Seasonal Fecundity and Source-Sink Status of Shrub-Nesting Birds in a Southwestern Riparian Corridor

2011 ◽  
Vol 123 (1) ◽  
pp. 48-58 ◽  
Author(s):  
L. Arriana Brand ◽  
Barry R. Noon
Keyword(s):  
Source Sink ◽  
Riparian Corridor ◽  
Seasonal Fecundity

scholarly journals Reproductive Success of Wood Thrushes in Forest Fragments in Northern Indiana

The Auk ◽  
2000 ◽  
Vol 117 (1) ◽  
pp. 194-204 ◽  
Author(s):  
Peter T. Fauth
Keyword(s):  
Reproductive Success ◽  
Nest Predation ◽  
Forest Edge ◽  
Negative Influence ◽  
Forest Area ◽  
Forest Fragments ◽  
Regional Demography ◽  
Source Sink ◽  
Wood Thrushes ◽  
Seasonal Fecundity

AbstractI monitored 278 Wood Thrush (Hylocichla mustelina) nests in 14 forest fragments (range 7 to 500 ha) in northern Indiana to explore patterns of brood parasitism by Brown-headed Cowbirds (Molothrus ater), nest predation, and reproductive success. Density of thrushes was negatively related to area of forest fragments. Cowbirds were common throughout the landscape, but I found no relationship between their abundance and forest area. Overall, 90% of the thrush nests were parasitized by cowbirds (x̄ = 2.4 cowbird eggs per nest). The number of cowbird eggs per thrush nest was not related to forest area, abundance of host species, or distance to a forest edge but was positively related to thrush abundance. Nest predation rates averaged 58% and were lower than those reported in much of neighboring Illinois but also were unrelated to forest area and distance to a forest edge. The combination of cowbird parasitism and nest predation resulted in relatively low reproductive success (x̄ = 0.6 thrush fledglings per nesting attempt). I estimated that Wood Thrushes in northern Indiana made an average of three nesting attempts per breeding season (based on 17 color-marked females) and had relatively low seasonal fecundity (x̄ = 0.9 female fledglings per adult female per season). Nonetheless, considerable annual variation in seasonal fecundity suggested that some sites exceeded the source-sink threshold in some years. Regardless, the overall landscape appeared to be part of a regional sink for Wood Thrushes, although its negative influence on regional demography was not as severe as elsewhere in the midwestern United States. The poor demographic balance in much of the agriculturally dominated Midwest suggests that conservation efforts for Wood Thrushes and other Nearctic-Neotropical migrants should be directed at preserving and enhancing possible source habitats in regions where parasitism by cowbirds and nest predation are reduced.

Effects of Different Levels of Boron Fertilizer on Alfalfa Photosynthesis and Source-Sink Translocation of Soluble Carbohydrate in Alfalfa

2010 ◽  
Vol 36 (4) ◽  
pp. 665-672 ◽  
Author(s):  
Yu-Zheng ZONG ◽  
Wen-Yue WANG ◽  
Qing-Fang HAN ◽  
Rui-Xia DING ◽  
Zhi-Kuan JIA ◽  
...  
Keyword(s):  
Soluble Carbohydrate ◽  
Source Sink ◽  
Different Levels

Effects of 5-aminolevulinic acid and ethephon compound on carbon balance of source-sink of spring maize in Northeast China

2020 ◽  
Vol 46 (7) ◽  
pp. 1063-1075
Author(s):  
Peng YAN ◽  
Yan-Li XU ◽  
Qi WANG ◽  
Feng-Lu ZHANG ◽  
Rui-Jie LI ◽  
...  
Keyword(s):  
Northeast China ◽  
Carbon Balance ◽  
Aminolevulinic Acid ◽  
Spring Maize ◽  
Source Sink
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