o ai r frum audside con come 18 (10 pts) Describe or draw two different O2 profi
ID: 542246 • Letter: O
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o ai r frum audside con come 18 (10 pts) Describe or draw two different O2 profiles (and OMZ) for 1) high productivity summer time and 2) low productivity winter time. Clearly label the two profiles and indicate three specific differences you would expect to observe between the two profiles. Summe Comes higher tenpeotr es 19) (10 pts) Iron limiting waters in HNLP zones are direct controls of primary production in very large areas of the equatorial Pacific and Southern Oceans. Name two sources of Fe to these regions. Are these processes likely changing due to climate changes and how are they going to impact primary production in HNLP zones.Explanation / Answer
19. Ans = microbial activity is a fundamental components of oceanic nutrient cycles . Photosynthetic microbes collectively termed phytoplankton are responsible for the vast majority of primary production in marine water .the available of nutrients in the upper ocean frequently limits the activity and abundance of these organisms.experimental data are revealed two broad regimes of phytoplankton nutrients limitations in the modern upper ocean . Nitrogen available is tend to limit productivity throughout much of the surface is realtively slow. In contrast iron often limits productivity where subsurface nutrients supply is enhanced, including within the main oceanic upwelling regions of the southern ocean and the Eastern equatorial pacific. Phosphorus, vitamins,and micronutrients other than iron may also co limit marine phytoplankton. The spital pattern and important of co limitations. However remain unclear .variability in the stoichiometric of nutrients supply and biological demand are key determinants of oceanic. Nutrients limitations. Deciphering the mechanism that underpin this variability and consequences for Marin microbes will be challenged.
18.Ans= low oxygen condition organisms have evolved to live in and around OMZS.for those organism , like vampire squid, special adaptation are needed to either make do with lesser amounts of oxygen from the or do extract oxygen from the water more efficiently.for example gnathophausia ingens continue to live aerobically in OMZs .they have highly developed gills with large surface area and thin blood to water diffusion distance that enables effective removal of oxygen from water and an efficient circulatory system with high capacity and high blood concentration of protein that readily bonds oxygen . Another strategy used by some class of bacteria in oxygen minimum zone is to use nitrate rather than oxygen thus drawing down the concentration important nutrients.this process is called denitrification. The oxygen minimum zones lays an important role in regulating the productivity and ecological community structure of the global ocean.
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