Feeding ecology of Phalloceros anisophallos (Osteichthyes: Cyprinodontiformes) from Andorinha Stream, Ilha Grande, Brazil

In the present work, we determined the relative importance of allochthonous and autochthonous food items as well as seasonal and ontogenetic variation in the feeding habits of Phalloceros anisophallos from corrego Andorinha, Ilha Grande. Quantitative analysis, based on alimentary index (IAi) and food volume (Vo), revealed that P. anisophallos fed on detritus, autochthonous algae (diatoms, unicellular and filamentous Chlorophyceae algae), autochthonous animals (aquatic insect larvae: Trichoptera, Chironomidae and other Diptera) and allochthonous animals (terrestrial insects: Hymenoptera). Ontogenetic variations were recorded for the consumption of each food category. Adults used a larger amount of algae and detritus, and juveniles used a higher amount of animal items. Significant differences in intestinal coefficient between adult and juvenile individuals corroborated the ontogenetic differences in feeding behavior. IAi values of each consumed food category did not vary between the rainy and dry seasons, but mean detritus Vo differed between seasons and was significantly (Anova, p<0.01) greater during the dry season.

• Publication year

  2010

• Venue

  Neotropical Entomology

• Publication date

  2010-03-01

• Fields of study

  Biology, Environmental Science

• Identifiers
  DOI 10.1590/S1679-62252010000100021
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• The diet of P. anisophallos included detritus, autochthonous algae (diatoms, unicellular and filamentous Chlorophyceae), autochthonous animals (aquatic insect larvae: Trichoptera, Chironomidae, and other Diptera), and allochthonous animals (terrestrial insects: Hymenoptera).

  Confidence 0.95

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review
• IAi values of each consumed food category did not vary between rainy and dry seasons, but mean detritus volume was significantly greater during the dry season (ANOVA, p<0.01).

  Confidence 0.90

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review
• Adults of Phalloceros anisophallos consumed larger amounts of algae and detritus, while juveniles consumed higher amounts of animal items, with significant differences in intestinal coefficient corroborating the ontogenetic differences in feeding behavior.

  Confidence 0.95

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review

• alimentary index

  method, metric

  A quantitative measure (IAi) used to assess the relative importance of different food items in the diet.

  Aliases: IAi

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review
• allochthonous animals

  food item

  Animals originating from outside the stream environment, such as terrestrial insects including Hymenoptera.

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review
• autochthonous algae

  food item

  Algae originating within the stream, including diatoms, unicellular and filamentous Chlorophyceae.

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review
• autochthonous animals

  food item

  Aquatic animals originating within the stream, primarily insect larvae of Trichoptera, Chironomidae, and other Diptera.

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review
• detritus

  food item

  A non-living organic matter food item consumed by P. anisophallos in the stream.

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review
• intestinal coefficient

  metric

  A morphological measure of the digestive tract used to compare dietary adaptations between life stages.

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review
• ontogenetic variation

  phenomenon

  Differences in feeding behavior and diet composition between juvenile and adult life stages of P. anisophallos.

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review
• phalloceros anisophallos

  organism

  A freshwater fish species of the family Poeciliidae inhabiting Córrego Andorinha, Ilha Grande, Brazil.

  Aliases: P. anisophallos

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review
• seasonal variation

  phenomenon

  Differences in diet-related measures between the rainy and dry seasons in the stream habitat.

  All you need is Python (5d7gwfm5zu) extraction뀨 (7c402c1b98) reviewq (76h6bfydm6) review

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