Reproductive biology of subalpin endemic Minuartia nifensis Mc Neill (Caryophyllaceae) from West Anatolia, Turkey
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Tarih
2008
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info:eu-repo/semantics/openAccess
Özet
Minuartia nifensis Mc Neill (Caryophyllaceae)’in, 2002-2004 yılları arasında gerçekleştirilen çalışma ile bu türün sınırlı yayılış nedenleri belirlenmeye çalışılmış, bu amaçla bitkilerin yaşadıkları çevre koşulları ile üreme biyolojileri araştırılmıştır. M. nifensis Mc Neill (Caryophyllaceae), Türkiye Flora’sında Nif Dağı’ndaki tek lokaliteden kaydedilmiştir. Arazi çalışmaları sonucunda, ilk lokalitenin yaklaşık 1 km güney batısında yeni bir lokalite tanımlanmıştır. GIS ve örnekleme metodları kullanılarak, bu türün yayılış alanı 1.2 $km^2$ ve alanda bulunan birey sayısı 3308 olarak hesaplanmıştır. Bu tür IUCN (1994) kriterlerine göre hassas olarak belirlenmiştir. Çalışmalarımız sonucunda tür, IUCN (2001) kriterlerine göre Kritik Tehlike altında (CR) B2ab(ii)+(iii) olarak önerilmiştir. Ayrıca, ilk defa olarak bu türün hermafrodit ve disi çiçekli bireylerinin olduğu saptanmıştır. Araştırma sırasında elde edilen veriler, hermafrodit bireylerin kendikendine veya böcekle disi bireylerinse sadece böcekle tozlastığını göstermiştir. Tozlaşma denemeleri ayrıca, tüm çiçeklerin potansiyel olarak tohum oluşturabileceğini göstermiş ve sporogenez, tozlaşma ve zigot sonrası dönemde herhangi bir olumsuzluğun olusmadığını göstermiştir. Tohum/ ovül oranı (hermafrodit çiçeklerde 24% ve disi çiçeklerde 17%) ve üreme başarısı düşük bulunmuş, bunun da doğada anterler ve stigmalar arasındaki yetersiz polen transferine dayandığı düşünülmüştür.
Reproductive biology of Minuartia nifensis Mc Neill (Caryophyllaceae), was investigated from 2001 to 2004 to determine the reasons for the restricted distribution of this endemic species, to that end, the environmental conditions and the reproductive biology were studied. In Flora of Turkey records, the entry for M. nifensis includes just one locality on the Nif mountain. As a result of field investigations, we found another locality, approximately 1 km to the southwest of the first one. Using GIS and sampling methods, these two localities together form an area of 1.2 $km^2$ and the number of individuals in all two localities was recorded as 3308. This species had been declared as endangered according to IUCN (1994) categories. Our studies led us to reccomend it as Critically Endangered (CR) B2ab(ii)+(iii) according to the IUCN (2001) categories. Moreover, for the first time, it was found in this study that this species also contains a hermafrodit flower and a female flower. The observations gathered in this study justify the fact that, the hermaphrodite individuals are self or insect pollinated and the female individuals are insect pollinated only. Pollination experiments also showed that all flowers are potentially able to develop fruits throughout the flowering period, suggesting that no abberation occurs in sporogenesis, fertilization or postzygote processes. However, calculated seed/ovule ratio was low (24% in hermaphrodite flowers and 17% in female flowers) and low reproductive success in the field should be attributed to insufficient pollen transfer between anthers and stigmas.
Reproductive biology of Minuartia nifensis Mc Neill (Caryophyllaceae), was investigated from 2001 to 2004 to determine the reasons for the restricted distribution of this endemic species, to that end, the environmental conditions and the reproductive biology were studied. In Flora of Turkey records, the entry for M. nifensis includes just one locality on the Nif mountain. As a result of field investigations, we found another locality, approximately 1 km to the southwest of the first one. Using GIS and sampling methods, these two localities together form an area of 1.2 $km^2$ and the number of individuals in all two localities was recorded as 3308. This species had been declared as endangered according to IUCN (1994) categories. Our studies led us to reccomend it as Critically Endangered (CR) B2ab(ii)+(iii) according to the IUCN (2001) categories. Moreover, for the first time, it was found in this study that this species also contains a hermafrodit flower and a female flower. The observations gathered in this study justify the fact that, the hermaphrodite individuals are self or insect pollinated and the female individuals are insect pollinated only. Pollination experiments also showed that all flowers are potentially able to develop fruits throughout the flowering period, suggesting that no abberation occurs in sporogenesis, fertilization or postzygote processes. However, calculated seed/ovule ratio was low (24% in hermaphrodite flowers and 17% in female flowers) and low reproductive success in the field should be attributed to insufficient pollen transfer between anthers and stigmas.
Açıklama
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Biyoloji
Kaynak
Biological Diversity and Conservation
WoS Q Değeri
Scopus Q Değeri
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1
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