Question: why is the greatest number of species found in the ecotone
[{'answer': 'the edge effect', 'provenance': [{'wikipedia_id': '460983', 'title': 'Ecotone', 'start_paragraph_id': 9, 'start_character': 658, 'end_paragraph_id': 9, 'end_character': 673, 'bleu_score': 1.0, 'section': 'Section::::Formation.\n'}]}, {'provenance': [{'wikipedia_id': '460983', 'title': 'Ecotone', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 781, 'bleu_score': 0.984188478234951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17723285969539880949}, 'section': 'Section::::Formation.\n'}]}]