scholarly journals Experimental evidence that predator range expansion modifies alpine stream community structure

2015 ◽  
Vol 34 (1) ◽  
pp. 66-80 ◽  
Author(s):  
K. Khamis ◽  
L. E. Brown ◽  
D. M. Hannah ◽  
A. M. Milner
Ecology ◽  
1980 ◽  
Vol 61 (6) ◽  
pp. 1283-1290 ◽  
Author(s):  
Barbara L. Peckarsky ◽  
Stanley I. Dodson

1988 ◽  
Vol 45 (12) ◽  
pp. 2168-2181 ◽  
Author(s):  
J. M. King ◽  
J. A. Day ◽  
P. R. Hurly ◽  
M-P. Henshall-Howard ◽  
B. R. Davies

In a study of a second-order southern African stream, complementary classification and multidimensional scaling (MDS) techniques revealed longitudinal changes in macroinvertebrate community structure, but no temporal changes. Stepwise discriminant analysis and multiple linear regression were used to identify environmental variables correlated with the community changes but produced conflicting results depending on the information used, possibly because of strong correlations between some of the variables. The MDS plot of biotic samples illustrated that potassium levels correlated most strongly with community distribution. Because of the large number of variables now shown worldwide to correlate with faunal distributions, we suggest ways to choose the variables to suit the kind of study to be undertaken. Attempts to assign the invertebrates to functional feeding groups (FFGs) were unsatisfactory as the relevant categories are poorly defined and often inadequate for classifying the fauna. We suggest that until these categories are more clearly defined, and more uniformly applied, concepts relating to FFGs cannot be tested satisfactorily. The stream community in Langrivier is more similar to communities found in two other mediterranean ecosystems than to those in other southern African rivers, probably because of the greater predictability of flow in the former.


2020 ◽  
pp. 1-10
Author(s):  
Atta Rasool ◽  
Salar Ali ◽  
Waqar Ali ◽  
Gaber E. Eldesoky ◽  
Muhammad Shafeeque ◽  
...  

Oikos ◽  
2008 ◽  
Vol 117 (5) ◽  
pp. 683-692 ◽  
Author(s):  
Guy Woodward ◽  
Georgia Papantoniou ◽  
François Edwards ◽  
Rasmus B. Lauridsen

Diversity ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 208 ◽  
Author(s):  
Julie E. Walker ◽  
Christine Angelini ◽  
Ilgar Safak ◽  
Andrew H. Altieri ◽  
Todd Z. Osborne

Decreasing frequency of freeze events due to climate change is enabling the poleward range expansion of mangroves. As these tropical trees expand poleward, they are replacing herbaceous saltmarsh vegetation. Mangroves and saltmarsh vegetation are ecosystem engineers that are typically viewed as having similar ecosystem functions. However, few studies have investigated whether predation regimes, community structure, and ecosystem functions are shifting at the saltmarsh-mangrove ecotone. In this study, we manipulated predator access to marsh and mangrove creekside habitats to test their role in mediating vegetation and invertebrate structure and stability in a two-year experiment. We also conducted a survey to evaluate how shifting vegetation is modifying structural complexity, invertebrate communities, and ecosystem functioning at the ecotone. Excluding larger (> 2 cm diameter) predators did not affect vegetation or invertebrate structure or stability in either saltmarsh or mangrove habitats. The survey revealed that the two habitat types consistently differ in structural metrics, including vegetation height, inter-stem distance, and density, yet they support similar invertebrate and algal communities, soil properties, and predation rates. We conclude that although mangrove range expansion immediately modifies habitat structural properties, it is not altering larger predator consumptive effects, community stability, community composition, or some other ecosystem functions and properties at the ecotone.


2019 ◽  
Vol 65 (3) ◽  
pp. 524-539 ◽  
Author(s):  
Alberto Scotti ◽  
Leopold Füreder ◽  
Thomas Marsoner ◽  
Ulrike Tappeiner ◽  
Agnieszka E. Stawinoga ◽  
...  

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