Factors affecting methylmercury biomagnification by a widespread aquatic invertebrate predator, the phantom midge larvae Chaoborus
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منابع مشابه
Factors affecting methylmercury biomagnification by a widespread aquatic invertebrate predator, the phantom midge larvae Chaoborus.
MeHg biomagnification by the phantom midge Chaoborus in relation to MeHg concentrations in their prey and its migratory behavior was investigated in two Canadian Precambrian Shield lakes. Three Chaoborus species with contrasted migratory behavior were collected in a fishless and a fish-inhabited lake. All species accumulated MeHg through their ontogenic development. In the lake inhabited by fis...
متن کاملRapid swimming and escape movements in the aquatic larvae and pupae of the phantom midge Chaoborus crystallinus.
Rapid locomotion in the aquatic larvae and pupae of the phantom midge Chaoborus crystallinus was analysed. A 10-mm long larva moved sporadically by rapidly curling into a tight circle and then unfurling. The most common movement (70% of all movements) was a body rotation of 332±22 deg (mean ± s.d.) that lasted 63±19 ms and reached a peak velocity of 0.07±0.02 m s(-1). If the head unfurled earli...
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Animals frequently undergo periods when they accumulate lipid reserves for subsequent energetically expensive activities, such as migration or breeding. During such periods, daily lipid-reserve dynamics (DLD) of sentinel species can quantify how landscape modifications affect function, health, and resilience of ecosystems. Aythya affinis (Eyton 1838; lesser scaup; diving duck) are macroinverteb...
متن کاملCompetition between protons and cadmium ions in the planktonic food chain leading to the phantom midge Chaoborus
Cadmium concentrations in the phantom midge Chaoborus can be related to those of the free Cd ion, Cd21, in lakewater provided that the competitive influence of H on Cd uptake sites is considered. Because this predator takes up its Cd from plankton, competition between H and Cd21 ions could take place at several levels in the food chain to which this insect belongs. To identify at which trophic ...
متن کاملChaoborus and Gasterosteus Anti-Predator Responses in Daphnia pulex Are Mediated by Independent Cholinergic and Gabaergic Neuronal Signals
Many prey species evolved inducible defense strategies that protect effectively against predation threats. Especially the crustacean Daphnia emerged as a model system for studying the ecology and evolution of inducible defenses. Daphnia pulex e.g. shows different phenotypic adaptations against vertebrate and invertebrate predators. In response to the invertebrate phantom midge larvae Chaoborus ...
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ژورنال
عنوان ژورنال: Environmental Pollution
سال: 2012
ISSN: 0269-7491
DOI: 10.1016/j.envpol.2012.02.003