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Figure 1 | BMC Evolutionary Biology

Figure 1

From: Tracing early stages of species differentiation: Ecological, morphological and genetic divergence of Galápagos sea lion populations

Figure 1

Map of Galápagos sea lion (Zalophus wollebaeki) rookeries sampled across the Galápagos archipelago. Dot size reflects the number of sampled individuals. Sampling locations are generally labelled by a two-letter code. Where rookeries have been pooled due to sample size limitations they are encoded with four letters. Rookeries of the Galápagos fur seal (Arctocephalus galapagoensis) are indicated by the prefix Ag. Diamonds symbolize the average chlorophyll a concentration from 1998–2007 SeaWiFS satellite data indicative for the nutrient level of a given location (symbol size scales linearly with chl a concentration ranging from 0.216–6.339 mg/m3). For details of sampling locations and sample sizes for mtDNA marker, 22 nuclear microsatellites markers and stable isotope analysis see Table 1.

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