Nest characteristics of the Clapper Rail in coastal Georgia

نویسندگان

  • Karen F. Gaines
  • James C. Cumbee
  • Warren L. Stephens
  • James C. Cumbee
چکیده

The nesting habitat of the Clapper Rail (Rallus longirostris) is not well studied in the southeastern United States. We documented Clapper Rail nest characteristics and surrounding habitats near Brunswick on the Georgia coast. Of 159 nests found, only 29 were active. Although some nests may have been abandoned or never used, many could have been depredated. Nests were constructed farther away from tidal influences than in those populations studied in the mid-Atlantic region of the United States. Clapper Rails also tended to nest near tidal pools as frequently as tidal creeks, contrasting with other Atlantic coast studies. The greater tidal amplitude of Brunswick as compared to the mid-Atlantic coast may explain this finding. Tidal-creek nests were found farther away from, and were associated with taller vegetation near the banks of, a water source than tidal-pool nests. While nest placement differed based on habitat characteristics in this study, nest-structure morphometrics were similar between tidal-creek and tidal-pool habitats and were consistent with those found in other regions of the country. SINOPSIS. Caracterı́sticas de los nidos de Rallus longirostris en la costa de Georgia El habitat de anidamiento de Rallus longirostris no ha sido bien estudiado en el sureste de los Estados Unidos. Documentamos las caracteı́sticas del habitat de anidamiento y de los alrededores de esta especie en Brunswich, Georgia. De 159 nidos encontrados solo 29 estaban activos. Aunque algunos de estos nidos muy bien pudieron ser abandonados o nunca utilizados, muchos de estos pudieron haber sido depredados. Los nidos fueron constuidos más lejos del efecto de las mareas que los estudiados en la región media del Atlántico. Las aves tendieron a anidar cerca de charcas formadas por las mareas y de arroyos también formados por esta, lo que contrasta con los estudios hechos en el Atlántico. La mayor amplitud de las mareas en Bruanswick muy bien pudieran ser la causa de las diferencias. Los nidos en arroyos formados por las mareas se encontraron más lejos y estuvieron asociados con vegetación de mayor altura que quellos encontrados en las charcas de mareas. Aunque la localización del nido vaió con el habitat, la morfometrı́a estructural del nido resultó similar en ambos habitats y con otros encontrados en otras regiones del pais.

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تاریخ انتشار 2017