Post on 21-May-2015
Diversity and community structure of harpacticoid copepodsassociated with cold-water coral substrates in the Porcupine Seabight (North-East Atlantic)
Adapted from: Hendrik Gheerardyn et al. (2010)
Presented by:Fiddy Semba prasetiya
Lay out of the presentation
Introduction
Objectives
Methods
Results & Discussions
Conclussions
Introduction
Coral reeef as one of important coastal resources
High bio-diversity within the dead and mixed live and dead coral (Freiwald 2002)
Association between metazoan meiofauna and nematofauna , and L. pertusa
Harpacticoid copepods in deep-sea meiobenthos?
Lophelia pertusa
Aphrocallistes
Objective and Hypothesis
To investigate the associated harpacticoids copepods on the L. pertusa reef degradation zones
Is the total species (γ) diversity is higher in the coral degradation zone than in the surrounding soft-bottom deep sea?Total diversity (γ), can be partitioned into:
Average diversity within samples (α) Average diversity among samples (β)
β -diversity is subdivided into: Diversity due to differences in microhabitat (β1) Diversity due to differences in sampling site (β2)
Study area & Sampling procedure
Methods
Results
Harpacticoida made up the bulk of the specimens (>90%)Other copepods are: Calanoida, Misophrioida,
Siphonostomatoida & Cyclopoida
Total number of Copepoda Harpacticoida, harpacticoid adults, number species in each sample
Results860 adult harpacticoids, yielded:
157 species, 62 genera & 19 families No significance difference in
relative abundance among coral & sediment samples (ANOVA, p<0.05)
Pseudotachidiidae were higher on sponge skeletons
Ectinosomatidae were dominant in sediment & coral samples
Pseudomesochra, Halophytophilus, Sigmatidium (also Ameira and Pseudobradya) (5-10%) (cor. & sed.)
Pseudomesochra and Ameira (31 & 12%) (spo.)
Results
Defined community structure (coral & sediment samples)ANOSIM was only significant
for sediment-coral (p=0.004, R=0.231)
High average dissimilarity infauna & epifauna (82.1%)
But low similarity within epifauna samples (36.9%) & sediment (10.2%)
Multidimensional scaling (MDS) two-dimensional ordination plot
Results
Sediment had the highest diversity (rarefaction curve)
Dominance in sponge samples was higher than in coral and sediment samples
Total species richness attributed to differences between sampling sites (β2=63.4%)
Discussion
Multiple corer VS boxcorerNo defined microhabitat for harpacticoid assemblages at
family level:
Difficulties in assessing total harpacticoid species diversity
Taxa Microhabitat typeSediment Coral Sponge
Pseudotachidiidae +Pseudomesochra +Tetragonicipitidae +Ameira + +Pseudobradya + +Halophytophilus lopheliae +
Conclussion
• Trends in species composition and diversity of harpacticoids in the coral degradation zone were difficult to asses
• Harpacticoid composition and diversity are not different between microhabitat
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