Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/5431
Title: The influence of environmental factors on the population dynamics, reproductive biology and productivity of Echinogammarus marinus Leach (Amphipoda, Gammaridae) in the Mondego estuary (Portugal)
Authors: Maranhão, Paulo 
Bengala, Nuno 
Pardal, Miguel 
Marques, João Carlos 
Keywords: Echinogammarus marinus; environmental factors; population dynamics; productivity; reproductive biology
Issue Date: 2001
Citation: Acta Oecologica. 22:3 (2001) 139-152
Abstract: The population density of Echinogammarus marinusin the Mondego estuary changed throughout the year, with a maximum during spring. The lowest densities were found in the north arm of the estuary, and the highest ones in the inner areas of the south arm. Higher densities appeared associated with the presence of muddy deposits under Fucus vesiculosus (Phaeophyta) and also with the presence of green macroalgae biomass over the sediments. Females were morphologically recognisable at smaller sizes than males, but males became larger than females. Fecundity increases with the size of females and is influenced by temperature and salinity. Sexual activity and recruitment take place continuously throughout the year, although it almost ceases by the end of winter. Present results are in opposition to the hypothesis of discontinuous recruitment presented in a previous study. Productivity (ash free dry weight- AFDW) was estimated at 1.74 to 2.45 g·m-2·year-1 in the north arm of the estuary corresponding to an annual turnover ratio () of 4.14 to 6.18. In the south arm, productivity was estimated at 1.96 to 2.74 g AFDW·m-2·year-1 in the middle section ( of 4.68 to 6.56), and at 3.85 to 5.38 g AFDW·m-2·year-1 in the innermost sampling area ( of 4.54 to 6.36). Differences in productivity appeared to depend only on population density, while annual ratios were similar over the estuary. Evidence was found that several features of E. marinus population dynamics were dependent on environmental factors resulting from the particular estuary hydraulic regime.
URI: https://hdl.handle.net/10316/5431
DOI: 10.1016/S1146-609X(01)01112-2
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais

Files in This Item:
File Description SizeFormat
file5574152a7d3f461e93e89a5f29a5c3c7.pdf532.4 kBAdobe PDFView/Open
Show full item record

SCOPUSTM   
Citations

41
checked on Feb 26, 2024

WEB OF SCIENCETM
Citations

42
checked on Mar 2, 2024

Page view(s) 50

522
checked on Mar 26, 2024

Download(s) 50

945
checked on Mar 26, 2024

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.