2007 Annual Monitoring Report (pdf 16MB) - Bolsa Chica Lowlands ...
2007 Annual Monitoring Report (pdf 16MB) - Bolsa Chica Lowlands ... 2007 Annual Monitoring Report (pdf 16MB) - Bolsa Chica Lowlands ...
Western Snowy Plover Nesting at Bolsa Chica, 2007 December 2007Figure 4. Biweekly Nest Initiation, Hatching, & LossTable 2. Males, Females, Nests and Fledgling Production 1997-2007Year Females MalesTotalTotal % ChickFledglingsNestsFledge/Nest SurvivalFl/Male2007 18 12 50 25 0.50 19.2 2.12006 27 35 71 64 0.90 38.5 1.82005 25 41 51 75 1.47 65.2 1.82004 25 20 65 79 1.22 53.0 4.02003 15 16 32 44 1.38 57.9 2.82002 19 20 50 27 0.54 36.0 1.42001 19 18 55 57 1.04 90.5 3.22000 15 16 39 42 1.08 85.4 2.61999 12 11 38 23 0.61 32.4 2.11998 11 16 34 25 0.74 37.3 1.61997 14 20 30 nd nd nd ndFl = fledglings, nd = not determinedMerkel & Associates, Inc. 10
Western Snowy Plover Nesting at Bolsa Chica, 2007 December 2007Figure 5. Comparison of Number of Hatched Nests, Failed Nests, and Fledglings 1997-2007.Several factors may have contributed to the low production of fledglings in 2007. The most likelycause would be predation on chicks, discussed more below. Of 21 chicks produced on NS3, allmoved off the nest site top to other locations. And of 50 chicks produced on NSI only 2 were knownto have left the site. Food shortages that may have caused chick loss in 2006, especially on NS1,were not evident in 2007. In the 2007 breeding season, NS1 received full tidal influence, whichshould have increased the prey base of insects and invertebrates. Currently, no method of assessingthe adequacy of the prey base for snowy plover chick survival has been developed for Bolsa Chica.Brood movement out of an area is a symptom of a problem. However, broods may be relocatingbecause the adult is evading a potential predator, been the loser in a brood territory dispute, orbecause there is no food available for chicks. A disease that causes chick death but not illness inadults seems improbable.In this study, when one or more eggs of a clutch hatch, days are allowed to pass before any egg(s)that may have been abandoned are collected. No apparently abandoned eggs have been seen tohatch.Merkel & Associates, Inc. 11
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Western Snowy Plover Nesting at <strong>Bolsa</strong> <strong>Chica</strong>, <strong>2007</strong> December <strong>2007</strong>Figure 4. Biweekly Nest Initiation, Hatching, & LossTable 2. Males, Females, Nests and Fledgling Production 1997-<strong>2007</strong>Year Females MalesTotalTotal % ChickFledglingsNestsFledge/Nest SurvivalFl/Male<strong>2007</strong> 18 12 50 25 0.50 19.2 2.12006 27 35 71 64 0.90 38.5 1.82005 25 41 51 75 1.47 65.2 1.82004 25 20 65 79 1.22 53.0 4.02003 15 16 32 44 1.38 57.9 2.82002 19 20 50 27 0.54 36.0 1.42001 19 18 55 57 1.04 90.5 3.22000 15 16 39 42 1.08 85.4 2.61999 12 11 38 23 0.61 32.4 2.11998 11 16 34 25 0.74 37.3 1.61997 14 20 30 nd nd nd ndFl = fledglings, nd = not determinedMerkel & Associates, Inc. 10
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