scholarly journals Effects of habitat fragmentation on population structure and dynamics of the endangered plant Pterospermum kingtungense

2021 ◽  
Vol 29 (4) ◽  
pp. 449-455
Author(s):  
Guoping Yang ◽  
Tao Wu ◽  
Yunfen Geng ◽  
Xiaoshuang Li ◽  
Jiabo Hao ◽  
...  
Keyword(s):  
Population Structure ◽  
Habitat Fragmentation ◽  
Endangered Plant ◽  
Structure And Dynamics ◽  
Population Structure And Dynamics

scholarly journals Structure and dynamics of a Cariniana estrellensis (Lecythidaceae) population in a fragment of Atlantic Forest in Minas Gerais, Brazil

Rodriguésia ◽  
2012 ◽  
Vol 63 (2) ◽  
pp. 257-267 ◽  
Author(s):  
Yule Roberta Ferreira Nunes ◽  
Miguel Petrere Jr.
Keyword(s):  
Population Structure ◽  
Seed Production ◽  
Size Structure ◽  
Canopy Cover ◽  
High Rate ◽  
Structure And Dynamics ◽  
Seedling Bank ◽  
Phase Size ◽  
Population Structure And Dynamics ◽  
Establishment Phase

We aimed to describe population structure and dynamics of Cariniana estrellensis (Raddi) Kuntze to test the hypothesis that this species survives in the forest by forming a seedling bank. We evaluated seed germination, spatial distribution, and recruitment, growth and mortality rates of young individuals. To characterize population structure a 1.2-ha plot was defined, where reproductive adults were mapped; also 100 6 m² sub-plots were established to characterize structure and monitor dynamics of young individuals. We estimated seed production using seed collectors and determined the percentage of canopy cover by hemispherical photographs. Seed rain and saplings showed clustered distribution indicating habitat-patch formation. Sapling mortality occurred mainly during the initial establishment phase. Size structure was characterized by many saplings (X = 9,763 individuals ha-1) and few adults (X = 5 individuals ha-1), associated with a high rate of seed production (X = 60,800 seeds ha-1), low growth rates (X = 2.37 cm ano-1) and mortality (15.66%) of established saplings, showing that species invest in seedling bank formation as a reproductive strategy.

Population structure and dynamics of Arctic willow (Salix arctica ) in the High Arctic

2014 ◽  
Vol 41 (10) ◽  
pp. 1967-1978 ◽  
Author(s):  
Noémie Boulanger-Lapointe ◽  
Esther Lévesque ◽  
Stéphane Boudreau ◽  
Gregory H. R. Henry ◽  
Niels Martin Schmidt
Keyword(s):  
Population Structure ◽  
High Arctic ◽  
Structure And Dynamics ◽  
Salix Arctica ◽  
Population Structure And Dynamics

Population structure and dynamics of insecticide resistance genes in Culex pipiens populations from Italy

Heredity ◽  
1998 ◽  
Vol 81 (3) ◽  
pp. 342-348 ◽  
Author(s):  
Francesco Silvestrini ◽  
Carlo Severini ◽  
Valeria di Pardo ◽  
Roberto Romi ◽  
Elvira de Matthaeis ◽  
...  
Keyword(s):  
Population Structure ◽  
Insecticide Resistance ◽  
Resistance Genes ◽  
Culex Pipiens ◽  
Structure And Dynamics ◽  
Population Structure And Dynamics

Sustainable yield of the red swamp crayfish (Procambarus clarkii) through understanding its population structure and dynamics in Poyang Lake

Crustaceana ◽  
2012 ◽  
Vol 85 (4-5) ◽  
pp. 415-431 ◽  
Author(s):  
Yu Huang ◽  
Shu Jun Wang ◽  
Yin Gen Dai ◽  
Chun Lin Fang ◽  
Ming He Xiao ◽  
...  
Keyword(s):  
Population Structure ◽  
Procambarus Clarkii ◽  
Poyang Lake ◽  
Population Analysis ◽  
Biological Data ◽  
Sustainable Yield ◽  
Fishery Resource ◽  
Structure And Dynamics ◽  
Red Swamp Crayfish ◽  
Population Structure And Dynamics

With increasing commercial demand for its delicacy, Procambarus clarkii has become an important fishery resource of Poyang Lake in recent years. However, habitat loss, overfishing, and the crayfish plague have diminished P. clarkii populations throughout their area of distribution. In consequence, this study systemically analyses the population structure and dynamics of P. clarkii in the wetland of Poyang Lake using the analytical methods of Bhattacharya and Von Bertalanffy. The main purpose was to collect biological data necessary for the management of this species. The present study showed that the population structure consisted of a maximum of 5.58 age classes for females and 3.25 for males, which indicated that P. clarkii is a relatively short-lived species. The Y′/R analysis showed that Epresent > E0.5, which exceeded the optimization (Eopt) criterion of 0.5 for sustainable exploitation of fisheries, so this species was overexploited in Poyang Lake. The Lc (mean length at first capture) equals 67.5 mm. The estimated mesh size for catching the red swamp crayfish is 13.5 cm. The virtual population analysis model (VPA) showed that the largest annual catch of P. clarkii is 3.43 × 104 t. The Maximum Sustainable Yield (MSY) is 1.18 × 104 t. The low natural mortality rate range of 0.68-1.11 year−1 suggested that it is ecologically worthwhile to allow the individuals of P. clarkii to grow to larger sizes in order to contribute to the biomass for biologically optimal exploitation. This could be facilitated by the adoption of measures involving a closed season, which would help to conserve the fishery.

Impact of tree harvesting on the population structure and dynamics ofPinus koraiensis(Pinaceae)

2015 ◽  
Vol 35 (1) ◽  
Author(s):  
张悦 ZHANG Yue ◽  
易雪梅 YI Xuemei ◽  
王远遐 WANG Yuanxia ◽  
姬兰柱 JI Lanzhu ◽  
吴培莉 WU Peili
Keyword(s):  
Population Structure ◽  
Structure And Dynamics ◽  
Population Structure And Dynamics ◽  
Tree Harvesting
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