|Table of Contents|

The effects of habitat fragmentation on the reproductive success of Circaeaster agristis in the Wanglang Nature Reserve(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2016 01
Page:
151-155
Research Field:
Articles
Publishing date:

Info

Title:
The effects of habitat fragmentation on the reproductive success of Circaeaster agristis in the Wanglang Nature Reserve
Author(s):
QU Jiao1 WU Bixian1 SU Liming2 & CAO Guoxing1 3**
1Faculty of Forestry, Sichuan Agricultural University, Wenjiang 611130, China 2Office of Soil and Water Conservation of Pingwu County, Sichuan Province, Pingwu 622550, China
Keywords:
Circaeaster agristis habitat fragmentation population size population density reproduction
CLC:
Q948.1
PACS:
DOI:
10.3724/SP.J.1145.2015.05046
DocumentCode:

Abstract:
Habitat fragmentation and the resulting decline in population size and density commonly reduce the reproductive success of plant species, and is therefore considered a major threat to population viability and persistence. To understand the effects of population size and density on reproductive success is important for guidelines in species conservation. In this research we investigated the impacts of habitat fragmentation on the reproductive success of Circaeaster agristis, a narrow endemic and threatened species, in the Wanglang Nature Reserve. We explored how reproductive success was related to population area and density in 35 populations, and examined the effects of nearest neighbor distance (NND) and local neighbor size (LNS) within the radius of 0.1 m on reproductive success in two of the populations. The results showed that population size and density did not affect fruit (seed) number or fruit set of individual C. agristis (P > 0.05). Within populations, the individual fruit number did not change (P = 0.447), with the individual fruit set increasing independently of plant size (P = 0.032), in response to the increasing NND. Both the individual fruit number (P = 0.001) and individual fruit set (P < 0.001) increased, independently of plant size, with decreases in LNS within a 0.1 m radius. The effect of habitat fragmentation on reproduction of C. agristis is scale-dependent. In contrast to the generally accepted idea that fragmentation reduces plant reproduction, our results indicate that reproductive success may increase in response to the increase of NND or the decrease of LNS in C. agristis.

References

1 Fahrig L. Effects of habitat fragmentation on biodiversity [J]. Annu Rev Ecol Evol Syst, 2003, 34: 487-515
2 Saunders DA, Hobbs RJ, Margules CR. Biological Consequences of Ecosystem Fragmentation: A Review [J]. Conserv Biol, 1991, 5 (1): 18-32
3 ?gren J. Population size, pollinator limitation, and seed set in the self-incompatible herb Lytrhum salicaria [J]. Ecology, 1996, 77 (6): 1779-1790
4 Jakobsson A, Lázaro A, Totland ?. Relationships between the floral neighborhood and individual pollen limitation in two self-incompatible herbs [J]. Oecologia, 2009, 160 (6): 707-719
5 胡世俊, 何平, 张春平, 张益锋. 破碎生境中种群大小对缙云卫矛生殖成功的影响[J]. 生态学杂志, 2013, 32 (4): 821-824 [Hu SJ, He P, Zhang CP, Zhang YF. Effects of population size on reproductive success of endangered plant Euonymus chloranthoides Yang in fragmented habitat [J]. Chin J Ecol, 2013, 32 (4): 821-824]
6 Klinkhamer PGL, de Jong TJ. Effects of plant size, plant density and sex differential nectar reward on pollinator visitation in the protandrous Echium vulgare (Boraginaceae) [J]. Oikos, 1990, 57 (3): 399-405
7 Hermansen TD, Ayre DJ, Minchinton TE. Effects of stand size on pollination in temperate populations of the mangrove Avicennia marina [J]. Plant Ecol, 2014, 215 (10): 1153-1162
8 Leimu R, Mutikainen P, Koricheva J, Fischer M. How general are positive relationships between plant population size, fitness and genetic variation? [J]. J Ecol, 2006, 94 (5): 942-952
9 Ghazoul J. Pollen and seed dispersal among dispersed plants [J]. Biol Rev, 2005, 80 (3): 413-443
10 Stein K, Templin M, Hensen I, Fischer M, Matthies D, Schleuning M. Negative effects of conspecific floral density on fruit set of two neotropical understory plants [J]. Biotropica, 2013, 45 (3): 325-332
11 Ward M, Johnson SD, Zalucki MP. When bigger is not better: intraspecific competition for pollination increases with population size in invasive milkweeds [J]. Oecologia, 2013, 171 (4): 883-891
12 Aguilar R, Ashworth L, Galetto L, Aizen MA. Plant reproductive susceptibility to habitat fragmentation: review and synthesis through a meta-analysis [J]. Ecol Lett, 2006, 9 (8): 968-980
13 Harper JL. Population Biology of Plants [M]. New York: Academic Press, 1977: 67-71
14 Weiner J. A neighborhood model of annual-plant interference [J]. Ecology, 1982, 63 (5): 1237-1241
15 Metcalfe DB, Kunin WE. The effects of plant density upon pollination success, reproductive effort and fruit parasitism in Cistus ladanifer L. (Cistaceae) [J]. Plant Ecol, 2006, 185 (1): 41-47
16 Wagenius S. Scale dependence of reproductive failure in fragmented Echinacea populations [J]. Ecology, 2006, 87 (4): 931-941
17 Spigler RB, Chang SM. Effects of plant abundance on reproductive success in the biennial Sabatia angularis (Gentianaceae): spatial scale matters [J]. J Ecol, 2008, 96 (2): 323-333
18 傅立国, 金鉴明. 中国植物红皮书——稀有濒危植物(第一册)[M]. 北京: 科学出版社, 1992: 194-195 [Fu LK, Jin JM. China Plant Red Data Book: Rare and Endangered Plants (Vol 1) [M]. Beijing: Science Press, 1992: 194-195]
19 任毅, 李智军, 胡正海. 基于形态学资料星叶草属系统位置的探讨[J]. 西北植物学报, 2003, 23 (7): 1091-1097 [Ren Y, Li ZJ, Hu ZH. Approaches to the systematic position of Circaeaster based on the morphological data [J]. Acta Bot Bor-Occid Sin, 2003,23 (7): 1091-1097]
20 张远彬, 王开运, 鲜骏仁, 胡庭兴. 川西亚高山白桦林小气候的时空动态特征[J]. 应用与环境生物学报, 2006, 12 (3): 47-51 [Zhang YB, Wang KY, Xuan JR, Hu TX. Temporal and spatial dynamics characteristics of microclmiate in subalpine Birch forest in western Sichuan [J]. Chin J Appl Environ Biol, 2006, 12 (3): 47-51]
21 Roll J, Mitchell RJ, Cabin RJ, Marshall DL. Reproductive success increases with local density of conspecifics in a desert mustard (Lesquerella fenleri) [J]. Conserv Biol, 1997, 11 (3): 738-746

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Last Update: 2016-02-25