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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
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Contrasting biological features in morphologically cryptic Mediterranean sponges.

Leire Garate1, Andrea Blanquer1, Maria J Uriz1

  • 1Department of Marine Ecology, Centre d'Estudis Avançats de Blanes (CEAB-CSIC), Blanes, Girona, Spain.

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Summary

Cryptic marine sponges exhibit distinct survival and growth patterns. Differentiating these species is crucial for accurate ecological assessments and biodiversity studies in shared habitats.

Keywords:
FissionsFusionsGrowthHemimycale columellaHemimycale mediterraneaLife spanMediterranean seaSpongesSurvival

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Area of Science:

  • Marine Biology
  • Ecology
  • Biodiversity

Background:

  • Sponges are vital to marine ecosystems, influencing niche creation, resource competition, and nutrient cycling.
  • Morphologically similar cryptic sponge species can lead to underestimation of marine biodiversity.
  • Understanding the ecological roles of cryptic species is essential for accurate ecological assessments.

Purpose of the Study:

  • To investigate the growth, survival, fusion, and fission dynamics of two cryptic sponge species: *Hemimycale mediterranea* and *H. columella*.
  • To identify potential correlations between environmental factors and the distribution and population dynamics of these cryptic species.

Main Methods:

  • Monthly photographic monitoring of sponge growth, fusions, and fissions over two years.
  • Collection of seawater samples to characterize environmental factors in species habitats.
  • Statistical analysis to correlate environmental data with observed sponge population dynamics.

Main Results:

  • *H. mediterranea* exhibited complete disappearance post-larval release, contrasting with 64% survival for *H. columella* over two years.
  • Fusion and fission events differed significantly, occurring year-round in *H. mediterranea* but seasonally (cold months) in *H. columella*.
  • No environmental factors correlated with *H. mediterranea* growth; temperature and dissolved organic nitrogen negatively impacted *H. columella* growth.

Conclusions:

  • Significant differences in survival, growth, and reproductive strategies exist between these cryptic sponge species.
  • Environmental factors, particularly temperature and dissolved organic nitrogen, influence *H. columella* population dynamics.
  • Distinguishing cryptic species is vital for accurate ecological studies, especially when they co-occur geographically.