Abstract:Non-systematically collected, a.k.a. opportunistic, species observations are accumulating at a high rate in biodiversity databases. Occupancy models have arisen as the main tool to reduce effects of limited knowledge about effort in analyses of opportunistic data. These models are generally using long closure periods (e.g. breeding season) for the estimation of probability of detection and occurrence. Here we use the fact that multiple opportunistic observations in biodiversity databases may be available even … Show more
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