Next Article in Journal
The Effect of Moisture Content on the Tar Characteristic of Wood Pellet Feedstock in a Downdraft Gasifier
Next Article in Special Issue
Effects of di-(2-ethylhexyl) phthalate on Transcriptional Expression of Cellular Protection-Related HSP60 and HSP67B2 Genes in the Mud Crab Macrophthalmus japonicus
Previous Article in Journal
Design of a High-Performance Digital Slit-Lamp Microscope with Five-Switched Zoom
Previous Article in Special Issue
Pretreatment Method for DNA Barcoding to Analyze Gut Contents of Rotifers
Open AccessArticle

Changing Isotopic Food Webs of Two Economically Important Fish in Mediterranean Coastal Lakes with Different Trophic Status

1
Department of Environmental Biology, Sapienza University of Rome, via dei Sardi 70, 00185 Rome, Italy
2
CoNISMa, piazzale Flaminio 9, 00196 Rome, Italy
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(8), 2756; https://doi.org/10.3390/app10082756
Received: 22 February 2020 / Revised: 12 April 2020 / Accepted: 13 April 2020 / Published: 16 April 2020
(This article belongs to the Special Issue Food Chains and Food Webs in Aquatic Ecosystems)
Transitional waters are highly productive ecosystems, providing essential goods and services to the biosphere and human population. Human influence in coastal areas exposes these ecosystems to continuous internal and external disturbance. Nitrogen-loads can affect the composition of the resident community and the trophic relationships between and within species, including fish. Based on carbon (δ13C) and nitrogen (δ15N) stable isotope analyses of individuals, we explored the feeding behaviour of two ecologically and economically important omnivorous fish, the eel Anguilla anguilla and the seabream Diplodus annularis, in three neighbouring lakes characterised by different trophic conditions. We found that A. anguilla showed greater generalism in the eutrophic lake due to the increased contribution of basal resources and invertebrates to its diet. By contrast, the diet of D. annularis, which was mainly based on invertebrate species, became more specialised, focusing especially on polychaetes. Our results suggest that changes in macroinvertebrate and fish community composition, coupled with anthropogenic pressure, affect the trophic strategies of high trophic level consumers such as A. anguilla and D. annularis. Detailed food web descriptions based on the feeding choices of isotopic trophospecies (here Isotopic Trophic Units, ITUs) enable identification of the prey taxa crucial for the persistence of omnivorous fish stocks, thus providing useful information for their management and habitat conservation. View Full-Text
Keywords: food webs; Mediterranean coastal lakes; nitrogen pollution; stable isotopes; trophic relationships; Anguilla anguilla; Diplodus annularis food webs; Mediterranean coastal lakes; nitrogen pollution; stable isotopes; trophic relationships; Anguilla anguilla; Diplodus annularis
Show Figures

Figure 1

MDPI and ACS Style

Sporta Caputi, S.; Careddu, G.; Calizza, E.; Fiorentino, F.; Maccapan, D.; Rossi, L.; Costantini, M.L. Changing Isotopic Food Webs of Two Economically Important Fish in Mediterranean Coastal Lakes with Different Trophic Status. Appl. Sci. 2020, 10, 2756.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop