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1

Determinants of plant species richness in different wetland types along a hydrological gradient: implication for conservation

100%
Shi J., Ma K., Wang J., Zhang Y., Zhao J.
Polish Journal of Ecology
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2013
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tom 61
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nr 4
The loss of biodiversity caused by wetland degradation is a hot issue in ecology. It is known that hydrological degradation is the primary reason resulting in wetland degradation, but little is known about the relationship between plant species richness and environmental factors in different wetland types along a hydrological gradient. According to the gradient from high to low water level, wetland remnants in the Sanjiang Plain of northeast China were classified into three wetland types, which were permanently inundated marshes (PIM), seasonally inundated marshes (SIM) and wet meadows (WM) respectively. In this paper, we aimed to identify the determinants of plant species richness in the three wetland types and discern the transition of the determinants along a hydrological gradient. Plant species richness as well as area, habitat heterogeneity and resource availability was investigated in 51 wetland remnants, which were composed of 6 PIM, 25 SIM and 20 WM. Averagely, the area of wetland remnants occupied by PIM, SIM and WM was 0.35 ± 0.17 ha, 2.81 ± 2.88 ha and 1.34 ± 1.18 ha respectively. Aggregating the species in each wetland type, there were 67, 244 and 170 species recorded in PIM, SIM and WM. The determinants of species richness varied in different wetland types: standing water depth in PIM, area and water heterogeneity in SIM, and soil fertility and area in WM. With the decreasing water level, the influence of hydrological condition on species richness in the three wetland types declined while the impact of area and soil fertility gradually increased. Thus, hydrological condition was probably responsible for the transition of the determinants of species richness in different wetland types. Moreover, the habitat specialists of wetland would be lost when PIM or SIM degraded to WM. In order to conserve and restore plant diversity, specific measures should be taken including preventing area loss for all wetland remnants, managing the hydrological process for PIM and SIM, and regulating soil nutrient for WM.
2

On species-area relationships II: Slope and factor values of power function and exponential model

100%
Ulrich W.
Polish Journal of Ecology
|
2000
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tom 48
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nr 1
3

On the scale dependence of evenness

100%
Ulrich W.
Polish Journal of Ecology
|
2001
|
tom 49
|
nr 1
4

Species area relations generated by theoretical relative abundance distributions: parameter values, model fit and relation to species saturation studies

100%
Ulrich W.
Polish Journal of Ecology
|
2001
|
tom 49
|
nr 1
5

Factors affecting temporal dynamics of avian assemblages in a heterogeneous landscape

84%
Tworek S.
Acta Ornithologica
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2004
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tom 39
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nr 2
The influence of the characteristics of habitat fragments on the dynamics of avian communities and the effect that fragments of different sizes have on the stability of the breeding species composition, and also on local extinction, colonisation and turnover rates were studied in an agricultural landscape in southern Poland. The fragments included various habitat types that differed from the matrix. Breeding birds were surveyed using the territory mapping method to assess turnover. Species composition depended on both the spatial structure of a fragment and the features of its surroundings. Local declines and appearances of species had a similar influence on the turnover in all size classes of the fragments. Species that contributed most to the total turnover were: Lanius collurio, Phasianus colchicus, Anas platyrhynchos, Emberiza schoeniclus, Columba palumbus and Sylvia communis. However, there were differences among species contributing most to the turnover according to area size classes. Heterogeneous habitats in a mosaic-like, agricultural landscape do not function as islands. The existence of species in an area with such a level of habitat patchiness can be related primarily to habitat quality, mainly because of poor isolation and the high permeability of isolating habitats.
6

On species-area relationships III: The intercept of the power function and the exponential model

84%
Ulrich W.
Polish Journal of Ecology
|
2000
|
tom 48
|
nr 1
7

Species-area relationships of different plant functional groups in tropical monsoon rainforests (Hainan Island, China)

67%
Liu W.-D., Zang R.-G., Ding Y., Zhang W.-Y.
Polish Journal of Ecology
|
2013
|
tom 61
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nr 1
The positive relationship between the number of species in an area and the size of the habitat studied (species-area relationship, SAR) is the foundation of ecological theory and the most studied issues in ecology. However, very few studies have addressed SARs and their relationships to functional group richness and the extent of habitat area studied. We analyzed SARs in different functional groups focusing on two types of tropical monsoon rainforests on Hainan Island, China. The number of trees, shrubs, lianas, all species, deciduous species, evergreen species, thorn species, non-thorn species, simple-leaved species, and compound-leaved species were strongly related to the size of the area studied in the two tropical monsoon rainforest communities. And the size of the area studied explained over 94% of the total variations in the number of families and other groups studied. No significant differences were found for the slope of the species-area curve (Z) of different functional groups in two tropical monsoon rainforest communities except for shrubs that were taller in the Terminalia hainanensis community (TC) than in Liquidambar formosana community (LC). In the comparison of different functional groups divided by the same principle in the same tropical monsoon rainforest, no significant difference was found for the value of Z for different functional groups except that Z for lianas were higher than for shrubs in LC. However, the Z of lianas was higher than that of trees and shrubs, and evergreen species and species without thorns had higher Z values than deciduous species and species with thorns. No significant differences were found between simple-leaved species and compound-leaved species in TC. The results indicated the SARs of different plant functional groups can be well-described by the power function, although their slopes differed significantly.
8

Species-area relationships of plant communities and the possibility of predicting plant species diversity - a case study in South-Western Poland

67%
Swierkosz K.
Acta Botanica Silesiaca. Monographiae
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2009
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tom 05
9

Dispersal - limited biodiversity of tropical insular streams

67%
Covich A. P.
Polish Journal of Ecology
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2006
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tom 54
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nr 4
Numerous species are adapted for colonization of insular fresh waters by using different mechanisms of active and passive dispersal, especially among oceanic islands at low latitudes. Over time, similar animal communities have assembled in many tropical streams and rivers on isolated islands. These freshwater communities are characterized by a relatively low number of species of fishes, decapods, gastropods and insects that typically have complex life cycles including passive, long-distance dispersal. These species often disperse during marine phases with drifting larvae or by rafting and aerial transport of resistant, dormant stages. Active dispersal is sometimes effective for relatively short-distance movements from one island’s streams to another island’s nearby drainage basin within an archipelago (a “stepping-stones” dispersal pattern). Identifying distinct differences among aquatic communities on “true oceanic” islands of different ages and geologic histories requires a longterm biogeographic perspective including the degree of spatial isolation of populations and differences in rates of speciation. Consequently, the total biodiversity of insular streams is a complex combination of dispersal from multiple sources of species from continents and other islands, as well as evolution of new endemics. Recolonization of streams following natural disturbances and the impacts of introduced species result in dynamic changes in species accumulation and turnover in these insular freshwater ecosystems. Analysis of dispersal to islands provides general perspectives on managing fragmented habitats, especially the effects of invasive species that also shed light on factors affecting the equilibrium composition of animal communities in island-like ecosystems on continents.
10

On species-area relationships I: Fit of power function and exponential model

67%
Ulrich W.
Polish Journal of Ecology
|
2000
|
tom 48
|
nr 1
11

Regional and local faunas of parasitic Hymenoptera

67%
Urlich W.
Polskie Pismo Entomologiczne
|
1999
|
tom 68
|
nr 3
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