Zane
Gray Creek, better known as an offshore mangrove island and channel, is located
slightly off Long Key, ocean side. Along with an abundance of mangroves, there
was an amazing amount of biodiversity throughout. Starting from the bottom of
the food chain, we found numerous amounts of algae and seagrass. To name just a
couple, we spotted Caulerpa sp., a feathery-like strand of invasive green
alga, and Udotea sp., a more fan-like
alga that moves with water current. Moving on to seagrasses, two species were
identified. Thalassia was seen in
abundance around the mangrove island and was clearly a dominant species on the
sea floor. Mixed throughout, there was a good amount of Halodule sp., or shoal
grass. Moving forward, there was a small amount of hard coral and sponges lined
throughout the sea floor and in the mangrove roots. What really caught our eye
however, was the vast amount of fish and invertebrates. A range from juvenile
mangrove snapper all the way to about a 5 foot nurse shark. From Casiopea, or upside down jellyfish, to
parrot fish and scrawled cowfish. Even the smaller organisms were spotted, such
as hydroids, tunicates, and spaghetti worms. A majority of the wild life here
was seen to be either juvenile or in intermediate stages. This may be caused by
the protection and nursery-like structure formed from the intricate tangling of
the mangrove roots. Overall, it was an interesting place to snorkel due the
vast amounts of not only animal life, but also plant life.
When we
snorkeled Zane Gray, it was our 5th site and was conducted on May 17th.
It was later afternoon, around 3:30-4:00 p.m., and partly cloudy overhead. The
water depths ranged from roughly 2 feet deep down to about 10 feet in depth
around the mangrove island. We were very fortunate in the fact that our water
visibility was very clear and that we could see roughly 20 feet ahead into the
water. It was also nice that the water was calm and there was almost no wave
action or turbulence to cause turbidity.
There
was another mangrove island that we visited on the Florida Bay side, called
Koch Key. There were a few differences and similarities between the ocean and
bay locations. To start with the differences, we noticed different water
qualities. The ocean side had better water clarity and greater depth. Where
Koch Key stayed very shallow, Zane Gray dropped down to roughly 10 feet.
Another difference was the amount of biodiversity and size of it. The bay side
presented a small variety of very young fish and up and coming juveniles. The
ocean side presented mostly juveniles and growing fish, along with a great
variety of mangrove fish, including a nurse shark. Moving forward, there were a
couple of similarities as well. To start, the two islands were composed of
mostly the same type of mangroves, that being red. Also, there was a similar
showing of seagrasses, Thalassia
being the most abundant. Finally, it was seen in both sites that the fish like
to stay near or within the mangrove roots for either protection or feeding. If
we had to decide between a site to visit again, it would be Zane Gray Creek due
to its depth variance and the great amount of biodiversity.
Photo credit: Corey Corrick
By Ryan Lusardi and Gage Wilson
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