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Figure 2 in Multiple broods of the jumping spider Asemonea tenuipes (Araneae: Salticidae: Asemoneinae)

Figure 2. Multiple broods of a second female Asemonea tenuipes, in a different nest. 1, Female at center between her first, emergent brood and a second group of 22 eggs. Note how her position between these broods allows free access to the two entrances at either end of the nest (top and bottom of each photograph). 2, Eight days later, and most spiderlings of the first brood (at right) have molted into the free-living second instar stage, as shown by the presence of exuviae. The second brood, at left, has hatched, and this female has deposited a third brood of about 17 eggs between the other broods.

Figure 3 in Multiple broods of the jumping spider Asemonea tenuipes (Araneae: Salticidae: Asemoneinae)

Figure 3. Multiple broods of a third female Asemonea tenuipes in a different nest. Members of the first brood (at left) already have well-developed eyes, and the 14 eggs of the second brood are ready to hatch. Note the presence of this well-fed female outside of her nest with captured prey (a brachyceran fly). Also note the multiple entrances at either side of this nest (top and bottom of the photograph), and a clear space for the female to move between these between her broods.

Figure 1 in Multiple broods of the jumping spider Asemonea tenuipes (Araneae: Salticidae: Asemoneinae)

Figure 1 (continued from previous page). Multiple broods of a female Asemonea tenuipes, in a single nest. 3, Same female with the 20 emergent spiderlings from her first brood, and a second brood of 19 eggs deposited in two continguous rows. 4, Nine days later, the same female was once again gravid, after the departure of the first brood. At least 14 emergent instars from the second brood are visible. 5, Three days later, the female has deposited a third brood of 17 eggs near the first one, and about 10 spiderlings from the second brood can still be seen. 6, Ten days later, and only emergent instars of the third brood can be seen. All photographs in Figures 1-3 were taken by the senior author (PJ) in his backyard next to the Sanjay Gandhi National Park in Mumbai, Maharashta, India (19°13'59.6"N 72°51'52.5"E).

Figure 1 in Multiple broods of the jumping spider Asemonea tenuipes (Araneae: Salticidae: Asemoneinae)

Figure 1 (continued on next page). Multiple broods of a female Asemonea tenuipes, in a single nest. 1, Female attending to the 20 eggs of her first brood. 2, Same female, now gravid, with 20 emergent first instars from her first brood eight days later.

opencc-zeroDec 2017View details →

Data from: Genetic signatures through space, time and multiple disturbances in a ubiquitous brooding coral

The predominance of self-recruitment in many reef-building corals has fundamental and complex consequences for their genetic diversity, population persistence and responses to climate change. Knowledge of genetic structure over local scales needs to be placed within a broad spatial context, and also integrated with genetic monitoring through time to disentangle these consequences. Here, we examined patterns of genetic diversity over multiple spatio-temporal scales across tropical Australia in the ubiquitous brooding coral, Seriatopora hystrix. We also analysed complimentary environmental and demographic data to elucidate the seascape drivers of these patterns. Large genetic differences was detected between the east versus west coasts of Australia. In northwest Australia, geographic differentiation dominated genetic structure over multiple scales. However, three sympatric lineages were detected at the largest offshore reef system (Scott Reef). Similar to the differences observed among putative species in eastern Australia, these lineages were associated with different levels of wave exposure. Local genetic structure within the Scott Reef system was relatively stable over ten years, but temporal differences were observed that reflected small but important genetic changes over a few generations during recovery after severe bleaching. These results highlight the importance of self-recruitment together with occasional longer distance connectivity for the persistence of a metapopulation across spatially and temporally variable environments. Our multidimensional research provides a foundation for further long-term genetic monitoring to inform conservation strategies and highlights that sampling scales, ecological effects and cryptic diversity are important considerations to develop realistic understanding of the evolutionary resilience of corals.

opencc-zeroDec 2010View details →

Data from: Multiple scales of genetic connectivity in a brooding coral on isolated reefs following catastrophic bleaching

Understanding the pattern of connectivity among populations is crucial for the development of realistic and spatially explicit population models in marine systems. Here we analysed variation at eight microsatellite loci to assess the genetic structure and to infer patterns of larval dispersal for a brooding coral, Seriatopora hystrix, at an isolated system of reefs in northern Western Australia. Spatial autocorrelation analyses show that populations are locally subdivided, and that the majority of larvae recruit to within 100 m of their natal colony. Further, a combination of F- and R- statistics showed significant differentiation at larger spatial scales (2–60 km) between sites, and this pattern was clearly not associated with distance. However, Bayesian analysis demonstrated that recruitment has been supplemented by less frequent but recent input of larvae from outside the local area; 2–6% of colonies were excluded from the site at which they were sampled. Individual assignments of these migrants to the most likely populations suggest that the majority of migrants were produced at the only site that was not decimated by a recent and catastrophic coral bleaching event. Furthermore, the only site that recovered to prebleaching levels received most of these immigrants. We conclude that the genetic structure of this brooding coral reflects its highly opportunistic life history, in which prolific, philopatric recruitment is occasionally supplemented by exogenously produced larvae.

publicNov 2011View details →

Data from: Multiple scales of genetic connectivity in a brooding coral on isolated reefs following catastrophic bleaching

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