scholarly journals Energy limitation or sensitive predators? Trophic and non‐trophic impacts of wastewater pollution on stream food webs

Ecology ◽  
2021 ◽  
Author(s):  
Jordi‐René Mor ◽  
Isabel Muñoz ◽  
Sergi Sabater ◽  
Lluís Zamora ◽  
Albert Ruhi
Keyword(s):  
Food Webs ◽  
Energy Limitation ◽  
Wastewater Pollution ◽  
Stream Food Webs

Functional significance of crayfish in stream food webs: roles of omnivory, substrate heterogeneity and sex

Oikos ◽  
2002 ◽  
Vol 98 (3) ◽  
pp. 512-522 ◽  
Author(s):  
Nisikawa Usio ◽  
Colin R. Townsend
Keyword(s):  
Food Webs ◽  
Functional Significance ◽  
Substrate Heterogeneity ◽  
Stream Food Webs

scholarly journals Flow intermittency influences the trophic base, but not the overall diversity of alpine stream food webs

Ecography ◽  
2019 ◽  
Vol 42 (9) ◽  
pp. 1523-1535 ◽  
Author(s):  
Andre R. Siebers ◽  
Amael Paillex ◽  
Christopher T. Robinson
Keyword(s):  
Food Webs ◽  
Alpine Stream ◽  
Flow Intermittency ◽  
Stream Food Webs

scholarly journals Pulse of dissolved organic matter alters reciprocal carbon subsidies between autotrophs and bacteria in stream food webs

2020 ◽  
Vol 90 (1) ◽  
Author(s):  
Benoît O. L. Demars ◽  
Nikolai Friberg ◽  
Barry Thornton
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Food Webs ◽  
Stream Food Webs

Impacts of aquatic invasive species and land use on stream food webs in Kaua’i, Hawai’i.

2014 ◽  
Vol 20 (3) ◽  
pp. 252 ◽  
Author(s):  
Megan Layhee ◽  
Michael P. Marchetti ◽  
Sudeep Chandra ◽  
Tag Engstrom ◽  
Daniel Pickard
Keyword(s):  
Invasive Species ◽  
Food Webs ◽  
Introduced Species ◽  
Human Disturbance ◽  
Habitat Degradation ◽  
Community Change ◽  
Ecological Communities ◽  
Native Populations ◽  
Niche Area ◽  
Stream Food Webs

Anthropogenic disturbance is restructuring ecosystems and changing interactions within ecological communities. On the Hawaiʼian Islands, habitat degradation is linked to the establishment of invasive species; and together these stressors may lead to declining native populations and changes in food webs. In this study we employed stable isotopes to examine the structure of multiple Hawaiʼian stream food webs with varying levels of these stressors to illustrate interactions between native and non-native organisms that may represent drivers of community change. Limahuli stream contains all five species of native Hawaiʼian gobies, has a small number of introduced species, and minimal human disturbance. ʻOpaekaʼa, Hul¯eʼia and Kapaʼa streams are more heavily invaded than Limahuli and have greater human influence. We found increased species richness, increased trophic diversity, and increased total niche area in the more heavily invaded stream food webs relative to Limahuli. We also found non-native predatory species inhabiting top trophic positions in the three more heavily invaded streams and isotope mixing model estimates suggest that several species of non-natives have overlapping prey sources with native gobies in these sites. Lastly, we found that native stream organisms were nearly absent in ʻOpaekaʼa stream which also had the highest percent urban development of the streams sampled. Our results suggest significant trophic changes have occurred as the result of introduced species and possibly related to increased human disturbance.

scholarly journals Anthropogenic land-use signals propagate through stream food webs in a California, USA, watershed

Limnologica ◽  
2014 ◽  
Vol 46 ◽  
pp. 124-130 ◽  
Author(s):  
Jonathan W. Moore ◽  
Timothy D. Lambert ◽  
Walter N. Heady ◽  
Susanna E. Honig ◽  
Ann-Marie K. Osterback ◽  
...  
Keyword(s):  
Land Use ◽  
Food Webs ◽  
Anthropogenic Land Use ◽  
Stream Food Webs

scholarly journals The biggest losers: habitat isolation deconstructs complex food webs from top to bottom

