Light - marine ecosystems, Biology

Assignment Help:

Light - Marine Ecosystems

Light is a limiting factor in the ocean as it contributes significantly to organic production and distribution of marine life. The ocean is divisible on the basis of the light penetration into two horizontal zones:

1. The lighted photic or euphotic zone extending from the sea surface up to a depth of 200 metres, where sufficient light reaches to support photosynthesis. This photic zone, also called the epipelagic one, is characterised by sharp gradients or light, temperature and salinity. The amount of light reaching the lower level of this zone rarely exceeds 0.0001% of what is received at the surface. Below this is the

2. Aphotic or lightless zone which distinguishable into three further sub-zones

  • Mesopelagic which extends from 200 metres to 1.0(10 metres. This zone is in semi-darkness as very little light penetrates it. Here temperature gradient is more even and gradual, without much seasonal variation. Further this zone contains a minimum of oxygen and a maximum of nitrates and phosphates. Next is the
  • Bathypelagic zone which extends from 1,000 metres to 2,000 metres and where darkness IS virtually complete, tor humans though some fishes and crustacean do respond to dim light. The third and the lower most zone is the
  • Abyssopelagic zone where permanent darkness prevails and where temperature is uniform at 3°C and hydrostatic pressure is enormous.

Related Discussions:- Light - marine ecosystems

Permissive interaction - pancreas development, Permissive Interaction - Pan...

Permissive Interaction - Pancreas Development Figure describes the development of pancreas in a mammal. In an organism like mouse the pancreas is first seen as a diverticulum

Class of crustacea - branchiopoda, Class of Crustacea - Branchiopoda ...

Class of Crustacea - Branchiopoda These are small fresh water crustaceans. The trunk appendages are flattened and leaf like and are helpful for locomotion also respiration he

What are some factors that can lead to protein denaturizing, Protein denatu...

Protein denaturizing can be source by temperature variation, pH change, and changes in the concentration of surrounding solutes and by other processes. Most proteins are denatured

Precautions for determination of iodine number of lipids, Precautions for d...

Precautions for determination of iodine number of lipids? 1. If using the pipette for transferring the oil, allow the pipette to drain slowly and completely, as oil takes time

Protozoa phylum, what is the main quality of this phylum

what is the main quality of this phylum

Peri operative myocardial infarction, Peri operative Myocardial Infarction ...

Peri operative Myocardial Infarction :  Peri operative Myocardial Infarction is diagnosed by the appearance of fresh Q waves. Non-Q, myocardial infarction is suspected when there

For the biological diversity is mitosis or meiosis, For the biological dive...

For the biological diversity is mitosis or meiosis the more important process? Meiosis is the cell division process that permits the formation of gametes to sexual reproduction

HUMAN SKELETON, What are the main components of the human skeleton?

What are the main components of the human skeleton?

Why it is important to study about soil, Why does one need to study about s...

Why does one need to study about soil and what is  its importance? You would be aware that, from the dawn of agriculture, cultivators were attracted to fertile soils of river

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd