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Abstract - Issue Nov 2017, 38 (6) Back
nstantaneous and historical temperature effects on a-pinene
behaviour of larval Ambystoma granulosum
Sarma1*, A. E. Fuentes-Barradas1, S. Nandini1
and D.J. Chaparro-Herrera2
Aquatic Zoology, National Autonomous University of Mexico, Campus Iztacala,
Av. de Los Barrios No.1,
AP 314, 54090, Los
Reyes, Tlalnepantla, State of Mexico, Mexico
Microbiología Ambiental. UIICSE, UNAM-FES Iztacala, Av. de Los Barrios, No.
1, Los Reyes,
Méx., CP 54090, Mexico
Author E-mail: email@example.com
Paper received : 20.12.2016
Revised received : 11.01.2017
Re-revised received :
Accepted : 03.07.2017
Aim: Food availability
during the early developmental stages of larval salamanders is a bottleneck
for their successful breeding strategies and the conservation of amphibians.
Zooplankton based diets allow salamander larvae to choose different prey
types based on their size and energy gains. In this study, we quantified the
patterns of prey selection and functional responses of Ambystoma
granulosum during the larval stages (1 to 8 weeks).
the prey selection experiment, we offered a mixture of five crustacean zooplankton
(Alona glabra, Ceriodaphnia dubia, Heterocypris incongruens, Simocephalus
vetulus and Daphnia pulex). A. glabra, C. dubia and H.
incongruens were used as prey for the functional response experiments.
was a direct and linear correlation between the larval length and the gape
size during the study period. Prey selectivity by A. granulosum
indicated a shift in choice of the crustacean species, where small-bodied
items (e.g., A. glabra) were selected until the fifth week; during the
later weeks, these were replaced by the larger S. vetulus and D.
pulex. Functional response curves indicated that the pattern of prey
consumption mainly corresponded to type II. Ambystoma granulosum
offered C. dubia showed increased prey consumption with increasing larval
age. However, when fed A. glabra the consumption increased until the
sixth week but declined thereafter.
Interpretation: Studies on the feeding ecology of A.
granulosum allowed us to understand the quantity and type of prey needed
as the larvae grow. The highest prey biomass was consumed by A.granulosum
only at the highest offered prey density. Since natural availability of prey
in high levels are rare, larval A. granulosum possibly suffers from
food deficiency and this in turn may lead to high mortality during early stages.
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