Food Partitioning between the Amphipods Echinogammarus ischnus, Gammarus fasciatus, and Hyalella azteca as Revealed by Stable Isotopes

2005 ◽  
Vol 31 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Helene Limén ◽  
Colin D.A. van Overdijk ◽  
Hugh J. MacIsaac
Keyword(s):  
Stable Isotopes ◽  
Hyalella Azteca ◽  
Gammarus Fasciatus ◽  
Echinogammarus Ischnus ◽  
Food Partitioning

Microhabitat selection by the invasive amphipod Echinogammarus ischnus and native Gammarus fasciatus in laboratory experiments and in Lake Erie

2003 ◽  
Vol 48 (4) ◽  
pp. 567-578 ◽  
Author(s):  
Colin D. A. Van Overdijk ◽  
Igor A. Grigorovich ◽  
Tracy Mabee ◽  
William J. Ray ◽  
Jan J. H. Ciborowski ◽  
...  
Keyword(s):  
Lake Erie ◽  
Laboratory Experiments ◽  
Microhabitat Selection ◽  
Gammarus Fasciatus ◽  
Echinogammarus Ischnus ◽  
Invasive Amphipod

Physical factors affecting the relative abundance of native and invasive amphipods in the St. Lawrence River

2004 ◽  
Vol 82 (12) ◽  
pp. 1886-1893 ◽  
Author(s):  
M E Palmer ◽  
A Ricciardi
Keyword(s):  
Current Velocity ◽  
Habitat Heterogeneity ◽  
Physical Factors ◽  
Factors Affecting ◽  
The North ◽  
Gammarus Fasciatus ◽  
Site Survey ◽  
Echinogammarus Ischnus ◽  
Invasive Amphipods ◽  
St Lawrence River

The Ponto-Caspian amphipod Echinogammarus ischnus (Stebbing, 1899) is reportedly replacing the North American amphipod Gammarus fasciatus Say, 1818, in the lower Great Lakes, but the two species appear to coexist in the upper St. Lawrence River several years after invasion by E. ischnus. A multi-site survey in the river between Lake Ontario and Montreal (Quebec) found that E. ischnus and G. fasciatus respond differently to substrate characteristics, water chemistry variables, and current velocity. Both species increase in abundance in the presence of dreissenid mussels. However, E. ischnus density is positively correlated with current velocity and an increasing proportion of gravel-sized sediment, while G. fasciatus density is positively correlated with benthic filamentous algal (Cladophora spp.) biomass, macrophyte biomass, and pH. Habitat heterogeneity within the river may be promoting the coexistence of native and exotic amphipods by allowing them to segregate along physicochemical gradients.

Seasonal study of the fauna of bedrock substrates in the wave zones of lakes Huron and Erie

1978 ◽  
Vol 56 (1) ◽  
pp. 48-54 ◽  
Author(s):  
D. R. Barton ◽  
H. B. N. Hynes
Keyword(s):  
Lake Erie ◽  
Hyalella Azteca ◽  
Benthic Macrofauna ◽  
Lake Huron ◽  
Insect Species ◽  
Wave Zone ◽  
Gammarus Fasciatus ◽  
Seasonal Study ◽  
The Common ◽  
A Site

Quantitative samples of the benthic macrofauna inhabiting bedrock substrates in the wave zone (0- to 2-m depth) at a site on Lake Huron and one on Lake Erie were collected in each season during 1975 and early 1976. The turnover of species between sampling visits was greatest in summer and at depths less than 0.5 m. The fauna at the Lake Huron site was dominated numerically by Hyalella azteca (Amphipoda) and larvae of Stenelmis spp. (Coleoptera: El-midae). The density of the fauna appeared to be greatest in winter. The fauna at the Lake Erie site was dominated by Gammarus fasciatus (Amphipoda), whose populations were largest in summer and smallest in winter, thus corresponding to the abundance of Cladophora in the wave zone. None of the common insect species underwent diapause as larvae at either site.

Disentangling the role of shared ancestry and the environment on leaf stable isotopes

2019 ◽  
Author(s):  
Marko J. Spasojevic ◽  
Sören Weber1
Keyword(s):  
Stable Isotopes ◽  
Environmental Conditions ◽  
Evolutionary History ◽  
Environmental Control ◽  
Phylogenetic Signal ◽  
Individual Species ◽  
Habitat Types ◽  
Δ13c And Δ15n ◽  
Environmental Controls ◽  
Shared Ancestry

Stable carbon (C) and nitrogen (N) isotopes in plants are important indicators of plant water use efficiency and N acquisition strategies. While often regarded as being under environmental control, there is growing evidence that evolutionary history may also shape variation in stable isotope ratios (δ13C and δ15N) among plant species. Here we examined patterns of foliar δ13C and δ15N in alpine tundra for 59 species in 20 plant families. To assess the importance of environmental controls and evolutionary history, we examined if average δ13C and δ15N predictably differed among habitat types, if individual species exhibited intraspecific trait variation (ITV) in δ13C and δ15N, and if there were a significant phylogenetic signal in δ13C and δ15N. We found that variation among habitat types in both δ13C and δ15N mirrored well-known patterns of water and nitrogen limitation. Conversely, we also found that 40% of species exhibited no ITV in δ13C and 35% of species exhibited no ITV in δ15N, suggesting that some species are under stronger evolutionary control. However, we only found a modest signal of phylogenetic conservatism in δ13C and no phylogenetic signal in δ15N suggesting that shared ancestry is a weaker driver of tundra wide variation in stable isotopes. Together, our results suggest that both evolutionary history and local environmental conditions play a role in determining variation in δ13C and δ15N and that considering both factors can help with interpreting isotope patterns in nature and with predicting which species may be able to respond to rapidly changing environmental conditions.

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