scholarly journals A new composite abundance metric detects stream fish declines and community homogenization during six decades of invasions

2021 ◽  
Author(s):  
Logan J. Sleezer ◽  
Paul L. Angermeier ◽  
Emmanuel A. Frimpong ◽  
Bryan L. Brown
Keyword(s):  
Stream Fish

Chronosequence of morphological change in a stream fish following impoundment

2021 ◽  
Author(s):  
Travis C. Haas ◽  
Graham Derryberry ◽  
David C. Heins ◽  
Michael J. Blum
Keyword(s):  
Morphological Change ◽  
Stream Fish

Scanning electron microscopy of the operculum of Garra lamta (Hamilton) (Cyprinidae:Cypriniformes), an Indian hill stream fish

2010 ◽  
Vol 58 (3) ◽  
pp. 182 ◽  
Author(s):  
Swati Mittal ◽  
Usha Kumari ◽  
Pinky Tripathi ◽  
Ajay Kumar Mittal
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Epithelial Cells ◽  
Goblet Cells ◽  
Stream Fish ◽  
Male And Female ◽  
Fish Breeding ◽  
Inner Surface ◽  
Garra Lamta ◽  
Scanning Electron

The surface architecture of the epidermis on the outer surface of the operculum (OE) and the epithelium on the inner surface of the operculum (EISO) of Garra lamta was examined by scanning electron microscopy. The surface appeared smooth on the OE and wavy on the EISO. A wavy epithelium is considered to facilitate an increase in its stretchability, during the expansion of the branchial chamber. The OE and the EISO were covered by a mosaic pavement of epithelial cells with characteristic patterns of microridges and microbridges. Interspersed between the epithelial cells were mucous goblet cell pores, which were not significantly different in number in the OE and the EISO. Nevertheless, their surface area in the EISO was significantly higher than in the OE. This could be an adaptation to secrete higher amounts of mucus on the EISO for keeping the branchial chamber lining clean, avoiding clogging, the increased slipperiness reducing friction from water flow and increased efficiency in protecting against microbial attachments. Rounded bulges on the OE and the EISO were associated with mucous goblet cells. The absence of the taste buds in the EISO, in contrast to the OE, suggests that their function in the branchial chamber may not be of much significance in this fish. Breeding tubercles on the OE are believed to facilitate better contact between the male and female during breeding.

scholarly journals Land cover, riparian zones and instream habitat influence stream fish assemblages in the eastern Amazon

2018 ◽  
Vol 28 (2) ◽  
pp. 317-329 ◽  
Author(s):  
Luciano F. A. Montag ◽  
Kirk O. Winemiller ◽  
Friedrich W. Keppeler ◽  
Híngara Leão ◽  
Naraiana L. Benone ◽  
...  
Keyword(s):  
Land Cover ◽  
Fish Assemblages ◽  
Riparian Zones ◽  
Stream Fish ◽  
Stream Fish Assemblages

scholarly journals Experimental evidence that parasites drive eco-evolutionary feedbacks

2017 ◽  
Vol 114 (14) ◽  
pp. 3678-3683 ◽  
Author(s):  
Franziska S. Brunner ◽  
Jaime M. Anaya-Rojas ◽  
Blake Matthews ◽  
Christophe Eizaguirre
Keyword(s):  
Gene Expression ◽  
Experimental Evidence ◽  
Body Condition ◽  
Host Resistance ◽  
Expression Profiles ◽  
Juvenile Fish ◽  
Gene Expression Profiles ◽  
Zooplankton Community ◽  
Stream Fish ◽  
Zooplankton Community Structure

Host resistance to parasites is a rapidly evolving trait that can influence how hosts modify ecosystems. Eco-evolutionary feedbacks may develop if the ecosystem effects of host resistance influence selection on subsequent host generations. In a mesocosm experiment, using a recently diverged (<100 generations) pair of lake and stream three-spined sticklebacks, we tested how experimental exposure to a common fish parasite (Gyrodactylus spp.) affects interactions between hosts and their ecosystems in two environmental conditions (low and high nutrients). In both environments, we found that stream sticklebacks were more resistant to Gyrodactylus and had different gene expression profiles than lake sticklebacks. This differential infection led to contrasting effects of sticklebacks on a broad range of ecosystem properties, including zooplankton community structure and nutrient cycling. These ecosystem modifications affected the survival, body condition, and gene expression profiles of a subsequent fish generation. In particular, lake juvenile fish suffered increased mortality in ecosystems previously modified by lake adults, whereas stream fish showed decreased body condition in stream fish-modified ecosystems. Parasites reinforced selection against lake juveniles in lake fish-modified ecosystems, but only under oligotrophic conditions. Overall, our results highlight the overlapping timescales and the interplay of host–parasite and host–ecosystem interactions. We provide experimental evidence that parasites influence host-mediated effects on ecosystems and, thereby, change the likelihood and strength of eco-evolutionary feedbacks.

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