Soil fungal networks moderate density‐dependent survival and growth of seedlings

2021 ◽  
Author(s):  
Minxia Liang ◽  
Liuqing Shi ◽  
David F. R. P. Burslem ◽  
David Johnson ◽  
Miao Fang ◽  
...  
Keyword(s):  
Density Dependent ◽  
Moderate Density ◽  
Survival And Growth ◽  
Growth Of Seedlings

Survival and Growth of Seedlings of Three Sclerophyll Species at High Levels of Phosphorus and Nitrogen

1976 ◽  
Vol 24 (6) ◽  
pp. 681 ◽  
Author(s):  
RH Groves ◽  
K Keraitis
Keyword(s):  
Sand Culture ◽  
Growth Responses ◽  
High Nitrogen ◽  
Nutrient Contents ◽  
Rooting Zone ◽  
Nitrogen Levels ◽  
High Phosphorus ◽  
Survival And Growth ◽  
Four Levels ◽  
Growth Of Seedlings

Seedlings of Banksia serrata, Acacia suaveolens and Eucalyptus pilularis were grown in sand culture for 3-4 months at four levels of phosphorus (0, 5, 50, and 100 ppm) and three of nitrogen (0, 25 and 250 ppm) applied gradually in all combinations. B.serrata died at high phosphorus-high nitrogen levels, A.suaveolens died with high phosphorus irrespective of the nitrogen level, and E. pilularis did not survive high phosphorus or high nitrogen levels. There were differences between species in their growth responses to increasing levels of phosphorus and nitrogen. Dry weights of seedlings were greatest at P5N25 for B.serrata, at P5N250 for A.suaveolens, and at P5N250 for E.pilularis. Shoot phosphorus concentrations greater than 1% were directly associated with 'toxicity' and death of A.suaveolens seedlings only, and not of the other two species. The species differ in the weights and nutrient contents of their seeds, and this is discussed in relation to the different responses obtained. Growth of sclerophyll species on areas subject to disturbance (e.g. sand-mining) will be determined in large part by the levels of phosphorus and nitrogen applied and the rate at which nutrients are leached from the rooting zone.

Ten-Year Results of a Ponderosa Pine Progeny Test in the Black Hills

1986 ◽  
Vol 1 (3) ◽  
pp. 79-83 ◽  
Author(s):  
Wayne D. Shepperd ◽  
Sue E. McElderry
Keyword(s):  
Cluster Analysis ◽  
Ponderosa Pine ◽  
Black Hills ◽  
Progeny Test ◽  
Poor Survival ◽  
Analysis Technique ◽  
Survival And Growth ◽  
Cluster Analysis Technique ◽  
Growth Of Seedlings

Abstract Ten-year survival and growth of seedlings from 77 parent trees from throughout the Black Hills were compared, using a cluster-analysis technique. Five clusters were identified that account for most of the variability in survival and growth of the open-pollinated families. One cluster, containing 6 families, exhibited exceptional survival and growth. Another, containing 12 families, exhibited poor survival and growth. The performance of families in these two groups appears to be related to location and elevation of parent trees. West. J. Appl. For. 1:79-83, July 1986.

Gorillas and seed dispersal in the Lopé Reserve, Gabon. II: Survival and growth of seedlings

1999 ◽  
Vol 15 (1) ◽  
pp. 39-60 ◽  
Author(s):  
Benedict C. Voysey ◽  
Karen E McDonald ◽  
M. Elizabeth Rogers ◽  
Caroline E. G. Tutin ◽  
Richard J Parnell
Keyword(s):  
Seed Dispersal ◽  
Survival And Growth ◽  
Growth Of Seedlings

Differential impacts of plant interactions on herbaceous species recruitment: disentangling factors controlling emergence, survival and growth of seedlings

Oecologia ◽  
2009 ◽  
Vol 159 (4) ◽  
pp. 817-825 ◽  
Author(s):  
Adeline Fayolle ◽  
Cyrille Violle ◽  
Marie-Laure Navas
Keyword(s):  
Herbaceous Species ◽  
Plant Interactions ◽  
Species Recruitment ◽  
Survival And Growth ◽  
Growth Of Seedlings

Optimal Thinning of a Year-Class with Density-Dependent Growth

1986 ◽  
Vol 43 (4) ◽  
pp. 889-892 ◽  
Author(s):  
Rögnvaldur Hannesson
Keyword(s):  
Density Dependence ◽  
Optimal Harvesting ◽  
Early Date ◽  
Density Dependent ◽  
Moderate Density ◽  
Class A ◽  
Dependent Growth ◽  
The Impact ◽  
Harvesting Costs

