Seasonal Changes in Bacterial Flora of Fish Pond Sediments in Saudi Arabia

Abstract Group size variations of the Arabian sand gazelle Gazella subgutturosa marica were studied during a period of drought at the Mahazat as-Sayd Protected Area in central western Saudi Arabia. Significant differences in median group sizes were observed between all seasons except summer. Single animals were observed mainly during summer while group sizes exceeding 10 individuals were observed mainly during winter. Solitary male and female groups were typically observed during winter and mixed groups mainly during the autumn rutting period. Most mixed groups were two to four times larger during winter than summer. The adult sex ratio (male: female) for all seasons combined was in parity and highest during autumn (1:1.23), probably as a result of prolonged drought conditions. The variability in group structure related to environmental conditions may be one factor permitting G. s. marica to adapt to hyper-arid habitats and climatic regimes in central western Saudi Arabia. The value of continuous monitoring of the gazelle population is emphasised for this drought prone region.

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Seasonal Changes of Bacterial Flora in Activated Sludge System for Swine Wastewater

Nihon Chikusan Gakkaiho ◽

10.2508/chikusan.71.9_362 ◽

2000 ◽

Vol 71 (9) ◽

pp. 362-369 ◽

Cited By ~ 2

Author(s):

Eiji TAKAHASHI ◽

Chieko FURUKAWA ◽

Akemi YAMAMOTO ◽

Kiyoshi OKADA ◽

Mitsuhiro OKADA ◽

...

Keyword(s):

Activated Sludge ◽

Seasonal Changes ◽

Bacterial Flora ◽

Swine Wastewater ◽

Activated Sludge System

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Potential of Fish Pond Sediments Composts as Organic Fertilizers

Waste and Biomass Valorization ◽

10.1007/s12649-020-01074-6 ◽

2020 ◽

Vol 11 (10) ◽

pp. 5151-5163

Author(s):

D. Dróżdż ◽

K. Malińska ◽

M. Kacprzak ◽

M. Mrowiec ◽

A. Szczypiór ◽

...

Keyword(s):

Phaseolus Vulgaris ◽

Wheat Straw ◽

Organic Fertilizers ◽

Fish Pond ◽

Waste Materials ◽

Phaseolus Vulgaris L ◽

Growing Media ◽

Valuable Source ◽

Carbon And Nitrogen ◽

Pond Sediments

Abstract Increased fish pond production is associated with the generation of various waste including fish pond sediments. Fish pond sediments could be a valuable source of nutrients for growing plants, however they require further processing in order to be applied to soil. Composting is considered one of the methods for processing fish pond sediments. The aim of this work was to investigate the potential of organic fish pond sediments to be managed through laboratory composting with selected waste materials and evaluate the fertilizing potential of the obtained compost. The scope included: (1) analysis of organic fish pond sediments, (2) laboratory composting of organic fish pond sediments with wheat straw and green grass, (3) analysis of the obtained composts, (4) preparation of growing media with selected additives, (5) analysis of the properties of the prepared growing media and (6) analysis of the effect of the investigated growing media on the growth of Phaseolus vulgaris L. in pot experiments. The addition of cardboard waste and woodchips derived biochar to the obtained compost improved significantly the growth of the roots of Cardamine L. Also, the content of carbon and nitrogen in the compost mixtures increased. The addition of M1 (compost from organic fish pond sediments and 1% of biochar) to the soil had a significant impact on the growth of white beans. Graphic Abstract

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