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 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

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

Arctic sea-ice decline impacts on primary production

2020 ◽  
Author(s):  
Letizia Tedesco ◽  
Eva Leu ◽  
Marc Macias-Fauria ◽  
Christopher J. Mundy ◽  
Dirk Notz ◽  
...  
Keyword(s):  
Sea Ice ◽  
Primary Production ◽  
Food Webs ◽  
Current Knowledge ◽  
Human Life ◽  
Quantitative Model ◽  
Arctic Sea Ice ◽  
Ice Dynamics ◽  
Sea Ice Decline ◽  
Marine Primary Production

<p>Arctic food webs are short and relatively species poor, rendering them vulnerable to changes or perturbations at any individual trophic level. High-latitude warming represents one major source of potential perturbation to Arctic marine and terrestrial food webs, which may experience cascading effects derived from changes in primary production through so-called “bottom-up” effects. We synthesize current knowledge on i) the changing Arctic marine icescape, ii) the drivers of biological changes for Arctic marine primary production, iii) the different pulses of Arctic marine primary production, iv) patterns of marine trophic and phenological changes, and iv) some mechanisms through which sea-ice dynamics ostensibly influence terrestrial primary productivity. We deliver a set of predictions for key productivity indicators, propose a semi-quantitative model of the expected future changes in primary production in the ice-covered Arctic Ocean, and close with an overview of the challenges ahead for reaching a holistic and comprehensive understanding of the ecosystem dynamical consequences and associated impacts on human life of warming-related sea-ice decline.</p>

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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