Reproductive environment of the decreasing Indian river shad in Asian inland waters: disentangling the climate change and indiscriminative fishing threats
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12520%2F21%3A43902528" target="_blank" >RIV/60076658:12520/21:43902528 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1007/s11356-021-12852-7" target="_blank" >https://doi.org/10.1007/s11356-021-12852-7</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s11356-021-12852-7" target="_blank" >10.1007/s11356-021-12852-7</a>
Alternative languages
Result language
angličtina
Original language name
Reproductive environment of the decreasing Indian river shad in Asian inland waters: disentangling the climate change and indiscriminative fishing threats
Original language description
The regional climate has significantly warmed with erratically declining annual rainfall and intensified downpour within a narrower span of monsoon months, which led to an increased trophic state (approximate to algae) in most inland waters. Freshwater clupeids vitally control the aquatic food chain by grazing on algae. Despite increasing food availability, IUCN Red List (R) revealed 16 freshwater clupeids with a decreasing population trend. We investigated one such species' reproductive dependencies, Gudusia chapra (Indian river shad), in the lower Gangetic drainage (India) under a mixed context of climate change and overfishing. Monthly rainfall (>= 60-100 mm) and water temperature (>= 31-32 degrees C) are key breeding cues for females. The regional climate seems inclined to fulfill these through the significant part of the breeding season, and indeed the species has maintained consistent breeding phenology over 20 years. Other breeding thresholds relevant to fishing include size at first maturity (>= 6.8 cm; reduced by similar to 25-36%) and pre-spawning girth (Girth(spawn50) >= 7 cm; first record). Girth(spawn50) is a proxy of the minimum mesh size requirement of fishing nets to allow safe passage of "gravid" females (+ 22% bulged abdomen) and breed. The operational fishing nets (3-10 cm mesh) probably have been indulged in indiscriminative fishing of gravid females for generations. Under a favorably changing climate and food availability, existing evidence suggests a fishery-induced evolution in regional females (to circumvent such mesh sizes) through earlier maturation/puberty at smaller sizes. It could be an early warning sign of population collapse (smaller females -> lessening fecundity -> fewer offspring). Overfishing seemed to be a bigger threat than climate change.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
40103 - Fishery
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Environmental Science and Pollution Research
ISSN
0944-1344
e-ISSN
1614-7499
Volume of the periodical
28
Issue of the periodical within the volume
neuveden
Country of publishing house
DE - GERMANY
Number of pages
12
Pages from-to
30207-30218
UT code for WoS article
000617854700002
EID of the result in the Scopus database
2-s2.0-85100964779