scholarly journals Long‐term variability and density dependence in Hudson River Dreissena populations

2019 ◽  
Vol 65 (3) ◽  
pp. 474-489 ◽  
Author(s):  
David L. Strayer ◽  
David T. Fischer ◽  
Stephen K. Hamilton ◽  
Heather M. Malcom ◽  
Michael L. Pace ◽  
...  
Keyword(s):  
Density Dependence ◽  
Hudson River

scholarly journals Long-term persistence, density dependence and effects of climate change on rosyside dace (Cyprinidae)

2016 ◽  
Vol 61 (6) ◽  
pp. 832-847 ◽  
Author(s):  
Gary D. Grossman ◽  
Gary Sundin ◽  
Robert E. Ratajczak
Keyword(s):  
Climate Change ◽  
Density Dependence

Interannual and long-term variation in the nearshore fish community of the mesohaline Hudson River estuary

Estuaries ◽  
2004 ◽  
Vol 27 (4) ◽  
pp. 659-669 ◽  
Author(s):  
Thomas P. Hurst ◽  
Kim A. McKown ◽  
David O. Conover
Keyword(s):  
Fish Community ◽  
River Estuary ◽  
Hudson River ◽  
Hudson River Estuary ◽  
Term Variation

Herbivores as drivers of negative density dependence in tropical forest saplings

Science ◽  
2019 ◽  
Vol 363 (6432) ◽  
pp. 1213-1216 ◽  
Author(s):  
Dale L. Forrister ◽  
María-José Endara ◽  
Gordon C. Younkin ◽  
Phyllis D. Coley ◽  
Thomas A. Kursar
Keyword(s):  
Density Dependence ◽  
Plant Performance ◽  
Ecological Traits ◽  
Growth And Survival ◽  
Local Diversity ◽  
Related Plant ◽  
Negative Density Dependence ◽  
Herbivore Pressure ◽  
Herbivore Communities

Ecological theory predicts that the high local diversity observed in tropical forests is maintained by negative density–dependent interactions within and between closely related plant species. By using long-term data on tree growth and survival for coexisting Inga (Fabaceae, Mimosoideae) congeners, we tested two mechanisms thought to underlie negative density dependence (NDD): competition for resources and attack by herbivores. We quantified the similarity of neighbors in terms of key ecological traits that mediate these interactions, as well as the similarity of herbivore communities. We show that phytochemical similarity and shared herbivore communities are associated with decreased growth and survival at the sapling stage, a key bottleneck in the life cycle of tropical trees. None of the traits associated with resource acquisition affect plant performance, indicating that competition between neighbors may not shape local tree diversity. These results suggest that herbivore pressure is the primary mechanism driving NDD at the sapling stage.

Experimental evidence for density-dependence of home-range size in roe deer ( Capreolus capreolus L.): a comparison of two long-term studies

Oecologia ◽  
2004 ◽  
Vol 139 (3) ◽  
pp. 478-485 ◽  
Author(s):  
P. Kjellander ◽  
A. J. M. Hewison ◽  
O. Liberg ◽  
J.-M. Angibault ◽  
E. Bideau ◽  
...  
Keyword(s):  
Home Range ◽  
Density Dependence ◽  
Experimental Evidence ◽  
Roe Deer ◽  
Capreolus Capreolus ◽  
Home Range Size ◽  
Range Size ◽  
Long Term Studies

scholarly journals Genomic analyses of Northern snakehead (Channa argus) populations in North America

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4581 ◽  
Author(s):  
Carlee A. Resh ◽  
Matthew P. Galaska ◽  
Andrew R. Mahon
Keyword(s):  
United States ◽  
Invasive Species ◽  
River Basin ◽  
Hudson River ◽  
The United States ◽  
Aquatic Invasive Species ◽  
Potomac River ◽  
Potomac River Basin ◽  
Channa Argus

Background The introduction of northern snakehead (Channa argus; Anabantiformes: Channidae) and their subsequent expansion is one of many problematic biological invasions in the United States. This harmful aquatic invasive species has become established in various parts of the eastern United States, including the Potomac River basin, and has recently become established in the Mississippi River basin in Arkansas. Effective management of C. argus and prevention of its further spread depends upon knowledge of current population structure in the United States. Methods Novel methods for invasive species using whole genomic scans provide unprecedented levels of data, which are able to investigate fine scale differences between and within populations of organisms. In this study, we utilize 2b-RAD genomic sequencing to recover 1,007 single-nucleotide polymorphism (SNP) loci from genomic DNA extracted from 165 C. argus individuals: 147 individuals sampled along the East Coast of the United States and 18 individuals sampled throughout Arkansas. Results Analysis of those SNP loci help to resolve existing population structure and recover five genetically distinct populations of C. argus in the United States. Additionally, information from the SNP loci enable us to begin to calculate the long-term effective population size ranges of this harmful aquatic invasive species. We estimate long-term Ne to be 1,840,000–18,400,000 for the Upper Hudson River basin, 4,537,500–45,375,000 for the Lower Hudson River basin, 3,422,500–34,225,000 for the Potomac River basin, 2,715,000–7,150,000 for Philadelphia, and 2,580,000–25,800,000 for Arkansas populations. Discussion and Conclusions This work provides evidence for the presence of more genetic populations than previously estimated and estimates population size, showing the invasive potential of C. argus in the United States. The valuable information gained from this study will allow effective management of the existing populations to avoid expansion and possibly enable future eradication efforts.

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