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Amphipod intersex, metals and latitude: a perspective
M Ramiro Pastorinho1, Trevor C Telfer, Amadeu M V M Soares
11-Center for Environmental and Marine Studies (CESAM) and Department of Biology, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal. rpastorinho@ua.pt
This study investigated intersexuality in Echinogammarus marinus across a latitudinal gradient. While metal levels were similar, results suggest metals may play a role in causing intersex conditions in this crustacean species.
Area of Science:
- Environmental toxicology
- Marine biology
- Crustacean endocrinology
Background:
- Intersexuality is observed in crustaceans, with pollution implicated.
- A direct mechanistic link between metals and intersex has not been established.
- Latitudinal studies on invertebrate intersex incidence are lacking.
Purpose of the Study:
- To investigate intersex incidence in Echinogammarus marinus across a latitudinal gradient.
- To explore the potential role of metals in causing intersexuality.
- To assess fecundity loss in intersex females.
Main Methods:
- Sampling of three Echinogammarus marinus populations (Iceland, Scotland, Portugal).
- Analysis of water, biota, and sediment for metal levels.
- Assessment of intersex prevalence and fecundity in females.
Main Results:
- Intersex females in Iceland exhibited the highest fecundity loss.
- Specific morphological abnormalities were noted in Scottish samples.
- Metal concentrations were comparable across locations, with no significant difference in intersex prevalence.
Conclusions:
- An unequivocal relationship between metal presence and intersex induction was not proven.
- Results support the potential role of metals as a direct cause of intersexuality in Echinogammarus marinus.
- Further research is needed to elucidate the precise mechanisms.
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