Contemporary and emerging fisheries in The Bahamas—Conservation and management challenges,achievements and future directions          下载免费PDF全文

Krista D. Sherman  Aaron D. Shultz  Craig P. Dahlgren  Claire Thomas  Edward Brooks  Annabelle Brooks  Daniel R. Brumbaugh  Lester Gittens  Karen J. Murchie 《Fisheries Management and Ecology》2018,25(5):319-331

The harvest of marine resources has long‐standing cultural and economic importance to The Bahamas and other small island developing states. Tourists and residents place a demand on local marine resources, particularly Caribbean spiny lobster, Panulirus argus (Latreille), queen conch, Lobatus gigas (Linnaeus) and Nassau grouper, Epinephelus striatus (Bloch), and many fishery products are also sold on the global market. Illegal, unreported and unregulated fishing coupled with inadequate regulations and enforcement are the main factors contributing to the decline of Bahamian fisheries along with other anthropogenic impacts. This article reviews the status of fisheries management in The Bahamas using economically and ecologically important species as case studies to highlight conservation successes, knowledge gaps and deficiencies in existing management approaches. The review concludes with an examination of how emerging fisheries and improved conservation management strategies have the potential to improve economic and food security throughout the archipelago.  相似文献   

Independent selection for seed free tryptophan content and vernalization response in chickpea domestication          下载免费PDF全文

Ruth P. van‐Oss  Avi Gopher  Zohar Kerem  Zvi Peleg  Simcha Lev‐Yadun  Amir Sherman  Hong‐Bin Zhang  George Vandemark  Clare J. Coyne  Ofer Reany  Shahal Abbo 《Plant Breeding》2018,137(3):290-300

Chickpea shows a distinct domestication trajectory vis‐a‐vis pod dehiscence and growth cycle mediated by vernalization insensitivity compared with its companion Near Eastern legumes. Our objectives were: (i) to map the quantitative trait loci (QTLs) associated with vernalization response and seed free tryptophan in domesticated × wild chickpea progeny and (ii) estimate the genetic correlation between vernalization response and free tryptophan content. A domesticated × wild chickpea cross was used to document phenotypic segregation in both traits and to construct a skeletal genetic map for QTL detection. A number of vernalization response and seed free tryptophan content QTLs were documented in both F₂ and F₃ generations. No significant genetic correlation between these two traits was observed. Epistatic relationship between two free tryptophan loci was documented. It is evident that selection for high seed tryptophan is easier to accomplish relative to selection for vernalization insensitivity. This suggests that the two traits were selected independently in antiquity, thereby corroborating earlier claims for conscious selection processes associated with chickpea domestication.  相似文献   

不同耕作方式对宁南旱地土壤团聚体的影响   总被引：5，自引：0，他引：5  

严波  贾志宽  韩清芳  杨宝平  聂俊峰 《干旱地区农业研究》2010,28(3):58-63

在宁南旱区对试验耕地定位实行连年传统翻耕(CT)、隔年免耕—深松(NT→ST)及深松—免耕(ST→NT)三种不同处理。用干筛法和湿筛法对连续3年处理后土壤团聚体的变化进行测定,分析结果表明,干筛法中NT→ST处理在0~40 cm土层中0.25 mm的机械稳定性团聚体比处理前和CT处理分别高33.11%、29.51%;ST→NT处理在0~40 cm土层中0.25 mm机械稳定性团聚体含量比处理前和CT处理分别高40.51%、36.91%。湿筛法中NT→ST处理在0~30 cm土层中0.25 mm的水稳性团聚体含量比处理前高7.33%,NT→ST处理在0~10 cm土层0.25 mm的水稳性团聚体比CT处理高1.47%,而在10~40 cm土层NT→ST处理和CT0.25 mm的水稳性团聚体含量差异不显著;ST→NT处理在0~40 cm土层中0.25 mm水稳性团聚体含量比处理前和CT处理分别高10.75%、10.12%。分析结果同时说明,采用深松—免耕(ST→NT)轮耕方式更有利于土壤团聚体含量和稳定性的增加。  相似文献   

Torsion and displacement of the large colon     

K. Sherman DVM 《Journal of Equine Veterinary Science》1996,16(6):237-239

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