User:LHWags/Ocean gyre

notes:

mla citation: Encyclopedia of Ocean Sciences, Elsevier Science & Technology, 2019. ProQuest Ebook Central, https://ebookcentral.proquest.com/lib/osu/detail.action?docID=5751162.

pg 601/578 in textbook notes the most studied gyres ** wiki wants pages cited**

Ocean gyres typically contain 5-6 trophic levels.

"dominant phytoplankton" are very small - limiting factor for number of trophic levels. In low oxygen zones, oligotrophs are responsible for a large percentage of the phytoplankton.

Gyres experience seasonal variations in both their physical vertical and trophic structures.

Depending on their location around the world, gyres can be regions of high productivity or low productivity. Subtropical gyres are typically areas with little life, often referred to as "biological deserts", whereas subpolar gyres are Subtropical gyres are known to be areas with little biological activity, often referred to as "biological deserts".

see Karl-TOS-IOC-GyreBioregimes from bgc page

At lowest trophic levels:

At the lowest trophic levels, there
 * seasonal variations in vertical structure and trophic organization
 * Warm subtropical gyres have some of the least productive waters in the ocean (p753-754)
 * they are very oligotrophic (low in oxygen)
 * sub arctic north atlantic gets a seasonal boost of nutrients in surface waters (say this differently) (p754)
 * north pacific has no comparable bloom as small plankton are eaten by bigger microzooplankton before there can be a large number of them.
 * this makes the waters in the north pacific chlorophyll limited and nitrogen rich