintentional species that are introduced
from other parts of the world into an eco system that has no counterbalance
ability. The problem becomes when we introduce something that’s not native to
environment if there is no natural predator that will keep the population in
check or a specific series of weather conditions soil or climate that my
control the species we risk the possibility of wiping out native species. The similar
analogy would be when Europeans first arrived in the New World and brought
diseases that there was no immunity for that wiped out a significant portion of
the Native American population.
Part of the problem exists because consequences cannot be
foreseen. Having spent a significant portion of time on freshwater rivers and
lakes you become a very aware of changes within the environment and how things
change from year to year decade to decade and century to century. The invasive
species that I am most familiar with in freshwater is milfoil, that the
freshwater lakes and rivers there’s been a tremendous effort in the past several
years to educate, control and eradicate the spread of this non-native species there
was introduced into our eco system in New England. The reason that milfoil is
so deadly is that it grows rapidly depletes all the oxygen from the environment
and there are tremendous fish kills because it. Part of how this happens is by
organism and a plant hitchhiking rides on boats and ships and are carried to new
environments. Another example of an invasive species is Asian carp in the Great
Lakes the problem is becoming so prevalent that native species of fish that have
survived centuries are struggling to adapt to a new threat.
One of the things that we saw today that I wasn’t expecting
was invasive species, I had been aware of the green crab having been introduced
into the environment and how the nat. But was unaware of the extent of the
problem within the ocean and harbors, What I realized today is that what we saw
yesterday at the boat slip and today at the two different docs that we visited
with that things have changed their no invasive species inhabiting Boston
harbor the extent of the problem seems to be prevalent from the Marriott at long
wharf on the river walk and as far as the Barking Crab in South Boston. The
interesting part is that looking at the guidebook I thought I was seeing native
species and I realize now was that there was some native species that are
struggling to survive because of an invasive species. It wasn’t until I
consulted the MIT Sea Grant hitchhiker’s website that I realize the extent.
What we observed was close to the Club Tunicate, Green fleece algae, Red Alge, green
crabs, and the possible addition of Asian Isopod, northern rock barnacles,
Tunicate, Star Tunicate and “mystery” Tunicate.
While I was researching the blue mussel I came across a very
interesting article about how the Asian shore crab was introduced approximately
15 years ago and how the muscles had no defense. But in 2006 it was shown that mussels
have evolved in an effort to survive that somehow managed to thicken their
shells. This discovery was by Aaren Freeman and James Breyer at the University
of New Hampshire. This is good news the species can develop defenses, and
something that I did not anticipate.
In conclusion the concerns of the oyster farm, MIT, BU and
the pew trust are well grounded. In the Pew trust oceans commission article it
outlines how serious the problem is and how often invasive species are being
introduced into the environment. It may take a lawsuit before there are significant
changes in the ballast emptying procedures of all ships entering US waters. But
it may be a very necessary step in order to protect US fisheries and shellfish
farms. There needs to be significant changes in education and enforcement and
agricultural importation.
http://evolution.berkeley.edu/evolibrary/news/060901_mussels
http://www.pewtrusts.org/uploadedFiles/wwwpewtrustsorg/Reports/Protecting_ocean_life/env_oceans_species.pdf
http://massbay.mit.edu/publications/hitchhikers/Hitchhikers2.pdf
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