Declining abundance of beaked whales (family Ziphiidae) in the California Current large marine ecosystem.

PLoS One · 2013 · PMC3547055 · PMID 23341907

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an increasing trendno p-value reported

One possible explanation for this is that, since observing conditions coincidentally worsened with each survey, there was an increasing trend in the number of sighted groups that could not be identified to genus.

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