I f you spend a minute observing behaviour at your next party, it is easy to grasp the basics of sexual selection theory females are choosy and males compete. But how do you choose or compete for the best partner when you are permanently stuck to a rock? Most marine organisms reproduce by releasing their eggs and sperm into the ocean. This mode of reproduction is called broadcast spawning. You'...

© 2012 Alava and Gobas, licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Assessing Biomagnification and Trophic Transport of Persistent Organic Pollutants i...

Heterochronic developmental plasticity of the juvenile rudiment and larval body of sea urchin larvae occurs in response to supply of food. Evolutionary increase in egg size can also be associated with earlier development of the juvenile rudiment. We examined effects of egg volume of feeding larvae on this heterochrony and other changes in larval form. (1) Evolutionary and experimental enlargeme...

Steller's sea cow, a giant sirenian discovered in 1741 and extinct by 1768, is one of the few megafaunal mammal species to have died out during the historical period. The species is traditionally considered to have been exterminated by 'blitzkrieg'-style direct overharvesting for food, but it has also been proposed that its extinction resulted from a sea urchin population explosion triggered by...

  Neogobius caspius is an endemic species of the Caspian Sea which plays an important role in food chain as a predatory fish. The main aim of this study was to investigate selected feeding characteristics of Neogobius caspius in the south west coasts of the Caspian Sea. Monthly sampling was carried out using a bottom trawler at three stations (Astara, Anzali and Chabuksar) in three depths (0-5,...

The various conventional methods of procuring ripe gametes from sea stars (1, 2), and sea urchins (3, 4, 6) are well suited for experiments in which large quantities or pooled lots of gametes from different individuals are required . It is often desirable, however, to perform experiments on a few cells, under well controlled conditions and from a single individual . For this purpose I have devi...

Fish are highly nutritious food items. In most countries, fish is one of the significant sources of animal protein and essential nutrients for the maintenance of health and protection from different types of diseases, such as blood pressure, cancer and heart stroke [1]. Sea food products reduce vulnerability to hunger by providing a complementary food source when other food sources, such as agr...

male infertility is a distressingly common condition affecting about 1 in 20 of the male population. in a majority of the cases, the male partner produces sufficient numbers of spermatozoa to achieve fertilization but there are functional defects in these cells that prevent conception from occurring. in this study, the effects of wi-fi radiation on spermatogenesis, testes and testosterone of la...

A bacterium capable of producing a deep blue pigment was isolated from the environment and identified as Pantoea agglomerans. The pigment production characteristics of the bacterium under various conditions were studied. The optimal agar plate ingredients for pigment production by the bacterium were first studied: the optimal ingredients were 5 g/liter glucose, 10 g/liter tryptic soy broth, and...

Is Pu-er in Zomia?: Tea Cultivation and the State in China Peter C. Perdue Agrarian Studies Colloquium, October 24, 2008 "We ordinarily count Yunnan among the provinces of the Chinese empire, but if one leaves the main lines of communication, entering the interior, traveling through the deserts and mountains, you are always in the territory of Yunnan, but you are no longer in China; you are in ...