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| Malay, Maria Celia (machel) D.; Paulay, Gustav. |
| The diversity on coral reefs has long captivated observers. We examine the mechanisms of speciation, role of ecology in speciation, and patterns of species distribution in a typical reef-associated clade-the diverse and colorful Calcinus hermit crabs-to address the origin of tropical marine diversity. We sequenced COI, 16S, and H3 gene regions for similar to 90% of 56 putative species, including nine undescribed, "cryptic" taxa, and mapped their distributions. Speciation in Calcinus is largely peripatric at remote locations. Allopatric species pairs are younger than sympatric ones, and molecular clock analyses suggest that > 2 million years are needed for secondary sympatry. Substantial niche conservatism is evident within clades, as well as a few major... |
| Tipo: Text |
Palavras-chave: Allopatric speciation; Biodiversity; Biogeography; Color pattern evolution; Circumtropical speciation; Coral reef; Coral triangle; Cryptic species; Crustacea; ESU; Indo-Malayan hot spot; Molecular phylogenetics; Sympatric speciation. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00495/60623/64108.pdf |
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| Tegla, Zsolt; Varga, Erika; Hagen, Istvan Zsombor. |
| Within the branch of horticultural production, vegetable forcing can play a very significant role in the future employment of the rural labour force, due to its less seasonal employment and high workforce demand. Taking the ecological endowments of Hungary into consideration the farms of the South Great Plains may play a decisive role in this. During our research we examined eight model hydro-cultured vegetable forcing farms that are competitive due to their income-generating capacity and are suitable for further development. We concluded that pepper forcing farms of 1 ha generated €138,980 SGM, tomato forcing farms €129,486 SGM and cucumber forcing farms €121,641 SGM. By dividing the Standard Gross Margin by €1,200 we found that the farms examined... |
| Tipo: Journal Article |
Palavras-chave: Production value; Variable costs; ESU; Vegetable forcing; Income; Agribusiness; Farm Management; Production Economics. |
| Ano: 2008 |
URL: http://purl.umn.edu/48096 |
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