Monitoring at MacMillan Wharf, Provincetown, MA

Monitoring at MacMillan Wharf, Provincetown, MA
Marine Invasive Species (MIS) Monitoring at MacMillan Wharf, Provincetown, MA.

Sunday, May 20, 2018

Floating Dock Videos

Bugula, Grateloupia, and Bryopsis:
Capturing Moving Targets with Greater Clarity 

During the summer of 2016, I tried my hand at making videos of species on the docks that are moving in time with the wave action.  The live observation of some species just didn't seem to be realistically captured by a static image.  I was surprised at the detail that was shown by a video in comparison to a photo, especially on a day when the water was choppy.  Two of these videos featuring the invasive bryozoan Bugula neritina, the invasive Asian red alga Grateloupia turuturu, and the native green alga Bryopsis plumosa are shown below.  Bugula, which occurs at relatively high frequency on the docks, and Grateloupia, which is seen at low frequency, have been consistent parts of the floating dock community since I started monitoring Provincetown.  

Bryozoa and Algae at the Waterline
Floating dock species growing along the waterline.  The purple bryozoan Bugula neritina (center) is flanked by the bryopsid green alga Bryopsis plumosa (left) and the red alga Grateloupia turuturu (right).  A single solitary ascidian Styela clava with open siphons is seen in the center background.  MacMillan Pier, 2016. 

Asian Red Alga Waving with the Water Action
Another group of the same species focusing on the movement of the Asian red alga Grateloupia turuturu. The soft, leafy structure of the fronds is displayed by its flexibility with the rhythmic surge of the water.  The alga is growing among the purple Bugula neritina and green Bryopsis plumosa.  Red and green algae compete with tunicates, bryozoa, mussels, and hydroids for space along the waterline.

Since taking these videos, I searched YouTube for videos of these species and found several outstanding microscopic videos of feeding bryozoan zooids and bryozoan reproduction and development.  These terrific videos are definitely worth viewing and are listed below the Links.

MIS Branching Bryozoan:  Bugula neritina
Branching Bryzoan and Red Alga:  Bugula neritina and Neosiphonia harveyi.  Includes more information about Bugula and a photo of Grateloupia turuturu from MacMillan Wharf.
Mathieson, A.C., Dawes, C.J., Pederson J., Gladych R.A. and Carlton J.T.   The Asian red seaweed Grateloupia turuturu (Rhodophyta) invades the Gulf of Maine. 
Coast Watch 2012:   Marine Invasives Overview.  Shows all 11 species on the MIMIC list including Bugula neritina and Grateloupia turuturu
Floating Dock Bryopsid Green Alga:  Bryopsis plumosa.

Short Video of Bugula Zooids:  Briozous (Bugula neritina).  From Eric Badosa.  Microscopic close-ups of feeding zooids featuring upbeat music.
Excellent Video of Feeding Bugula Zooids:  Bugula.  From Gulf Specimen Marine Laboratory.  Silent Video.
Educational Video Showing Development of Embryos:  Bugula neritina - the life cycle of a marine bryozoan.  From Alvaro Migotto.  Labeled, fast motion, microscopic live action featuring pleasant background music.
Sperm Release in a Bryozoid:  Through the tips of Tentacles.  From Alvaro Migotto.  Fascinating video showing ciliated tentacles and release of spermatozoa from the tips.