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High altitude copepods Diaptomus shoshone and D. coloradensis coexist due to temporal and morphological differences. Size and feeding appendage morphology explain dietary variations, enabling their survival in shared habitats.

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Area of Science:

  • Ecology
  • Zoology
  • Limnology

Background:

  • High altitude lakes harbor diverse zooplankton communities.
  • Calanoid copepods are key components of freshwater ecosystems.
  • Interspecific competition can influence species coexistence.

Purpose of the Study:

  • To investigate the ecological interactions between two high altitude calanoid copepod species, Diaptomus shoshone and D. coloradensis.
  • To determine the factors contributing to the coexistence of these ecologically similar species.
  • To understand the role of size, development timing, and feeding morphology in resource partitioning.

Main Methods:

  • Comparative analysis of body size and developmental timing between D. shoshone and D. coloradensis.
  • Gut content analysis of copepodids and adults to assess dietary overlap and food particle size selection.
  • Morphological examination of feeding appendages to correlate with dietary observations.

Main Results:

  • Diaptomus shoshone is approximately twice the size of D. coloradensis.
  • D. shoshone exhibits earlier maturation (2-3 weeks) compared to D. coloradensis.
  • Gut analyses revealed D. shoshone consumes larger food particles, while early D. shoshone copepodids consume particles similar to adult D. coloradensis.
  • Morphological differences in feeding appendages were observed and partially explain dietary partitioning.

Conclusions:

  • Coexistence of D. shoshone and D. coloradensis is facilitated by temporal (developmental timing) and morphological (feeding appendages) differences.
  • While size differences exist, they appear less critical for coexistence than feeding morphology and potentially behavioral adaptations.
  • Resource partitioning, driven by morphological and temporal niche differentiation, allows these species to co-occur in high altitude environments.