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1. Adaptation in Clarkia, Section Myxocarpa

Author:
Small, Ernest
Source:
Ecology 1972 v.53 no.5 pp. 808-818
ISSN:
0012-9658
Subject:
Clarkia; annuals; diploidy; drought; gardens; habitats; leaves; photosynthesis; phylogeny; seeds; soil; temperature; transpiration
Abstract:
... The adaptive relationships of the eight diploid taxa of Clarkia, section Myxocarpa, are documented. The phylogeny of these taxa is well understood, allowing precise comparisons of the state of adaptiveness between related taxa in relationship to differences in their habitats. The habitats of these taxa comprise distinctive combinations of precipitation, temperature, and soil characteristics. Diffe ...
DOI:
10.2307/1934296

2. Germinable Alkali Sacation Seed Content of Soils in the Rio Puerco Basin, West Central New Mexico

Author:
Knipe, O. D.; Springfield, H. W.
Source:
Ecology 1972 v.53 no.5 pp. 965-968
ISSN:
0012-9658
Subject:
Sporobolus airoides; animals; basins; insects; seedlings; seeds; soil; soil sampling; wind; New Mexico
Abstract:
... Barren sites are interspersed through native stands of alkali sacaton (Sporbolus airoides Torr.) in west central New Mexico. To determine if these sites remain bare because of lack of viable seeds, soil samples were collected three times each year for three years, and emerging sacaton seedlings were counted. Fewer germinable seeds were found in soil from barren sits than in soil from within stands ...
DOI:
10.2307/1934317

3. Predation on Scheelea Palm Seeds by Bruchid Beetles: Seed Density and Distance from the Parent Palm

Author:
Wilson, Don E.; Janzen, Daniel H.
Source:
Ecology 1972 v.53 no.5 pp. 954-959
ISSN:
0012-9658
Subject:
Coleoptera; cleaning; endocarp; forests; fruiting; larvae; natural history; nuts; oviposition; predation; probability; seeds; survival rate; Costa Rica
Abstract:
... In a test of the following hypotheses, the first was rejected and the second accepted. Rejected: (1) The farther a freshly cleaned [pile of] palm nut[s] (endocarp) is placed from a fruiting parent, the lower will be the probability of the nut[s'] being found by a bruchid. Accepted: (2) The larger the pile of freshly cleaned nuts at a site where there is no parent the more likely that it will be fo ...
DOI:
10.2307/1934315