Dissertation > Excellent graduate degree dissertation topics show

The Research on Natural Habitat and Conservation Measures of Tanichthys Albonubes in Shimen National Forest Park

Author: LiKe
Tutor: WangDeLiang
School: Central South University of Forestry Science and Technology
Course: Conservation and Utilization of Wild Fauna and Flora
Keywords: Tang fish Habitat Natural populations Feeding habits Shimen National Forest Park
CLC: S863
Type: Master's thesis
Year: 2010
Downloads: 46
Quote: 0
Read: Download Dissertation

Abstract

Tang fish (Tanichthys albonubes) is a small stream fishes belonging to the national the II level key protection of aquatic wildlife, but also the most representative one of the fish in Guangdong. Tang fish endangered category in the \2003 Tang fish natural populations found in Guangzhou Conghua. Shimen National Forest Park of strong support, of the period from April 2009 to March 2010, Tang fish habitat Shimen Park site survey. Of Park River water quality, plankton, surrounding plant community composition, ecological habits and distribution pattern of the Tang fish habitat and altitude factors Tang fish relationship and Tang fish predators and competitive species of larval fish habitat environment and feeding habits The relationship between the survey. The results show that: Don body length in the range of 25.94mm-31.81mm, the average weight of 0.179 g. In addition to the individual points, all samples distributed throughout the year Don fish; August Tang fish quantity February least; Tang fish of the year the most stable distribution of sample points including samples 3 samples, sample The point 7 samples, samples 10 samples 11, covering all kind of line description of each kind online has Tang fish habitat. # 3 and # 7 is the main habitat of the Tang fish juveniles, the common characteristics of these two places is the calm surface of the water, and abundant aquatic plants, the water depth is shallow and stable. Shimen Park wild Tang fish habitats can be divided into the U-river sediment sediment streams and gravel sediment stream three types. Tang fish habitat mainly has the following characteristics: 1) streams or swamps, the water flow is slower. The Tang fish preferences flocks edge of the large surface of the water in the streams downstream; 2) aquatic plant distribution-intensive, sedge and grasses gravel sediment habitat leaves more; 3) associated with fish classes. No other fish in the marsh habitat; basic sediment and debris and sediment stream habitat striped two is required caldwelli (Puntiussemifasciolatus), intends fine crucian carp (Nicholsicypris normaalis) on a small number of fish associated. 4) water temperature, water quality is constant. Water temperature between 14 ℃ to 22 ℃ Ⅱ, water quality-based. The Tang fish distribution lowest altitude 282m, up to 848m, as the main distribution area in the the 280m around interval and the interval of about 800m; Tang fish distribution of water depth is generally not more than 0.7m uncertain waters of width, 0.4 m to 6.5m. Above sea level, the water body width, flow velocity and human interference Tang fish born throughout the main factor which flow velocity and human interference can alone reflect the impact on the choice of habitat; while the water depth of the river bottom composed of Tang fish of Health Habitat choose affect not. Tang fish habitat selection by the pH (pH6.5 ± 2.5) and nitrates affect water quality in low pollution levels Tang fish suitable habitat. Tang fish, habitat, water quality and vegetation composition Tang fish food influential role juveniles preference is calm and plants to distribution of the waters, low oxygen content. Suitable for rotifer microzooplankton breeding. Adult preference larger zooplankton, the preferences of the high oxygen content, and water quality can meet some Cladocera breeding waters. Study site of 14 species of birds, fish, amphibians, seven kinds of its main predator species and memory in Tang fish natural enemies, mainly birds, water snakes and other natural enemies of population size directly affects the Tang fish populations. Also found to constitute a competitive relationship with Tang fish species, protected areas in the same waters, when the dace (Cirrhinus molitorella), a large number of flowers Loach (Cobitinae loaches), Tang fish less; dace, flowers mahi number fewer Tang fish in larger quantities. The impact of human activities on Tang fish mainly refers to human fishing, power plants, power generation and water pollution. When the water of the power plant, due to the interception of a dam, leading Tang fish swimming downstream can not be successfully Tang fish can only choose to live in the upper reaches of the stream;, the water of the power plant due to the rate of water flow, fish water brought to the part of Don downstream of life, thereby changing the location of the distribution of the Tang fish. When the river is polluted, the Tang fish migration or pollutants poisoned, thus changing the location and quantity of the Tang fish distribution. The results also show that Don reduction of fish resources and habitat destruction, Tang fish habitat protection wild the Tang fish resources protection is the most effective way.

Related Dissertations

CLC: > Agricultural Sciences > Livestock, animal medicine,hunting,silkworm,bee > Hunting,domestication of wild animals > The the protection of of the wild animals and hunting restrictions
© 2012 www.DissertationTopic.Net Mobile