2019 ◽  
Vol 286 (1908) ◽  
pp. 20191177 ◽  
Author(s):  
Remo Ryser ◽  
Johanna Häussler ◽  
Markus Stark ◽  
Ulrich Brose ◽  
Björn C. Rall ◽  
...  
Keyword(s):  
Species Diversity ◽  
Habitat Fragmentation ◽  
Food Web ◽  
Food Webs ◽  
Spatial Dynamics ◽  
Trophic Levels ◽  
Habitat Isolation ◽  
Fragmented Landscapes ◽  
Energy Limitation ◽  
Species Specific

Habitat fragmentation threatens global biodiversity. To date, there is only limited understanding of how the different aspects of habitat fragmentation (habitat loss, number of fragments and isolation) affect species diversity within complex ecological networks such as food webs. Here, we present a dynamic and spatially explicit food web model which integrates complex food web dynamics at the local scale and species-specific dispersal dynamics at the landscape scale, allowing us to study the interplay of local and spatial processes in metacommunities. We here explore how the number of habitat patches, i.e. the number of fragments, and an increase of habitat isolation affect the species diversity patterns of complex food webs ( α -, β -, γ -diversities). We specifically test whether there is a trophic dependency in the effect of these two factors on species diversity. In our model, habitat isolation is the main driver causing species loss and diversity decline. Our results emphasize that large-bodied consumer species at high trophic positions go extinct faster than smaller species at lower trophic levels, despite being superior dispersers that connect fragmented landscapes better. We attribute the loss of top species to a combined effect of higher biomass loss during dispersal with increasing habitat isolation in general, and the associated energy limitation in highly fragmented landscapes, preventing higher trophic levels to persist. To maintain trophic-complex and species-rich communities calls for effective conservation planning which considers the interdependence of trophic and spatial dynamics as well as the spatial context of a landscape and its energy availability.

Methylmercury Bioaccumulation in Stream Food Webs Declines with Increasing Primary Production

2015 ◽  
Vol 49 (13) ◽  
pp. 7762-7769 ◽  
Author(s):  
David M. Walters ◽  
David F. Raikow ◽  
Chad R. Hammerschmidt ◽  
Molly G. Mehling ◽  
Amanda Kovach ◽  
...  
Keyword(s):  
Primary Production ◽  
Food Webs ◽  
Methylmercury Bioaccumulation ◽  
Stream Food Webs

scholarly journals The importance of high-quality algal food sources in stream food webs - current status and future perspectives

2016 ◽  
Vol 61 (6) ◽  
pp. 815-831 ◽  
Author(s):  
Fen Guo ◽  
Martin J. Kainz ◽  
Fran Sheldon ◽  
Stuart E. Bunn
Keyword(s):  
Food Webs ◽  
Food Sources ◽  
Current Status ◽  
Future Perspectives ◽  
High Quality ◽  
Algal Food ◽  
Stream Food Webs

Shifts in the trophic base of intermittent stream food webs

Hydrobiologia ◽  
2009 ◽  
Vol 635 (1) ◽  
pp. 263-277 ◽  
Author(s):  
Matthew P. Dekar ◽  
Daniel D. Magoulick ◽  
Gary R. Huxel
Keyword(s):  
Food Webs ◽  
Intermittent Stream ◽  
Stream Food Webs

Connectance in stream food webs

2002 ◽  
Vol 71 (6) ◽  
pp. 1056-1062 ◽  
Author(s):  
Jenny M. Schmid-Araya ◽  
Peter E. Schmid ◽  
Anne Robertson ◽  
Julie Winterbottom ◽  
Charlotte Gjerlov ◽  
...  
Keyword(s):  
Food Webs ◽  
Stream Food Webs
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