What is the hypothesis that huber were testing in this study? NAME: Diwa cnoudha

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What is the hypothesis that huber were testing in this study? NAME: Diwa cnoudhary 810 IC634 Disruptive evolution and speciation in Geospiza fortis case study based on Huber, S. K.. De Leon, L. F., Hendry. A. P., Bermingham, E., & Podos, J. (2007) Reproductive isolation of sympatric morphs in a population of Darwin's nches. Proc Roy Soc B, 274, 1709-1714 Step 1: Concept map the study ecall that in Video Lecture 2-3 Modes of Selection, I mentioned a population of Darwin's finches that had two morphs of birds-big and are going to discuss this ah Huber and coworkers. Read the small beaked. We population further today by considering a paper questions being asked and the study system being used to answer those questions stages of adaptive diversification (Smith 1993; Smith & Skulason 1996; Orr&Smith; 1998; ntroduction to this paper (below) and, in your groups, develop a concept map outlining the Bimodal populations, although rare, provide outstanding opportunities to study the early 999; Rundle & Nosil 2005). We have recently described a bimodal population of the medium ground finch (Geospiza fortis) at El Garrapatero on Santa Cruz Island, Galápagos Ecuador (igure 1). This population features birds that fall mainly into large and small beak size morphs, with relatively few intermediates, a pattern that has been confirmed statistic (Hendry et al.2006; Huber& Podos 2006). If other G. fortis populations are any guide (Price 1987: Grant 1999: Keller et al. 2001; Grant & Grant 2006), this variation has a strong additive genetic basis and reflects selection imposed by variation in the size and hardness of seeds. The bimodality has almost certainly arisen owing to specialization by the two morphs on differen food types, perhaps coupled with intra- or interspecific competition, and reflecting processes thought to have driven the adaptive radiation as a whole (Lack 1947: B Grant 1981: hluter 2000; Grant& Grant 2002; Herrel et al.2005). Moreover, the structure of vocal mating presence of ecologically driven bimodality in beak size, coupled with divergence in mating we investigate here. signals (songs) of males at El Garrapatero differs between the morphs in acoustic parameters that correspond to differences in beak size and vocal performance (Huber & Podos 2006). The signals, suggests that this population might be in an early stage of speciation, a possibility that We examined three factors that may influence incipient ecological speciation in E Garrapatero G. fortis: the strength of assortative pairing: the persistence of assortative pairing: the persistence of assortative pairing over time and across variable ecological conditions; and levels of gene flow between the m Our study focused on breeding pairs of G. fortis during 2004-2006. Climatic conditions vari widely during these years, which allowed us to test for the strength and stability of assortative pairing under variable ecological conditions. Virtually no rain fell in 2004 and in the first two 2006. Climatic conditions varied rant & months of 2005, making this the most extreme drought in the 40-year period of record (G Grant 2006). Some breeding occurred during this period but at a low rate. Heavy rains fell in March 2005, and the number of breeding pairs increased considerably. More typical rainfall prevailed in 2006. Step 2: State the overall hypothesis being tested in this paper Ina your concept map come up ith a statement f the hypothesis that Huber and co

Explanation / Answer

In this study, the hypothesis states that the bimodal population of finch might be at the early stage of speciation, which might be driven by the ecological factors reflected in divergene in mating signals and beak size. Huber were going to test the factors influencing ecological speciation in EI Garrapatero G. fortis in terms of the stregth and persistance of assortative pairing over various ecological conditions.

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