I consider the impact of density-dependent growth on the optimal harvesting of a year-class of fish. In general, density dependence makes "thinning" of the year-class a desirable strategy. Moderate density dependence implies that thinning should be gradual, even in the case of zero harvesting costs where the optimal harvesting strategy would otherwise be instantaneous harvesting. Strong density dependence calls for an immediate thinning at an early date, in the case of zero harvesting costs.

scholarly journals Density-dependent effects on the survival and growth of the rodent stomach wormProtospirura muricolain laboratory mice

2004 ◽  
Vol 78 (2) ◽  
pp. 121-128 ◽  
Author(s):  
F.M. Lowrie ◽  
J.M. Behnke ◽  
C.J. Barnard
Keyword(s):  
Parasite Burden ◽  
Parasite Growth ◽  
Laboratory Mice ◽  
Density Dependent ◽  
Infective Larvae ◽  
Third Stage ◽  
Survival And Growth ◽  
Stomach Weight ◽  
Higher Doses ◽  
Dependent Processes

AbstractThe spirurid nematode,Protospirura muricola, is of intrinsic interest as a rodent model of gastric nematode infections. Since worm burdens can be very heavy in nature, density dependent processes may constrain parasite growth. Laboratory mice (BKW) were exposed to varying doses of infective larvae ofP. muricolain the range 5 to 40 third-stage larvae (L3), in four separate experiments in which progressively higher doses were utilized. All mice were culled 60 days after infection and a total of 518 worms (226 male and 292 female worms) was recovered, measured and weighed. Overall survival was 58.9%, but survival declined significantly with increasing dose by approximately 21% (from 66% at 5 L3 per mouse to 52% at 40 L3 per mouse). The length and weight of worms correlated positively in both sexes. Total worm biomass increased linearly with increasing numbers of worms. However, whilst the length and weight of male worms declined with increasing worm burden (8.4 and 24.6% respectively), female worms were less affected, only length showing a significant reduction with increasing parasite burden (16.0%). Therefore, increasing worm burdens impeded growth ofP. muricola, but reduction in length and weight were relatively small in relation to the overall size of this nematode. Increasing worm burdens were associated with loss of host weight and reduction in stomach weight and worm burdens in excess of 20 exerted a measurable cost to the host, which in the field, may be associated with loss of overall host fitness.

Ecological Studies of the Endangered Rutidosis leptorrhynchoides. II. Patterns of Seedling Emergence and Survival in a Native Grassland

1995 ◽  
Vol 43 (1) ◽  
pp. 13 ◽  
Author(s):  
JW Morgan
Keyword(s):  
Soil Moisture ◽  
Seedling Recruitment ◽  
Seedling Survival ◽  
Seedling Emergence ◽  
Moisture Stress ◽  
Seedling Mortality ◽  
Themeda Triandra ◽  
Established Plant ◽  
Survival And Growth ◽  
Growth Of Seedlings

The emergence, survival and growth of seedlings of the endangered Rutidosis leptorrhynchoides F.Muell. were followed in a Themeda triandra grassland during 1991 and 1992. The effect of summer irrigation on seedling survival was also investigated. Seedling emergence occurred in both years within 2 weeks of the 'autumn break' when soil moisture rose above 20%. Ninety percent of emergence was observed within 4 weeks of the onset of germination and 87% of seedlings were within 20 cm of an established plant. No emergence was observed after 8 weeks. Thirteen percent of the 1991 cohort survived for 14 months. Mortality of most seedlings (63%) was attributed to soil moisture stress in summer. Small seedlings (Ͱ4 3 leaves) were no more susceptible to drought than larger seedlings. Seventy two percent of the 1991 cohort produced four leaves before subsequently dying. In 1992, however, most early seedling mortality was amongst cotyledonary seedlings. No seedlings flowered in their first year. Above-ground growth was slow and by 14 months, 60% of surviving seedlings had seven or fewer live leaves. Irrigation in a year of below-average rainfall had no significant effect on the survival and growth of seedlings. This suggests that seedling recruitment is not restricted to climatically favourable years (i.e. is not episodic) but rather, is potentially on-going provided suitable microsites are available for seedling survival.

Effect of age and planting site on survival and growth of seedlings of Juniperus thurifera L.

2013 ◽  
Vol 39 (1) ◽  
pp. 109-114
Author(s):  
Luis F. Benito-Matías ◽  
Nieves Herrero Sierra ◽  
Jean-Louis Nicolas ◽  
Juan Luis Peñuelas Rubira
Keyword(s):  
Juniperus Thurifera ◽  
Survival And Growth ◽  
Effect Of Age ◽  
Growth Of Seedlings
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