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Latitudinal gradients in geographic range size have received such attention largely because of their possible implications for the mechanisms underlying spatial variation in species richness, and particularly the tendency for richness to be much greater in the tropics. Indeed, Stevens [2] argued that there may be a connection between the two. Temperate species may have larger geographic range sizes than tropical species, due to their tolerance of a broader range of environmental conditions, necessitated by greater variance in such conditions at individual sites. This could then promote higher levels of species coexistence in the tropics through a ¡®¡®mass effect¡¯¡¯ [32], whereby some of the occurrence of species is maintained by immigration of individuals into communities outside their restricted microhabitats. ÏëÎÊÒ»ÏÂ×îºóÒ»¾äÖÐmass effectÔõô·Ò룿 |
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cfk580713
ÖÁ×ðľ³æ (ÖøÃûдÊÖ)
- ·ÒëEPI: 277
- Ó¦Öú: 30 (СѧÉú)
- ¹ó±ö: 0.038
- ½ð±Ò: 13605.1
- É¢½ð: 123
- ºì»¨: 6
- Ìû×Ó: 1259
- ÔÚÏß: 826.9Сʱ
- ³æºÅ: 253096
- ×¢²á: 2006-05-20
- ÐÔ±ð: GG
- רҵ: Óлú¸ß·Ö×Ó¹¦ÄܲÄÁÏ
2Â¥2010-11-02 18:05:13
eaglesea2008
ľ³æ (ÕýʽдÊÖ)
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ½ð±Ò: 2971.1
- É¢½ð: 143
- ºì»¨: 3
- Ìû×Ó: 979
- ÔÚÏß: 100.7Сʱ
- ³æºÅ: 515689
- ×¢²á: 2008-03-01
- רҵ: Ò£¸Ð»úÀíÓë·½·¨

3Â¥2010-11-02 18:09:12
cfk580713
ÖÁ×ðľ³æ (ÖøÃûдÊÖ)
- ·ÒëEPI: 277
- Ó¦Öú: 30 (СѧÉú)
- ¹ó±ö: 0.038
- ½ð±Ò: 13605.1
- É¢½ð: 123
- ºì»¨: 6
- Ìû×Ó: 1259
- ÔÚÏß: 826.9Сʱ
- ³æºÅ: 253096
- ×¢²á: 2006-05-20
- ÐÔ±ð: GG
- רҵ: Óлú¸ß·Ö×Ó¹¦ÄܲÄÁÏ
4Â¥2010-11-02 19:00:11
petrocatal
ľ³æ (ÕýʽдÊÖ)
- ·ÒëEPI: 134
- Ó¦Öú: 23 (СѧÉú)
- ¹ó±ö: 0.01
- ½ð±Ò: 3436.6
- ºì»¨: 1
- Ìû×Ó: 959
- ÔÚÏß: 299.5Сʱ
- ³æºÅ: 557856
- ×¢²á: 2008-05-13
- ÐÔ±ð: GG
- רҵ: Óлú»¯¹¤

5Â¥2010-11-02 20:45:19
yhzhu75
½ð³æ (ÕýʽдÊÖ)
- ·ÒëEPI: 76
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ¹ó±ö: 0.005
- ½ð±Ò: 1183.8
- Ìû×Ó: 385
- ÔÚÏß: 119.1Сʱ
- ³æºÅ: 802006
- ×¢²á: 2009-07-01
6Â¥2010-11-03 12:34:10













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